DBump:

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   Model of a quarter automobile model for the suspension with a hydraulic
   actuator.
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   Form:
   r = DBump( t, d )
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   ------
   Inputs
   ------
   t           (1,1) Time
   d           (1,1) data structure
                     .aBump   (1,1) Bump amplitude (m)
                     .wBump   (1,1) Bump frequency (rad/sec)
   -------
   Outputs
   -------
   r           (1,1) Bump

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