等価縮小モデルを用いた連成振動の解析法

概要

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Coupled vibration problems in large scale mechanical or rotor systems are often encountered; for instance, a shaft-blade coupled vibration of a turbine and generator set. Instead of FEM modelling for a global system consisting of main system A and sub system B, an equivalent reduced system is presented. According to the reduction technique, the eigenvalue problem of the vibrating system B is first solved; then, equivalent masses and springs are determined for each corresponding eigenmode of system B. Therefore, the original global system is reduced to system A plus the additional masses representing system B. It is concluded that the reduced model is physically reasonable and numerically accurate enough, even though a simpler program is used for the system A than for the global system A+ B.
社団法人日本機械学会の論文
1988-03-25