The Simulation Analysis And Experiment Research On The Vibration Performance Of The Four-cylinder Diesel Engine

The noise and vibration has become an important parameter affecting the performance of diesel engines.The optimizing improvement of diesel vibration performance has become an important research topic in the diesel engine.In this paper,the vibration performance optimization of a four-cylinder diesel engine,using the method of computer simulation and experimental have been researched.The main contents are as follows:Firstly,based on three-dimensional design and development of the research group,the finite element modeling of the diesel engine was established.By analyzing the numerical modal,experimental modal and the noise resource of the diesel,numerical modal and torsional vibration of the crankshaft,we checked the accuracy of the finite element model,and found the components to improve vibration performance;Secondly,structural optimizations were used to improve vibration performance.We researched the effects of the vibration performance improvement of the different components,and found the best components to improve vibration performance;Thirdly,the coupling optimizations were used to improve vibration performance.We researched the effect of the vibration performance improvement of different coupling optimizations,and found the best coupling optimizations to improve the vibration performance.The results showed that,after the optimization of the body,the acceleration decline of the measuring point of the body,the oil pan,the flywheel housing was 24.3%,26.8% and 18.5%,respectively;After the optimization of the oil pan,the acceleration decline of the measuring point of the body,the oil pan,the flywheel housing was 10.4%,43.5% and 8.6%,respectively;After the optimization of the oil pan,the acceleration decline of the measuring point of the body,the oil pan,the flywheel housing was 13.2%,12.8% and 53.3%,respectively;After optimization of the body,oil pan,flywheel housing,the machine vibration intensity were reduced by 18.4%,16.8% and 14.0%,respectively.The research showed that the optimization of the component effectively improved its vibration performance,and the body,supporting other components,was the best component to reduce the machine vibration.After coupled optimization of body-oil pan,the acceleration decline of the measuring point of the body,the oil pan,the flywheel housing was 26.8%,28.2 % and 30.7 %,respectively;After coupled optimization of body-flywheel housing,the acceleration decline of the measuring point of the body,the oil pan,the flywheel housing was 48.6%,27.9%and 51.4%,respectively;After coupled optimization of body-oil pan-flywheel housing,the acceleration decline of the measuring point of the body,the oil pan,the flywheel housing was 31.2%,54.2%and 56.8 %,respectively;After coupled optimization of body-oil pan,body-flywheel housing,body-oil pan-flywheel housing,the machine vibration intensity were reduced by 20.6%,22.1% and 25.0%,respectively.Comprehensive comparison,the coupled optimization of body-oil pan-flywheel housing effectively reduced the machine vibration intensity,was the best optimization program to reduce the machine vibration.