"""
Estimation of cargo configuration weight
"""
# 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
import openmdao.api as om
[docs]class CargoConfigurationWeight(om.ExplicitComponent):
"""
Weight estimation for equipments for freight transport (applies only for freighters)
Based on :cite:`supaero:2014`, mass contribution D1
"""
[docs] def setup(self):
self.add_input("data:geometry:cabin:NPAX1", val=np.nan)
self.add_input("data:geometry:cabin:containers:count", val=np.nan)
self.add_input("data:geometry:cabin:pallet_count", val=np.nan)
self.add_input("data:geometry:cabin:seats:economical:count_by_row", val=np.nan)
self.add_input("tuning:weight:furniture:cargo_configuration:mass:k", val=1.0)
self.add_input(
"tuning:weight:furniture:cargo_configuration:mass:offset", val=0.0, units="kg"
)
self.add_output("data:weight:furniture:cargo_configuration:mass", units="kg")
[docs] def setup_partials(self):
self.declare_partials("*", "*", method="fd")
[docs] def compute(self, inputs, outputs, discrete_inputs=None, discrete_outputs=None):
npax1 = inputs["data:geometry:cabin:NPAX1"]
side_by_side_eco_seat_count = inputs["data:geometry:cabin:seats:economical:count_by_row"]
container_count = inputs["data:geometry:cabin:containers:count"]
pallet_number = inputs["data:geometry:cabin:pallet_count"]
k_d1 = inputs["tuning:weight:furniture:cargo_configuration:mass:k"]
offset_d1 = inputs["tuning:weight:furniture:cargo_configuration:mass:offset"]
if side_by_side_eco_seat_count <= 6.0:
temp_d1 = 0.351 * (npax1 - 38)
else:
temp_d1 = 85 * container_count + 110 * pallet_number
outputs["data:weight:furniture:cargo_configuration:mass"] = k_d1 * temp_d1 + offset_d1