船舶舱室噪声传递路径分析的声振熵赋权图法

Vibroacoustical Entropy Weighted Graph Method for Sound Transmission Path Analysis of Ship Cabin Noise

针对传统的矢量迭加法难以满足噪声分布具有中高频域特点的船舶声学分析要求,将船舶噪声分析统计能量系统比拟为热力学系统,引入声振温度和声振熵的概念,并结合图论提出识别船舶舱室噪声传递路径的声振熵赋权图法.将噪声传递路径分析问题转化为求解声振熵赋权图最短路径问题,混合熵增率累计最大的路径即为能量传递的主路径.通过对比算例和超大型油轮上层建筑舱室空气噪声能量传递路径分析算例,验证了船舶舱室噪声传递路径的声振熵赋权图法的有效性,初步揭示了超大型船舶舱室噪声分布与传播机理,为超大型油轮减振与声学设计决策及后续优化提供指导.

The conventional vector superposition method is difficult to meet the requirements on the analy- sis of ship cabin noise transmission paths located in the mid and high frequency domain. By comparing the statistical energy analysis system to a thermodynamic system and by introducing the concepts of vibro- acoustical temperature and entropy, the problem of ranking dominant paths can be posed as a variation of the so-called K shortest path problem in graph theory. The paths with maximum sum of mixing entropy rate become the dominant energy paths. Both comparative examples and practical application to a VLCC ship were included to demonstrate the effectiveness and the commonality of this method. The results pre liminary revealed the mechanism of sound transmission through ship cabins and could provide guidance for the vibroacoustics design of very large ships.