摩擦磨損過程摩擦振動(dòng)特征提取方法的研究
[Abstract]:Wear is one of the main factors leading to the failure of mechanical parts. In the process of mechanical equipment running, excessive wear and tear will lead to mechanical parts scrapping or even mechanical equipment damage, resulting in certain economic losses. Therefore, it is very important to monitor the wear and tear during the operation of mechanical equipment. Friction vibration and friction force are inevitable phenomena in the process of friction and wear. The signals of friction vibration and friction force contain abundant information reflecting the wear state of friction pairs. The treatment and analysis can realize the monitoring of the wear state of the friction pair and do not affect the normal working state of the equipment. Many scholars at home and abroad have discussed and studied friction vibration and friction force, and put forward different treatment methods, however, The bottleneck problem is how to accurately extract the characteristic information from the friction vibration signal which can reflect the wear state of the friction pair. Therefore, the study of friction vibration feature extraction has certain theoretical significance and important engineering application value. In this paper, the friction and wear tests of cylinder liner and piston ring of marine diesel engine are carried out by using MMW-1 vertical universal friction and wear tester under laboratory conditions. The friction vibration and friction force signals produced by friction and wear under different working conditions are studied in detail. The wavelet packet transform feature extraction method of friction vibration and friction signal is discussed, and the mapping relationship between the extracted feature parameters and the wear state of cylinder liner and piston ring is analyzed. The results show that the frequency domain characteristic parameter M and the time domain characteristic parameter P of friction vibration and the time domain characteristic parameter E of friction force extracted by wavelet packet transform reflect the intensity and complexity of the wear of cylinder liner and piston ring. The wear state of cylinder liner-piston ring can be quantitatively characterized.
【學(xué)位授予單位】:大連海事大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類號(hào)】:TH117.1
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