2DOF mission phases make assumptions on subsystem inputs/outputs with aliases

[jkirk5]

Description

For many 2DOF mission phases such as taxi, takeoff, landing, etc. variables such as Mach number or altitude do not use the Dynamic mission hierarchy but rather custom variables like Mission.Landing.INITIAL_MACH, and any place a subsystem is added that needs that variable as an input, it is aliased like so: promotes_inputs = [(Dynamic.Mission.MACH, Mission.Landing.INITIAL_MACH)].

This causes major problems, because it assumes what the inputs and outputs are for a given subsystem, which we do not know in reality. Specifically, this prevents an electroprop from being used with 2DOF missions, because the motor model does not take altitude as an input, but the current ODE setup requires that input to exist because of aliasing.

2DOF ODEs need to be completely refactored to remove this need for aliasing

Example

No existing example in Aviary. Try this code?

from aviary.interface.methods_for_level2 import AviaryProblem
from aviary.subsystems.propulsion.turboprop_model import TurbopropModel
from aviary.subsystems.propulsion.motor.motor_builder import MotorBuilder
from aviary.utils.process_input_decks import create_vehicle

from aviary.models.large_turboprop_freighter.phase_info import phase_info

prob = AviaryProblem()

# load inputs from .csv to build engine
options, _ = create_vehicle(
    "models/large_turboprop_freighter/large_turboprop_freighter.csv"
)

motor = MotorBuilder(
    'motor',
)

electroprop = TurbopropModel(
    'electroprop', options=options, shaft_power_model=motor
)

# load_inputs needs to be updated to accept an already existing aviary options
prob.load_inputs(
    "models/large_turboprop_freighter/large_turboprop_freighter.csv",
    phase_info,
    engine_builders=[electroprop],
)

prob.check_and_preprocess_inputs()
prob.add_pre_mission_systems()
prob.add_phases()
prob.add_post_mission_systems()
prob.link_phases()
prob.add_driver("SLSQP", max_iter=0, verbosity=0)
prob.add_design_variables()
prob.add_objective()
prob.setup()
prob.set_initial_guesses()

prob.run_aviary_problem()

Aviary Version

0.9.4-dev

Relevant environment information

No response