Micro-process model of hydraulic shock absorber with abnormal structural noise
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In order to discover the causes of the abnormal noise of shock absorbers, it is necessary to identify the operating characteristics of the shock absorbers. A micro-process model for operation of the hydraulic shock absorber was presented. A novel concept, which describes the process of hydraulic shock absorber by dividing it into smaller steps, was proposed. The dynamic model and the differential equations were established. The results of numerical simulation agree well with data obtained from the vibrostand test, indicating that the collision between the piston and the oil, the alternation of static friction and sliding friction acted between the piston and the cylinder, and the adherence between valve plate and piston result in impact on the piston head near the top dead center and the bottom dead center. Ultimately, the impact excites the high-frequency vibration of the piston structure, which can generate the abnormal noise in the hydraulic shock absorber after its transfer. And the maximum vibration acceleration on the piston head and the abnormal noise increase with the increase of the gap between the oil and piston rod head, the maximum static friction force and the adhering function, respectively.
Key wordsshock absorber abnormal noise micro-process clearance impact simulation
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- YU Da-wei, LUO Jin-liang. An analysis on the cause of abnormal sound of automobile shock absorber [J]. Journal of Weapon, 2000, 21(1): 19–26. (in Chinese)Google Scholar
- RUNLING P, JIN J, RALPH O B. Design of an optimal shock-damping isolator with application to casters [J]. Journal of Sound and Vibration, 2006, 289(2): 278–293.Google Scholar
- LU Zhen-hua, LI Shi-min. Simulation techniques for nonlinear dynamic characteristics of telescopic hydraulic dampers [J]. Journal of Tsinghua University: Science and Technology, 2002, 42(11):30–37. (in Chinese)Google Scholar
- LI Zheng. Reason analysis and simulation investigation of front shock absorber abnormal sound for Chang’an SC6350 [D]. Chongqing: Chongqing University, 2004. (in Chinese)Google Scholar
- MOLLICA R, YOUCEF T K. A non-linear dynamic model of a monotube shock absorber [C]// Proceedings of the American Control Conference. Albuquerque, New Mexcico: IEEE Press, 1997: 704–708.Google Scholar
- HIROFUMI M, MASATO K, HIDEAKI K. Mechanism analysis of shock ratting noise [J]. TOYOTA Technical Review, 1997, 47(1):96–103. (in Japanese)Google Scholar