fastga.models.handling_qualities.tail_sizing.update_vt_area module

Estimation of vertical tail area.

class fastga.models.handling_qualities.tail_sizing.update_vt_area.UpdateVTArea(**kwargs)

Bases: openmdao.core.group.Group

Set the solvers to nonlinear and linear block Gauss–Seidel by default.

initialize()

Perform any one-time initialization run at instantiation.

setup()

Build this group.

This method should be overidden by your Group’s method. The reason for using this method to add subsystem is to save memory and setup time when using your Group while running under MPI. This avoids the creation of systems that will not be used in the current process.

You may call ‘add_subsystem’ to add systems to this group. You may also issue connections, and set the linear and nonlinear solvers for this group level. You cannot safely change anything on children systems; use the ‘configure’ method instead.

Available attributes:

name pathname comm options

fastga.models.handling_qualities.tail_sizing.update_vt_area.side_wash_effect(area_vtp, inputs)

class fastga.models.handling_qualities.tail_sizing.update_vt_area.VTPConstraints(**kwargs)

Bases: openmdao.core.explicitcomponent.ExplicitComponent

Store some bound methods so we can detect runtime overrides.

initialize()

Perform any one-time initialization run at instantiation.

static lateral_equilibrium(x, inputs, beta, rudder_angle, eta_v)

Computes the force on the y axis and the moment difference on the yaw axis

@param inputs : dictionary containing the aircraft properties @param x : array containing the vertical tail plane area in m² and the crab angle in rad @param beta : the sideslip angle we want to compute the VTP area for, in rad @param rudder_angle : the rudder angle we allow ourself to maintain a straight flight path during the crosswind landing @param eta_v : defines the percentage of aircraft dynamic pressure seen by the vtp @return result_array : an array containing the moment and force difference on the appropriate axis.

static lateral_stability(area_vtp, inputs)

target_stability_constraint(inputs)

crosswind_landing_constraint(inputs, area_guess)

engine_out_climb(inputs)

engine_out_takeoff(inputs)

engine_out_landing(inputs)

class fastga.models.handling_qualities.tail_sizing.update_vt_area.UpdateVTAreaVolumeCoefficient(**kwargs)

Bases: openmdao.core.explicitcomponent.ExplicitComponent

Computation of the area of the vertical with given volume coefficient. The formulas and default values are obtained from [Gud13].

Store some bound methods so we can detect runtime overrides.

initialize()

Perform any one-time initialization run at instantiation.

setup()

Declare inputs and outputs.

Available attributes:

name pathname comm options

setup_partials()

Declare partials.

This is meant to be overridden by component classes. All partials should be declared here since this is called after all size/shape information is known for all variables.

compute(inputs, outputs, discrete_inputs=None, discrete_outputs=None)

Compute outputs given inputs. The model is assumed to be in an unscaled state.

Parameters

• inputs (Vector) – Unscaled, dimensional input variables read via inputs[key].

• outputs (Vector) – Unscaled, dimensional output variables read via outputs[key].

• discrete_inputs (dict or None) – If not None, dict containing discrete input values.

• discrete_outputs (dict or None) – If not None, dict containing discrete output values.

compute_partials(inputs, partials, discrete_inputs=None)

Compute sub-jacobian parts. The model is assumed to be in an unscaled state.

Parameters

• inputs (Vector) – Unscaled, dimensional input variables read via inputs[key].

• partials (Jacobian) – Sub-jac components written to partials[output_name, input_name]..

• discrete_inputs (dict or None) – If not None, dict containing discrete input values.