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J4  2012, Vol. 46 Issue (3): 489-493    DOI: 10.3785/j.issn.1008-973X.2012.03.016
Fatigue crack diagnosis of engine-block by time series analysis
LIU Zhen-tao1, ZHANG Peng-wei1,2, YU Xiao-li1, LI Jian-feng2, CHEN Zhan-shan2
1. Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China;
2. Weichai Power Co. Ltd., Weifang 261001,China
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The crack of engine-block made of cast iron often occurs suddenly in engine-block fatigue test, and the crack is not easy to be diagnosed. In order to overcome the above difficulties,the strain which is the response of output in the engine-block fatigue test was used to diagnose the occurrence of fatigue crack. The strain gauge was sticked on the bottom of crankcase to acquire the real-time strain signals,and the signals were modeled by time series analysis. Euclid distance, Mahalanobis distance and the variance of residual were calculated respectively to find the symptom of fatigue crack in the engineblock fatigue test. The result shows that the amplitude of strain has subtle difference between undamaged block and damaged block in time field, but the variance of residual has the instantaneous mutation at the same time, so it can be used to diagnose the fatigue crack occurrence.

Published: 01 March 2012
CLC:  TK 427  
Cite this article:

LIU Zhen-tao, ZHANG Peng-wei, YU Xiao-li, LI Jian-feng, CHEN Zhan-shan. Fatigue crack diagnosis of engine-block by time series analysis. J4, 2012, 46(3): 489-493.

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