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The internal combustion engine design is moving in the direction of the high-speed , lightweight , high-power , continuous development . With the constant pursuit of high-performance , lightweight , low-cost and high market adaptability engine , the reliability of engine design and noise and vibration reduction has become increasingly important. This paper focuses on the powertrain vibration isolation the core issue of the application of modal analysis theory and finite element techniques, the assembly dynamic characteristics of a certain type of diesel engine body and its power to conduct the study , and provide the basis for improvements powertrain vibration isolation . Firstly, the diesel engine block vibration test its vibration level evaluation , testing and evaluation of diesel engines in passenger cars and its powertrain vibration condition , vibration diagnosis of diesel engine loading large reason ; Second the geometric model of the diesel engine block and transmission experiments using experimental modal analysis method to study the dynamic characteristics of a three-dimensional solid modeling ; diesel engine block , crankcase , transmission and powertrain with Pro / E software , while establishing diesel engine block its powertrain dynamic characteristics analysis of the finite element model , calculate a body modal frequencies and mode shapes and modal experiment results , indicating the body finite element model created with sufficient the accuracy ; powertrain also calculated the modal frequencies and mode shapes , and provide a basis for powertrain support position adjustment ; Finally, the proposed measures for improvement , the upcoming powertrain support position by a gearbox change in engine flywheel housing , and improved experimental verification , the results showed that the change powertrain support position can achieve good isolation .
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