"""Main components for mass breakdown."""
# This file is part of FAST-OAD : A framework for rapid Overall Aircraft Design
# Copyright (C) 2021 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 openmdao.api as om
from fastoad.models.constants import PAYLOAD_FROM_NPAX
from fastoad.module_management.service_registry import RegisterSubmodel
from .constants import (
SERVICE_AIRFRAME_MASS,
SERVICE_CREW_MASS,
SERVICE_FURNITURE_MASS,
SERVICE_OWE,
SERVICE_PAYLOAD_MASS,
SERVICE_PROPULSION_MASS,
SERVICE_SYSTEMS_MASS,
)
from .update_mlw_and_mzfw import UpdateMLWandMZFW
from ..constants import SERVICE_MASS_BREAKDOWN
[docs]@RegisterSubmodel(SERVICE_MASS_BREAKDOWN, "fastoad.submodel.weight.mass.legacy")
class MassBreakdown(om.Group):
"""
Computes analytically the mass of each part of the aircraft, and the resulting sum,
the Overall Weight Empty (OWE).
Some models depend on MZFW (Max Zero Fuel Weight), MLW (Max Landing Weight) and
MTOW (Max TakeOff Weight), which depend on OWE.
This model cycles for having consistent OWE, MZFW and MLW.
Options:
- payload_from_npax: If True (default), payload masses will be computed from NPAX, if False
design payload mass and maximum payload mass must be provided.
"""
[docs] def initialize(self):
self.options.declare(PAYLOAD_FROM_NPAX, types=bool, default=True)
[docs] def setup(self):
if self.options[PAYLOAD_FROM_NPAX]:
self.add_subsystem(
"payload", RegisterSubmodel.get_submodel(SERVICE_PAYLOAD_MASS), promotes=["*"]
)
self.add_subsystem("owe", RegisterSubmodel.get_submodel(SERVICE_OWE), promotes=["*"])
self.add_subsystem("update_mzfw_and_mlw", UpdateMLWandMZFW(), promotes=["*"])
# Solvers setup
self.nonlinear_solver = om.NonlinearBlockGS()
self.nonlinear_solver.options["iprint"] = 0
self.nonlinear_solver.options["maxiter"] = 50
self.linear_solver = om.LinearBlockGS()
self.linear_solver.options["iprint"] = 0
[docs]@RegisterSubmodel(SERVICE_OWE, "fastoad.submodel.weight.mass.owe.legacy")
class OperatingWeightEmpty(om.Group):
"""Operating Empty Weight (OEW) estimation.
This group aggregates weight from all components of the aircraft.
"""
[docs] def setup(self):
# Propulsion should be done before airframe, because it drives pylon mass.
self.add_subsystem(
"propulsion_weight",
RegisterSubmodel.get_submodel(SERVICE_PROPULSION_MASS),
promotes=["*"],
)
self.add_subsystem(
"airframe_weight", RegisterSubmodel.get_submodel(SERVICE_AIRFRAME_MASS), promotes=["*"],
)
self.add_subsystem(
"systems_weight", RegisterSubmodel.get_submodel(SERVICE_SYSTEMS_MASS), promotes=["*"]
)
self.add_subsystem(
"furniture_weight",
RegisterSubmodel.get_submodel(SERVICE_FURNITURE_MASS),
promotes=["*"],
)
self.add_subsystem(
"crew_weight", RegisterSubmodel.get_submodel(SERVICE_CREW_MASS), promotes=["*"]
)
weight_sum = om.AddSubtractComp()
weight_sum.add_equation(
"data:weight:aircraft:OWE",
[
"data:weight:airframe:mass",
"data:weight:propulsion:mass",
"data:weight:systems:mass",
"data:weight:furniture:mass",
"data:weight:crew:mass",
],
units="kg",
desc="Mass of crew",
)
self.add_subsystem("OWE_sum", weight_sum, promotes=["*"])