Abstract
Providing acceptable ride quality of heavy -duty trucks is essential to their viability in the freight transport business. This paper deals with improving the ride comfort of heavy -duty trucks. The vertical vibration of heavy-duty trucks has several natural frequencies in the range which influences ride quality significantly. Bending vibration of the frame, which is called beaming, is one of the detrimental sources that cause the vertical vibration. In this paper, a half truck model of
14 degrees freedom including the beaming is constructed. It is discussed that the influence of the parameters of cab suspension on the ride quality of truck. The simulation is done which of frequency response under road random profile input with damping control semi-active cab suspension. The simulation shows that the ride comfort of truck is improved with the damping control semi-active cab suspension.