Source code for RCAIDE.Framework.Mission.Segments.Ground.Ground
# RCAIDE/Framework/Analyses/Mission/Segments/Ground/Ground.py
#
#
# Created: Jul 2023, M. Clarke
# ----------------------------------------------------------------------------------------------------------------------
# IMPORT
# ----------------------------------------------------------------------------------------------------------------------
# RCAIDE imports
from RCAIDE.Framework.Core import Units , Data
from RCAIDE.Framework.Mission.Segments.Evaluate import Evaluate
from RCAIDE.Library.Mission.Common import Residuals , Unpack_Unknowns, Update
# ----------------------------------------------------------------------------------------------------------------------
# Ground
# ----------------------------------------------------------------------------------------------------------------------
[docs]
class Ground(Evaluate):
""" Base segment for takeoff and landing segments. Integrates equations of motion
including rolling friction.
Assumptions:
Notes Regarding Friction Coefficients
Dry asphalt or concrete: .04 brakes off, .4 brakes on
Wet asphalt or concrete: .05 brakes off, .225 brakes on
Icy asphalt or concrete: .02 brakes off, .08 brakes on
Hard turf: .05 brakes off, .4 brakes on
Firm dirt: .04 brakes off, .3 brakes on
Soft turf: .07 brakes off, .2 brakes on
Wet grass: .08 brakes off, .2 brakes on
Source: General Aviation Aircraft Design: Applied Methods and Procedures,
by Snorri Gudmundsson, copyright 2014, published by Elsevier, Waltham,
MA, USA [p.938]
"""
def __defaults__(self):
""" This sets the default solver flow. Anything in here can be modified after initializing a segment.
Assumptions:
None
Source:
N/A
Inputs:
None
Outputs:
None
Properties Used:
None
"""
# --------------------------------------------------------------------------------------------------------------
# User Inputs
# --------------------------------------------------------------------------------------------------------------
self.ground_incline = 0.0
self.friction_coefficient = 0.04
self.throttle = None
self.velocity_start = 0.0
self.velocity_end = 0.0
self.altitude = 0.0
self.true_course = 0.0 * Units.degrees
# --------------------------------------------------------------------------------------------------------------
# Mission Conditions
# --------------------------------------------------------------------------------------------------------------
ones_row = self.state.ones_row
self.state.conditions.ground = Data()
self.state.conditions.ground.incline = ones_row(1) * 0.0
self.state.conditions.ground.friction_coefficient = ones_row(1) * 0.0
self.state.conditions.frames.inertial.ground_force_vector = ones_row(3) * 0.0
# --------------------------------------------------------------------------------------------------------------
# Mission Specific Unknowns and Residuals
# --------------------------------------------------------------------------------------------------------------
iterate.unknowns.mission = Unpack_Unknowns.ground
iterate.residuals.flight_dynamics = Residuals.flight_dynamics
# --------------------------------------------------------------------------------------------------------------
# Mission specific processes
# --------------------------------------------------------------------------------------------------------------
iterate = self.process.iterate
iterate.conditions.forces_ground = Update.ground_forces
return
