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基于车桥耦合的高架槽形梁结构噪声影响分析

发布时间:2019-01-11 08:58
【摘要】:为了探讨列车通过轨道交通高架槽形梁时诱发的结构噪声,以某拟建30 m轨道交通槽形梁为研究对象,建立车桥耦合系统振动分析模型以及槽形梁结构声辐射有限元/边界元模型。采用多体动力学软件Simpack建立列车的空间动力学模型,采用有限元软件Ansys建立槽形梁有限元模型,基于Simpack和Ansys相结合的联合仿真方法,获取轮轨激振力。在计算列车荷载作用下槽形梁结构振动响应的基础上,采用有限元-间接边界元耦合声学分析法,探讨底板厚度以及腹板高度对槽形梁结构噪声的影响。研究结果表明:底板厚度的增加可以降低槽形梁梁体正下方的结构噪声,但并非越厚越好,底板厚度对结构远声场有一定程度的影响,但降噪效果不明显;腹板高度的变化使槽形梁结构噪声辐射衰减方向有所改变,桥梁腹板两侧噪声辐射衰减速度较快;桥梁底板正上方的结构辐射噪声最强区域有缩小趋势;分析结果可为轨道交通槽形梁结构减振降噪优化设计提供一定的理论参考依据。
[Abstract]:In order to investigate the structural noise induced by the train passing through the elevated groove beam of rail transit, a 30 m rail transit slot beam is taken as the research object. The vibration analysis model of vehicle-bridge coupling system and the finite element / boundary element model of acoustic radiation of grooved beam structure are established. The spatial dynamic model of train is established by Simpack and the finite element software Ansys is used to establish the finite element model of grooved beam. Based on the combined simulation method of Simpack and Ansys, the exciting force of wheel and rail is obtained. Based on the calculation of vibration response of grooved beam structure under train load, the influence of the thickness of bottom plate and the height of web plate on the structural noise of grooved beam is discussed by using the coupled acoustic analysis method of finite element and indirect boundary element. The results show that the increase of the thickness of the bottom plate can reduce the noise directly below the beam body, but not the thicker the better, the thickness of the bottom plate has a certain degree of influence on the far sound field of the structure, but the effect of noise reduction is not obvious. The change of the height of the web makes the direction of the noise radiation attenuation of the grooved beam structure change, and the attenuation speed of the noise radiation on the two sides of the bridge web plate is faster, and the strongest region of the structure radiation noise above the bridge bottom plate has a tendency to shrink. The analysis results can provide a theoretical reference for the optimal design of vibration and noise reduction of grooved beam structure of rail transit.
【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】:国家自然科学基金资助项目(51268014,51578238) 江西省“赣鄱英才555工程”领军人才培养计划资助项目
【分类号】:U441.3

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