基于声发射的柴油机连杆大端轴瓦碰撞摩擦故障诊断

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (19) : 205-210.

论文

党轩1，谷丰收1,2，王铁1，李国兴1，王欢欢1，张虎1

作者信息 +

Collision friction fault diagnosis for diesel engine connecting rod big end bearing bush based on acoustic emission

DANG Xuan1 GU Fengshou1, 2 WANG Tie1 LI Guoxing1 WANG Huanhuan1 ZHANG Hu1

Author information +

文章历史 +

摘要

为了对某型单缸柴油机进行故障诊断，将声发射传感器布置在柴油机表面不同的位置，通过对比不同测点的异常声发射信号峰值响应，定位到异常声发射信号来源于发动机连杆大端轴瓦处。在对连杆大端轴瓦处异常声发射信号进行诊断后，结合MATLAB仿真计算连杆大端轴承力确定了轴瓦的故障类型，最后通过拆机检查和更换轴瓦来验证声发射的诊断结果。结果表明：由于连杆轴径和轴瓦之间的配合间隙过大，使得单缸柴油机在工作过程中连杆轴径和轴瓦每隔90°就会发生一次碰撞摩擦，导致声发射信号在相应的曲轴转角位置出现异常峰值响应。声发射技术为发动机的故障源定位和发动机连杆大端轴瓦处的碰撞摩擦故障诊断提供了更准确的方法。

Abstract

In order to diagnose fault of a single-cylinder diesel engine, acoustic emission (AE) sensors were installed at different positions on the diesel engine’s surface.By comparing peak responses of abnormal AE signals at different measured points, the strongest abnormal AE signal was found to locate at the big end bearing bush of the engine connecting rod.After diagnosing the abnormal AE signal at the big end bearing bush of the connecting rod, the fault type of the bearing bush was determined with MATLAB simulation.Finally, through the disassemble inspection and replacement of the bearing bush, the sound emission diagnosis results were verified.The results showed that the fit clearance between the connecting rod shaft neck and the bearing bush is excessive large, so the connecting rod shaft neck and bearing bush have a collision and friction when the diesel engine rotates each 90°, the AE signal at the corresponding crankshaft angle position is caused to have an abnormal peak response.AE technique provided a more accurate method for fault source positioning of diesel engines and collision friction fault diagnosis of diesel engine connecting rod big end bearing bush.

导出引用

党轩1，谷丰收1,2，王铁1，李国兴1，王欢欢1，张虎1. 基于声发射的柴油机连杆大端轴瓦碰撞摩擦故障诊断[J]. 振动与冲击, 2018, 37(19): 205-210

DANG Xuan1 GU Fengshou1, 2 WANG Tie1 LI Guoxing1 WANG Huanhuan1 ZHANG Hu1. Collision friction fault diagnosis for diesel engine connecting rod big end bearing bush based on acoustic emission[J]. Journal of Vibration and Shock, 2018, 37(19): 205-210

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