Source code for fastoad.models.performances.mission.segments.transition

"""Class for very simple transition in some flight phases."""
#  This file is part of FAST-OAD : A framework for rapid Overall Aircraft Design
#  Copyright (C) 2022 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
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from copy import deepcopy
from dataclasses import dataclass

import pandas as pd

from fastoad.model_base import FlightPoint
from fastoad.models.performances.mission.segments.base import (

[docs]@dataclass class DummyTransitionSegment(AbstractFlightSegment, mission_file_keyword="transition"): """ Computes a transient flight part in a very quick and dummy way. :meth:`compute_from` will return only 2 or 3 flight points. The second flight point is the end of transition. Its parameters are equal to those provided in :attr:``. There is an exception if target does not specify any mass (i.e. == 0). Then the mass of the second flight point is the start mass multiplied by :attr:`mass_ratio`. If :attr:`reserve_mass_ratio` is non-zero, a third flight point is added, with parameters equal to flight_point(2), except for mass where: mass(2) - reserve_mass_ratio * mass(3) = mass(3). In different words, mass(3) would be the Zero Fuel Weight (ZFW) and reserve can be expressed as a percentage of ZFW. """ #: The ratio (aircraft mass at END of segment)/(aircraft mass at START of segment) mass_ratio: float = 1.0 #: The ratio (fuel mass)/(aircraft mass at END of segment) that will be consumed at end #: of segment. reserve_mass_ratio: float = 0.0
[docs] def compute_from_start_to_target(self, start: FlightPoint, target: FlightPoint) -> pd.DataFrame: end = deepcopy(target) = if end.mass is None: end.mass = start.mass * self.mass_ratio self.complete_flight_point_from(end, start) self.complete_flight_point(end) flight_points = [start, end] if self.reserve_mass_ratio > 0.0: reserve = deepcopy(end) reserve.mass = end.mass / (1.0 + self.reserve_mass_ratio) flight_points.append(reserve) return pd.DataFrame(flight_points)