RCAIDE.Library.Mission.Segments.Single_Point.Set_Speed_Set_Altitude.initialize_conditions

initialize_conditions(segment)

Initializes conditions for fixed speed and altitude analysis

Parameters:

segment (Segment) –

The mission segment being analyzed

• altitudefloat

  Flight altitude [m]

• air_speedfloat

  True airspeed [m/s]

• sideslip_anglefloat

  Aircraft sideslip angle [rad]

• linear_acceleration_xfloat

  Acceleration in x-direction [m/s^2]

• linear_acceleration_yfloat

  Acceleration in y-direction [m/s^2]

• linear_acceleration_zfloat

  Acceleration in z-direction [m/s^2]

• roll_ratefloat

  Aircraft roll rate [rad/s]

• pitch_ratefloat

  Aircraft pitch rate [rad/s]

• yaw_ratefloat

  Aircraft yaw rate [rad/s]

• state:

  conditionsData

  State conditions container

  initialsData, optional

  Initial conditions from previous segment

Returns:

Updates segment conditions directly:

• conditions.freestream.altitude [m]

• conditions.frames.inertial.position_vector [m]

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

• conditions.frames.inertial.acceleration_vector [m/s^2]

• conditions.static_stability.roll_rate [rad/s]

• conditions.static_stability.pitch_rate [rad/s]

• conditions.static_stability.yaw_rate [rad/s]

Return type:

None

Notes

This function sets up the initial conditions for a single point analysis with fixed speed and altitude. It includes both linear and angular motion states for general flight dynamics analysis.

Calculation Process

1. Check initial conditions

2. Decompose velocity into components using sideslip angle:

   • v_x = V * cos(β)

   • v_y = V * sin(β)

   where:

   • V is true airspeed

   • β is sideslip angle

3. Set position and altitude

4. Set acceleration vector

5. Set angular rates

Major Assumptions

• Fixed speed and altitude point

• Small angle approximations

• No atmospheric variations

• Quasi-steady state

See also

RCAIDE.Framework.Mission.Segments