def compute_next_flight_point(
self, flight_points: List[FlightPoint], time_step: float
) -> FlightPoint:
"""
Computes time, altitude, speed, mass and ground distance of next flight point.
:param flight_points: previous flight points
:param time_step: time step for computing next point
:return: the computed next flight point
"""
start = flight_points[0]
previous = flight_points[-1]
next_point = FlightPoint()
next_point.mass = previous.mass - self.propulsion.get_consumed_mass(previous, time_step)
next_point.time = previous.time + time_step
next_point.ground_distance = (
previous.ground_distance
+ previous.true_airspeed * time_step * np.cos(previous.slope_angle)
)
self._compute_next_altitude(next_point, previous)
if self.target.true_airspeed == "constant":
next_point.true_airspeed = previous.true_airspeed
elif self.target.equivalent_airspeed == "constant":
next_point.equivalent_airspeed = start.equivalent_airspeed
elif self.target.mach == "constant":
next_point.mach = start.mach
else:
next_point.true_airspeed = previous.true_airspeed + time_step * previous.acceleration
# The naming is not done in complete_flight_point for not naming the start point
next_point.name = self.name
return next_point
def _complete_speed_values(flight_point: FlightPoint):
"""
Computes consistent values between TAS, EAS and Mach, assuming one of them is defined.
"""
atm = AtmosphereSI(flight_point.altitude)
if flight_point.true_airspeed is None:
if flight_point.mach is not None:
flight_point.true_airspeed = flight_point.mach * atm.speed_of_sound
elif flight_point.equivalent_airspeed is not None:
flight_point.true_airspeed = atm.get_true_airspeed(
flight_point.equivalent_airspeed)
else:
raise FastFlightSegmentIncompleteFlightPoint(
"Flight point should be defined for true_airspeed, "
"equivalent_airspeed, or mach.")
if flight_point.mach is None:
flight_point.mach = flight_point.true_airspeed / atm.speed_of_sound
if flight_point.equivalent_airspeed is None:
flight_point.equivalent_airspeed = atm.get_equivalent_airspeed(
flight_point.true_airspeed)
