Analysis Options Inputs

The following inputs describe the options available in the analysis_options file. The primary sections are:

• general

• design_variables

• constraints

• merit_figure

• merit_figure_user

• inverse_design

• driver

• recorder

Of these sections, the design_variables is the most complex. The schema guide for all other sections is:

WISDEM wind turbine optimization options schema

Schema that describes the analysis and optimization options for WISDEM

WISDEM_optimization_options_schema_v00
type	object

general

type	object
properties
folder_output	Name of folder to dump output files
	type	string
	default	output
fname_output	File prefix for output files
	type	string
	default	output

constraints

Activate the constraints that are applied to a design optimization

type	object
properties
blade	Constraints associated with the blade design
	type	object
	properties
	strains_spar_cap_ss	Enforce a maximum allowable strain in the suction-side spar caps
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		max	Maximum allowable strain value
			type	number
			maximum	0.1
			minimum	1e-08
			default	0.004
		index_start	First index of the array of design variables/constraints that is optimized/constrained
			type	integer
			minimum	0
		index_end	Last index of the array of design variables/constraints that is optimized/constrained
			type	integer
			minimum	0
			default	8
	strains_spar_cap_ps	Enforce a maximum allowable strain in the pressure-side spar caps
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		max	Maximum allowable strain value
			type	number
			maximum	0.1
			minimum	1e-08
			default	0.004
		index_start	First index of the array of design variables/constraints that is optimized/constrained
			type	integer
			minimum	0
		index_end	Last index of the array of design variables/constraints that is optimized/constrained
			type	integer
			minimum	0
			default	8
	strains_te_ss	Enforce a maximum allowable strain in the suction-side trailing edge reinforcements
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		max	Maximum allowable strain value
			type	number
			maximum	0.1
			minimum	1e-08
			default	0.004
		index_start	First index of the array of design variables/constraints that is optimized/constrained
			type	integer
			minimum	0
		index_end	Last index of the array of design variables/constraints that is optimized/constrained
			type	integer
			minimum	0
			default	8
	strains_te_ps	Enforce a maximum allowable strain in the pressure-side trailing edge reinforcements
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		max	Maximum allowable strain value
			type	number
			maximum	0.1
			minimum	1e-08
			default	0.004
index_start		First index of the array of design variables/constraints that is optimized/constrained
		type	integer
		minimum	0
index_end		Last index of the array of design variables/constraints that is optimized/constrained
		type	integer
		minimum	0
		default	8
tip_deflection	Enforce a maximum allowable blade tip deflection towards the tower expressed as a safety factor on the parked margin. Meaning a parked distance to the tower of 30m and a constraint value here of 1.5 would mean that 30/1.5=20m of deflection is the maximum allowable
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	margin	type	number
		maximum	10
		minimum	1
		default	1.4175
t_sc_joint	Enforce a maximum allowable spar cap thickness, expressed as the ratio of the required spar cap thickness at the joint location to the nominal spar cap thickness.
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
rail_transport	Enforce sufficient blade flexibility such that they can be transported on rail cars without exceeding maximum blade strains or derailment. User can activate either 8-axle flatcars or 4-axle
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	8_axle	Activates as a design variable or constraint
		type	boolean
	4_axle	Activates as a design variable or constraint
		type	boolean
stall	Ensuring blade angles of attacks do not approach the stall point. Margin is expressed in radians from stall.
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	margin	type	number
		maximum	0.5
		minimum	0
		default	0.05233
chord	Enforcing the maximum chord length limit at all points along blade span.
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	max	type	number
		maximum	20
		minimum	0.1
		default	4.75
root_circle_diameter	Enforcing the minimum blade root circle diameter.
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	max_ratio	Maximum ratio between the recommended root circle diameter and the actual chord at blade root. The optimizer will make sure that the ratio stays below this value.
		type	number
		maximum	10
		minimum	0.01
		default	1
frequency	Constraints on blade natural frequencies. The constraints can drive the placement of frequencies above the blade passing (3P) frequency at rated conditions using gamma_freq margin. Can be activated for blade flap and/or edge modes. Equality constraints can also be activated to target specific first and/or second flap/edge modes.
	type	object
	properties
	flap_3P	Activates as a design variable or constraint
		type	boolean
	edge_3P	Activates as a design variable or constraint
		type	boolean
	first_flap	Targeted blade natural frequency (useful for inverse design approaches)
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		target	Value of the target natural frequency
			type	number
			maximum	10
			minimum	0
		acceptable_error	Maximum offset from target, this is used to leverage inequality constraints and define the bandwidth of feasibility.
			type	number
			maximum	5
			minimum	1e-06
			default	0.01
	first_edge	Targeted blade natural frequency (useful for inverse design approaches)
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		target	Value of the target natural frequency
			type	number
			maximum	10
			minimum	0
		acceptable_error	Maximum offset from target, this is used to leverage inequality constraints and define the bandwidth of feasibility.
			type	number
			maximum	5
			minimum	1e-06
			default	0.01
	first_torsion	Targeted blade natural frequency (useful for inverse design approaches)
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		target	Value of the target natural frequency
			type	number
			maximum	10
			minimum	0
		acceptable_error	Maximum offset from target, this is used to leverage inequality constraints and define the bandwidth of feasibility.
			type	number
			maximum	5
			minimum	1e-06
			default	0.01
mass	Enforcing a target blade mass (useful for inverse design approaches)
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	target	Value of the target blade mass
		type	number
		maximum	300000
		minimum	0
	acceptable_error	Maximum offset from target, this is used to leverage inequality constraints and define the bandwidth of feasibility.
		type	number
		maximum	50000
		minimum	0
moment_coefficient	(EXPERIMENTAL) Targeted blade moment coefficient (useful for managing root flap loads or inverse design approaches that is not recommendend for general use)
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	min	type	number
		maximum	5
		minimum	0.01
		default	0.15
	max	type	number
		maximum	5
		minimum	0.01
		default	0.15
match_cl_cd	(EXPERIMENTAL) Targeted airfoil cl/cd ratio (useful for inverse design approaches that is not recommendend for general use)
	type	object
	properties
	flag_cl	Activates as a design variable or constraint
		type	boolean
	flag_cd	Activates as a design variable or constraint
		type	boolean
	filename	file path to constraint data
		type	string
match_L_D	(EXPERIMENTAL) Targeted blade moment coefficient (useful for managing root flap loads or inverse design approaches that is not recommendend for general use)
	type	object
	properties
	flag_L	Activates as a design variable or constraint
		type	boolean
	flag_D	Activates as a design variable or constraint
		type	boolean
	filename	file path to constraint data
		type	string
