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While the previous steering models had different emphases and advantages, an integrated model of hydraulic power steering system, which includes the detailed dynamic characteristics of the hydraulic line, the valve and the mechanism, still need to be developed for the accurate vibration analysis of the system. Also, it is found that none of the foregoing models includes the variable ratio rack and pinion gear set. Though the effects of the VR steering system on vehicle dynamics have been convincingly dis
cussed by Heathershaw , the steady state and transient dynamic characteristics of the hydraulic power variable ratio steering system itself has not been seriously investigated and reported.