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Abstract and Applied Analysis
Volume 2013, Article ID 501081, 12 pages
Research Article

A Study on Vibration Characteristics and Stability of the Ambulance Nonlinear Damping System

Institute of Medical Equipment, Academy of Military Medical Sciences, 106 Wandong Road, Hedong District, Tianjin 300161, China

Received 28 December 2012; Revised 25 March 2013; Accepted 22 April 2013

Academic Editor: Chunrui Zhang

Copyright © 2013 Meng Yang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Considering the impact of the nonlinear stiffness, a 2-DOF vibration model with cubic terms was established according to the structural feature and nonlinear behavior. Ignoring the impact of nonlinear terms, the system was linearly analyzed. In the case of primary resonance and 1 : 1 internal resonance, a multiscale method was used to obtain a first-order approximate solution. Taking the parameters of one tracked ambulance for instance, the approximate solution was corroborated and the influence of the parameters on damping effect was investigated. Finally, motion stability of the damping system was analyzed with singularity theory. The theoretical bases for improving efficiency of the damping system were provided.