.PlanarMechanics.VehicleComponents.AirResistanceLongitudinal

Information

The vehicle's air drag, resolved in frame_a, is calculated as:

fDrag = ( c_W *  area * rho * v_x^2 ) / 2

where:

c_W           : air drag coefficient,
area          : cross area of vehicle,
rho           : density of the air,
v_x = vAir[1] : longitudinal component of air velocity, resolved in frame_a.

Just air drag in vehicle's longitudinal direction is calculated here, which can be specified for frame_a.phi = 0 by the parameter r. For example for r = {1, 0} the driving direction is in x-direction of frame_a and, thus, frame_a.fx = fDrag. The other forces and torque are disregarded.

Note

This model is limited to negative air velocity v_x only. For positive velocity, which can occur e.g. when driving rearwards, the air drag is set to zero.

Revisions

Developed 2022 at the DLR Institute of System Dynamics and Control