AEP	Set a minimum bound on AEP in kWh when optimizing the blade and rotor parameters
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	min	type	number
		minimum	1
		default	1
thrust_coeff	(EXPERIMENTAL) Bound the ccblade thrust coefficient away from unconstrained optimal when optimizing for power, for highly-loaded rotors
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		minimum	0
	upper_bound	type	number
		minimum	0
tower	Constraints associated with the tower design
	type	object
	properties
	height_constraint	Double-sided constraint to ensure total tower height meets target hub height when adjusting section heights
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	type	number
			maximum	10
			minimum	1e-06
			default	0.01
		upper_bound	type	number
			maximum	10
			minimum	1e-06
			default	0.01
	stress	Enforce a maximum allowable von Mises stress relative to the material yield stress with safety factor of gamma_f * gamma_m * gamma_n
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	global_buckling	Enforce a global buckling limit using Eurocode checks with safety factor of gamma_f * gamma_b
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	shell_buckling	Enforce a shell buckling limit using Eurocode checks with safety factor of gamma_f * gamma_b
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	slope	Ensure that the diameter moving up the tower at any node is always equal or less than the diameter of the node preceding it
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	thickness_slope	Ensure that the thickness moving up the tower at any node is always equal or less than the thickness of the section preceding it
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	d_to_t	Double-sided constraint to ensure target diameter to thickness ratio for manufacturing and structural objectives
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	type	number
			maximum	2000
			minimum	1
			default	50
		upper_bound	type	number
			maximum	2000
			minimum	1
			default	50
	taper	Enforcing a max allowable conical frustum taper ratio per section
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	type	number
			maximum	1
			minimum	0.001
			default	0.5
	frequency	Frequency separation constraint between all tower modal frequencies and blade period (1P) and passing (3P) frequencies at rated conditions using gamma_freq margin.
type		object
properties
flag	Activates as a design variable or constraint
	type	boolean
frequency_1	Targeted range for tower first frequency constraint. Since first and second frequencies are generally the same for the tower, this usually governs the second frequency as well (both fore-aft and side-side first frequency)
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		maximum	5
		minimum	0.01
		default	0.1
	upper_bound	type	number
		maximum	5
		minimum	0.01
		default	0.1
monopile	Constraints associated with the monopile design
	type	object
	properties
	stress	Enforce a maximum allowable von Mises stress relative to the material yield stress with safety factor of gamma_f * gamma_m * gamma_n
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	global_buckling	Enforce a global buckling limit using Eurocode checks with safety factor of gamma_f * gamma_b
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	shell_buckling	Enforce a shell buckling limit using Eurocode checks with safety factor of gamma_f * gamma_b
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	slope	Ensure that the diameter moving up the tower at any node is always equal or less than the diameter of the node preceding it
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	thickness_slope	Ensure that the thickness moving up the tower at any node is always equal or less than the thickness of the section preceding it
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	d_to_t	Double-sided constraint to ensure target diameter to thickness ratio for manufacturing and structural objectives
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	type	number
			maximum	2000
			minimum	1
			default	50
		upper_bound	type	number
			maximum	2000
			minimum	1
			default	50
	taper	Enforcing a max allowable conical frustum taper ratio per section
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	type	number
			maximum	1
			minimum	0.001
			default	0.5
	frequency_1	Targeted range for tower first frequency constraint. Since first and second frequencies are generally the same for the tower, this usually governs the second frequency as well (both fore-aft and side-side first frequency)
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	type	number
			maximum	5
			minimum	0.01
			default	0.1
		upper_bound	type	number
			maximum	5
			minimum	0.01
			default	0.1
	pile_depth	Ensures that the submerged suction pile depth meets a minimum value
type		object
properties
flag	Activates as a design variable or constraint
	type	boolean
lower_bound	type	number
	maximum	200
	minimum	0
tower_diameter_coupling	Ensures that the top diameter of the monopile is the same or larger than the base diameter of the tower
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
jacket	Constraints associated with the monopile design
	type	object
	properties
	stress	Enforce a maximum allowable von Mises stress relative to the material yield stress with safety factor of gamma_f * gamma_m * gamma_n
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	global_buckling	Enforce a global buckling limit using Eurocode checks with safety factor of gamma_f * gamma_b
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	shell_buckling	Enforce a shell buckling limit using Eurocode checks with safety factor of gamma_f * gamma_b
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	slope	Ensure that the diameter moving up the tower at any node is always equal or less than the diameter of the node preceding it
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	thickness_slope	Ensure that the thickness moving up the tower at any node is always equal or less than the thickness of the section preceding it
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	d_to_t	Double-sided constraint to ensure target diameter to thickness ratio for manufacturing and structural objectives
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	type	number
			maximum	2000
			minimum	1
			default	50
		upper_bound	type	number
			maximum	2000
			minimum	1
			default	50
	taper	Enforcing a max allowable conical frustum taper ratio per section
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	type	number
			maximum	1
			minimum	0.001
			default	0.5
	frequency_1	Targeted range for tower first frequency constraint. Since first and second frequencies are generally the same for the tower, this usually governs the second frequency as well (both fore-aft and side-side first frequency)
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	type	number
			maximum	5
			minimum	0.01
			default	0.1
		upper_bound	type	number
			maximum	5
			minimum	0.01
			default	0.1
	pile_depth	Ensures that the submerged suction pile depth meets a minimum value
type		object
properties
flag	Activates as a design variable or constraint
	type	boolean
lower_bound	type	number
	maximum	200
	minimum	0
tower_diameter_coupling	Ensures that the top diameter of the monopile is the same or larger than the base diameter of the tower
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
hub	type	object
	properties
	hub_diameter	Ensure that the diameter of the hub is sufficient to accommodate the number of blades and blade root diameter
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
drivetrain	type	object
	properties
	lss	Enforce a maximum allowable von Mises stress relative to the material yield stress with safety factor of gamma_f * gamma_m * gamma_n
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	hss	Enforce a maximum allowable von Mises stress relative to the material yield stress with safety factor of gamma_f * gamma_m * gamma_n
