"""Defines the StochasticSolidMotor class."""
from rocketpy.motors import SolidMotor
from .stochastic_motor_model import StochasticMotorModel
[docs]
class StochasticSolidMotor(StochasticMotorModel):
"""A Stochastic Solid Motor class that inherits from StochasticModel.
See Also
--------
:ref:`stochastic_model` and :class:`SolidMotor <rocketpy.motors.SolidMotor>`
Attributes
----------
object : SolidMotor
SolidMotor object to be used for validation.
thrust_source : list
List of strings representing the thrust source to be selected.
total_impulse : int, float, tuple, list
Total impulse of the motor in newton seconds.
burn_start_time : int, float, tuple, list
Burn start time of the motor in seconds.
burn_out_time : int, float, tuple, list
Burn out time of the motor in seconds.
dry_mass : int, float, tuple, list
Dry mass of the motor in kilograms.
dry_I_11 : int, float, tuple, list
Dry inertia of the motor in kilograms times meters squared.
dry_I_22 : int, float, tuple, list
Dry inertia of the motor in kilograms times meters squared.
dry_I_33 : int, float, tuple, list
Dry inertia of the motor in kilograms times meters squared.
dry_I_12 : int, float, tuple, list
Dry inertia of the motor in kilograms times meters squared.
dry_I_13 : int, float, tuple, list
Dry inertia of the motor in kilograms times meters squared.
dry_I_23 : int, float, tuple, list
Dry inertia of the motor in kilograms times meters squared.
nozzle_radius : int, float, tuple, list
Nozzle radius of the motor in meters.
grain_number : list[int]
Number of grains in the motor. This attribute can not be randomized.
grain_density : int, float, tuple, list
Density of the grains in the motor in kilograms per meters cubed.
grain_outer_radius : int, float, tuple, list
Outer radius of the grains in the motor in meters.
grain_initial_inner_radius : int, float, tuple, list
Initial inner radius of the grains in the motor in meters.
grain_initial_height : int, float, tuple, list
Initial height of the grains in the motor in meters.
grain_separation : int, float, tuple, list
Separation between grains in the motor in meters.
grains_center_of_mass_position : int, float, tuple, list
Position of the center of mass of the grains in the motor in
meters.
center_of_dry_mass_position : int, float, tuple, list
Position of the center of mass of the dry mass in the motor in
meters.
nozzle_position : int, float, tuple, list
Position of the nozzle in the motor in meters.
throat_radius : int, float, tuple, list
Radius of the throat in the motor in meters.
"""
# pylint: disable=too-many-arguments
[docs]
def __init__(
self,
solid_motor,
thrust_source=None,
total_impulse=None,
burn_start_time=None,
burn_out_time=None,
dry_mass=None,
dry_inertia_11=None,
dry_inertia_22=None,
dry_inertia_33=None,
dry_inertia_12=None,
dry_inertia_13=None,
dry_inertia_23=None,
nozzle_radius=None,
grain_number=None, # TODO: can't vary the number of grains.
grain_density=None,
grain_outer_radius=None,
grain_initial_inner_radius=None,
grain_initial_height=None,
grain_separation=None,
grains_center_of_mass_position=None,
center_of_dry_mass_position=None,
nozzle_position=None,
throat_radius=None,
):
"""Initializes the Stochastic Solid Motor class.
See Also
--------
:ref:`stochastic_model` and :class:`SolidMotor <rocketpy.motors.SolidMotor>`
Parameters
----------
solid_motor : SolidMotor
SolidMotor object to be used for validation.
thrust_source : list, optional
List of strings representing the thrust source to be selected.
total_impulse : int, float, tuple, list, optional
Total impulse of the motor in newton seconds.
burn_start_time : int, float, tuple, list, optional
Burn start time of the motor in seconds.
burn_out_time : int, float, tuple, list, optional
Burn out time of the motor in seconds.
dry_mass : int, float, tuple, list, optional
Dry mass of the motor in kilograms.
dry_I_11 : int, float, tuple, list, optional
Dry inertia of the motor in kilograms times meters squared.
dry_I_22 : int, float, tuple, list, optional
Dry inertia of the motor in kilograms times meters squared.
