基于SEA赋权图的舱室噪声传递路径分析

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

振声能量传递路径是船舶舱室噪声控制的重要依据之一。对中高频振声问题采用统计能量分析(SEA)求解,引入SEA系统传递路径的概念,并结合图论提出了舱室噪声传递的SEA赋权图法。将SEA系统等效为结点和有向边组成的有向图G_(SEA),噪声传递路径问题转变为求解G_(SEA)中的最大权重路径问题,通过偏离算法得到的K主要路径即为能量传递的主路径。以某船机舱传递到住舱中的能量传递路径为例,首先确定不同振声源在目标舱室中产生的噪声分量,选取对目标舱室影响最大子系统为路径分析对象,然后使用SEA赋权图法求解主要传递路径,从而揭示能量在结构和声腔中的传播机理,为船舶降噪优化提供指导。

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 G_（SEA）consist of nodes and directed edges,a noise transmission path problem was converted into to solve the maximum weight path in G_（SEA）. Similar to the methodology in the shortest path graph theory,the path deviation algorithm was adopted to find K path with the maximum weight,it was called K dominant transmission path in G_（SEA）. 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.