f载重车模态分析毕业论文

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1、F21载重车模态分析毕业论文摘要随着国民经济持续多年的高速发展，尤其是国家对基础设施建设投入的逐年加大，使得载重汽车的生产在今年来呈现了爆发式发展，而改善载重车平顺性的研究也越来越受到重视。平顺性是影响乘员舒适性和运输货物完好最重要的因素，波及到载重车的动力性和经济性。本文针对一款国产F21型平衡悬架三轴载重车，主要通过ANSYS软件对载重车进行模态分析计算来研究其平顺性。对该车进行了简化，根据振动力学多自由度系统的理论分析，通过软件建立F21型载重车的多自由度系统的振动模型，在频率域内对模型了进行了模态分析的求解，

2、得到5阶固有频率和5阶振型图，对各阶振型图进了对比分析，为以后改善平顺性的研究打下了基础。关键词：平顺性；模态分析；多自由度；固有频率；振型；Title：Abstract:Withforseveralyearstherapiddevelopmentofnationaleconomy,especiallythestateofinfrastructurespendingincreasedyearbyyear,makethetruckproductionintheyeartorendertheexplosivedevelo

3、pment,andimprovethetruckcomfortresearchisbecomingmoreandmoreattention.Comfortisaffectedoccupantcomfortandtransportthegoodsingoodcondition,themostimportantfactorsaffectedtothetruckperformanceandfueleconomy.InthispaperamodelofF21balancesuspensionthree-axistruck,m

4、ainlythroughtheANSYSsoftwarewascarriedoutonthetruckmodalanalysisandcalculationtostudyitscomfort.Tosimplifythevehicle,accordingtothetheoryofvibrationmechanicsofmultidegreeoffreedomsystemanalysis,throughthesoftwarebuildF21typetruckvibrationmodeloffivedegreesoffre

5、edomsystem,thefrequencydomainmodelforthesolutionofthemodalanalysis,get5ordernaturalfrequencyandmodeshapesmodelfigure,foreachorderintothemodalanalysis,laidthefoundationforlaterworktoimprovetheridecomfort.Keywords:Comfort;Themodalanalysis;Manydegreesoffreedom;Nat

6、uralfrequency;Vibrationmode;目录1绪论.............................................................11.1课题研究背景...................................................11.2国内外研究现状.................................................21.2.1研究方法的分类.................................

7、............21.2.2汽车动力模型研究...........................................41.2.3平顺性评价方法和指标的优化.................................51.3本课题研究的目的和意义.........................................51.4本文的研究内容.................................................62模态分析理论及ANSYS软件介绍......

8、...............................72.1振动力学分析...................................................72.1.1多自由度系统无阻尼振动.....................................72.1.2多自由度系统有阻尼振动..........