RCAIDE.Library.Mission.Segments.Ground.Landing

Landing

Functions

initialize_conditions(segment)

Initializes conditions for aircraft landing segment

initialize_conditions(segment)

Initializes conditions for aircraft landing segment

Parameters:

segment (Segment) –

The mission segment being analyzed

• altitudefloat

  Ground altitude [m]

• velocity_startfloat

  Initial velocity at touchdown [m/s]

• velocity_endfloat

  Final velocity after landing roll [m/s]

• friction_coefficientfloat

  Ground friction coefficient [-]

• state:

  numerics:

  dimensionless:

  control_pointsarray

  Discretization points [-]

  conditionsData

  State conditions container

  unknowns:

  ground_velocityarray

  Ground velocity profile [m/s]

  initialsData, optional

  Initial conditions from previous segment

Returns:

Updates segment conditions directly:

• conditions.frames.inertial.velocity_vector [m/s]

• conditions.ground.friction_coefficient [-]

• conditions.freestream.altitude [m]

• conditions.frames.inertial.position_vector [m]

Return type:

None

Notes

This function sets up the initial conditions for a ground landing segment with deceleration from touchdown to final speed. The segment handles ground effects and friction during the landing roll.

Calculation Process

1. Check initial conditions

2. Initialize velocity profile:

   v = v0 + (vf - v0)*t where:

   • v0 is touchdown speed

   • vf is final speed

   • t is normalized time/distance

3. Set ground friction coefficient

4. Set position and altitude

Major Assumptions

• Constant friction coefficient

• Linear velocity decrease

• No bouncing or porpoising

• Quasi-steady deceleration

• Small minimum velocity for numerical stability

See also

RCAIDE.Framework.Mission.Segments