| 摘要:为实现对缸套-活塞环摩擦润滑状态的监测，基于声发射技术对某小型四缸柴油机缸套-活塞环的润滑状态进行研究。采用小波阈值降噪法抑制阀门启闭和燃烧所引起的声发射信号，分别提取每个冲程声发射信号均方根（root mean square，RMS），选择RMS值作为评价缸内润滑状态的指标。研究结果表明：进排气冲程RMS值可以很好地表征缸内的润滑状态；受试验条件的限制，贫油状态的RMS值整体上略低于正常状态的RMS值，但差异性并不明显。 |
| 关键词: 柴油机 声发射 缸套-活塞环 润滑状态 小波降噪 |
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| Lubrication State Monitoring of Cylinder Liner-Piston Ring Based on Acoustic Emission Technology |
| HAN Hao,DING Hongyuan,SHI Zhaoyu,WANG Zhongwei,WANG Boqun |
| College of Power and Energy Engineering, Harbin Engineering University,Harbin 150001,China;Wuhan Second Ship Design and Research Institute, Wuhan 430205,China |
| Abstract:In order to realize the monitoring of the cylinder liner-piston ring friction lubrication status，the lubrication status of the cylinder liner-piston ring of a small four-cylinder diesel engine was studied based on the acoustic emission technology.The wavelet threshold noise reduction method was used to suppress the acoustic emission signals caused by valve opening and closing and combustion.The root mean square（RMS）of acoustic emission signals of each stroke was extracted，and the RMS value were selected as the index to evaluate the lubrication state in the cylinder. The research results show that the RMS value of the intake and exhaust strokes can well characterize the lubrication state in the cylinder，and due to the limitations of experimental conditions，the RMS value of the lean oil state is generally slightly lower than the RMS value of the normal state，but the difference is not significant. |
| Key words: diesel engine acoustic emission cylinder liner-piston ring lubrication state wavelet noise reduction |
