【摘要】：軌道交通系統(tǒng)引起的高架結(jié)構(gòu)振動與輻射噪聲的研究涉及到結(jié)構(gòu)工程的許多研究領(lǐng)域。在理論上也有許多工作要做,在實際工程應(yīng)用方面也有廣泛的應(yīng)用前景。槽形梁與箱梁、T梁相比,具有建筑高度低、噪聲污染小、外形美觀等諸多優(yōu)點,其是適合于軌道交通高架橋的一種優(yōu)秀的新型結(jié)構(gòu)形式。本文正是適應(yīng)這一需要,研究車輛荷載作用下槽型橋梁的輻射噪聲在高架結(jié)構(gòu)中的分布規(guī)律和特點。并與箱型梁及T型梁的輻射噪聲分布進行比較。 首先綜述了結(jié)構(gòu)振動響應(yīng)分析的理論基礎(chǔ)、聲場分析計算的理論基礎(chǔ)以及聲輻射計算的流程。提出利用有限元—邊界元相結(jié)合的算法計算結(jié)構(gòu)的聲輻射噪聲,并比較了邊界元方法中的直接邊界元和間接邊界元的共同和不同之處,綜合比較之后,提出利用間接邊界元法計算振動輻射噪聲和利用直接邊界元法計算輪軌噪聲輻射場。通過有限元程序ANSYS、聲學(xué)軟件Virtual.Lab Acoustics和Sysnoise的結(jié)合,對槽型梁、箱型梁及T型梁的結(jié)構(gòu)振動聲輻射特性進行仿真分析。比較車輛荷載作用下不同橋梁的動力響應(yīng)及輻射聲場,通過時程分析及頻譜分析,對槽型梁振動輻射噪聲的聲壓分布及傳播規(guī)律進行分析研究。通過實測輪軌噪聲源數(shù)據(jù),利用聲學(xué)軟件Sysnoise模擬輪軌噪聲,研究槽型梁和箱型梁及T型梁的輪軌噪聲聲場在頻域和空間上的分布特性。通過改變列車的運行參數(shù),研究其對橋梁振動輻射噪聲和輪軌噪聲的影響規(guī)律,為軌道交通的降噪研究提供有益的參考價值。
[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.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U211.3;U441.3

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