铁路钢轨垂向振动的声辐射分析  

Analysis of Rail Acoustic Radiation due to Vertical Vibration

作　　者：万淑敏[1] 吴天行[1] 

机构地区：[1]上海交通大学机械系统与振动国家重点实验室,上海200240

出　　处：《噪声与振动控制》2009年第3期86-89,共4页Noise and Vibration Control

摘　　要：在ANSYS中建立轨道的实体模型,求出钢轨在作用力处的谐响应;与离散轨道模型中钢轨在作用力处的谐响应对比,找到合适的轨道模型,求出钢轨在50-4000 Hz之间1/3倍频带中心频率处的表面谐响应;建立钢轨的边界元模型,把从ANSYS中得到的钢轨表面谐响应导入SYSNO ISE作为钢轨的激励位移边界条件,得到钢轨在50-4000 Hz之间1/3倍频带中心频率处的声辐射效率。与从二维轨道声辐射模型得到的结果吻合。A new method for the analysis of rail acoustic radiation due to vertical vibration is found. A finite element model is established in ANSYS for the rail. The harmonic response of the rail at the force application point is obtained. Comparing the results with those obtained from the discrete rail model, a pertinent rail model is proposed. The harmonic response in the rail surface at the core frequencies of 1/3 octave frequency band between 50-4000Hz is gained. Then, a boundary element model of the rail is established. The harmonic response of the rail surface obtained in the ANSYS is used as the boundary condition of displacement excitation, and is input into the SYSNOISE code. The rail acoustic radiation efficiency at the core frequencies of 1/3 octave frequency band between 50-4000Hz is then obtained. The result is in agreement with the one obtained from the 2D sound radiation model of the rail. Thus, the feasibility of this method is verified.

关 键 词：声学 钢轨 声辐射 谐响应 

分 类 号：U213.2[交通运输工程—道路与铁道工程]