SEA weighted digraph method for vibro-acoustic energy transmission path analysis in cabins

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (23) : 164-169.

ZHANG Wenchun 1, DUAN Shulin 1, XING Hui1, YAN Jin 2 SONG Yuchao1

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Abstract

Vibro-acoustic energy transmission path is one of important bases for noise control in ship cabins. Based on the definition of the statistical energy analysis (SEA) model often used for mid and high frequency domain, the SEA weighted digraph was introduced to solve ship cabin noise transmission problems. A SEA system was equivalent to a digraph GSEA consist of nodes and directed edges, a noise transmission path problem was converted into to solve the maximum weight path in GSEA . Similar to the methodology in the shortest path graph theory, the path deviation algorithm was adopted to find path with the maximum weight, it was called dominant transmission path in GSEA. An example in a ship was used to demonstrate the application of the proposed method. Noise contribution of different sources to an accommodation cabin was determined firstly, and the subsystems with higher energy level were chosen as the objects to be analyzed. The dominant transition path was solved with the SEA weighted digraph. The results revealed the mechanism of energy transmission through structures and cabins, and provided a guide for ship denoising optimization.

Key words

statistical energy analysis (SEA) / dominant path / transmission path analysis / graph theory / cabin noise.

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ZHANG Wenchun 1, DUAN Shulin 1, XING Hui1, YAN Jin 2 SONG Yuchao1. SEA weighted digraph method for vibro-acoustic energy transmission path analysis in cabins[J]. Journal of Vibration and Shock, 2017, 36(23): 164-169

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