260 非線形ばねで支持された粘弾性ブロックの振動減衰特性の有限要素解析(振動解析,OS-2 運動と振動のモデリングと制御(3))

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This paper describes vibration analysis using finite element method for a viscoelastic block supported by a nonlinear concentrated spring. The restoring force of the spring has cubic nonlineariry and linear hysterisis damping. Finite element for the nonlinear spring is expressed and is connected to the viscoelastic block modeled by linear solid finite elements in consideration with complex modulus of elasticity. 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 share of dissipated energy on nonlinear frequency responses for the viscoelastic block are clarified.
2004-09-27