Nonlinear transient response analysis for double walls with a porous material supported by nonlinear springs using FEM and MSKE method
We analyze impact responses of a soundproof structure with frames supported by nonlinear springs. The structure contains a porous material sandwiched between a damped panel and a cover plate. We propose a new numerical method of nonlinear transient responses using FEM and MSKE method. To reduce DOF, we introduce normal coordinates corresponding to linear vibration modes. We find nonlinear couplings between modes in the double walls and in the nonlinear springs.
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