| 史强，谷丰收，王铁，魏娜莎，李国兴，杨龙杰.基于声发射和小波分析的活塞环缸套系统的摩擦润滑状态研究[J].内燃机工程,2017,38(4):79-102. |
| Study on Friction and Lubrication Condition between Piston Rings and Cylinder Liner Based on Acoustic Emission and Wavelet Analysis |
| DOI： |
| Key Words:IC engine diesel engine acoustic emission piston-cylinder system wavelet multi-resolution analysis envelope analysis |
| Author Name | Affiliation | | SHI Qiang,GU Fengshou,WANG Tie,WEI Nasha,LI Guoxing,YANG Longjie | 1.Department of Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2.Centre for Efficiency and Performance Engineering, University of Huddersfield, Huddersfield HD1 3DH, UK
3.Department of Economics and Management, Taiyuan University of Science and Technology,
Taiyuan 030024,China
4.SAIC-GM-Wuling Automobile Co., Ltd., Liuzhou 545007,China；
5.Suzhou Auto Technology Co., Ltd., Suzhou 215021,China |
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| Abstract:The acoustic emission technology was used to on-line monitor friction and lubrication state. The wavelet multi-resolution analysis was adopted to inhibit high amplitude signals of oscillatory acoustic emission caused by valve switch and combustion, and the threshold de-noising method was used to extract the acoustic emission signals caused by viscous friction. Then the wavelet envelope analysis was applied to calculate the average amplitude of the acoustic emission signals in the middle of a stroke as criteria for evaluating the lubrication state of a system of piston rings and cylinder liner. The results show that the acoustic emission signals in the middle of a stroke can effectively characterize the friction and lubrication condition between a system of piston rings and cylinder liner, and can distinguish the effect of different types of oil product on the lubrication state of a system of piston rings and cylinder liner through the standard acoustic emission signals. It is also shown that the amplitudes of acoustic emission signals increase slightly with load and significantly with engine speed. The acoustic emission monitoring technique is fully demonstrated to be effective for online monitoring of the friction and lubrication state of a system of piston rings and cylinder liner. |
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