dry_I_33 : int, float, tuple, list, optional
Dry inertia of the motor in kilograms times meters squared.
dry_I_12 : int, float, tuple, list, optional
Dry inertia of the motor in kilograms times meters squared.
dry_I_13 : int, float, tuple, list, optional
Dry inertia of the motor in kilograms times meters squared.
dry_I_23 : int, float, tuple, list, optional
Dry inertia of the motor in kilograms times meters squared.
nozzle_radius : int, float, tuple, list, optional
Nozzle radius of the motor in meters.
grain_density : int, float, tuple, list, optional
Density of the grains in the motor in kilograms per meters cubed.
grain_outer_radius : int, float, tuple, list, optional
Outer radius of the grains in the motor in meters.
grain_initial_inner_radius : int, float, tuple, list, optional
Initial inner radius of the grains in the motor in meters.
grain_initial_height : int, float, tuple, list, optional
Initial height of the grains in the motor in meters.
grain_separation : int, float, tuple, list, optional
Separation between grains in the motor in meters.
grains_center_of_mass_position : int, float, tuple, list, optional
Position of the center of mass of the grains in the motor in
meters.
center_of_dry_mass_position : int, float, tuple, list, optional
Position of the center of mass of the dry mass in the motor in
meters.
nozzle_position : int, float, tuple, list, optional
Position of the nozzle in the motor in meters.
throat_radius : int, float, tuple, list, optional
Radius of the throat in the motor in meters.
"""
super().__init__(
solid_motor,
thrust_source=thrust_source,
total_impulse=total_impulse,
burn_start_time=burn_start_time,
burn_out_time=burn_out_time,
dry_mass=dry_mass,
dry_I_11=dry_inertia_11,
dry_I_22=dry_inertia_22,
dry_I_33=dry_inertia_33,
dry_I_12=dry_inertia_12,
dry_I_13=dry_inertia_13,
dry_I_23=dry_inertia_23,
nozzle_radius=nozzle_radius,
grain_number=grain_number,
grain_density=grain_density,
grain_outer_radius=grain_outer_radius,
grain_initial_inner_radius=grain_initial_inner_radius,
grain_initial_height=grain_initial_height,
grain_separation=grain_separation,
grains_center_of_mass_position=grains_center_of_mass_position,
center_of_dry_mass_position=center_of_dry_mass_position,
nozzle_position=nozzle_position,
throat_radius=throat_radius,
interpolate=None,
coordinate_system_orientation=None,
)
[docs]
def create_object(self):
"""Creates and returns a SolidMotor object from the randomly generated
input arguments.
Returns
-------
SolidMotor
SolidMotor object with the randomly generated input arguments.
"""
generated_dict = next(self.dict_generator())
return SolidMotor(
thrust_source=generated_dict["thrust_source"],
dry_mass=generated_dict["dry_mass"],
dry_inertia=(
generated_dict["dry_I_11"],
generated_dict["dry_I_22"],
generated_dict["dry_I_33"],
generated_dict["dry_I_12"],
generated_dict["dry_I_13"],
generated_dict["dry_I_23"],
),
nozzle_radius=generated_dict["nozzle_radius"],
grain_number=generated_dict["grain_number"],
grain_density=generated_dict["grain_density"],
grain_outer_radius=generated_dict["grain_outer_radius"],
grain_initial_inner_radius=generated_dict["grain_initial_inner_radius"],
grain_initial_height=generated_dict["grain_initial_height"],
grain_separation=generated_dict["grain_separation"],
grains_center_of_mass_position=generated_dict[
"grains_center_of_mass_position"
],
center_of_dry_mass_position=generated_dict["center_of_dry_mass_position"],
nozzle_position=generated_dict["nozzle_position"],
burn_time=(
generated_dict["burn_start_time"],
generated_dict["burn_out_time"],
),
throat_radius=generated_dict["throat_radius"],
reshape_thrust_curve=(
(generated_dict["burn_start_time"], generated_dict["burn_out_time"]),
generated_dict["total_impulse"],
),
coordinate_system_orientation=generated_dict[
"coordinate_system_orientation"
],
interpolation_method=generated_dict["interpolate"],
)
