The results obtained from three mathematical models, of varying degrees of complexity, describing the motion of a tractor-semitrailer unit are presented. These results, given in the form of curves, indicate the steady state response of the vehicle to a sinusoidal input profile at the tire contact points for a range of input frequencies.
A comparison of the results of the different models indicates that in certain circumstances a relatively simple model may provide adequate information for particular design purposes. The simplification of the model reduces the computer time required, and the cost, and possibly will allow the analysis to be carried out on a computer with a limited capacity.
