"""
Python module for propulsion system mass calculation,
part of the Operating Empty Weight (OEW) estimation.
"""
# This file is part of FAST-OAD_CS23 : A framework for rapid Overall Aircraft Design
# Copyright (C) 2025 ONERA & ISAE-SUPAERO
# FAST is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
import fastoad.api as oad
import openmdao.api as om
from .constants import (
SERVICE_INSTALLED_ENGINE_MASS,
SERVICE_FUEL_SYSTEM_MASS,
SERVICE_UNUSABLE_FUEL_MASS,
)
from ..constants import SERVICE_PROPULSION_MASS, SUBMODEL_PROPULSION_MASS_LEGACY
[docs]@oad.RegisterSubmodel(SERVICE_PROPULSION_MASS, SUBMODEL_PROPULSION_MASS_LEGACY)
class PropulsionWeight(om.Group):
"""Computes mass of propulsion system."""
[docs] def initialize(self):
self.options.declare("propulsion_id", default="", types=str)
[docs] def setup(self):
propulsion_option = {"propulsion_id": self.options["propulsion_id"]}
self.add_subsystem(
"engine_weight",
oad.RegisterSubmodel.get_submodel(
SERVICE_INSTALLED_ENGINE_MASS, options=propulsion_option
),
promotes=["*"],
)
self.add_subsystem(
"unusable_fuel",
oad.RegisterSubmodel.get_submodel(
SERVICE_UNUSABLE_FUEL_MASS, options=propulsion_option
),
promotes=["*"],
)
self.add_subsystem(
"fuel_lines_weight",
oad.RegisterSubmodel.get_submodel(SERVICE_FUEL_SYSTEM_MASS),
promotes=["*"],
)
weight_sum = om.AddSubtractComp()
weight_sum.add_equation(
"data:weight:propulsion:mass",
["data:weight:propulsion:engine:mass", "data:weight:propulsion:fuel_lines:mass"],
units="kg",
desc="Mass of the propulsion system",
)
self.add_subsystem("propulsion_weight_sum", weight_sum, promotes=["*"])