"""Class for takeoff sequence"""
# This file is part of FAST-OAD : A framework for rapid Overall Aircraft Design
# Copyright (C) 2023 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/>.
from dataclasses import dataclass
import numpy as np
from fastoad.model_base import FlightPoint
from fastoad.model_base.datacls import MANDATORY_FIELD
from fastoad.models.performances.mission.segments.base import RegisterSegment
from fastoad.models.performances.mission.segments.macro_segments import MacroSegmentMeta
from .end_of_takeoff import EndOfTakeoffSegment
from .rotation import RotationSegment
from ..ground_speed_change import GroundSpeedChangeSegment
[docs]@RegisterSegment("takeoff")
@dataclass
class TakeOffSequence(
metaclass=MacroSegmentMeta,
cls_sequence=[GroundSpeedChangeSegment, RotationSegment, EndOfTakeoffSegment],
):
"""
This class does a time-step simulation of a full takeoff:
- ground speed acceleration up to :attr:`rotation_equivalent_airspeed`
- rotation
- climb up to altitude provided in :attr:`target` (safety altitude)
"""
#: Equivalent airspeed to reach for starting aircraft rotation.
rotation_equivalent_airspeed: float = MANDATORY_FIELD
#: Angle of attack (in radians) where tail strike is expected. Default value
#: is good for SMR aircraft.
rotation_alpha_limit: float = np.radians(13.5)
# Used time step for computing the takeoff part after rotation.
end_time_step: float = 0.05
[docs] def build_sequence(self):
"""
Instantiates all segments, using dataclass field values of this macro-segment.
Note: this method is called each time a dataclass field value is modified.
"""
super().build_sequence()
ground, rotation, end = self[:]
ground.target = FlightPoint(equivalent_airspeed=self.rotation_equivalent_airspeed)
rotation.target = FlightPoint()
rotation.rotation_rate = self.rotation_rate
rotation.alpha_limit = self.rotation_alpha_limit
end.time_step = self.end_time_step