Impedance optimization design of base structures with high transmission loss

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (6) : 7-14.

YANG Kang 1 YANG Deqing 1,2 WU Binghong 2

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Abstract

The design method for base structures with high transmission loss based on the impedance optimization was studied, and the quantitative relationship about high transmission loss was defined. By introducing the concept of impedance magnitude, a method describing the damping effect of base structures was proposed based on the impedance magnitude level, and the design method for base structures with high transmission loss was put forward through the impedance integrated optimization. Taking a surface vessel as a computational example, the vibration response characters of the base structure of its hold frame were analysed by using the FEM software, in which the technique of single point excitation and multi points responses was adopted to compute the impedances. By the example, it was validated that describing the damping effect of base structures of ships by using the concept of impedance magnitude level is feasible. By virtue of the approximation agent model optimization method in the Isight, platform, the topological lay-out of square stell elements in different locations on the pedestal frame system was investigated, where the square steel parameters were taken as design variables to realize the multi-factor composite resistance vibration optimization design. A set of impedance optimization design methods for high transmission loss base structures were proposed, which provides pratical engineering ways to improve the vibration reduction performance of base structures.

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base structures / impedance / impedance magnitude / high transmission / resistance vibration optimization / vibration reduction

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YANG Kang 1 YANG Deqing 1,2 WU Binghong 2. Impedance optimization design of base structures with high transmission loss[J]. Journal of Vibration and Shock, 2019, 38(6): 7-14

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