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	bedplate	Enforce a maximum allowable von Mises stress relative to the material yield stress with safety factor of gamma_f * gamma_m * gamma_n
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	mb1	Ensure that the angular deflection at this meain bearing does not exceed the maximum allowable deflection for the bearing type
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	mb2	Ensure that the angular deflection at this meain bearing does not exceed the maximum allowable deflection for the bearing type
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	length	Ensure that the bedplate length is sufficient to meet desired overhang value
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	height	Ensure that the bedplate height is sufficient to meet desired nacelle height value
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	access	For direct-drive configurations only, ensure that the inner diameter of the nose/turret is big enough to allow human access
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Minimum size to ensure human maintenance access
			type	number
			maximum	5
			minimum	0.1
			default	2
	shaft_deflection	Allowable non-torque deflection of the shaft, in meters, at the generator rotor attachment for direct drive or gearbox attachment for geared drive
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		upper_bound	Upper limit of deflection
			type	number
			maximum	1
			minimum	1e-06
			default	0.0001
	shaft_angle	Allowable non-torque angular deflection of the shaft, in radians, at the generator rotor attachment for direct drive or gearbox attachment for geared drive
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		upper_bound	Upper limit of angular deflection
			type	number
maximum			1
minimum			1e-05
default			0.001
stator_deflection	Allowable deflection of the nose or bedplate, in meters, at the generator stator attachment
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	upper_bound	Upper limit of deflection
		type	number
		maximum	1
		minimum	1e-06
		default	0.0001
stator_angle	Allowable non-torque angular deflection of the nose or bedplate, in radians, at the generator stator attachment
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	upper_bound	Upper limit of angular deflection
		type	number
		maximum	1
		minimum	1e-05
		default	0.001
ecc	For direct-drive configurations only, ensure that the elliptical bedplate length is greater than its height
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
floating	type	object
	properties
	operational_heel	Ensure that the mooring system has enough restoring force to keep the heel/pitch angle below this limit
		type	object
		properties
		upper_bound	type	number
			maximum	0.7853981633974483
			minimum	0.017453292519943295
			default	0.17453292519943295
	survival_heel	Ensure that the mooring system has enough restoring force to keep the heel/pitch angle below this limit
		type	object
		properties
		upper_bound	type	number
			maximum	0.7853981633974483
			minimum	0.017453292519943295
			default	0.17453292519943295
	max_surge	Ensure that the mooring system has enough restoring force so that this surge distance, expressed as a fraction of water depth, is not exceeded
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		upper_bound	type	number
			maximum	1
			minimum	0.01
			default	0.1
	buoyancy	Ensures that the platform displacement is sufficient to support the weight of the turbine system
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	fixed_ballast_capacity	Ensures that there is sufficient volume to hold the specified fixed (permanent) ballast
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	variable_ballast_capacity	Ensures that there is sufficient volume to hold the needed water (variable) ballast to achieve neutral buoyancy
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	metacentric_height	Ensures hydrostatic stability with a positive metacentric height
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	type	number
			minimum	0
			default	10
	freeboard_margin	Ensures that the freeboard (top points of structure) of floating platform stays above the waterline at the survival heel offset
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	draft_margin	Ensures that the draft (bottom points of structure) of floating platform stays beneath the waterline at the survival heel offset
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	fairlead_depth	Ensures that the mooring line attachment depth (fairlead) is sufficiently beneath the water line that it is not exposed at the significant wave height
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
	mooring_surge	Ensures that the mooring lines have sufficient restoring force to overcome rotor thrust at the max surge offset
type		object
properties
flag	Activates as a design variable or constraint
	type	boolean
mooring_heel	Ensures that the mooring lines have sufficient restoring force to overcome rotor thrust at the max heel offset
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
mooring_tension	Keep the mooring line tension below its breaking point
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
mooring_length	Keep the mooring line length within the bounds for catenary hang or TLP tension
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
anchor_vertical	Ensure that the maximum vertical force on the anchor does not exceed limit
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
anchor_lateral	Ensure that the maximum lateral force on the anchor does not exceed limit
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
stress	Enforce a maximum allowable von Mises stress relative to the material yield stress with safety factor of gamma_f * gamma_m * gamma_n
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
global_buckling	Enforce a global buckling limit using Eurocode checks with safety factor of gamma_f * gamma_b
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
shell_buckling	Enforce a shell buckling limit using Eurocode checks with safety factor of gamma_f * gamma_b
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
surge_period	Ensure that the rigid body period stays within bounds
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		minimum	0.01
		default	1
	upper_bound	type	number
		minimum	0.01
		default	1
sway_period	Ensure that the rigid body period stays within bounds
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		minimum	0.01
		default	1
	upper_bound	type	number
		minimum	0.01
		default	1
heave_period	Ensure that the rigid body period stays within bounds
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		minimum	0.01
		default	1
	upper_bound	type	number
		minimum	0.01
		default	1
roll_period	Ensure that the rigid body period stays within bounds
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		minimum	0.01
		default	1
	upper_bound	type	number
		minimum	0.01
		default	1
pitch_period	Ensure that the rigid body period stays within bounds
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		minimum	0.01
		default	1
	upper_bound	type	number
		minimum	0.01
		default	1
yaw_period	Ensure that the rigid body period stays within bounds
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		minimum	0.01
		default	1
	upper_bound	type	number
		minimum	0.01
		default	1
user	User-defined constraints based on full variable name. Must enter a lower_bound and/or an upper bound for each constraint
	type	array
	items	type	object
		properties
		name	User-specified constraint variable using full name in the WISDEM namespace
			type	string
		lower_bound	Variable must be greater than or equal to this value (entry must have lower_bound and/or upper_bound)
			type	number
		upper_bound	Variable must be less than or equal to this value (entry must have lower_bound and/or upper_bound)
			type	number
		indices	Optional string of python indices in a list (i.e. [0,1,2]) or slice (i.e. [:3])
			type	string

