采用双块式无砟轨道时高速铁路高架桥梁结构噪声产生机理分析

发布时间：2018-03-28 20:47

本文选题：高速铁路　切入点：高架桥　出处：《兰州交通大学》2014年硕士论文

【摘要】：高速列车运行时轮轨系统相互耦合作用使高架桥梁产生振动，这一振动通过高架桥梁及地面向线路四周进行传递，同时激起包括周围建筑物在内的一系列结构的振动与二次噪声，这些结构振动与二次噪声严重影响了人们的正常生活和建筑结构的安全。高架桥梁结构二次噪声正是由于轮轨耦合振动引起的，而目前对高架桥梁结构振动与二次噪声的产生机理与高架结构的减振降噪的方法研究工作并不多，所以对高速铁路高架桥梁结构振动噪声产生机理的研究显得非常重要。本文基于铁路大系统动力学理念，将车辆—轨道—高架桥梁相互耦合动力学理论与声学边界元相结合，以双块式无砟轨道高架箱型桥梁为研究对象，借助数值仿真技术手段对其进行结构振动响应分析及线路周围声场辐射噪声的研究。通过多体动力学软件SIMPACK建立高速列车仿真模型和赋予其结构参数，以德国低干扰轨道谱做为车辆—轨道耦合系统的激扰计算轮轨垂向力；利用大型有限元分析软件ANSYS建立双块式无砟轨道高架箱型桥梁结构模型对其进行自振分析，并把轮轨力作为载荷条件输入到桥梁有限元模型中进行瞬态分析，获得其结构动力响应结果。通过ANSYS软件与声学软件LMS.Virtual.LAB软件之间的接口，将双块式无砟轨道高架箱型桥梁结构模型导入LMS.Virtual.LAB中，建立声场边界元模型和场点网格，，并把瞬态分析结果作为激励边界条件输入到声学模块中进行声学分析，获得各个场点的振动辐射噪声评价指标特性及声场分布。利用上述方法建立的仿真模型计算了不同列车速度和钢轨扣件参数对双块式无砟轨道高架箱型桥梁振动噪声的影响，从而更准确描述双块式无砟轨道高速铁路高架桥梁结构振动噪声产生的机理，为以后的高速铁路高架桥梁结构振动噪声的减振降噪提供可靠的理论依据。
[Abstract]:The vibration of the elevated bridge is caused by the coupling of the wheel-rail system when the high-speed train is running. The vibration is transmitted through the viaduct and around the ground facing the line. At the same time arousing vibration and secondary noise of a series of structures, including surrounding buildings, These structural vibration and secondary noise seriously affect the normal life of people and the safety of the building structure. The secondary noise of elevated bridge structure is caused by the wheel-rail coupling vibration. At present, there is not much research on the mechanism of vibration and secondary noise of elevated bridge structure and the method of reducing vibration and noise of elevated bridge structure, so it is very important to study the mechanism of vibration and noise generation of elevated bridge structure of high-speed railway. Based on the concept of large-scale railway system dynamics, this paper combines the theory of vehicle-track viaduct coupling dynamics with acoustic boundary element, and takes the double-block ballastless track elevated box bridge as the research object. By means of numerical simulation, the vibration response of the structure and the radiated noise of the sound field around the line are studied. The simulation model of high-speed train is established and its structural parameters are given by the multi-body dynamics software SIMPACK. The wheel / rail vertical force is calculated by using the low interference track spectrum of Germany as the excitation of the vehicle-track coupling system. The self-vibration analysis of the double-block ballastless track elevated box bridge structure is carried out by using the large-scale finite element analysis software ANSYS, and the wheel-rail force is input into the bridge finite element model as the load condition for transient analysis. Through the interface between the ANSYS software and the acoustic software LMS.Virtual.LAB, the two-block ballastless track box bridge model is introduced into LMS.Virtual.LAB, and the sound field boundary element model and the field point grid are established. The transient analysis result is input into the acoustic module as the excitation boundary condition, and the evaluation index characteristics and the sound field distribution of the vibration radiation noise at each field point are obtained. The effects of different train speed and rail fastener parameters on vibration and noise of double-block ballastless track elevated box bridge are calculated by using the simulation model established by the above method. Thus, the mechanism of vibration and noise generation of high speed railway bridge structure with double block ballastless track is described more accurately, which provides a reliable theoretical basis for the vibration and noise reduction of high speed railway elevated bridge structure in the future.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3;U213.244

【参考文献】