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
1.Department of Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2.Center for Efficiency and Performance Engineering, University of Huddersfield, Huddersfield HD1 3DH, UK
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.
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. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(19): 205-210.
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