RCAIDE.Library.Mission.Segments.Descent.Constant_CAS_Constant_Rate.initialize_conditions#
- initialize_conditions(segment)[source]#
Initializes conditions for constant calibrated airspeed descent at fixed rate
- Parameters:
segment (Segment) –
- The mission segment being analyzed
- descent_ratefloat
Rate of descent [m/s]
- calibrated_air_speedfloat
Calibrated airspeed to maintain [m/s]
- altitude_startfloat
Initial altitude [m]
- altitude_endfloat
Final altitude [m]
- sideslip_anglefloat
Aircraft sideslip angle [rad]
- temperature_deviationfloat
Temperature offset from standard day [K]
- state:
- numerics.dimensionless.control_pointsarray
Discretization points [-]
- conditionsData
State conditions container
- analyses:
- atmosphereModel
Atmospheric model for property calculations
- Return type:
None
Notes
This function sets up the initial conditions for a descent segment with constant calibrated airspeed (CAS) and constant descent rate. It handles the conversion between CAS and true airspeed accounting for pressure and density variations with altitude. Updates segment conditions directly with velocity_vector [m/s], altitude [m], and position_vector [m].
- Calculation Process
Discretize altitude profile
Get atmospheric properties at each altitude
- Convert CAS to true airspeed using:
Pressure ratio (δ)
Compressibility effects
Equivalent airspeed (EAS) conversion
- Decompose velocity into components using:
Fixed descent rate
Sideslip angle
Computed true airspeed
- Major Assumptions
Constant calibrated airspeed
Constant descent rate
Standard atmosphere model with temperature deviation
Small angle approximations
Quasi-steady flight