列车荷载作用下常用跨度槽型梁噪声场分布特性研究
发布时间：2018-07-14 11:54
【摘要】：轨道交通系统引起的高架结构振动与辐射噪声的研究涉及到结构工程的许多研究领域。在理论上也有许多工作要做,在实际工程应用方面也有广泛的应用前景。槽形梁与箱梁、T梁相比,具有建筑高度低、噪声污染小、外形美观等诸多优点,其是适合于轨道交通高架桥的一种优秀的新型结构形式。本文正是适应这一需要,研究车辆荷载作用下槽型桥梁的辐射噪声在高架结构中的分布规律和特点。并与箱型梁及T型梁的辐射噪声分布进行比较。 首先综述了结构振动响应分析的理论基础、声场分析计算的理论基础以及声辐射计算的流程。提出利用有限元—边界元相结合的算法计算结构的声辐射噪声,并比较了边界元方法中的直接边界元和间接边界元的共同和不同之处,综合比较之后,提出利用间接边界元法计算振动辐射噪声和利用直接边界元法计算轮轨噪声辐射场。通过有限元程序ANSYS、声学软件Virtual.Lab Acoustics和Sysnoise的结合,对槽型梁、箱型梁及T型梁的结构振动声辐射特性进行仿真分析。比较车辆荷载作用下不同桥梁的动力响应及辐射声场,通过时程分析及频谱分析,对槽型梁振动辐射噪声的声压分布及传播规律进行分析研究。通过实测轮轨噪声源数据,利用声学软件Sysnoise模拟轮轨噪声,研究槽型梁和箱型梁及T型梁的轮轨噪声声场在频域和空间上的分布特性。通过改变列车的运行参数,研究其对桥梁振动辐射噪声和轮轨噪声的影响规律,为轨道交通的降噪研究提供有益的参考价值。
[Abstract]:The research of viaducture vibration and radiated noise caused by rail transit system involves many research fields of structural engineering. There is also a lot of work to be done in theory and a wide range of application prospects in practical engineering applications. Compared with T-beam of box girder, slot girder has many advantages, such as low building height, low noise pollution, beautiful appearance and so on. It is an excellent new type of structure for rail transit viaduct. In this paper, the distribution and characteristics of radiation noise of grooved bridges under vehicle loads in elevated structures are studied. The radiation noise distribution of box girder and T beam is compared. Firstly, the theoretical basis of structural vibration response analysis, the theoretical basis of acoustic field analysis and the flow chart of acoustic radiation calculation are summarized. An algorithm combining finite element and boundary element is proposed to calculate the acoustic radiation noise of the structure, and the common and different aspects of the direct boundary element and indirect boundary element in the boundary element method are compared. The indirect boundary element method and the direct boundary element method are used to calculate the radiation field of wheel-rail noise. By the combination of finite element program ANSYSand acoustics software Virtual.Lab Acoustics and Sysnoise, the acoustic radiation characteristics of slot beam, box beam and T-beam are simulated and analyzed. The dynamic response and radiation sound field of different bridges under vehicle loads are compared. The sound pressure distribution and propagation law of vibration radiation noise of slot beam are analyzed by time-history analysis and frequency spectrum analysis. Based on the measured data of wheel-rail noise sources and using the acoustic software Sysnoise to simulate wheel-rail noise, the distribution characteristics of wheel-rail noise field in frequency domain and space of grooved beam, box beam and T-shaped beam are studied. By changing the operating parameters of the train, the influence of the train on the vibration radiation noise and wheel-rail noise of the bridge is studied, which provides a useful reference value for the research on the noise reduction of the rail transit.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U211.3;U441.3
本文编号：2121566
[Abstract]:The research of viaducture vibration and radiated noise caused by rail transit system involves many research fields of structural engineering. There is also a lot of work to be done in theory and a wide range of application prospects in practical engineering applications. Compared with T-beam of box girder, slot girder has many advantages, such as low building height, low noise pollution, beautiful appearance and so on. It is an excellent new type of structure for rail transit viaduct. In this paper, the distribution and characteristics of radiation noise of grooved bridges under vehicle loads in elevated structures are studied. The radiation noise distribution of box girder and T beam is compared. Firstly, the theoretical basis of structural vibration response analysis, the theoretical basis of acoustic field analysis and the flow chart of acoustic radiation calculation are summarized. An algorithm combining finite element and boundary element is proposed to calculate the acoustic radiation noise of the structure, and the common and different aspects of the direct boundary element and indirect boundary element in the boundary element method are compared. The indirect boundary element method and the direct boundary element method are used to calculate the radiation field of wheel-rail noise. By the combination of finite element program ANSYSand acoustics software Virtual.Lab Acoustics and Sysnoise, the acoustic radiation characteristics of slot beam, box beam and T-beam are simulated and analyzed. The dynamic response and radiation sound field of different bridges under vehicle loads are compared. The sound pressure distribution and propagation law of vibration radiation noise of slot beam are analyzed by time-history analysis and frequency spectrum analysis. Based on the measured data of wheel-rail noise sources and using the acoustic software Sysnoise to simulate wheel-rail noise, the distribution characteristics of wheel-rail noise field in frequency domain and space of grooved beam, box beam and T-shaped beam are studied. By changing the operating parameters of the train, the influence of the train on the vibration radiation noise and wheel-rail noise of the bridge is studied, which provides a useful reference value for the research on the noise reduction of the rail transit.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U211.3;U441.3
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