"""
Estimation of vertical tail distance
"""
# 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 ComputeVTDistance(om.ExplicitComponent):
# TODO: Document equations. Cite sources
""" Vertical tail distance estimation """
[docs] def setup(self):
self.add_input("data:geometry:fuselage:length", val=np.nan, units="m")
self.add_input("data:geometry:wing:MAC:at25percent:x", val=np.nan, units="m")
self.add_input("data:geometry:has_T_tail", val=np.nan)
self.add_output("data:geometry:vertical_tail:MAC:at25percent:x:from_wingMAC25", units="m")
[docs] def setup_partials(self):
self.declare_partials(
"data:geometry:vertical_tail:MAC:at25percent:x:from_wingMAC25",
["data:geometry:fuselage:length", "data:geometry:wing:MAC:at25percent:x"],
method="fd",
)
[docs] def compute(self, inputs, outputs, discrete_inputs=None, discrete_outputs=None):
tail_type = np.round(inputs["data:geometry:has_T_tail"])
fus_length = inputs["data:geometry:fuselage:length"]
fa_length = inputs["data:geometry:wing:MAC:at25percent:x"]
if tail_type == 1:
lp_vt = 0.93 * fus_length - fa_length
elif tail_type == 0:
lp_vt = 0.88 * fus_length - fa_length
else:
raise ValueError("Value of data:geometry:has_T_tail can only be 0 or 1")
outputs["data:geometry:vertical_tail:MAC:at25percent:x:from_wingMAC25"] = lp_vt