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Vibration and noise source identification methods for a diesel engine
Jiaxin Xi,Zengming Feng,Guoqiang Wang,Fei Wang 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.1
In this study, we used a four-cylinder inline diesel engine as an example to explain how to use test methods and multi-body dynamictechniques to identify the exact source of noise and vibration. A 1 meter noise test was conducted to indicate that the engine front end isthe main source of noise. The near-field sound intensity method and the near-field acoustic holography technique were used to identifythe chain drive system as the source of noise and vibration. A 3D dynamic analysis model of the timing chain drive system was establishedusing RecurDyn software. Results of the analysis show that the hydraulic tensioner is incompatible with the timing drive system ofthe bush roller chain. Hence, the timing chain system causes a loud noise and strong vibration. Some strategies on how to optimize thetiming chain drive system are presented at the end of this paper.