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Technical Paper

Valve Motion Simulation Method for High-Speed Internal Combustion Engines

Abnormal valve gear vibration is a perennial problem confronting the designer of high-performance 4-stroke engines. It would shorten time and reduce costs if an analytical method could be applied to the prediction of engine valve behavior. This paper describes a method of valve motion simulation for both SOHC and DOHC valve gears through interactive calculation and using computer graphics. The authors tried to set up as simple a simulation model as possible by using modal analysis and modeling techniques. Through setting simulation model parameters and experimental damping factors, a close correlation between calculated and actually measured results was found.