3112 排気系における振動予測技術の開発(OS.10 故障診断・予知・メンテナンス・安全性)

概要

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A simulation technique that uses a finite element method model for predicting vibrations in the exhaust system was developed. The flexible joints, that is, vibration adsorption joints are faithfully modeled on the shape of flexible tubes and the properties of other parts are assigned numerical values. Further, an accurate model is obtained on the ball joints by assigning numerical values to the dynamic properties of gaskets. The vibration force of engine is obtained using the sum of the force of inertia in component parts and reaction force produced by combustion pressure. This made it possible to predict the forces transmitted to the body from exhaust hanger so that the vibration phenomenon could be understood in terms of overall exhaust system behavior. This in turn made it possible in the pre-development stages to study the characteristic effects of altering exhaust hanger positions and using vibration absorbers in order to decrease the forces transmitted to the body.
2000-12-12