"""
Payload mass computation
"""
# 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 numpy as np
from openmdao import api as om
[docs]class ComputePayload(om.ExplicitComponent):
""" Computes payload from NPAX """
[docs] def setup(self):
self.add_input("data:TLAR:NPAX", val=np.nan)
self.add_input(
"settings:weight:aircraft:payload:design_mass_per_passenger",
val=90.72,
units="kg",
desc="Design value of mass per passenger",
)
self.add_input(
"settings:weight:aircraft:payload:max_mass_per_passenger",
val=130.72,
units="kg",
desc="Maximum value of mass per passenger",
)
self.add_output("data:weight:aircraft:payload", units="kg")
self.add_output("data:weight:aircraft:max_payload", units="kg")
[docs] def setup_partials(self):
self.declare_partials("*", "*", method="fd")
[docs] def compute(self, inputs, outputs, discrete_inputs=None, discrete_outputs=None):
npax = inputs["data:TLAR:NPAX"]
mass_per_pax = inputs["settings:weight:aircraft:payload:design_mass_per_passenger"]
max_mass_per_pax = inputs["settings:weight:aircraft:payload:max_mass_per_passenger"]
outputs["data:weight:aircraft:payload"] = npax * mass_per_pax
outputs["data:weight:aircraft:max_payload"] = npax * max_mass_per_pax