Modelling Vehicle Deceleration in Simulink: Adding Drag Force Considerations

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Davieslad
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Homework Statement



right, I am modelling the deceleration of a vehicle in simulink

the vehicle uses wheel brakes, and a parachute to decellerate from Vmax to zero

I have constructed a model which models the constant force of the brakes to decelerate the vehicle to stop

I need to amend the model, so that the velocity dependent drag force produced by the parachute, and the drag of the vehicle itself are taken into account.

I am ignoring any turbulence produced

Homework Equations



Fd=0.5CdpAu^2

where
Cd is the drag coefficient of the parachute or car
p is the density
A is the frontal area of the parachute or car
u is the velocity

The Attempt at a Solution



so far as said above, i have the deceleration from the wheel brakes, shown here:
Simulink block diagram titled wheels: constant Wheel Brakes (Fw) block at -7000 and Mass (M) block at 2000 feed a product block labelled d, whose output goes to integrator 1/s labelled V and then 1/s labelled S, with scopes Deceleration, Velocity and Distance.


what type of block do i need to use to add the variable drag force to this system?

Many Thanks
Ed
 

Discussion



Ok, please ignore this - i figured out how to do it...