本文選題：白車身 + 有限元模型��； 參考：《湖南大學(xué)》2016年碩士論文

【摘要】：隨著科學(xué)技術(shù)的進(jìn)步和人們節(jié)能環(huán)保意識(shí)的提高,汽車正朝著安全、舒適、節(jié)能、環(huán)保等方向發(fā)展。對(duì)汽車本身結(jié)構(gòu)的最優(yōu)化設(shè)計(jì)是提高汽車性能、實(shí)現(xiàn)節(jié)能減排的有效措施。汽車接頭作為車身結(jié)構(gòu)的關(guān)鍵過(guò)渡區(qū)域和主要傳力部件,其結(jié)構(gòu)直接決定了車身的扭轉(zhuǎn)剛度、彎曲剛度和振動(dòng)模態(tài)等性能。對(duì)汽車接頭進(jìn)行詳細(xì)的研究,有利于提高車身質(zhì)量,為設(shè)計(jì)人員提供參考依據(jù),具有重要的理論價(jià)值和實(shí)際意義。針對(duì)目前對(duì)于汽車接頭的研究多數(shù)放在車身主要接頭上,關(guān)于橫梁接頭的研究較少這一實(shí)際情況,本文深入探究了橫梁接頭形式對(duì)車身剛度性能的影響。主要研究結(jié)果如下：(1)建立了基于HyperWorks的商用車白車身有限元模型,對(duì)該模型進(jìn)行了彎曲剛度和扭轉(zhuǎn)剛度分析,得到了車身變形情況以及剛度值。相應(yīng)地,對(duì)實(shí)際樣車進(jìn)行了剛度試驗(yàn),對(duì)比分析仿真結(jié)果與試驗(yàn)結(jié)果,驗(yàn)證了有限元模型的合理性與可靠性。(2)基于靈敏度分析理論,以車身總質(zhì)量為目標(biāo)函數(shù),車身扭轉(zhuǎn)剛度、彎曲剛度為約束條件,進(jìn)行了車身性能對(duì)板厚的靈敏度分析,并獲得了關(guān)重模塊如覆蓋件、縱梁、橫梁、B柱等對(duì)白車身彎扭剛度的貢獻(xiàn)比。發(fā)現(xiàn)橫梁模塊對(duì)扭轉(zhuǎn)剛度的貢獻(xiàn)明顯偏低,僅為0.79%。(3)研究了不同橫梁接頭形式對(duì)車身剛度性能的影響,對(duì)接頭進(jìn)行了優(yōu)化設(shè)計(jì)。結(jié)果表明采用分段式接頭時(shí)白車身剛度性能最好,接頭優(yōu)化后橫梁模塊的扭轉(zhuǎn)剛度貢獻(xiàn)比得到了明顯的提升,達(dá)到4.68%。通過(guò)對(duì)某相近車型進(jìn)行優(yōu)化設(shè)計(jì),表明了改進(jìn)橫梁接頭形式是提升車身剛度和實(shí)現(xiàn)輕量化的有效途徑。
[Abstract]:With the progress of science and technology and the improvement of people's awareness of energy saving and environmental protection, cars are developing towards safety, comfort, energy saving and environmental protection.The optimization design of automobile structure is an effective measure to improve the performance of automobile and realize energy saving and emission reduction.As the key transition region and the main force transfer component of the body structure, the structure of the joint directly determines the torsional stiffness, bending stiffness and vibration mode of the body.The detailed research on automobile joint is beneficial to improve the body quality and provide reference for designers. It has important theoretical value and practical significance.In view of the fact that most of the researches on automobile joints are on the main body joints and there is less research on the cross beam joints, the effect of the cross beam joints on the stiffness performance of the body is deeply investigated in this paper.The main results are as follows: (1) the finite element model of commercial vehicle white body based on HyperWorks is established. The bending stiffness and torsional stiffness of the model are analyzed and the deformation and stiffness of the body are obtained.Accordingly, the stiffness test of the actual prototype vehicle is carried out. By comparing the simulation results with the test results, the rationality and reliability of the finite element model are verified. Based on the sensitivity analysis theory, the torsional stiffness of the vehicle body is determined by taking the total mass of the body as the objective function.The bending stiffness is taken as the constraint condition, and the sensitivity analysis of the body performance to the plate thickness is carried out, and the contribution ratio of the closing weight modules such as the panel, the longitudinal beam and the B column to the bending and torsional stiffness of the body is obtained.It is found that the contribution of beam module to torsional stiffness is obviously low, which is only 0.79. 3) the influence of different beam joint forms on the stiffness performance of the body is studied, and the optimization design of the joint is carried out.The results show that the stiffness performance of the BIW is the best when the segmented joints are adopted, and the contribution ratio of torsional stiffness of the beam module after the optimization of the joints is obviously increased to 4.68%.By optimizing the design of a similar type of vehicle, it is shown that improving the form of cross beam joint is an effective way to enhance the body stiffness and achieve lightweight.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U463.82
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本文編號(hào)：1734539