merit_figure

Objective function / merit figure for optimization (not checked via schema, but in python). Choices are LCOE- levelized cost of energy, AEP- turbine annual energy production, Cp- rotor power coefficient, blade_mass, tower_mass, tower_cost, monopile_mass, monopile_cost, structural_mass- tower+monopile mass, structural_cost- tower+monopile cost, blade_tip_deflection- blade tip deflection distance towards tower, My_std- blade flap moment standard deviation, flp1_std- trailing flap standard deviation, platform_mass- floating platform mass without variable ballast, inverse_design- custom inverse design used to match reference values of any arbitrary output

type	string
default	LCOE

merit_figure_user

Provides mechanism for a user-specific objective function. Overrides any entries in merit_figure.

type	object
properties
name	User-specified objective function / merit figure using full variable name in the WISDEM namespace
	type	string
ref	Approximate expected value of the user-defined objective function (just need the nearest order-of-magnitude) for scaling the objective function for optimization conditioning. For example, if you expect values in the range of 6000, enter in 1000.
	type	number
	default	1
max_flag	If true, this maximizes the objective function. If false, then minimize
	type	boolean

inverse_design

For use with the inverse_design merit_figure. Specifies the reference output variable’s ‘prom_name’ name and the desired value, accepts multiple variables. A normalized difference between the actual value and reference value is calculated for each variable. A Root Mean Square (RMS) is calculated with all variables and the optimizer minimizes the RMS. If the refernce output variable is an array, specify the element index number via “idx”.

type	object
additionalProperties	type	object
	properties
	ref_value	type	number / array
	indices	type	array
		default	0
	units	type	string

driver

type	object
properties
optimization	Specification of the optimization driver (optimization algorithm) parameters
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	tol	Convergence tolerance (relative)
		type	number
		maximum	1
		minimum	1e-12
		default	1e-06
	max_iter	Max number of optimization iterations
		type	integer
		maximum	100000
		minimum	0
		default	100
	max_major_iter	Max number of major optimization iterations of SNOPT
		type	integer
		maximum	100000
		minimum	0
		default	10
	max_minor_iter	Max number of minor optimization iterations of SNOPT
		type	integer
		maximum	100000
		minimum	0
		default	100
	time_limit	Max seconds of major iteration runtime for SNOPT
		type	integer
		minimum	0
	max_function_calls	Max number of calls to objective function evaluation
		type	integer
		maximum	100000000
		minimum	0
		default	100000
	solver	Optimization driver.
		type	string
		enum	SLSQP, CONMIN, COBYLA, SNOPT, Nelder-Mead, GA, GN_DIRECT, GN_DIRECT_L, GN_DIRECT_L_NOSCAL, GN_ORIG_DIRECT, GN_ORIG_DIRECT_L, GN_AGS, GN_ISRES, LN_COBYLA, LD_MMA, LD_CCSAQ, LD_SLSQP, NSGA2, DE
		default	SLSQP
	step_size	Maximum step size for finite difference approximation
		type	number
		maximum	100
		minimum	1e-10
		default	0.001
	form	Finite difference calculation mode
		type	string
		enum	central, forward, complex
		default	central
	step_calc	Step type for computing the size of the finite difference step.
		type	string
		enum	None, abs, rel_avg, rel_element, rel_legacy
		default	None
	debug_print	Toggle driver debug printing
		type	boolean
design_of_experiments	Specification of the design of experiments driver parameters
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	run_parallel	Toggle parallel model runs
		type	boolean
		default	True
	generator	Type of model input generator.
		type	string
		enum	Uniform, FullFact, PlackettBurman, BoxBehnken, LatinHypercube
		default	Uniform
	num_samples	Number of samples to evaluate model at (Uniform and LatinHypercube only)
		type	integer
		maximum	1000000
		minimum	1
		default	5
	seed	Random seed to use if design is randomized
		type	integer
		maximum	1000000
		minimum	1
		default	2
	levels	Number of evenly spaced levels between each design variable lower and upper bound (FullFactorial only)
		type	integer
		maximum	1000000
		minimum	1
		default	2
	criterion	Descriptor of sampling method for LatinHypercube generator
		type	string
		enum	None, center, c, maximin, m, centermaximin, cm, correelation, corr
		default	center
	iterations	Number of iterations in maximin and correlations algorithms (LatinHypercube only)
		type	integer
		maximum	1000000
		minimum	1
		default	2
	debug_print	Toggle driver debug printing
		type	boolean
step_size_study	Specification of the step size study parameters
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	step_sizes	List of step size values to use for the study
		type	array
		default	0.01
			0.005
			0.001
			0.0005
			0.0001
			5e-05
			1e-05
			5e-06
			1e-06
			5e-07
			1e-07
			5e-08
			1e-08
	form	Finite difference calculation mode
		type	string
		enum	central, forward, complex
		default	central
	of	Functions of interest for which we’ll compute total derivatives
		type	array
	wrt	Design variables we’ll perturb for the step size study
		type	array
	driver_scaling	When True, return derivatives that are scaled according to either the adder and scaler or the ref and ref0 values that were specified when add_design_var, add_objective, and add_constraint were called on the model.
		type	boolean

