Passive and active hydraulically interconnected suspensions and their applications

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Conference Proceeding
Advances in Applied Mechanics Research, Conference Proceedings - 7th Australasian Congress on Applied Mechanics, ACAM 2012, 2012, pp. 18 - 38
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In this paper, after giving a brief literature survey introduction, a description is presented of the mechanism and modelling of system dynamics in the frequency domain of a vehicle fitted with a hydraulically interconnected suspension (HIS) using a 4-DOF half-car model. A set of coupled, frequency-dependent equations, which govern the dynamics of the integrated half-car system, are derived and the applications of these equations to both free and forced vibration analysis are presented. The experimental validation of the analytical results of the free and forced vibrations of the roll-plane half-car is provided. Simulation results obtained for the roll-plane half-car fitted with a hydraulically interconnected suspension are compared with those of a conventional suspension. A brief introduction is given on a 9-DOF model of a vehicle fitted with an HIS and simulations of a fishhook manoeuvre to assess its handling performance. The fluid subsystem of the HIS is modelled using a nonlinear finite-element approach, resulting in a set of coupled, first-order nonlinear differential equations, which describe the dynamics of the integrated mechanical and hydraulic vehicle system. Both the simulation and test results indicate that, in general, the HIS-equipped vehicle possesses superior handling performance, as measured by the sprung mass roll angle, roll rate, roll acceleration, lateral acceleration and the vehicles Rollover Critical Factor. A brief introduction is also presented on the recent development of the motion-mode energy method for classifying vehicle body-wheel motions into several motion-modes, according to their modal properties, and quantifying the contribution of each motion-mode by its energy intensity in real time. The motion-mode energy and mode contribution ratio are used to determine the control priority on the control of the most dominating motion-mode. Simulation results are obtained to illustrate the applicability of the proposed methods. Finally, the paper very briefly introduces the semi-active and active HIS, including the mechanism of active HIS hardware. The preliminary experimental results on the active HIS are also given to show the applicability of the novel active HIS mechanism and controllers. Furthermore, discussions are provided on the current issues encountered in applications of passive and active HIS and the future research challenges. Concluding remarks are given on the key findings obtained from the conducted studies on the passive and active HIS.
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