消音器的减振降噪性能分析

Analysis of Vibration and Noise Reduction Performance of Silencers

阐述水下航行器的辐射噪声主要来自各种船舶机械振动导致的壳体振动继而引发的声辐射。辐射噪声是水下暴露舰船目标的重要原因,为了增加舰船的隐蔽性,减弱这类噪声势在必行。采用有限元法,建立消音器的物理模型及有限元离散模型,进而研究对消音器减振降噪性能的影响。仿真验证得到球半径越大、模型圆柱半径越大以及半球腔支撑都能很好地消音降噪,同时验证球壳的厚度对消音器的性能有影响,对消音降噪影响不大,这为后续的工程设计提供科学依据,具有重要意义。

This paper expounds that the radiation noise of underwater vehicles mainly comes from the sound radiation caused by the shell vibration caused by various ship mechanical vibrations.Radiated noise is an important cause of underwater exposure of ship targets,and in order to increase the concealment of ships,it is imperative to reduce this type of noise.Using the finite element method,establish a physical model and finite element discrete model of the muffler,and then study the impact on the vibration and noise reduction performance of the muffler.The simulation verification shows that the larger the radius of the sphere,the larger the radius of the model cylinder,and the support of the hemispherical cavity can effectively reduce noise and noise.At the same time,it is verified that the thickness of the spherical shell has an impact on the performance of the silencer,and has little impact on noise reduction.This provides a scientific basis for subsequent engineering design and is of great significance.