クランク軸振動に関する研究 : (伝達マトリックス法における剛性解析)

概要

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Recently, the crankshaft vibration of reciprocating internal combustion engines is becoming a problem not only on torsional vibration but on bending vibration as speeding up, powering up and lightening of the engines. On crankshaft vibration of reciprocating internal combustion engines, there are many studies on torsional vibration but less on bending or multi-mode vibration. It is difficult to apply the conventional methods for such a complex vibration. The complex vibration has been analyzed precisely by Prof. Iwamoto and Prof. Wakabayashi using the Transfer Matrix Method. But as the accuracy of result obtained from this method has been largely depend on how accurately the stiffness of the crankshaft is estimated on its coarse modelling, it is necessary to correct the crankshaft model, and it has been corrected by measured value. In this paper, the Finite Element Method is used to correct the crankshaft model. The values of the stiffness calculated by the Finite Element Method and measured by unit tests have good coincidence. As a result, the crankshaft model of the Transfer Matrix Method is corrected accurately and as shown in this paper, the accuracy of crankshaft natural frequency calculated is more than 90 percent to the measured one.
社団法人日本マリンエンジニアリング学会の論文