基于瞬态边界元法的箱梁声辐射

发布时间：2018-08-06 11:20

【摘要】：为进一步开展桥梁结构噪声的研究,基于有限元-瞬态边界元法理论,对铁路32 m简支箱梁桥进行了时域振动响应及声辐射特性分析.首先,利用有限元软件ANSYS建立轨道-桥梁有限元模型;然后,运用车-线-桥仿真程序(TTBSIM),仿真计算得到轮轨相互作用力,并作为有限元模型的外部激励进行了列车动荷载作用下桥梁的时域振动响应分析;最后,以桥梁振动响应为边界条件,利用声学边界元软件Sysnoise研究分析了由列车动荷载引起的桥梁瞬态辐射噪声,并将测点声压计算值与实测值进行了对比验证.研究结果表明,200 km/h高速列车作用下桥面板振动级明显大于桥底板和桥梁腹板,桥梁主要噪声辐射部位为桥面板;桥梁结构噪声主要集中于低频段;随距离增加,噪声幅值逐渐减小,且高频噪声衰减速度明显快于低频噪声.
[Abstract]:In order to further study the structural noise of bridges, the time-domain vibration response and acoustic radiation characteristics of 32 m simply supported box girder bridges are analyzed based on the theory of finite element method and transient boundary element method. Firstly, the finite element model of rail-bridge is established by using finite element software ANSYS, and then the wheel-rail interaction force is calculated by (TTBSIM), simulation program. As the external excitation of the finite element model, the time-domain vibration response of the bridge under the train dynamic load is analyzed. Finally, the bridge vibration response is taken as the boundary condition. Using acoustic boundary element software Sysnoise, the transient radiation noise of bridge caused by train dynamic load is studied and analyzed, and the calculated value of sound pressure at measured point is compared with the measured value. The results show that the vibration level of bridge deck plate is obviously larger than that of bridge bottom plate and bridge web plate, the main noise radiation part of bridge is bridge deck slab, the bridge structure noise is mainly concentrated in low frequency band, and increases with distance, the vibration level of bridge deck plate is obviously larger than that of bridge bottom plate and bridge web plate under the action of high-speed train. The amplitude of noise decreases gradually, and the attenuation speed of high frequency noise is obviously faster than that of low frequency noise.
【作者单位】：西南交通大学牵引动力国家重点实验室;
【基金】：国家863计划资助项目(2011AA11A103-3-1-1) 国家973计划资助项目(2013CB036202,2013CB036206)
【分类号】：U441

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