轻轨列车诱发敞开式声屏障的动力响应分析

轻轨列车诱发敞开式声屏障的动力响应分析(任务书,开题报告,外文翻译,论文13000字)
摘要
声屏障作为控制噪声的一种最有效方法，在城市高架轨道交通上应用越来越普遍。但是，声屏障结构的破坏问题也逐渐暴露出来，例如螺栓脱落、亚克力板开裂等，危及列车行驶安全。其中高速铁路关于列车风荷载诱发的声屏障破坏研究早有报道，较少考虑车桥耦合振动，但对于城市轻轨交通，列车行驶速度较低，列车风荷载远不如高速铁路中显著，而轻轨列车与高架桥之间的耦合振动可能成为声屏障破坏的重要影响因素。为了研究声屏障结构的车桥耦合振动响应，本文通过数值模拟开展了城市高架桥敞开式声屏障结构的动力响应分析的研究工作，主要包括：
（1）结合实际工程利用 ANSYS 软件建立城市高架桥/声屏障结构的有限元模型；分析城市高架桥/声屏障结构的动力特性，并验证有效性。
（2）分别探讨声屏障结构形式、车速、桥跨等对城市轻轨交通声屏障的影响规律。
（3）计算声屏障结构的车桥耦合振动响应。
关键词：直线高架桥；敞开式声屏障；动力响应；车桥耦合作用；低速列车

Abstract
As one of the most effective methods to control noise, noise barrier is more and more widely used in urban elevated rail transit. However, the damage of the noise barrier structure is gradually exposed, such as bolt shedding, acrylic plate cracking and so on, which endangers the safety of train operation. Among them, the research on the damage of noise barrier induced by train wind load in high-speed railway has been reported for a long time, and the coupling vibration between train and bridge is seldom considered. However, for urban light rail traffic, train speed is low, and train wind load is far less significant than that in high-speed railway. The coupling vibration between light rail train and viaduct may be an important factor affecting the damage of noise barrier. In order to study the vehicle-bridge coupling vibration response of the noise barrier structure, the dynamic response analysis of the open noise barrier structure of the urban viaduct is carried out through numerical simulation in this paper, mainly including:
(1) The finite element model of urban viaduct/noise barrier structure is established by ANSYS software in combination with practical engineering. The dynamic characteristics of urban viaduct/noise barrier structure are analyzed and the validity is verified.
(2) The effects of structure, vehicle speed and bridge span of noise barrier on urban light rail traffic noise barrier are discussed respectively.
(3) The vehicle-bridge coupling vibration response of the noise barrier structure is calculated.
Key words: curved viaduct; semi-closed noise barrier; dynamic response; vehicle-bridge interaction; low speed train
 
目录
摘要    I
Abstract    II
第1章 绪论    4
1.1 研究背景与意义    4
1.2 国内外研究现状    4
1.2.1 桥梁和声屏障结构的自振特性    4
1.2.2 声屏障的动力响应分析    5
1.3 存在的问题    6
1.4 本文所做的工作及创新点    7
第2章 高架桥/声屏障结构系统的动力特性    8
2.1 声屏障结构的发展概况    8
2.1.1 声屏障工作原理    8
2.1.2 声屏障材料研究    9
2.1.3 声屏障的分类    10
2.2 高架桥/声屏障结构模型的建立    11
2.3  高架桥/声屏障结构模型的验证    13
2.4 本章小结    14
第3章 敞开式声屏障的车桥耦合振动响应    15
3.1 基本工况分析    15
3.2 列车速度的影响分析    19
3.3 桥梁跨度的影响分析    21
3.4 本章小结    23
第4章 结论与展望    25
4.1 结论    25
4.2 展望    26
参考文献    27
致谢    28