recorder

Optimization iteration recording via OpenMDAO

type	object
properties
flag	Activates as a design variable or constraint
	type	boolean
file_name	OpenMDAO recorder output SQL database file
	type	string
	default	log_opt.sql
just_dvs	If true, only record design variables.
	type	boolean
includes	List of variables to include in recorder
	type	array

Design Variables Schema

The schema guide for the design variables is:

Sets the design variables in a design optimization and analysis
type	object
properties
rotor_diameter	Adjust the rotor diameter by changing the blade length (all blade properties constant with respect to non-dimensional span coordinates)
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	minimum	type	number
		maximum	1000
		minimum	0
	maximum	type	number
		maximum	1000
		minimum	0
blade	Design variables associated with the wind turbine blades
	type	object
	properties
	aero_shape	Design variables associated with the blade aerodynamic shape
		type	object
		properties
		twist	Blade twist as a design variable by adding or subtracting radians from the initial value at spline control points along the span.
			type	object
			properties
			flag	Activates as a design variable or constraint
				type	boolean
			inverse	Words TODO?
				type	boolean
			n_opt	Number of equally-spaced control points of the spline parametrizing the twist distribution along blade span.
				type	integer
				minimum	4
				default	8
			max_decrease	Maximum allowable decrease of twist at each DV location along blade span.
				type	number
				default	0.1
			max_increase	Maximum allowable increase of twist at each DV location along blade span.
				type	number
				default	0.1
			index_start	First index of the array of design variables/constraints that is optimized/constrained
				type	integer
				minimum	0
			index_end	Last index of the array of design variables/constraints that is optimized/constrained
				type	integer
				minimum	0
				default	8
		chord	Blade chord as a design variable by scaling (multiplying) the initial value at spline control points along the span.
			type	object
			properties
			flag	Activates as a design variable or constraint
				type	boolean
			n_opt	Number of equally-spaced control points of the spline parametrizing the chord distribution along blade span.
				type	integer
				minimum	4
				default	8
			max_decrease	Maximum nondimensional decrease at each optimization location
				type	number
				default	0.5
			max_increase	Maximum nondimensional increase at each optimization location
				type	number
				default	1.5
			index_start	First index of the array of design variables/constraints that is optimized/constrained
				type	integer
				minimum	0
			index_end	Last index of the array of design variables/constraints that is optimized/constrained
				type	integer
				minimum	0
				default	8
		af_positions	Adjust airfoil positions along the blade span.
			type	object
			properties
			flag	Activates as a design variable or constraint
				type	boolean
			af_start	Index of airfoil where the optimization can start shifting airfoil position. The airfoil at blade tip is always locked.
				type	integer
				minimum	1
				default	4
		rthick	Blade relative thickness as a design variable by scaling (multiplying) the initial value at spline control points along the span. This requires the INN for airfoil design
			type	object
			properties
flag			Activates as a design variable or constraint
			type	boolean
n_opt			Number of equally-spaced control points of the spline parametrizing the relative thickness distribution along blade span.
	type		integer
	minimum		4
	default		8
max_decrease	Maximum nondimensional decrease at each optimization location
	type	number
	default	0.5
max_increase	Maximum nondimensional increase at each optimization location
	type	number
	default	1.5
index_start	First index of the array of design variables/constraints that is optimized/constrained
	type	integer
	minimum	0
index_end	Last index of the array of design variables/constraints that is optimized/constrained
	type	integer
	minimum	0
	default	8
L/D	Lift to drag ratio as a design variable by scaling (multiplying) the initial value at spline control points along the span. This requires the INN for airfoil design
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	n_opt	Number of equally-spaced control points of the spline parametrizing the lift to drag ratio distribution along blade span.
		type	integer
		minimum	4
		default	8
	max_decrease	Maximum nondimensional decrease at each optimization location
		type	number
		default	0.5
	max_increase	Maximum nondimensional increase at each optimization location
		type	number
		default	1.5
	index_start	First index of the array of design variables/constraints that is optimized/constrained
		type	integer
		minimum	0
	index_end	Last index of the array of design variables/constraints that is optimized/constrained
		type	integer
		minimum	0
		default	8
c_d	Drag coefficient at rated conditions as a design variable by scaling (multiplying) the initial value at spline control points along the span. This requires the INN for airfoil design
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	n_opt	Number of equally-spaced control points of the spline parametrizing the drag coefficient distribution along blade span.
		type	integer
		minimum	4
		default	8
	max_decrease	Maximum nondimensional decrease at each optimization location
		type	number
		default	0.5
	max_increase	Maximum nondimensional increase at each optimization location
		type	number
		default	1.5
	index_start	First index of the array of design variables/constraints that is optimized/constrained
		type	integer
		minimum	0
	index_end	Last index of the array of design variables/constraints that is optimized/constrained
		type	integer
		minimum	0
		default	8
stall_margin	Stall margin at rated conditions as a design variable by scaling (multiplying) the initial value at spline control points along the span. This requires the INN for airfoil design
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	n_opt	Number of equally-spaced control points of the spline parametrizing the stall margin distribution along blade span.
		type	integer
		minimum	4
		default	8
	max_decrease	Maximum nondimensional decrease at each optimization location
		type	number
		default	0.5
	max_increase	Maximum nondimensional increase at each optimization location
		type	number
		default	1.5
