Dynamic Analysis of the 4-DOF Vehicle-Road Coupling System Under Random Excitation

LI Qian; LIU Jun-qing; CHEN Cheng-cheng

doi:10.3879/j.issn.1000-0887.2015.05.002

Volume 36 Issue 5

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LI Qian, LIU Jun-qing, CHEN Cheng-cheng. Dynamic Analysis of the 4-DOF Vehicle-Road Coupling System Under Random Excitation[J]. Applied Mathematics and Mechanics, 2015, 36(5): 460-473. doi: 10.3879/j.issn.1000-0887.2015.05.002

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Dynamic Analysis of the 4-DOF Vehicle-Road Coupling System Under Random Excitation

doi: 10.3879/j.issn.1000-0887.2015.05.002

¹School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, P.R.China;²School of Science, Xi’an University of Architecture and Technology,Xi’an 710055, P.R.China

Funds: The National Natural Science Foundation of China(51178387)

Received Date: 2014-08-29
Rev Recd Date: 2015-04-09
Publish Date: 2015-05-15

Abstract

Abstract

The Gauss stationary random process was adopted to simulate pavement roughness, and a MATLAB program was compiled to obtain the values of pavement roughness. A 4-DOF vehicle model was built, and the vehicle and road were seen as a holistic coupling system. Then the dynamic equilibrium equations for the vehicle-road coupling system were established. In order to simplify the analysis work, the traditional method which used the theory of random vibration to determine the dynamic tire force was avoided and the values of pavement roughness were directly input in the form of vectors into the dynamic equilibrium equations, which were solved with the MATLAB program developed based on the incremental Newmark-βmethod. The reliability of the model was verified with a test. Then how the dynamic load coefficient and vertical vehicle acceleration were influenced by the vehicle speed and pavement roughness grade was parametrically analyzed in an example. At last, the effects of the roadbed elastic modulus on the vehicle vibration characteristics were investigated. The results show that, the vehicle dynamic load coefficient increases with the driving speed and the pavement roughness grade as well, meanwhile the vehicle body vibration acceleration rises with the driving speed but converges or even slightly falls after a peak value, and that acceleration goes up always with the roughness grade; furthermore, the dynamic load coefficient decreases with the roadbed elastic modulus and converges down to a constant value.
- vehicle-road coupling system,
- random excitation,
- dynamic analysis,
- 4-DOF,
- dynamic load coefficient

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References(17)

References

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