本文選題：高速鐵路　切入點(diǎn)：高架橋　出處：《蘭州交通大學(xué)》2014年碩士論文

【摘要】：高速列車運(yùn)行時(shí)輪軌系統(tǒng)相互耦合作用使高架橋梁產(chǎn)生振動，這一振動通過高架橋梁及地面向線路四周進(jìn)行傳遞，同時(shí)激起包括周圍建筑物在內(nèi)的一系列結(jié)構(gòu)的振動與二次噪聲，這些結(jié)構(gòu)振動與二次噪聲嚴(yán)重影響了人們的正常生活和建筑結(jié)構(gòu)的安全。高架橋梁結(jié)構(gòu)二次噪聲正是由于輪軌耦合振動引起的，而目前對高架橋梁結(jié)構(gòu)振動與二次噪聲的產(chǎn)生機(jī)理與高架結(jié)構(gòu)的減振降噪的方法研究工作并不多，所以對高速鐵路高架橋梁結(jié)構(gòu)振動噪聲產(chǎn)生機(jī)理的研究顯得非常重要。 本文基于鐵路大系統(tǒng)動力學(xué)理念，將車輛—軌道—高架橋梁相互耦合動力學(xué)理論與聲學(xué)邊界元相結(jié)合，以雙塊式無砟軌道高架箱型橋梁為研究對象，借助數(shù)值仿真技術(shù)手段對其進(jìn)行結(jié)構(gòu)振動響應(yīng)分析及線路周圍聲場輻射噪聲的研究。 通過多體動力學(xué)軟件SIMPACK建立高速列車仿真模型和賦予其結(jié)構(gòu)參數(shù)，以德國低干擾軌道譜做為車輛—軌道耦合系統(tǒng)的激擾計(jì)算輪軌垂向力；利用大型有限元分析軟件ANSYS建立雙塊式無砟軌道高架箱型橋梁結(jié)構(gòu)模型對其進(jìn)行自振分析，并把輪軌力作為載荷條件輸入到橋梁有限元模型中進(jìn)行瞬態(tài)分析，獲得其結(jié)構(gòu)動力響應(yīng)結(jié)果。通過ANSYS軟件與聲學(xué)軟件LMS.Virtual.LAB軟件之間的接口，將雙塊式無砟軌道高架箱型橋梁結(jié)構(gòu)模型導(dǎo)入LMS.Virtual.LAB中，建立聲場邊界元模型和場點(diǎn)網(wǎng)格，，并把瞬態(tài)分析結(jié)果作為激勵(lì)邊界條件輸入到聲學(xué)模塊中進(jìn)行聲學(xué)分析，獲得各個(gè)場點(diǎn)的振動輻射噪聲評價(jià)指標(biāo)特性及聲場分布。 利用上述方法建立的仿真模型計(jì)算了不同列車速度和鋼軌扣件參數(shù)對雙塊式無砟軌道高架箱型橋梁振動噪聲的影響，從而更準(zhǔn)確描述雙塊式無砟軌道高速鐵路高架橋梁結(jié)構(gòu)振動噪聲產(chǎn)生的機(jī)理，為以后的高速鐵路高架橋梁結(jié)構(gòu)振動噪聲的減振降噪提供可靠的理論依據(jù)。
[Abstract]:The vibration of the elevated bridge is caused by the coupling of the wheel-rail system when the high-speed train is running. The vibration is transmitted through the viaduct and around the ground facing the line. At the same time arousing vibration and secondary noise of a series of structures, including surrounding buildings, These structural vibration and secondary noise seriously affect the normal life of people and the safety of the building structure. The secondary noise of elevated bridge structure is caused by the wheel-rail coupling vibration. At present, there is not much research on the mechanism of vibration and secondary noise of elevated bridge structure and the method of reducing vibration and noise of elevated bridge structure, so it is very important to study the mechanism of vibration and noise generation of elevated bridge structure of high-speed railway. Based on the concept of large-scale railway system dynamics, this paper combines the theory of vehicle-track viaduct coupling dynamics with acoustic boundary element, and takes the double-block ballastless track elevated box bridge as the research object. By means of numerical simulation, the vibration response of the structure and the radiated noise of the sound field around the line are studied. The simulation model of high-speed train is established and its structural parameters are given by the multi-body dynamics software SIMPACK. The wheel / rail vertical force is calculated by using the low interference track spectrum of Germany as the excitation of the vehicle-track coupling system. The self-vibration analysis of the double-block ballastless track elevated box bridge structure is carried out by using the large-scale finite element analysis software ANSYS, and the wheel-rail force is input into the bridge finite element model as the load condition for transient analysis. Through the interface between the ANSYS software and the acoustic software LMS.Virtual.LAB, the two-block ballastless track box bridge model is introduced into LMS.Virtual.LAB, and the sound field boundary element model and the field point grid are established. The transient analysis result is input into the acoustic module as the excitation boundary condition, and the evaluation index characteristics and the sound field distribution of the vibration radiation noise at each field point are obtained. The effects of different train speed and rail fastener parameters on vibration and noise of double-block ballastless track elevated box bridge are calculated by using the simulation model established by the above method. Thus, the mechanism of vibration and noise generation of high speed railway bridge structure with double block ballastless track is described more accurately, which provides a reliable theoretical basis for the vibration and noise reduction of high speed railway elevated bridge structure in the future.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.3;U213.244

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