發(fā)布時間：2018-11-25 08:37

【摘要】：在高速鐵路的高速迅猛發(fā)展的當(dāng)今社會,工程上對速度、安全和乘客舒適性上的要求越來越高�？紤]列車運行的安全性,需要控制基礎(chǔ)沉降,憑借著自身基礎(chǔ)沉降量小的優(yōu)勢,橋梁建設(shè)中80%以上為簡支梁橋。在高速鐵路橋梁設(shè)計中,高速列車對橋梁的動力響應(yīng)與在普通列車作用下有所不同,這使得高速列車通過的橋梁設(shè)計與普通列車通過的橋梁不相同,所以研究高速列車對橋梁的動力作用對橋梁設(shè)計工作具有實際的指導(dǎo)意義。本文主要研究內(nèi)容如下:1、首先進(jìn)行了單軸彈簧質(zhì)量系統(tǒng)模型的運動平衡方程的推導(dǎo),然后對方程采用Newmark法進(jìn)行分離迭代求解,接著編制了車橋耦合分析程序。2、采用10自由度的兩系懸掛垂向車輛模型,用推導(dǎo)了兩對以及n對輪作用下車橋耦合振動模型的控制方程,編寫出了車橋耦合振動模型控制方程的MATLAB迭代求解程序。分析了不同列車速度及不同軌道不平順條件下系統(tǒng)的隨機(jī)振動特性,并得出不平順干擾譜越高,調(diào)制函數(shù)系數(shù)越大,系統(tǒng)響應(yīng)越大的結(jié)論。3、首先討論了在諧和激勵作用下,單自由度振動系統(tǒng)的TMD優(yōu)化參數(shù)的設(shè)計。接著建立了在采用列車荷載對主橋結(jié)構(gòu)的作用作為隨機(jī)激勵的情況下,MTMD和結(jié)構(gòu)振動控制振型坐標(biāo)構(gòu)成的新系統(tǒng)動力平衡方程。選取實際橋梁,設(shè)計了MTMD,進(jìn)而分析了MTMD控制下車輛橋梁系統(tǒng)的動力響應(yīng)。
[Abstract]:With the rapid development of high-speed railway, the engineering demands on speed, safety and passenger comfort are becoming higher and higher. Considering the safety of train operation, it is necessary to control the foundation settlement. With the advantage of small settlement of its own foundation, more than 80% of the bridge construction is simply supported beam bridge. In the design of high-speed railway bridge, the dynamic response of high-speed train to bridge is different from that of ordinary train, which makes the bridge design of high-speed train different from that of ordinary train. Therefore, studying the dynamic effect of high-speed train on bridge has practical guiding significance for bridge design. The main contents of this paper are as follows: 1. First, the equation of motion balance of the mass system model of single axis spring is derived, then the equation is solved by Newmark method, and then the vehicle-bridge coupling analysis program is compiled. In this paper, a two-system suspension vertical vehicle model with 10 degrees of freedom is used. The governing equations of the vehicle-bridge coupling vibration model under the action of two pairs and n pairs of wheels are derived, and the MATLAB iterative solution program for the control equation of the vehicle-bridge coupled vibration model is developed. The random vibration characteristics of the system under different train velocities and different track irregularity are analyzed. It is concluded that the higher the irregularity interference spectrum is, the larger the modulation function coefficient is, and the greater the system response is. 3. Firstly, the harmonic excitation is discussed. The design of TMD optimization parameters for single degree of freedom vibration system. Then, a new system dynamic equilibrium equation is established, in which the action of train load on the structure of the main bridge is used as random excitation, and a new system dynamic equilibrium equation is established, which is composed of MTMD and the vibration control mode coordinates of the structure. MTMD, is designed to analyze the dynamic response of vehicle bridge system under the control of MTMD.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441.3;U270.11

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