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Author(s): |
Wenping Yang, Tianjin University of Technology and Education, Tianjin, China, 300222
Yuxiu Xu, School of Mechanical and Electronic Engineering, Tianjin Polytechnic University, Tianjin, China, 300160/Tianjin Key Laboratory of Advanced Mechanics Equipment technology, Tianjin, China, 300160 |
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Abstract: |
Structure vibration and machine noise from piston click have the great scale in collectivity vibration and noise of diesel engine. It is difficult to distinguish from only on-the-spot survey vibration signal. So mechanism analysis and test is combined to pick up and identify the vibration character of piston click fault. In the paper imitation method analyzes structure vibration of vehicle diesel engine, and establish finite element model of diesel engine block for structure dynamic response analysis. Modal analysis and fundamental wave relativity analysis of on-the-spot survey vibration signal make sure the damp of finite element model. For the surface vibration response of imitation and on-the-spot survey model, the rule of impact section along with rotate speed in time region, frequency region and time-frequency plain is compared to affirm the comparability of response character. The relative rule of engine block structure vibration from piston click is summed up, which is practical for machine design, state monitor and control and fault diagnosis.
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