本文選題：車(chē)-橋耦合振動(dòng) + 迭代模型�。� 參考：《湖南大學(xué)學(xué)報(bào)(自然科學(xué)版)》2016年11期

【摘要】：采用改進(jìn)的車(chē)-橋耦合系統(tǒng)迭代計(jì)算模型,建立了基于虛擬激勵(lì)法(PEM)的列車(chē)-軌道-橋梁豎向隨機(jī)振動(dòng)分析模型.采用虛擬激勵(lì)法將軌道不平順精確地轉(zhuǎn)化為一系列豎向簡(jiǎn)諧不平順的疊加,并運(yùn)用分離迭代法求解車(chē)-橋耦合系統(tǒng)振動(dòng)方程.以CRH2高速列車(chē)通過(guò)5跨簡(jiǎn)支梁橋?yàn)槔?對(duì)改進(jìn)的車(chē)-橋耦合系統(tǒng)迭代計(jì)算模型的計(jì)算精度和效率進(jìn)行了驗(yàn)證.結(jié)果表明:在保持與傳統(tǒng)模型相同計(jì)算精度的前提下,改進(jìn)模型能使計(jì)算效率提高5倍左右.通過(guò)對(duì)列車(chē)-軌道-簡(jiǎn)支梁橋豎向隨機(jī)振動(dòng)響應(yīng)中確定性激勵(lì)引起的均值和軌道不平順引起的均方根進(jìn)行分析可知:橋梁豎向位移主要受列車(chē)自重控制,軌道不平順引起的橋梁豎向位移影響很小;橋梁和車(chē)體豎向加速度受軌道不平順影響顯著,改善線路條件能有效提高列車(chē)的乘車(chē)舒適性;同時(shí),車(chē)速越高,橋梁和車(chē)輛隨機(jī)響應(yīng)的均方根越大,由軌道不平順引起的耦合系統(tǒng)振動(dòng)響應(yīng)的離散度越大.
[Abstract]:Based on the improved iterative model of vehicle-bridge coupling system, the vertical random vibration analysis model of train-track bridge based on virtual excitation method (PEM) is established. The track irregularity is transformed into a series of superposition of vertical harmonic irregularity by virtual excitation method, and the vibration equation of vehicle-bridge coupling system is solved by separating iteration method. The calculation accuracy and efficiency of the improved iterative calculation model for the vehicle-bridge coupling system are verified by taking the CRH2 high-speed train passing through the 5-span simply supported beam bridge as an example. The results show that the improved model can increase the calculation efficiency by about 5 times on the premise of maintaining the same calculation precision as the traditional model. Through the analysis of the mean value caused by deterministic excitation in the vertical random vibration response of train-track simply supported beam bridge and the root mean square caused by track irregularity, it can be concluded that the vertical displacement of the bridge is mainly controlled by train deadweight. The vertical displacement of the bridge caused by track irregularity is very small, the vertical acceleration of bridge and car body is significantly affected by track irregularity, improving the line conditions can effectively improve the ride comfort of the train; at the same time, the higher the speed, the higher the speed. The larger the root-mean-square root of the random response of bridge and vehicle is, the greater the discrete degree of vibration response of coupled system caused by track irregularity is.
【作者單位】： 中南大學(xué)土木工程學(xué)院;中南大學(xué)高速鐵路建造技術(shù)國(guó)家工程實(shí)驗(yàn)室;西南交通大學(xué)牽引動(dòng)力國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51378511,51678576) 牽引動(dòng)力國(guó)家重點(diǎn)實(shí)驗(yàn)室開(kāi)放課題(TPL1601)~~
【分類(lèi)號(hào)】：U441.3

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