Modelling and characteristic analysis of tri-axle trucks with hydraulically interconnected suspensions

Abstract

In this paper, a new hydraulically interconnected suspension (HIS) system is proposed for the implementation of a resistance control for the pitch and bounce modes of tri-axle heavy trucks. A lumped-mass half-truck model is established using the free-body diagram method. The equations of motion of a mechanical and hydraulic coupled system are developed by incorporating the hydraulic strut forces into the mechanical subsystem as externally applied forces. The transfer matrix method (TMM) is used to evaluate the impedance matrix of the hydraulic subsystem consisting of models of fluid pipes, damper valves, accumulators, and three-way junctions. The TMM is further applied to find the quantitative relationships between the hydraulic strut forces and boundary flow of the mechanicalfluid interactive subsystem. The modal analysis method is employed to perform the vibration analysis between the trucks with the conventional suspension and the proposed HIS. Comparison analysis focuses on free vibration with identified eigenvalues and eigenvectors, isolation vibration capacity, and force vibration in terms of the power spectrum density responses. The obtained results show the effectiveness of the proposed HIS system in reducing the pitch motion of sprung mass and simultaneously maintaining the ride comfort. The pitch stiffness is increased while the bounce stiffness is slightly softened. The peak values of sprung mass and wheel hop motions are greatly reduced, and the vibration decay rate of sprung mass is also significantly increased.

Research on Damping Noncoincidence and Its Influence Factors of Multibranch Hydropneumatic Suspension

“…Zhang et al did some research on modeling and bench test as to IHS. The presented approach provides a scientific basis for investigating the dynamic characteristics of vehicles equipped with IHS, and the results offer further confirmation that interconnected suspension schemes can provide, at least 2 Advances in Mechanical Engineering to some extent, individual control of model stiffness and damping characteristics [19][20][21][22][23].…”

Modal and Dynamic Analysis of a Vehicle with Kinetic Dynamic Suspension System

“…Hrovat suggests that this full vehicle model generally predicts the acceleration response up to around 10 or 12 Hz on the rough road, with declining accuracy above that [33]. The hydraulic impedance method may be applicable for any conceivable analytical vehicle model in small amplitude applications, in which nonlinearities in the fluid system may be negligible [25]. Considering the above-mentioned reasons, the linear vehicle model is also introduced to analyze the modal characteristics of the VCS and VKDS.…”

“…The hydraulic impedance method is proposed for the frequency domain modelling due to its computational advantages in this paper. Moreover, this method has been used to study the modal characteristics for triaxle trucks with HIS by Ding et al, [25]. The equation of the fluid system is given as follows:…”

“…A systematic method was presented to investigate the mechanics of roll-plane HIS in time and frequency domain and the results were verified by the experiments. Ding et al have presented a new HIS system to study the dynamics of triaxle heavy trucks [25]. The theoretical results showed that the proposed HIS system was able to reduce the pitch motion of sprung mass and maintain the ride comfort simultaneously.…”

Dynamic Characteristics Analysis of Vehicle Incorporating Hydraulically Interconnected Suspension System with Dual Accumulators

“…Smith et al studied the characteristics of handling performances with fishhook steering input and half-sine bump input [19]. Ding et al extended the application of HIS subsystem on vehicle with two axles to that with three axles, using the transfer matrix method to generate the final dynamic equations of HIS subsystem [31]. Wang and coworkers developed a motion-mode energy method to identify the contribution of HIS subsystem on vehicle motion modes, which could be used to decouple vehicle dynamic energy distribution on each motion mode [32].…”