發(fā)布時(shí)間：2018-06-28 15:09

  本文選題：LS-DYNA + 路面不平整度��； 參考：《中南大學(xué)》2014年碩士論文

【摘要】：摘要：隨著現(xiàn)代化進(jìn)程的不斷深化,我國的交通事業(yè)飛速發(fā)展,車輛數(shù)量的增加和車輛速度的提高對道路與橋梁結(jié)構(gòu)的要求越來越高。相比鐵路橋梁,公路橋梁所承受的荷載更加復(fù)雜多變,大量變化的動(dòng)荷載作用給橋梁結(jié)構(gòu)的耐久性與使用安全帶來嚴(yán)重影響。因此,需要準(zhǔn)確分析橋梁結(jié)構(gòu)在各種動(dòng)載作用下的動(dòng)力響應(yīng)。本文將汽車與橋面的接觸按實(shí)際的面面接觸來處理,建立了更切合實(shí)際的車輛-橋梁耦合振動(dòng)模型,并對汽車-橋梁的耦合振動(dòng)響應(yīng)進(jìn)行了分析研究。主要工作和研究成果如下： 1.簡單介紹了車橋耦合振動(dòng)響應(yīng)的研究發(fā)展過程和現(xiàn)狀,再闡述了在利用LS-DYNA程序中需要注意的一些關(guān)鍵問題及處理技術(shù),包括對顯示積分的簡潔介紹、接觸算法、沙漏控制技術(shù)、負(fù)體積控制技術(shù)和如何控制縮短計(jì)算時(shí)間等。 2.比較詳細(xì)地闡述了基于面接觸的車-橋耦合振動(dòng)模型的建立與有效性的驗(yàn)證,包括單軸模型和二軸模型,在此基礎(chǔ)上,對實(shí)際兩軸四輪車輛進(jìn)行簡單的建模仿真分析,比較了不同軸長的兩軸車輛對車橋耦合系統(tǒng)的影響。 3.充分利用LS-DYNA程序的強(qiáng)大面面接觸處理功能,對影響路面不平順的幾種因素進(jìn)行了建模仿真分析,主要包括方波、三角波、正弦波以及隨機(jī)不平順功率譜等,比較了不同影響因素下橋梁的有關(guān)響應(yīng)。 4.以東風(fēng)EQ3166汽車作為模擬車型,運(yùn)用LS-DYNA程序建立了其三維精細(xì)有限元模型和基于實(shí)體單元的橋梁三維有限元模型,重點(diǎn)模擬了車輛的輪胎、懸架系統(tǒng)和輪子與橋面的接觸,使之盡可能接近實(shí)際,對于橋梁模型,其兩邊分別接有兩段道路,從而可以較好模擬車輛進(jìn)橋、在橋上和出橋的全過程。本文的研究成果對進(jìn)一步精細(xì)化研究車-橋耦合振動(dòng)具有一定的參考價(jià)值。圖75幅,表14個(gè),參考文獻(xiàn)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.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.3

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