	index_start	First index of the array of design variables/constraints that is optimized/constrained
		type	integer
		minimum	0
	index_end	Last index of the array of design variables/constraints that is optimized/constrained
		type	integer
		minimum	0
		default	8
z	INN design parameter z
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	n_opt	z design parameter count
		type	integer
		default	3
	lower_bound	type	number
		maximum	1e+30
		minimum	-1e+30
		default	-1
	upper_bound	type	number
		maximum	1e+30
		minimum	-1e+30
		default	1
structure	Design variables associated with the internal blade structure
	type	array
	items	Set the thickness of any blade layer as a design variable by scaling (multiplying) the initial value at spline control points along the span.
		type	object
		properties
		layer_name	Name of blade structural layer to be optimized
			type	string
		n_opt	Number of equally-spaced control points of the spline parametrizing the thickness of the layer.
			type	integer
			minimum	4
			default	8
		max_decrease	Maximum nondimensional decrease at each optimization location
			type	number
			default	0.5
		max_increase	Maximum nondimensional increase at each optimization location
			type	number
			default	1.5
		index_start	First index of the array of design variables/constraints that is optimized/constrained
			type	integer
			minimum	0
		index_end	Last index of the array of design variables/constraints that is optimized/constrained
			type	integer
			minimum	0
			default	8
control	Design variables associated with the control of the wind turbine
	type	object
	properties
	tsr	Adjust the tip-speed ratio (ratio between blade tip velocity and steady hub-height wind speed)
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		minimum	Minimum allowable value
			type	number
			maximum	30
			minimum	0
		maximum	Maximum allowable value
			type	number
			maximum	30
			minimum	0
hub	Design variables associated with the hub
	type	object
	properties
	cone	Adjust the blade attachment coning angle (positive values are always away from the tower whether upwind or downwind)
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			maximum	0.5235987756
			minimum	0
		upper_bound	Design variable bound
			type	number
			maximum	0.5235987756
			minimum	0
	hub_diameter	Adjust the rotor hub diameter
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Lowest value allowable for hub diameter
			type	number
			maximum	30
			minimum	0
		upper_bound	Highest value allowable for hub diameter
			type	number
			maximum	30
			minimum	0
			default	30
drivetrain	Design variables associated with the drivetrain
	type	object
	properties
	uptilt	Adjust the drive shaft tilt angle (positive values tilt away from the tower whether upwind or downwind)
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			maximum	0.5235987756
			minimum	0
		upper_bound	Design variable bound
			type	number
			maximum	0.5235987756
			minimum	0
	overhang	Adjust the x-distance, parallel to the ground or still water line, from the tower top center to the rotor apex.
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Lowest value allowable for design variable
			type	number
			maximum	30
			minimum	0.1
			default	0.1
		upper_bound	Highest value allowable for design variable
			type	number
			maximum	30
			minimum	0.1
			default	0.1
	distance_tt_hub	Adjust the z-dimension height from the tower top to the rotor apex
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Lowest value allowable for design variable
			type	number
			maximum	30
			minimum	0.1
			default	0.1
		upper_bound	Highest value allowable for design variable
			type	number
			maximum	30
			minimum	0.1
			default	0.1
	distance_hub_mb	Adjust the distance along the drive staft from the hub flange to the first main bearing
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Lowest value allowable for design variable
			type	number
			maximum	30
			minimum	0.1
			default	0.1
		upper_bound	Highest value allowable for design variable
			type	number
			maximum	30
			minimum	0.1
			default	0.1
	distance_mb_mb	Adjust the distance along the drive staft from the first to the second main bearing
		type	object
		properties
flag		Activates as a design variable or constraint
		type	boolean
lower_bound		Lowest value allowable for design variable
		type	number
		maximum	30
		minimum	0.1
		default	0.1
upper_bound		Highest value allowable for design variable
		type	number
		maximum	30
		minimum	0.1
		default	0.1
generator_length	Adjust the distance along the drive staft between the generator rotor drive shaft attachment to the stator bedplate attachment
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	Lowest value allowable for design variable
		type	number
		maximum	30
		minimum	0.1
		default	0.1
	upper_bound	Highest value allowable for design variable
		type	number
		maximum	30
		minimum	0.1
		default	0.1
gear_ratio	For geared configurations only, adjust the gear ratio of the gearbox that multiplies the shaft speed and divides the torque
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		maximum	500
		minimum	1
		default	1
	upper_bound	type	number
		maximum	1000
		minimum	1
		default	150
lss_diameter	Adjust the diameter at the beginning and end of the low speed shaft (assumes a linear taper)
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	Lowest value allowable for design variable
		type	number
		maximum	30
		minimum	0.1
		default	0.1
	upper_bound	Highest value allowable for design variable
		type	number
		maximum	30
		minimum	0.1
		default	0.1
hss_diameter	Adjust the diameter at the beginning and end of the high speed shaft (assumes a linear taper)
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	Lowest value allowable for design variable
		type	number
		maximum	30
		minimum	0.1
		default	0.1
	upper_bound	Highest value allowable for design variable
		type	number
		maximum	30
		minimum	0.1
		default	0.1
nose_diameter	For direct-drive configurations only, adjust the diameter at the beginning and end of the nose/turret (assumes a linear taper)
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	Lowest value allowable for design variable
		type	number
		maximum	30
		minimum	0.1
		default	0.1
	upper_bound	Highest value allowable for design variable
		type	number
		maximum	30
		minimum	0.1
		default	0.1
lss_wall_thickness	Adjust the thickness at the beginning and end of the low speed shaft (assumes a linear taper)
