Modelling Vehicle Deceleration in Simulink: Adding Drag Force Considerations

[Davieslad]

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 dependant 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:

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

Many Thanks
Ed

 

[Davieslad]

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

 

[nlightner]

I would suggest using a "Force" block in Simulink to add the variable drag force to the system. This block allows you to input a mathematical function, in this case the equation for drag force, and apply it to the overall system. You can also specify the variables to be used in the equation, such as the drag coefficient, density, frontal area, and velocity. By incorporating this block into your model, you will be able to accurately simulate the deceleration of the vehicle taking into account the drag force from the parachute and the vehicle itself. Additionally, you may want to consider adding a "Scope" block to your model to visualize and analyze the effects of the drag force on the deceleration of the vehicle.