High-quality simulation of vehicle vibration can only be done with three-dimensional models.
Since the equations of motion for systems with many degrees of freedom can be derived from
computerized algorithms, a good approximation to real vehicle dynamics is possible. However, a
detailed analysis of the ride performance limitations of active and passive suspension systems
needs detailed road modeling analysis and the performance indexes employed in optimal control
laws require road elevations to be known. Thus, it is important to predict vehicle dynamic
response using realistic road models.