基于MATLAB的车桥耦合动力学分析
发布时间：2018-11-25 08:37
【摘要】：在高速铁路的高速迅猛发展的当今社会,工程上对速度、安全和乘客舒适性上的要求越来越高。考虑列车运行的安全性,需要控制基础沉降,凭借着自身基础沉降量小的优势,桥梁建设中80%以上为简支梁桥。在高速铁路桥梁设计中,高速列车对桥梁的动力响应与在普通列车作用下有所不同,这使得高速列车通过的桥梁设计与普通列车通过的桥梁不相同,所以研究高速列车对桥梁的动力作用对桥梁设计工作具有实际的指导意义。本文主要研究内容如下:1、首先进行了单轴弹簧质量系统模型的运动平衡方程的推导,然后对方程采用Newmark法进行分离迭代求解,接着编制了车桥耦合分析程序。2、采用10自由度的两系悬挂垂向车辆模型,用推导了两对以及n对轮作用下车桥耦合振动模型的控制方程,编写出了车桥耦合振动模型控制方程的MATLAB迭代求解程序。分析了不同列车速度及不同轨道不平顺条件下系统的随机振动特性,并得出不平顺干扰谱越高,调制函数系数越大,系统响应越大的结论。3、首先讨论了在谐和激励作用下,单自由度振动系统的TMD优化参数的设计。接着建立了在采用列车荷载对主桥结构的作用作为随机激励的情况下,MTMD和结构振动控制振型坐标构成的新系统动力平衡方程。选取实际桥梁,设计了MTMD,进而分析了MTMD控制下车辆桥梁系统的动力响应。
[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.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3;U270.11
[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.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3;U270.11
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