城市轨道交通单线U型梁振动与噪声分析

发布时间：2018-06-09 00:57

本文选题：U型梁 + 振动　；参考：《铁道工程学报》2017年05期

【摘要】：研究目的:针对日益严重的桥梁结构低频噪声问题,本文建立钢轨、无砟轨道、桥梁结构的梁-板振动有限元预测模型,分析城市轨道交通单线U型梁在垂向轮轨力作用下20~200 Hz范围内频域的振动及其近场、远场的结构噪声特性,同时分析U型梁各板件的声贡献量。通过对U型梁进行振动噪声分析,提出截面优化建议。研究结论:(1)U型梁的振动幅值峰值出现在31.5~63 Hz左右,翼板的振动幅值最大,其次是底板和腹板;(2)由钢轨到U型梁的振动功率级损失在16.9~20 dB左右,U型梁各板件的振动功率级与其声压贡献量的规律基本一致,底板腹板翼板;(3)在近场点各板件的声压级峰值都在50 Hz,底板的声压级最大,其次是腹板和翼板;(4)远场噪声主要受底板的作用影响,其声压贡献量达到81%左右,因此应作为主要降噪对象,而翼板的振动峰值虽大,但对声场的影响很小,几乎可以忽略不计;(5)该研究成果可为城市轨道交通的桥梁采取减振降噪措施提供借鉴。
[Abstract]:Research purpose: aiming at the increasingly serious problem of low frequency noise of bridge structure, the finite element prediction model of beam-plate vibration of rail, ballastless track and bridge structure is established in this paper. The vibration in frequency domain and the structural noise characteristics in the near field and far field of single line U-shaped beam of urban rail transit under the action of vertical wheel-rail force are analyzed. At the same time, the acoustic contribution of each plate of U-shaped beam is analyzed. By analyzing the vibration and noise of U-beam, the section optimization suggestion is put forward. It is concluded that the peak value of vibration amplitude of the U-shaped beam is about 31.5 ~ 63 Hz, and the vibration amplitude of the wing plate is the largest. Secondly, the loss of vibration power level from rail to U-beam is about 16.9 ~ 20 dB. The vibration power level of each plate of U-beam is basically consistent with the rule of the contribution of sound pressure. The sound pressure level of each plate is at 50 Hz at the near field point, and the sound pressure level of the bottom plate is the largest, and the far field noise is mainly affected by the effect of the bottom plate, and the contribution of the sound pressure is about 81%. Therefore, it should be regarded as the main noise reduction object, but the vibration peak value of the airfoil is large, but the influence on the sound field is very small, which can be ignored. 5) this research result can provide reference for the bridge of urban rail transit to take vibration and noise reduction measures.
【作者单位】：华东交通大学铁路环境振动与噪声教育部工程研究中心;
【基金】：国家自然科学基金(51468021) 江西省杰出青年人才资助计划(20162BCB23048) 江西省自然科学基金(20161BAB206160)
【分类号】：U211.3;U441.3

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