"""
Estimation of vertical tail sweeps
"""
# 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 math
import numpy as np
from openmdao.core.explicitcomponent import ExplicitComponent
# TODO: HT and VT components are similar --> factorize
[docs]class ComputeVTSweep(ExplicitComponent):
# TODO: Document equations. Cite sources
""" Vertical tail sweeps estimation """
[docs] def setup(self):
self.add_input("data:geometry:vertical_tail:span", val=np.nan, units="m")
self.add_input("data:geometry:vertical_tail:root:chord", val=np.nan, units="m")
self.add_input("data:geometry:vertical_tail:tip:chord", val=np.nan, units="m")
self.add_input("data:geometry:vertical_tail:sweep_25", val=np.nan, units="deg")
self.add_output("data:geometry:vertical_tail:sweep_0", units="deg")
self.add_output("data:geometry:vertical_tail:sweep_100", units="deg")
[docs] def setup_partials(self):
self.declare_partials("data:geometry:vertical_tail:sweep_0", "*", method="fd")
self.declare_partials("data:geometry:vertical_tail:sweep_100", "*", method="fd")
[docs] def compute(self, inputs, outputs):
root_chord = inputs["data:geometry:vertical_tail:root:chord"]
tip_chord = inputs["data:geometry:vertical_tail:tip:chord"]
sweep_25_vt = inputs["data:geometry:vertical_tail:sweep_25"]
b_v = inputs["data:geometry:vertical_tail:span"]
sweep_0_vt = (
(
math.pi / 2
- math.atan(
b_v
/ (
0.25 * root_chord
- 0.25 * tip_chord
+ b_v * math.tan(sweep_25_vt / 180.0 * math.pi)
)
)
)
/ math.pi
* 180.0
)
sweep_100_vt = (
(
math.pi / 2
- math.atan(
b_v
/ (
b_v * math.tan(sweep_25_vt / 180.0 * math.pi)
- 0.75 * root_chord
+ 0.75 * tip_chord
)
)
)
/ math.pi
* 180.0
)
outputs["data:geometry:vertical_tail:sweep_0"] = sweep_0_vt
outputs["data:geometry:vertical_tail:sweep_100"] = sweep_100_vt