Transfer path analysis of ship structure-borne noises based on the Warshall-Floyd algorithm

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (2) : 82-89.

XIANG Yujia，JI Zhenlin，ZHAO Xintang

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Abstract

The structural vibration is the main noise source for ships,while the traditional test method is difficult to identify the transmission path of structure noises.Based on the concept of vibration subsystems in the statistical energy analysis (SEA) theory,the transfer paths of structure noises were analyzed by using the weight graph method.Abstructing the similar modes groups into points in the graph,and introducing the adjacent relationships among vertex set up by the SEA matrix in the energy balance equation,the physical model was translated into the weighted matrix of a shortest path problem by virtue of the path efficiency method and statistical entropy method.With the Warshall-Floyd algorithm,the first N shortest paths between any two points in the graph were figured out,and the first N dominant transfer paths from the noise source at any position to the targeted cabin were also offered.With the comparison of transfer paths in different frequency bands and different vibration modes groups and with the analysis of the weights of each dominant transfer path,some general rules for the ship’s structure-borne noise transmission were revealed,which provide constructive guidance for the reduction of structure-borne noises.

Key words

transfer path analysis of structure-borne noise / path efficiency method / statistical entropy method / Warshall-Floyd algorithm / shortest paths

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XIANG Yujia，JI Zhenlin，ZHAO Xintang. Transfer path analysis of ship structure-borne noises based on the Warshall-Floyd algorithm[J]. Journal of Vibration and Shock, 2019, 38(2): 82-89

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