尾流中多气泡模型及有限元分析

舰船尾流的声学特性主要由分布其中的气泡声学特性决定。分析尾流中气泡的分布,根据气泡的数密度及半径分布,建立了尾流中双气泡的结构模型,并在此基础上,利用有限元方法和分析软件建立了尾流中多气泡的有限元模型,分析模型在周期变化载荷作用下的压力分布和结点位移变化,模拟气泡在尾流中的环境,引入点声源主动入射下的声场分析,模拟尾流在实验室条件下的主动声特性,从而综合得到舰船尾流的主动声特性。

Multi-bubble Models in Ship Wake and Finite Element Analysis

The acoustic characteristics of ship wake depend on that of the bubbles in the wake. A double bubbles model is established in this study according to the distributions of radius and number density of the bubbles in ship wake.Moreover, multi-bubble models are built by using the finite element method and the corresponding software. The node displacement and pressure distribution of the multi-bubble models in the condition of periodically varying load are gained and analyzed. A sound source is introduced into the acoustic field analysis to simulate the environment of the bubbles in ship wake. Experiment is conducted in laboratory to obtained active acoustic characteristic of ship wake through comprehensive analysis.