Fault Diagnosis of Gas Engine Bellows

Yu-shan JIN, Qing-ren ZHAO, Shou-le WANG, Xu-wei HU, Dan SUN


A bellow of an waste gas exhaust system has cracks after working 80 hours. Modal test and force source analysis were carried out for the system. It was found that cracks of the bellow was caused by resonance. The system dynamics model is established by using finite element software. The exciting force is introduced into the model. The load on bellows exceeds the maximum permissible stress. The bellow will have cracks in this state. The resonance region is avoided by modifying the structure. After structural adjustment, the bellow did not break again.


Fault diagnosis, Vibration test, Bellows expansion joint, Fatigue fracture


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