An investigation of the dynamic characteristics of hydraulic power steering systems

Wang, Miao

An investigation of the dynamic characteristics of hydraulic power steering systems

Wang, Miao

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Publication Type:: Thesis
Issue Date:: 2007

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Field	Value	Language
dc.contributor.author	Wang, Miao
dc.date.accessioned	2016-06-07T02:23:02Z
dc.date.available	2016-06-07T02:23:02Z
dc.date.issued	2007
dc.identifier.uri	http://hdl.handle.net/10453/44030
dc.description	University of Technology, Sydney. Faculty of Engineering.	en_AU
dc.description.abstract	The dynamic characteristics of the rack and pinion hydraulic power steering systems have been investigated in the time domain and the frequency domain by using modelling, simulation and testing methods. A model of the hydraulic power steering system and the numerical solution scheme were developed in order to obtain the time domain responses of the system. For the frequency domain analysis, a state space representation of the system incorporating the dynamics of the mechanical and hydraulic subsystems was proposed and the system coefficient matrices were derived. A root searching method was developed to determine the natural frequencies and corresponding modes of the steering system. Applications to a typical hydraulic power steering system were conducted to validate the developed models and computational schemes. The results obtained from the frequency domain analysis agreed well with those obtained from the transient analysis. The examples illustrated the dynamic coupling between the mechanical and hydraulic subsystems. In addition, the dynamic characteristics of the variable ratio rack and pinion steering system and the speed sensitive steering system were investigated. A hydraulic power steering system test rig, which provided an approximately realistic working environment for the hydraulic steering system, was designed and built to validate the mathematical models. A series of experiments including the impact testing on the front wheel, the steering shudder testing and the pressure ripple testing were carried out. The experimental results confirmed the presented modelling and simulation analysis. The models and test rig may assist automotive engineers in performing theoretical noise and vibration analysis of the steering system for optimising its performance. The modelling methods and numerical solution scheme which reveal the mechanical and hydraulic coupling action can be applied to the dynamics study of other complex mechanical/hydraulic systems.	en_AU
dc.format	Thesis (PhD)
dc.language.iso	en_AU	en_AU
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/44030/7/02Whole.pdf
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	au.edu.uts.lib/ppc
dc.subject	Rack and pinion hydraulic power steering systems.	en
dc.subject	Theoretical noise and vibration analysis.	en
dc.subject	Mechanical and hydraulic coupling action.	en
dc.subject	Dynamic characteristics.	en
dc.title	An investigation of the dynamic characteristics of hydraulic power steering systems	en_AU
dc.type	Thesis	en_AU
utslib.copyright.status	open_access

Abstract:

The dynamic characteristics of the rack and pinion hydraulic power steering systems have been investigated in the time domain and the frequency domain by using modelling, simulation and testing methods. A model of the hydraulic power steering system and the numerical solution scheme were developed in order to obtain the time domain responses of the system. For the frequency domain analysis, a state space representation of the system incorporating the dynamics of the mechanical and hydraulic subsystems was proposed and the system coefficient matrices were derived. A root searching method was developed to determine the natural frequencies and corresponding modes of the steering system. Applications to a typical hydraulic power steering system were conducted to validate the developed models and computational schemes. The results obtained from the frequency domain analysis agreed well with those obtained from the transient analysis. The examples illustrated the dynamic coupling between the mechanical and hydraulic subsystems. In addition, the dynamic characteristics of the variable ratio rack and pinion steering system and the speed sensitive steering system were investigated. A hydraulic power steering system test rig, which provided an approximately realistic working environment for the hydraulic steering system, was designed and built to validate the mathematical models. A series of experiments including the impact testing on the front wheel, the steering shudder testing and the pressure ripple testing were carried out. The experimental results confirmed the presented modelling and simulation analysis. The models and test rig may assist automotive engineers in performing theoretical noise and vibration analysis of the steering system for optimising its performance. The modelling methods and numerical solution scheme which reveal the mechanical and hydraulic coupling action can be applied to the dynamics study of other complex mechanical/hydraulic systems.

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