break frequency of the phase lead term p1 and p2 are the break frequencies of the phase lag terms u03c4 is the reciprocal of the break frequency of a phase lead term and u03c9 is the natural frequency and u03be the damping ratio of a second order rolloff these transfer functions would be stored in microprocessor 40 other transfer functions for other desirable frequency shaping characteristics could be stored in microprocessor 40 the output of blocks 100 and 102 are combined to form an output 106 which is applied to the basic control law block 88 in fig5 applying these frequency shaping characteristics to the vehicle control law dynamic equations enables the characteristic curve between hub damping and body load as shown in fig1 to have a more desirable impact harshness as can be seen in fig1 line c represents the response curve between hub damping and body load of a suspension system according to a preferred embodiment of this invention incorporating an isolator bushing 20 having a stiffness which is relatively soft or has lower damping as is apparent the harshness of the system has been reduced from prior art active suspension systems as shown by line a incorporation of a stiffer isolator bushing 50 stiffer than line c which is comparable to a passive suspension bushing can realize performance characteristics as shown on line d as is apparent the impact harshness has been reduced to a degree which is even less than that of the passive system represented by line b the foregoing discussion discloses and describes a merely exemplary embodiment of the present invention one skilled in the art will readily recognize from such discussion and.