新建高速铁路轨道箱梁振动与噪声研究
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华东交通大学铁路环境振动与噪声教育部工程研究中心

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国家自然科学(52178424,51868023);江西省自然科学重点(20224ACB204018);江西省科技专项(20223AEI91004),江西省教育厅课题(GJJ2205122)


Research on Vibration and Noise of Box Girders in Newly Built High Speed Railway Tracks
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    摘要:

    为探究采用不同轨道类型的高速铁路轨道箱梁结构振动与噪声特性,论文通过有限元法与多体动力学,建立高速列车-无砟轨道-高架箱梁耦合动力学模型,研究列车高速通过时,列车、轨道、箱梁的结构动力响应。并建立边界元模型,探究高架箱梁铺设不同类型无砟轨道时,结构的噪声特性。结果表明,列车通过铺设III型板与双块式的高架箱梁时,列车的最大轮重减载率分别为0.0 536与0.1 657,桥梁挠度分别为1/9 673与1/8 457。III型板的轨道板及底座振动位移更小,并且轨道箱梁结构的竖向振动传递率更小,减振性能更好。采用两种轨道结构的高架箱梁的噪声特性在桥下远点差异很小,峰值频率均为31.5Hz;而在桥下差异较大,III型板的峰值频率为63Hz而双块式则为20Hz,但峰值差异很小。且采用III型板的箱梁噪声总声压级更小。

    Abstract:

    To explore the vibration and noise characteristics of high-speed railway track box girder structures using different track types, the paper establishes a coupled dynamic model of high-speed train-ballastless track elevated- box girder through finite element method and multi body dynamics, and studies the structural dynamic response of trains, tracks, and box girders when trains pass at high speeds. And establish a boundary element model to explore the noise characteristics of the structure when laying different types of ballastless tracks on elevated box girders. The results show that when the train passes through the laying of Type III plates and double block elevated box girders, the maximum wheel load reduction rates of the train are 0.0 536 and 0.1 657, respectively, and the bridge deflection is 1/9 673 and 1/8 457, respectively. The vibration displacement of the track plate and base of Type III plate is smaller, and the vertical vibration transmission rate of the track box beam structure is smaller, resulting in better vibration reduction performance. The noise characteristics of elevated box girders using two types of track structures have little difference at the far point below the bridge, with peak frequencies of 31.5Hz; However, there is a significant difference under the bridge, with a peak frequency of 63Hz for the Type III plate and 20Hz for the dual block type, but the peak difference is very small. And the total sound pressure level of the box beam noise

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历史
  • 收稿日期:2023-11-17
  • 最后修改日期:2024-01-19
  • 录用日期:2024-01-24
  • 在线发布日期: 2024-03-25
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