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`Mathematical Problems in EngineeringVolume 2014, Article ID 370634, 9 pageshttp://dx.doi.org/10.1155/2014/370634`
Research Article

## Chaotic Vibration and Comfort Analysis of Nonlinear Full-Vehicle Model Excited by Consecutive Speed Control Humps

1College of Information Engineering, Chongqing Institute of Engineering, Chongqing 402260, China
2College of Automation, Chongqing University, Chongqing 400044, China
3Department of Mechanical Engineering, Oyama National College of Technology, Oyama 323-0806, Japan
4College of Science, Guizhou Institute of Technology, Guiyang 550003, China

Received 13 July 2014; Revised 29 September 2014; Accepted 29 September 2014; Published 1 December 2014

Academic Editor: Yan-Jun Liu

Copyright © 2014 Zhiyong 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.

#### Abstract

When vehicles are driven on consecutive speed control humps, the parameters of speed control humps such as height, width, and space and vehicle’s speed are the important factors to affect safety and comfort of passengers. The paper assumes that the excitation function of the consecutive speed control humps is a half-sine wave and a SCHs-speed coupling excitation model called 7-DOF nonlinear full-vehicle model and differential equation are established by introducing the time delay of incentive input and then by using numerical simulation to analyze chaotic vibration in 7-DOF nonlinear full-vehicle model excited by consecutive speed control humps. The numerical simulation results show that chaotic vibration phenomenon possibly appears as vehicles are driven on consecutive speed control humps. Further studies indicate that the influence of nonlinear running state of vehicle on driving comfort becomes manifest as the state changes from chaotic motions to the periodic motion of the high speed and the periodic motion of the low speed, and this phenomenon can be avoided by changing the parameters of consecutive speed control humps. The results can be applied in design of vehicle and road humps pavement.