桁架梁桥列车抖振气动力试验研究
发布时间：2018-12-16 16:05
【摘要】：随着我国高速铁路的发展,列车运行速度越来越快,同时铁路桥梁的跨度也越来越大,在自然风的作用下,车桥系统的动力作用将越来越明显。为了提高列车通过桥梁时的安全性,有必要对车桥系统进行更加精细化的研究。抖振是自然风中的脉动成分引起的一种限幅振动,列车高速通过桥梁时,过大的振动虽不能带来致命的危险,但也会使乘客的舒适性大打折扣。基于此本文对车桥系统抖振力的一些关键参数进行了试验研究。本文采用理论分析和风洞试验相结合的方法,以一大跨铁路桁架桥为背景,测量了车桥系统中列车的三分力系数、研究了紊流风作用下列车断面气动力的跨向相关性,并识别出了列车的气动导纳,提出了列车气动导纳的经验公式。本文主要研究内容如下：1)介绍了桥梁的风致振动现象,回顾了气动导纳的研究现状并对列车气动力的研究内容进行了说明。2)对大气边界层的紊流特性进行了描述,在风洞中模拟了两种紊流场,分析了模拟紊流场的紊流特性。3)对列车的绕流进行了说明,分析了自然风作用于车桥系统列车上的定常气动力和非定常气动力。在风洞中对车桥系统节段模型进行了测力试验,同时也进行了CFD数值计算,获得了考虑桥梁影响的列车和桥梁的三分力系数。4)采用测压法测量了车桥系统列车断面表面的脉动压力,获得了列车断面的平均压力分布和脉动压力分布特征。计算出了列车断面的气动力,对列车断面气动力的跨向相关性进行了探讨。5)采用等效气动导数法对车桥系统列车断面的气动导纳进行了识别,分析了气动导纳的影响因素,对列车断面的气动导纳进行了曲线拟合,提出了列车抖振力气动导纳的经验公式。
[Abstract]:With the development of high-speed railway in China, the speed of train running is getting faster and faster, and the span of railway bridge is becoming larger and larger. Under the action of natural wind, the dynamic effect of vehicle-bridge system will be more and more obvious. In order to improve the safety of the train passing through the bridge, it is necessary to do more detailed research on the bridge system. Buffeting is a kind of limiting vibration caused by the pulsating component of natural wind. When the train passes through the bridge at high speed, the excessive vibration will not bring fatal danger, but it will also make the passenger's comfort greatly reduced. Based on this, some key parameters of buffeting force of vehicle-bridge system are studied experimentally. In this paper, using the method of theoretical analysis and wind tunnel test, taking a large span railway truss bridge as the background, the three-point force coefficient of the train in the vehicle-bridge system is measured, and the cross-direction correlation of the cross-section aerodynamic force of the train under the action of turbulent wind is studied. The aerodynamic admittance of train is identified and the empirical formula of train pneumatic admittance is put forward. The main contents of this paper are as follows: 1) the wind-induced vibration of the bridge is introduced, the research status of aerodynamic admittance is reviewed and the research content of train aerodynamic force is explained. 2) the turbulent characteristics of the atmospheric boundary layer are described. In the wind tunnel, two kinds of turbulent flow fields are simulated, and the turbulent characteristics of the simulated turbulence field are analyzed. 3) the flow around the train is explained, and the steady and unsteady aerodynamic forces acting on the train in the vehicle-bridge system are analyzed. In the wind tunnel, the model of the vehicle-bridge system is tested by force measurement, and the CFD numerical calculation is also carried out. The three-point force coefficients of the train and the bridge considering the influence of the bridge are obtained. 4) the fluctuating pressure on the surface of the train section of the vehicle-bridge system is measured by using the pressure measurement method, and the average pressure distribution and the fluctuating pressure distribution characteristics of the train section are obtained. The aerodynamic force of the train section is calculated, and the cross-direction correlation of the aerodynamic force of the train section is discussed. 5) the aerodynamic admittance of the train section of the vehicle-bridge system is identified by using the equivalent aerodynamic derivative method, and the influencing factors of the aerodynamic mobility are analyzed. The aerodynamic admittance of train section is fitted by curve, and the empirical formula of aerodynamic admittance of train buffeting force is proposed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3
本文编号：2382666
[Abstract]:With the development of high-speed railway in China, the speed of train running is getting faster and faster, and the span of railway bridge is becoming larger and larger. Under the action of natural wind, the dynamic effect of vehicle-bridge system will be more and more obvious. In order to improve the safety of the train passing through the bridge, it is necessary to do more detailed research on the bridge system. Buffeting is a kind of limiting vibration caused by the pulsating component of natural wind. When the train passes through the bridge at high speed, the excessive vibration will not bring fatal danger, but it will also make the passenger's comfort greatly reduced. Based on this, some key parameters of buffeting force of vehicle-bridge system are studied experimentally. In this paper, using the method of theoretical analysis and wind tunnel test, taking a large span railway truss bridge as the background, the three-point force coefficient of the train in the vehicle-bridge system is measured, and the cross-direction correlation of the cross-section aerodynamic force of the train under the action of turbulent wind is studied. The aerodynamic admittance of train is identified and the empirical formula of train pneumatic admittance is put forward. The main contents of this paper are as follows: 1) the wind-induced vibration of the bridge is introduced, the research status of aerodynamic admittance is reviewed and the research content of train aerodynamic force is explained. 2) the turbulent characteristics of the atmospheric boundary layer are described. In the wind tunnel, two kinds of turbulent flow fields are simulated, and the turbulent characteristics of the simulated turbulence field are analyzed. 3) the flow around the train is explained, and the steady and unsteady aerodynamic forces acting on the train in the vehicle-bridge system are analyzed. In the wind tunnel, the model of the vehicle-bridge system is tested by force measurement, and the CFD numerical calculation is also carried out. The three-point force coefficients of the train and the bridge considering the influence of the bridge are obtained. 4) the fluctuating pressure on the surface of the train section of the vehicle-bridge system is measured by using the pressure measurement method, and the average pressure distribution and the fluctuating pressure distribution characteristics of the train section are obtained. The aerodynamic force of the train section is calculated, and the cross-direction correlation of the aerodynamic force of the train section is discussed. 5) the aerodynamic admittance of the train section of the vehicle-bridge system is identified by using the equivalent aerodynamic derivative method, and the influencing factors of the aerodynamic mobility are analyzed. The aerodynamic admittance of train section is fitted by curve, and the empirical formula of aerodynamic admittance of train buffeting force is proposed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3
【参考文献】
相关博士学位论文 前2条
1 李永乐;风—车—桥系统非线性空间耦合振动研究[D];西南交通大学;2003年
2 韩艳;桥梁结构复气动导纳函数与抖振精细化研究[D];湖南大学;2008年
，本文编号：2382666
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