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		maximum	3
		minimum	0.001
		default	0.001
	upper_bound	type	number
		maximum	5
		minimum	0.01
		default	1
hss_wall_thickness	Adjust the thickness at the beginning and end of the high speed shaft (assumes a linear taper)
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		maximum	3
		minimum	0.001
		default	0.001
	upper_bound	type	number
		maximum	5
		minimum	0.01
		default	1
nose_wall_thickness	For direct-drive configurations only, adjust the thickness at the beginning and end of the nose/turret (assumes a linear taper)
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		maximum	3
		minimum	0.001
		default	0.001
	upper_bound	type	number
		maximum	5
		minimum	0.01
		default	1
bedplate_wall_thickness	For direct-drive configurations only, adjust the wall thickness along the elliptical bedplate
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		maximum	3
		minimum	0.001
		default	0.001
	upper_bound	type	number
		maximum	5
		minimum	0.01
		default	1
bedplate_web_thickness	For geared configurations only, adjust the I-beam web thickness of the bedplate
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		maximum	3
		minimum	0.001
		default	0.001
	upper_bound	type	number
		maximum	5
		minimum	0.01
		default	1
bedplate_flange_thickness	For geared configurations only, adjust the I-beam flange thickness of the bedplate
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		maximum	3
		minimum	0.001
		default	0.001
	upper_bound	type	number
		maximum	5
		minimum	0.01
		default	1
bedplate_flange_width	For geared configurations only, adjust the I-beam flange width of the bedplate
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	type	number
		maximum	3
		minimum	0.001
		default	0.001
	upper_bound	type	number
		maximum	5
		minimum	0.01
		default	1
tower	Design variables associated with the tower or monopile
	type	object
	properties
	outer_diameter	Adjust the outer diamter of the cylindrical column at nodes along the height. Linear tapering is assumed between the nodes, creating conical frustums in each section
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			maximum	100
			minimum	0.1
			default	5
		upper_bound	Design variable bound
			type	number
			maximum	100
			minimum	0.1
			default	5
	layer_thickness	Adjust the layer thickness of each section in the column
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			maximum	1
			minimum	1e-05
			default	0.01
		upper_bound	Design variable bound
			type	number
			maximum	1
			minimum	1e-05
			default	0.01
	section_height	Adjust the height of each conical section
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			maximum	100
			minimum	0.1
			default	5
		upper_bound	Design variable bound
			type	number
			maximum	100
			minimum	0.1
			default	5
	E	Isotropic Young’s modulus
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			maximum	1000000000000
			minimum	1
			default	200000000000
		upper_bound	Design variable bound
			type	number
			maximum	1000000000000
			minimum	1
			default	200000000000
	rho	Material density of the tower
type		object
properties
flag	Activates as a design variable or constraint
	type	boolean
lower_bound	Design variable bound
	type	number
	maximum	100000
	minimum	1
	default	7800
upper_bound	Design variable bound
	type	number
	maximum	100000
	minimum	1
	default	7800
monopile	Design variables associated with the tower or monopile
	type	object
	properties
	outer_diameter	Adjust the outer diamter of the cylindrical column at nodes along the height. Linear tapering is assumed between the nodes, creating conical frustums in each section
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			maximum	100
			minimum	0.1
			default	5
		upper_bound	Design variable bound
			type	number
			maximum	100
			minimum	0.1
			default	5
	layer_thickness	Adjust the layer thickness of each section in the column
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			maximum	1
			minimum	1e-05
			default	0.01
		upper_bound	Design variable bound
			type	number
			maximum	1
			minimum	1e-05
			default	0.01
	section_height	Adjust the height of each conical section
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			maximum	100
			minimum	0.1
			default	5
		upper_bound	Design variable bound
			type	number
			maximum	100
			minimum	0.1
			default	5
	E	Isotropic Young’s modulus
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			maximum	1000000000000
			minimum	1
			default	200000000000
		upper_bound	Design variable bound
			type	number
			maximum	1000000000000
			minimum	1
			default	200000000000
	rho	Material density of the tower
type		object
properties
flag	Activates as a design variable or constraint
	type	boolean
lower_bound	Design variable bound
	type	number
	maximum	100000
	minimum	1
	default	7800
upper_bound	Design variable bound
	type	number
	maximum	100000
	minimum	1
	default	7800
jacket	Design variables associated with the jacket
	type	object
	properties
	foot_head_ratio	Adjust the ratio of the jacket foot (bottom) radius to that of the head (top)
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			maximum	100
			minimum	1
			default	1.5
		upper_bound	Design variable bound
			type	number
			maximum	100
			minimum	1
			default	1.5
	r_head	Adjust the radius of the jacket head.
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			maximum	100
			minimum	0.1
			default	5
		upper_bound	Design variable bound
			type	number
			maximum	100
			minimum	0.1
			default	5
	leg_diameter	Adjust the diameter of the jacket legs.
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			maximum	10
			minimum	0.1
			default	1.5
		upper_bound	Design variable bound
			type	number
			maximum	10
			minimum	0.1
			default	1.5
	height	Overall jacket height, meters.
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			maximum	1000
			minimum	0.1
			default	70
		upper_bound	Design variable bound
			type	number
			maximum	1000
			minimum	0.1
			default	70
	leg_thickness	Adjust the leg thicknesses of the jacket.
type		object
properties
flag	Activates as a design variable or constraint
	type	boolean
lower_bound	Design variable bound
	type	number
	maximum	10
	minimum	0.001
	default	0.1
upper_bound	Design variable bound
	type	number
	maximum	10
	minimum	0.001
	default	0.1
brace_diameters	Adjust the brace diameters of the jacket.
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	Design variable bound
		type	number
		maximum	10
		minimum	0.001
		default	0.1
