312 非線形集中ばねで支持された吸音二重壁構造の高速非線形減衰応答解析

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This paper describes vibration analysis using finite element method for automotive sound proof structures with automotive body frames supported by nonlinear concentrated springs. The restoring force of the spring has cubic nonlinearity and linear hysteresis damping. To calculate damping properties for automotive sound proof structures including elastic body, viscoelastic body and porous body, displacement vectors as common unknown variable are solved under coupled condition. Further, the discretized equations in physical coordinate are transformed into the nonlinear ordinary coupled equations using normal coordinate corresponding to linear natural modes. This transformation yields computation efficiency. Influences of the nonlinear springs and sound proof structures are clarified on the nonlinear frequency responses.
一般社団法人日本機械学会の論文
2011-09-05