Abstract
A novel kinetic dynamic suspension (KDS) system is presented for the cooperative control of the roll and warp motion modes of off-road vehicles. The proposed KDS system consists of two hydraulic cylinders acting on the antiroll bars. Hence, the antiroll bars are not completely replaced by the hydraulic system, but both systems are installed. In this paper, the vibration analysis in terms of natural frequencies of different motion modes in frequency domain for an off-road vehicle equipped with different configurable suspension systems is studied by using the modal analysis method. The dynamic responses of the vehicle with different configurable suspension systems are investigated under different road excitations and maneuvers. The results of the modal and dynamic analysis prove that the KDS system can reduce the roll and articulation motions of the off-road vehicle without adding extra bounce stiffness and deteriorating the ride comfort. Furthermore, the roll stiffness is increased and the warp stiffness is decreased by the KDS system, which could significantly enhance handing performance and off-road capability.
Highlights
Vehicle suspension system has always been considered as an essential component to alleviate the impact from road excitations to the vehicle body and to ensure the properties of comfortable driving, good handling, and safety of the vehicles [1,2,3,4]
Considering the above-mentioned issues for antiroll bars and the advantages provided by hydraulically interconnected suspension (HIS) system, a novel kinetic dynamic suspension (KDS) system, which is a passive hydraulic system without consuming power, is proposed in this study to solve the contradiction among different performance requirements for off-road vehicles
The results show that the roll velocity responses of the vehicle with KDS system (VKDS) decay faster than the vehicle with conventional suspension system (VCS), which is attributed to the enhanced roll mode damping properties of the KDS system, and the higher roll mode damping has the ability to ensure the balance of the body attitude in short time
Summary
Vehicle suspension system has always been considered as an essential component to alleviate the impact from road excitations to the vehicle body and to ensure the properties of comfortable driving, good handling, and safety of the vehicles [1,2,3,4]. The interconnected hydropneumatic suspensions in roll and pitch planes have been proposed by Cao [7, 20, 21] They investigated the dynamic characteristics of this system at full-car level and the results showed that the ride and handling performances could be enhanced by adjusting the pitch stiffness and damping independently, in heavy vehicle applications. Considering the above-mentioned issues for antiroll bars and the advantages provided by HIS system, a novel kinetic dynamic suspension (KDS) system, which is a passive hydraulic system without consuming power, is proposed in this study to solve the contradiction among different performance requirements for off-road vehicles.
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