| 基于瞬态边界元法的箱梁声辐射 |
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| 引用本文： | 尹镪,蔡成标,陈兆玮.基于瞬态边界元法的箱梁声辐射[J].西南交通大学学报,2015,28(6):1100-1105. |
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| 作者姓名： | 尹镪 蔡成标 陈兆玮 |
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| 基金项目： | 国家863计划资助项目(2011AA11A103-3-1-1)国家973计划资助项目(2013CB036202,2013CB036206) |
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| 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.
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| 关 键 词： | 箱梁桥 有限元-瞬态边界元法 振动响应 瞬态声辐射特性 |
| 收稿时间： | 2015-03-09 |
Characteristics Analysis of Sound Radiation of Box Girder Based on Transient Boundary Element Method |
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| YIN Qiang,CAI Chengbiao,CHEN Zhaowei.Characteristics Analysis of Sound Radiation of Box Girder Based on Transient Boundary Element Method[J].Journal of Southwest Jiaotong University,2015,28(6):1100-1105. |
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| Authors: | YIN Qiang CAI Chengbiao CHEN Zhaowei |
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| Abstract: | Based on the finite element-transient boundary element method, the time-domain vibration characteristics and the acoustic radiation characteristics of a 32 m-span simply supported box girder railway bridge were analyzed. Firstly, the rail-bridge finite element model was established utilizing the finite element software ANSYS, and the wheel/rail force was obtained by the train-track-bridge interaction simulation software (TTBSIM). Then, the wheel/rail force was applied to the finite element model as the external excitation, and the vibration responses of the bridge under the dynamic loading were analyzed. Finally, the radiated noise caused by the dynamic loads was analyzed based on the boundary condition of box girder vibration response by adopting the acoustic boundary element analysis software Sysnoise. Further, the calculated results were compared with the measured ones to valid the model. The results show that when the high-speed train runs at the speed of 200 km/h, the vibration of bridge deck is significantly greater than those of the bottom plate and girder web, and the bridge deck is the main site for noise radiation. The bridge structural noise mainly falls in the range of low frequencies. With the distance increasing, the noise amplitude decreases, and the attenuation of the high-frequency noise is significantly faster than the low-frequency noise. |
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