fastoad.models.performances.mission.segments.registered.takeoff.rotation module

Classes for acceleration/deceleration segments.

class fastoad.models.performances.mission.segments.registered.takeoff.rotation.RotationSegment(name: str = '', target: ~fastoad.model_base.flight_point.FlightPoint = <object object>, isa_offset: float = 0.0, propulsion: ~fastoad.model_base.propulsion.IPropulsion = <object object>, polar: ~fastoad.models.performances.mission.polar.Polar = <object object>, polar_modifier: ~fastoad.models.performances.mission.polar_modifier.AbstractPolarModifier = <factory>, reference_area: float = <object object>, time_step: float = 0.1, maximum_CL: float = None, altitude_bounds: tuple = (-500.0, 40000.0), mach_bounds: tuple = (-1e-06, 5.0), interrupt_if_getting_further_from_target: bool = True, engine_setting: ~fastoad.constants.EngineSetting = EngineSetting.CLIMB, thrust_rate: float = 1.0, wheels_friction: float = 0.03, rotation_rate: float = 0.05235987755982989, alpha_limit: float = 0.23561944901923448)[source]

Bases: AbstractGroundSegment

Computes a flight path segment with constant rotation rate while on ground and accelerating.

The target is the lift-off. A protection is included is the aircraft reaches alpha_limit (tail-strike).

rotation_rate: float = 0.05235987755982989

Rotation rate in radians/s, i.e. derivative of angle of attack. Default value is CS-25 specification.

alpha_limit: float = 0.23561944901923448

Angle of attack (in radians) where tail strike is expected. Default value is good for SMR aircraft.

get_distance_to_target(flight_points: List[FlightPoint], target: FlightPoint) → float[source]

Computes a “distance” from last flight point to target.

Computed does not need to have a real meaning. The important point is that it must be signed so that algorithm knows on which “side” of the target we are. And of course, it should be 0. if flight point is on target.

Parameters:

  • flight_points – list of all currently computed flight_points

  • target – segment target (will not contain relative values)

Returns:

  1. if target is attained, a non-null value otherwise

get_next_alpha(previous_point: FlightPoint, time_step: float) → float[source]

Determine the next AoA based on imposed rotation rate.

Parameters:

  • previous_point – the flight point from which next alpha is computed

  • time_step – the duration between computed flight point and previous_point

property target: FlightPoint

The base class of the class hierarchy.

When called, it accepts no arguments and returns a new featureless instance that has no instance attributes and cannot be given any.