發(fā)布時(shí)間：2018-03-20 22:20

  本文選題：隨機(jī)不平順　切入點(diǎn)：車輛-軌道-橋梁耦合系統(tǒng)　出處：《蘇州大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：高速鐵路以其安全、快捷、舒適而且經(jīng)濟(jì)的卓越性能,在世界各國得到了快速發(fā)展。橋梁是構(gòu)建高速鐵路的重要基礎(chǔ)設(shè)施之一,列車在橋梁上高速運(yùn)行時(shí),會(huì)引起車-軌-橋耦合系統(tǒng)相互振動(dòng)作用。軌道隨機(jī)不平順作為引起車輛-軌道-橋梁耦合系統(tǒng)振動(dòng)最重要的激勵(lì)源,對列車過橋平穩(wěn)性有著至關(guān)重要的影響。由軌道不平順引起的耦合系統(tǒng)間的相互作用隨列車運(yùn)行速度的不斷提高而越來越嚴(yán)重,所以分析車-軌-橋耦合系統(tǒng)隨機(jī)振動(dòng)響應(yīng)具有重要的實(shí)際意義。本文建立了完整的車輛-軌道-橋梁耦合系統(tǒng)垂向分析模型,根據(jù)達(dá)朗貝爾原理建立列車的振動(dòng)方程,根據(jù)梁的彎曲動(dòng)力學(xué)原理建立軌道和橋梁的振動(dòng)方程,采用線性化的赫茲輪軌接觸理論來模擬輪軌相互作用關(guān)系,形成了耦合系統(tǒng)的振動(dòng)微分方程組。選用德國高速軌道譜作為激勵(lì)源輸入耦合系統(tǒng),并把軌道的隨機(jī)不平順視為平穩(wěn)隨機(jī)過程,將虛擬激勵(lì)法和直接里茲法相組合,避免了計(jì)算結(jié)構(gòu)振型和復(fù)雜的數(shù)值積分,簡單快速地計(jì)算出耦合系統(tǒng)響應(yīng)的功率譜密度,并采用三角級數(shù)法將系統(tǒng)的響應(yīng)功率譜反演為時(shí)域內(nèi)的幅值響應(yīng)。分析比較了軌道不平順等級、列車運(yùn)行速度、列車懸掛參數(shù)對列車-軌道-橋梁耦合系統(tǒng)動(dòng)力響應(yīng)的影響,并求得不同速度下列車敏感的不平順波長范圍。經(jīng)過分析得到,列車運(yùn)行速度越大,過橋平穩(wěn)性指標(biāo)越大,即舒適性越差;而且影響列車平穩(wěn)性的不平順波長越長,其影響范圍越大。本文的研究工作可以為高速列車的結(jié)構(gòu)設(shè)計(jì)、鐵路線路及橋梁的維護(hù)提供重要參考。
[Abstract]:The high-speed railway is safe, quick, comfortable and excellent performance of the economy has been developing rapidly in the world. The bridge is one of the important infrastructure of high-speed railway construction, the train on the bridge at high speed, the mutual effect of vibration will cause the vehicle track bridge coupling system. As the track irregularity caused by coupling system of vehicle track bridge vibration excitation source is the most important, has a crucial impact on the stability of the train bridge. The track irregularity coupling system caused by interactions with the increase of train speed is more and more serious, so the analysis of vehicle track bridge coupling system has important practical significance of the random vibration response this paper established a coupling system. The complete vehicle track bridge vertical analysis model, according to the Darren Bell principle to establish the vibration equation of the train, according to the principle of the establishment of dynamic bending beam The vibration equations of the track and bridge, by using Hertz contact theory of wheel / rail linearization is used to simulate the interaction between wheel and rail, the formation of differential equations for vibration coupling system. The German high-speed track spectrum as the excitation input coupling system, and the random rough track along as a stationary stochastic process, the pseudo excitation method and Ritz the combination method, avoids the complicated calculation and numerical integral structure mode, simple and fast computation of the power coupling system response spectral density, and using trigonometric series method will response power spectrum inversion system response amplitude in time domain. Analysis and comparison of the track irregularity level, train speed, parameters of train track bridge coupling system dynamic response of train suspension, and train under different velocity sensitive irregularity wavelength range is obtained. Through the analysis, the train speed increasing, The greater the smoothness index of the bridge is, the poorer the comfort is, and the longer the wavelength of the irregularities affecting the stationarity of the train is, the greater the influence range. The research work in this paper can provide important reference for the structural design of high-speed train, the maintenance of railway lines and bridges.

【學(xué)位授予單位】：蘇州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U211.3;U441.3

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