本文選題：車架 + 有限元分析��； 參考：《重慶大學》2016年碩士論文

【摘要】：車架作為整車中的核心部分,承受和傳遞著道路和裝載的各種復雜載荷,并且汽車上許多重要總成都是以車架為載體,其性能的好壞直接關系到整車性能的好壞。車架破壞的形式有強度破壞和耐久性破壞。本文以某商用車車架結(jié)構(gòu)作為主要研究對象,結(jié)合工程理論和實際,從靜態(tài)特性和疲勞特性兩個方面對商用車車架的可靠性及耐久性進行了評估,并完成了對車架結(jié)構(gòu)零部件的疲勞壽命改進設計,為企業(yè)實際生產(chǎn)提供參考依據(jù)和數(shù)據(jù)積累。本文的主要研究內(nèi)容及成果如下:(1)采用HyperMesh有限元軟件建立了商用車車架結(jié)構(gòu)計算模型,分別對車架結(jié)構(gòu)彎曲、扭轉(zhuǎn)兩種典型工況的車架靜態(tài)強度、剛度進行了計算和分析,預測車架結(jié)構(gòu)應力及變形情況,仿真結(jié)果表明車架結(jié)構(gòu)強度、剛度滿足設計要求;(2)開展了對車架結(jié)構(gòu)的臺架試驗,車架的彎曲剛度為86.47KN/mm;三種車架形式的扭轉(zhuǎn)剛度差別甚微,均在5000N*m/°左右。同時與有限元仿真模型的強度、剛度結(jié)果進行對比,驗證了有限元分析模型的正確性和計算結(jié)果的可靠性,并討論分析了試驗與仿真偏差的原因;(3)開展了車架扭轉(zhuǎn)疲勞臺架試驗,并根據(jù)試驗進行了疲勞壽命預測仿真分析,對比分析驗證了疲勞壽命分析的可靠性,并對臺架試驗中斷裂的零部件進行改進設計,改進后的橫梁連接板在50萬次循環(huán)后累積損傷為原始結(jié)構(gòu)的1/3,平衡軸貫通梁改進后的累積損傷為原始的1/11。
[Abstract]:As the core part of the whole vehicle, the frame bears and conveys various complex loads on the road and loads, and many important assemblies on the vehicle take the frame as the carrier, and its performance is directly related to the performance of the whole vehicle. The form of frame failure is strength failure and durability damage. In this paper, the reliability and durability of a commercial vehicle frame are evaluated from two aspects: static characteristics and fatigue characteristics, taking the frame structure of a commercial vehicle as the main research object, combining with engineering theory and practice, and evaluating the reliability and durability of the frame from two aspects: static characteristics and fatigue characteristics. The improved design of fatigue life of frame structural parts is completed, which provides reference basis and data accumulation for actual production. The main contents and results of this paper are as follows: (1) the calculation model of commercial vehicle frame structure is established by using HyperMesh finite element software. The static strength and stiffness of frame structure under two typical working conditions, bending and torsion, are calculated and analyzed respectively. The simulation results show that the strength and stiffness of the frame structure meet the design requirements. The bench test of the frame structure is carried out. The bending stiffness of the frame is 86.47 KN / mm, and the torsional stiffness of the three kinds of frame forms has little difference. All of them were about 5000N*m/ 擄. At the same time, compared with the results of strength and stiffness of the finite element simulation model, the correctness of the finite element analysis model and the reliability of the calculation results are verified. The reason of the deviation between test and simulation is discussed and analyzed. (3) the torsional fatigue bench test of frame is carried out, and the simulation analysis of fatigue life prediction is carried out according to the test. The reliability of fatigue life analysis is verified by contrast analysis. After 500000 cycles, the cumulative damage of the improved cross beam connection plate is 1 / 3 of the original structure, and the accumulated damage of the improved balance shaft through beam is 1 / 11 of the original one.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U463.32

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本文編號：1814525