基于面面接触的车辆—桥梁耦合振动响应研究

发布时间：2018-06-28 15:09

本文选题：LS-DYNA + 路面不平整度　；参考：《中南大学》2014年硕士论文

【摘要】：摘要：随着现代化进程的不断深化,我国的交通事业飞速发展,车辆数量的增加和车辆速度的提高对道路与桥梁结构的要求越来越高。相比铁路桥梁,公路桥梁所承受的荷载更加复杂多变,大量变化的动荷载作用给桥梁结构的耐久性与使用安全带来严重影响。因此,需要准确分析桥梁结构在各种动载作用下的动力响应。本文将汽车与桥面的接触按实际的面面接触来处理,建立了更切合实际的车辆-桥梁耦合振动模型,并对汽车-桥梁的耦合振动响应进行了分析研究。主要工作和研究成果如下： 1.简单介绍了车桥耦合振动响应的研究发展过程和现状,再阐述了在利用LS-DYNA程序中需要注意的一些关键问题及处理技术,包括对显示积分的简洁介绍、接触算法、沙漏控制技术、负体积控制技术和如何控制缩短计算时间等。 2.比较详细地阐述了基于面接触的车-桥耦合振动模型的建立与有效性的验证,包括单轴模型和二轴模型,在此基础上,对实际两轴四轮车辆进行简单的建模仿真分析,比较了不同轴长的两轴车辆对车桥耦合系统的影响。 3.充分利用LS-DYNA程序的强大面面接触处理功能,对影响路面不平顺的几种因素进行了建模仿真分析,主要包括方波、三角波、正弦波以及随机不平顺功率谱等,比较了不同影响因素下桥梁的有关响应。 4.以东风EQ3166汽车作为模拟车型,运用LS-DYNA程序建立了其三维精细有限元模型和基于实体单元的桥梁三维有限元模型,重点模拟了车辆的轮胎、悬架系统和轮子与桥面的接触,使之尽可能接近实际,对于桥梁模型,其两边分别接有两段道路,从而可以较好模拟车辆进桥、在桥上和出桥的全过程。本文的研究成果对进一步精细化研究车-桥耦合振动具有一定的参考价值。图75幅,表14个,参考文献73篇。
[Abstract]:Absrtact: with the deepening of the modernization process, the rapid development of China's transportation industry, the increase in the number of vehicles and the increase of vehicle speed on the road and bridge structure is becoming more and more demanding. Compared with railway bridges, the loads of highway bridges are more complex and changeable, and a large number of dynamic loads have a serious impact on the durability and safety of bridge structures. Therefore, it is necessary to accurately analyze the dynamic response of bridge structure under various dynamic loads. In this paper, the contact between vehicle and bridge deck is treated according to the actual surface contact, a more practical vehicle-bridge coupling vibration model is established, and the coupled vibration response of the vehicle-bridge is analyzed and studied. The main work and research results are as follows: 1. This paper briefly introduces the research and development process and present situation of vehicle-bridge coupling vibration response, and expounds some key problems and processing techniques in using LS-DYNA program, including brief introduction of display integral, contact algorithm, hourglass control technology, etc. Negative volume control technology and how to control to shorten the calculation time, etc. 2. The establishment and validation of the vehicle-bridge coupling vibration model based on surface contact are described in detail, including the single-axle model and the two-axle model. On this basis, the simple modeling and simulation analysis of the actual two-axle four-wheel vehicle is carried out. The effects of two axle vehicles with different axle lengths on the vehicle-bridge coupling system are compared. Making full use of the powerful surface contact processing function of LS-DYNA program, several factors affecting road surface irregularity are modeled and analyzed, including square wave, triangle wave, sine wave and random irregularity power spectrum, etc. The responses of the bridge under different influence factors are compared. 4. 4. Taking Dongfeng EQ3166 as the simulation vehicle, the 3D fine finite element model and the bridge 3D finite element model based on solid element are established by using LS-DYNA program. The vehicle tire, suspension system and the contact between wheels and bridge deck are simulated emphatically. For the bridge model, there are two sections of road on both sides of the model, which can simulate the whole process of vehicle entering, entering and leaving the bridge. The research results in this paper have certain reference value for further fine study of vehicle-bridge coupling vibration. There are 75 pictures, 14 tables and 73 references.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3

【参考文献】