Modeling and modal analysis of multi-body truck system fitted with hydraulically interconnected suspension

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Journal Article
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering, 2012, 48 (6), pp. 116 - 123
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A novel hydraulically interconnected suspension system is proposed for compromising the control between the pitch and bounce mode of sprung mass. Based on the transfer matrix method, the impedance matrix of hydraulic subsystem is derived, and the mechanical and hydraulic coupled multi-body dynamic equations are then obtained. An eigenvalue iteration identification method for frequency dependent system characteristic equation is developed based on numerical optimization, and the validity of this method is then verified. By applying the theory of complex mode, the comparison analysis of vibration of sprung mass is carried out between the tri-axle truck with a convention suspension and that fitted with the hydraulically interconnected suspension system. The obtained results indicate that the anti-oppositional hydraulically interconnected suspension system is able to effectively reduce the pitch motion of sprung mass in pitch plane, and simultaneously maintain the ride comfort performance. 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. © 2012 Journal of Mechanical Engineering.
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