"""
Mission wrapper.
"""
# 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/>.
from typing import Dict, Tuple
import numpy as np
import openmdao.api as om
import pandas as pd
from openmdao.vectors.vector import Vector
from fastoad.model_base import FlightPoint
from fastoad.models.aerodynamics.constants import POLAR_POINT_COUNT
from ..base import FlightSequence
from ..mission_definition.mission_builder import MissionBuilder
from ..mission_definition.schema import (
CLIMB_PARTS_TAG,
DESCENT_PARTS_TAG,
MISSION_DEFINITION_TAG,
PARTS_TAG,
PHASE_TAG,
RESERVE_TAG,
ROUTE_DEFINITIONS_TAG,
ROUTE_TAG,
)
BASE_UNITS = {
"altitude": "m",
"true_airspeed": "m/s",
"equivalent_airspeed": "m/s",
"range": "m",
"time": "s",
"ground_distance": "m",
}
[docs]class MissionWrapper(MissionBuilder):
"""
Wrapper around
:class:`~fastoad.models.performances.mission.mission_definition.mission_builder.MissionBuilder`
for using with OpenMDAO.
"""
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.mission_name = None
[docs] def setup(self, component: om.ExplicitComponent, mission_name: str = None):
"""
To be used during setup() of provided OpenMDAO component.
It adds input and output variables deduced from mission definition file.
:param component: the OpenMDAO component where the setup is done.
:param mission_name: mission name (can be omitted if only one mission is defined)
"""
if mission_name is None:
mission_name = self.get_unique_mission_name()
self.mission_name = mission_name
input_definition = self.get_input_variables(mission_name)
output_definition = self._identify_outputs()
output_definition = {
name: value for name, value in output_definition.items() if name not in input_definition
}
for name, (units, desc) in input_definition.items():
if name.endswith(":CD") or name.endswith(":CL"):
component.add_input(name, np.nan, shape=POLAR_POINT_COUNT, desc=desc)
else:
component.add_input(name, np.nan, units=units, desc=desc)
for name, (units, desc) in output_definition.items():
component.add_output(name, units=units, desc=desc)
[docs] def compute(
self, inputs: Vector, outputs: Vector, start_flight_point: FlightPoint
) -> pd.DataFrame:
"""
To be used during compute() of an OpenMDAO component.
Builds the mission from input file, and computes it. `outputs` vector is
filled with duration, burned fuel and covered ground distance for each
part of the flight.
:param inputs: the input vector of the OpenMDAO component
:param outputs: the output vector of the OpenMDAO component
:param start_flight_point: the starting flight point just after takeoff
:return: a pandas DataFrame where columns names match fields of
:class:`~fastoad.model_base.flight_point.FlightPoint`
"""
mission = self.build(inputs, self.mission_name)
def _compute_vars(name_root, start: FlightPoint, end: FlightPoint):
"""Computes duration, burned fuel and covered distance."""
if name_root + ":duration" in outputs:
outputs[name_root + ":duration"] = end.time - start.time
if name_root + ":fuel" in outputs:
outputs[name_root + ":fuel"] = start.mass - end.mass
if name_root + ":distance" in outputs:
outputs[name_root + ":distance"] = end.ground_distance - start.ground_distance
if not start_flight_point.name:
start_flight_point.name = mission.flight_sequence[0].name
current_flight_point = start_flight_point
flight_points = mission.compute_from(start_flight_point)
for part in mission.flight_sequence:
var_name_root = "data:mission:%s" % part.name
part_end = FlightPoint.create(
flight_points.loc[flight_points.name.str.startswith(part.name)].iloc[-1]
)
_compute_vars(var_name_root, current_flight_point, part_end)
if isinstance(part, FlightSequence):
# In case of a route, outputs are computed for each phase in the route
phase_start = current_flight_point
for phase in part.flight_sequence:
phase_points = flight_points.loc[flight_points.name == phase.name]
if len(phase_points) > 0:
phase_end = FlightPoint.create(phase_points.iloc[-1])
var_name_root = "data:mission:%s" % phase.name
_compute_vars(var_name_root, phase_start, phase_end)
phase_start = phase_end
current_flight_point = part_end
# Outputs for the whole mission
var_name_root = "data:mission:%s" % mission.name
_compute_vars(var_name_root, start_flight_point, current_flight_point)
return flight_points
[docs] def get_reserve_variable_name(self) -> str:
"""
:return: the name of OpenMDAO variable for fuel reserve. This name is among the declared
outputs in :meth:`setup`.
"""
return "data:mission:%s:reserve:fuel" % self.mission_name
def _identify_outputs(self) -> Dict[str, Tuple[str, str]]:
"""
Builds names of OpenMDAO outputs from names of mission, route and phases.
:return: dictionary with variable name as key and unit, description as value
"""
output_definition = {}
output_definition.update(self._add_vars(self.mission_name))
for part in self.definition[MISSION_DEFINITION_TAG][self.mission_name][PARTS_TAG]:
if PHASE_TAG in part:
phase_name = part[PHASE_TAG]
output_definition.update(self._add_vars(self.mission_name, phase_name=phase_name))
elif ROUTE_TAG in part:
route_name = part[ROUTE_TAG]
output_definition.update(self._add_vars(self.mission_name, route_name))
route_definition = self.definition[ROUTE_DEFINITIONS_TAG][route_name]
for part_definition in list(
route_definition[CLIMB_PARTS_TAG] + route_definition[DESCENT_PARTS_TAG]
):
phase_name = part_definition[PHASE_TAG]
output_definition.update(
self._add_vars(self.mission_name, route_name, phase_name)
)
output_definition.update(self._add_vars(self.mission_name, route_name, "cruise"))
elif RESERVE_TAG in part:
output_definition[self.get_reserve_variable_name()] = (
"kg",
'reserve fuel for mission "%s"' % self.mission_name,
)
return output_definition
@staticmethod
def _add_vars(mission_name, route_name=None, phase_name=None) -> dict:
"""
Builds names of OpenMDAO outputs for provided mission, route and phase names.
:param mission_name:
:param route_name:
:param phase_name:
:return: dictionary with variable name as key and unit, description as value
"""
output_definition = {}
name_root = ":".join(
name for name in ["data:mission", mission_name, route_name, phase_name] if name
)
if route_name and phase_name:
flight_part_desc = 'phase "%s" of route "%s" in mission "%s"' % (
phase_name,
route_name,
mission_name,
)
elif route_name:
flight_part_desc = 'route "%s" in mission "%s"' % (route_name, mission_name,)
elif phase_name:
flight_part_desc = 'phase "%s" in mission "%s"' % (phase_name, mission_name,)
else:
flight_part_desc = 'mission "%s"' % (mission_name,)
output_definition[name_root + ":duration"] = ("s", "duration of %s" % flight_part_desc)
output_definition[name_root + ":fuel"] = (
"kg",
"burned fuel during %s" % flight_part_desc,
)
output_definition[name_root + ":distance"] = (
"m",
"covered ground distance during %s" % flight_part_desc,
)
return output_definition