轮轨激励下高速列车头车乘客室室内的声学响应研究  

Interior noise investigation for a passenger room of a high speed train under wheel-rail excitation

作　　者：时彧[1] 肖友刚[2] 康志成[3] 

机构地区：[1]湖南科技大学机电工程学院,湖南湘潭411201 [2]中南大学轨道交通安全教育部重点实验室,长沙410075 [3]井冈山大学工学院,江西吉安343009

出　　处：《振动与冲击》2009年第1期95-98,共4页Journal of Vibration and Shock

基　　金：湖南省自然科学基金重点资助项目(07JJ3098);中国博士后科学基金(2005038227)

摘　　要：建立了某高速列车头车-轨道的耦合动力学仿真模型、车身的有限元模型、乘客室的声学边界元模型,计算出了由轨道不平顺引起的乘客室内的噪声分布状况,得出了如下结论:当列车运行速度为200 km/h时,乘客室内的A声级在61.9 dBA^69.6 dBA之间变化;乘客室内A声级较大的场点在40 Hz、200 Hz频率处的声压级较大;要降低乘客室内的噪声,必须对总声级起决定作用的频率段(40 Hz、200 Hz)采取措施。针对40 Hz的低频噪声,最好修改乘客室的底部结构或采取减振措施,以减少底板的振动幅度;针对200 Hz的中频噪声,则宜在声学贡献最大的面板上采取阻尼降噪措施。A series of models,namely,the vehicle-track coupled dynamic model,the finite element model of the train head,the acoustical boundary element model of a passenger room of a high speed train,were established.The interior noise of the passenger room caused by track irregularities was calculated,and the distribution features of the internal noise of the passenger room were ascertained.The following conclusion were drawn: the noise in the passenger room changes within the range of 61.9～69.6 dBA;at the frequency of 40 Hz and 200 Hz,the sound pressure levels in the passenger room are greater;to reduce the biggest noise in the passenger room,measures must be adopted at 40 Hz and 200 Hz,the key frequencies;at 40 Hz,it is better to add stiffened ribs or a layer of damping material on the panel;at 200 Hz,it will be more suitable to coat with a viscoelastic layer on the panel where the biggest acoustical contribution exists.

关 键 词：高速列车 轮轨激励 乘客室 声学响应 

分 类 号：X839.1[环境科学与工程—环境工程]