基于LMS Virtual.Lab的声屏障结构对其声学特性影响分析  

Acoustic Characteristics Impact Analysis of Noise Barrier Structure Based on LMS Virtual. Lab

作　　者：胡薇[1] 孙凤英[1] 冯霞[1] 

机构地区：[1]东北林业大学交通运输学院,哈尔滨150040

出　　处：《森林工程》2014年第3期91-93,97,共4页Forest Engineering

基　　金：哈尔滨市科技创新人才研究专项资金项目(2012RFXXS089)

摘　　要：从声屏障的降噪理论基础惠更斯理论入手,引入插入损失的概念,并讨论点声源和线声源的衰减及插入损失的计算方法,根据计算方法引出不同结构的声屏障对于插入损失的大小具有一定的影响。本文运用LMS Virtual.Lab软件的几何建模模块（Geometry）,网格划分模块（Meshing）以及声学模块（Acoustics）分别进行仿真,并由其中的结构求解器得出仿真结果。根据仿真结果分析对比直板型、T型、倾斜型和圆弧型结构的声屏障分别在100~2000Hz状态下的插入损失,以及在噪声能量集中的400Hz频率下的位移幅值。根据分析结果对声屏障设计及选择提出相应的建议,为从事声屏障方面研究人员提供一定的参考。Based on Huygens-Fresnel＇s noise barrier principle,this paper introduced the concept of insertion loss and discussed the insertion loss calculation method of point sources and line sources. The sound barrier of different structures has certain effect on the insertion loss. In this paper,the Geometry module,Meshing module and Acoustic Module in LMS Virtual. Lab were applied to construct the model and solved the model using the structure solver to obtain the simulation results. The insertion loss with bar-type,Ttype,tilt-and arc sound barrier structures from 100Hz to 2000Hz was compared and the translational displacement magnitude at 400Hz was analyzed. Based on the results of analysis,some suggestions on the design of sound barrier were put forward,which can provide certain reference for noise barrier researchers.

关 键 词：声屏障 插入损失 Virtual LAB 

分 类 号：S773.6[农业科学—森林工程] TB535[农业科学—林学]