Abstract
This paper deals with improving the ride comfort of heavy-duty tractor semi-trailer. It is constructed that a half truck model of 12 degrees freedom included driver human body-seat model. The influence is discussed which of the parameters of seat cushion and seat suspension on the ride comfort of truck. It is done that the simulation of road random response with seat semi-active suspension damping control. It shows that the ride comfort of tractor semi-trailer is improved with damping control seat semi-active suspension.
