基于声学灵敏度的槽形梁结构参数影响分析  

Study on Structure-acoustic Sensitivity Analysis of Trough Girders for Rail Transit

作　　者：刘林芽[1] 秦佳良 宋瑞[1] 曾峰[1] LIU Lin-ya;QIN Jia-liang;SONG Rui;ZENG Feng(Engineering Research Center of Railway Environment Vibration and Noise, Ministry of Education,East China Jiaotong University, Nanchang 330013, China)

机构地区：[1]华东交通大学铁路环境振动与噪声教育部工程研究中心,南昌330013

出　　处：《噪声与振动控制》2017年第5期88-91,共4页Noise and Vibration Control

基　　金：江西省创新团队资助项目(2015BCB24007);江西省研究生创新专项资金资助项目(YC2016-s248)

摘　　要：为研究槽形梁结构参数对结构噪声的影响,基于车辆-轨道耦合动力学理论,建立轨道交通槽形梁的有限元模型,并计算列车荷载作用下槽形梁结构振动响应,采用间接边界元法计算分析轨道交通槽形梁结构噪声特性。最后再利用有限差分法计算槽形梁结构-声学灵敏度,分析槽形梁底板厚度、腹板厚度和翼缘板厚度对不同声场场点的线性声压级在不同频率处的影响。研究结果表明:轨道交通槽形梁结构噪声的峰值频率在31.5 Hz^80 Hz之间。加厚底板有利于控制桥梁附近小范围内的结构噪声,对远场点的噪声无能为力;加厚腹板会增大近场点的最大声压级,但对远场点噪声具有一定的降噪作用。而且加厚底板和加厚腹板对在100 Hz以上频段场点声压的影响比较小,翼缘板厚度对槽形梁结构噪声的影响也很小。In order to study the influence of structural parameters of trough girders on structure-borne noise,the finite element model of the trough girder is established based on the theory of vehicle-track coupling dynamics,and the vibration response of the trough girder under the train load excitation is calculated.The indirect boundary element method is used to calculate and analyze the noise characteristics of the trough girder.Then,the finite difference method is used to calculate the structure-acoustic sensitivity of the trough girder.The impact of the floor,the flange and web thicknesses on the sound pressure level in acoustic field in different frequency ranges are analyzed.The results show that the peak frequency of the noise of the rail transit trough girder is31.5Hz-80Hz.Thickening the floor will help control the structural noise in a smallarea adjacent to the bridge,but it has little effect on the field far away from the bridge.Thickening the web will increase the maximum sound pressure level in the field near the bridge,and also has some effect on noise reduction for the far field of the bridge.In addition,thickening the floor and the web simultaneously only has small effect on the sound pressure at the field points for the frequency above100Hz,and the influence of the flange thickness on structure-borne noise of the trough girder is also small.

关 键 词：声学 槽形梁 间接边界元 有限差分法 结构-声学灵敏度 

分 类 号：U233[交通运输工程—道路与铁道工程] TB532[理学—物理]