Abstract
This paper deals with improving the riding quality of heavy-duty tractor-trailer. It is constructed that a half truck model of 9 degrees freedom. The influence is discussed which of the parameters of cab suspension on the riding quality of truck. It is done that the simulation of step response and random response with cab semi-active suspension damping control. It shows that the riding quality of truck is improved with the adjustment of cab stiffness and cab semi-active suspension damping control.
