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[Solved] A little matlab help needed

  1. Mar 16, 2009 #1
    1. The problem statement, all variables and given/known data

    right, im 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

    2. Relevant 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

    3. The attempt at a solution

    so far as said above, i have the deceleration from the wheel brakes, shown here:
    wheelspic.jpg

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

    Many Thanks
    Ed
     
  2. jcsd
  3. Mar 16, 2009 #2
    Re: A little matlab help needed

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