	upper_bound	Design variable bound
		type	number
		maximum	10
		minimum	0.001
		default	0.1
brace_thicknesses	Adjust the brace thicknesses of the jacket.
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	Design variable bound
		type	number
		maximum	10
		minimum	0.001
		default	0.1
	upper_bound	Design variable bound
		type	number
		maximum	10
		minimum	0.001
		default	0.1
bay_spacing	Jacket bay nodal spacing.
	type	object
	properties
	flag	Activates as a design variable or constraint
		type	boolean
	lower_bound	Design variable bound
		type	number
		maximum	1
		minimum	0
		default	0.1
	upper_bound	Design variable bound
		type	number
		maximum	1
		minimum	0
		default	0.1
floating	Design variables associated with the floating platform
	type	object
	properties
	joints	Design variables associated with the node/joint locations used in the floating platform
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		z_coordinate	List of joints or members by name sets that should be adjusted. A single entry for an independent joint/member or a list of names for joints/members that are linked by symmetry
			type	array
			items	type	object
				properties
				names	Joint or member names of those that are linked
					type	array
					items	type	string
				lower_bound	Design variable bound
					type	number
				upper_bound	Design variable bound
					type	number
		r_coordinate	List of joints or members by name sets that should be adjusted. A single entry for an independent joint/member or a list of names for joints/members that are linked by symmetry
			type	array
			items	type	object
				properties
				names	Joint or member names of those that are linked
					type	array
					items	type	string
				lower_bound	Design variable bound
					type	number
				upper_bound	Design variable bound
					type	number
	members	Design variables associated with the members used in the floating platform
		type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		groups	Sets of members that share the same design
			type	array
			items	type	object
				properties
				names	Joint or member names of those that are linked
					type	array
					items	type	string
				diameter	Diameter optimization of member group
					type	object
					properties
					lower_bound	Design variable bound
						type	number
						maximum	100
						minimum	0.1
						default	5
					upper_bound	Design variable bound
						type	number
						maximum	100
						minimum	0.1
						default	5
					constant	Should the diameters be constant
						type	boolean
				thickness	Thickness optimization of member group
					type	object
					properties
					lower_bound	Design variable bound
						type	number
						maximum	1
						minimum	1e-05
default						0.01
upper_bound					Design variable bound
					type	number
					maximum	1
					minimum	1e-05
					default	0.01
ballast				Ballast volume optimization of member group
				type	object
				properties
				lower_bound	Design variable bound
					type	number
					minimum	0
				upper_bound	Design variable bound
					type	number
					minimum	0
					default	100000
axial_joints				List of axial joint sets in this member group that are optimized as one
				type	array
				items	type	object
					properties
					names	Joint or member names of those that are linked
						type	array
						items	type	string
					lower_bound	Design variable bound
						type	number
						maximum	1
						minimum	0
					upper_bound	Design variable bound
						type	number
						maximum	1
	minimum					0
	default					1
stiffeners	Stiffener optimization of member group
	type	object
	properties
	ring	Ring stiffener optimization of member group
		type	object
		properties
		size	Ring stiffener sizing multiplier on T-shape
			type	object
			properties
			min_gain	Lower bound on scalar multiplier that will be applied to value at control points
				type	number
				default	0.5
			max_gain	type	number
				default	1.5
		spacing	Ring stiffener spacing along member axis
			type	object
			properties
			lower_bound	Design variable bound
				type	number
				minimum	0
			upper_bound	Design variable bound
				type	number
				minimum	0
				default	0.1
	longitudinal	Longitudinal stiffener optimization of member group
		type	object
		properties
		size	Longitudinal stiffener sizing multiplier on T-shape
			type	object
			properties
			min_gain	Lower bound on scalar multiplier that will be applied to value at control points
				type	number
				default	0.5
			max_gain	type	number
				default	1.5
		spacing	Longitudinal stiffener spacing around member annulus
			type	object
			properties
			lower_bound	Design variable bound
				type	number
				maximum	3.141592653589793
				minimum	0
			upper_bound	Design variable bound
				type	number
				maximum	3.141592653589793
				minimum	0
				default	0.1
mooring	Design variables associated with the mooring system
	type	object
	properties
	line_length	type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			minimum	0
		upper_bound	Design variable bound
			type	number
			minimum	0
	line_diameter	type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			minimum	0
		upper_bound	Design variable bound
			type	number
			minimum	0
	line_mass_density_coeff	type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			minimum	0
		upper_bound	Design variable bound
			type	number
			minimum	0
	line_stiffness_coeff	type	object
		properties
		flag	Activates as a design variable or constraint
			type	boolean
		lower_bound	Design variable bound
			type	number
			minimum	0
		upper_bound	Design variable bound
			type	number
			minimum	0
user_defined	List of user-defined design variables. These must be already listed as OpenMDAO indipendent cariable components.
	type	array
	items	OpenMDAO entries, taken from https://openmdao.org/newdocs/versions/latest/features/core_features/adding_desvars_cons_objs/adding_design_variables.html
		type	object
		properties
		name	Promoted name of the design variable in the system.
			type	string
		lower_bound	Array of lower bounds of this user-defined design variable
			type	array
			items	type	number
		upper_bound	Array of upper bounds of this user-defined design variable
			type	array
			items	type	number
		ref	Value of design var that scales to 1.0 in the driver
			type	array
			items	type	number
		indices	If an input is an array, these indicate which entries are of interest for this particular design variable. These may be positive or negative integers
			type	array
			items	type	number