基于MATLAB的汽车道路模型研究论文

武汉工业学院毕业设计（论文）2011届毕业设计(论文)题目：基于MATLAB的汽车道路模型研究院（系）机械工程学院专业名称机械设计制造及其自动化学生姓名瞿先明学生学号070301133指导教师胡志刚侯传亮2011年6月9日I摘要汽车虚拟样机技术，是计算机技术应用到机械行业中来以后产生的一种新的汽车振动性能实验方法。但虚拟样机技术实验的结果，强烈地依赖于所建立的仿真模型的真实程度。目前大多数汽车振动分析的激振信号，采用随机信号或变频正弦激励信号，虽然激振频带能包含汽车固有频率，但激振信号并不能代替实际路面振动情况。行驶平顺性是汽车的重要性能之一，它不仅影响了乘客的乘坐舒适性，而且也是防止司机疲劳，避免造成车祸的重要因素，因此行驶平顺性曰益受到人们的重视。但是传统的研究分析方法已无法满足现代汽车的研究要求，虚拟样机技术作为一项新的技术，已经开始用到各个领域。本文比较详细的介绍了行驶平顺性的概念、评价指标和评价方法以及目前该领域的研究现状。介绍了MATLAB/SIMULINK软件的主要模块和软件的理论基础，为后面的建模和仿真分析奠定了基础。并在MATLAB平台下，利用滤波白噪声生成法重构时域路面不平度仿真模型，并考虑行驶速度对汽车振动的影响。关键词：随机路面MATLABADAMS道路模型IIAbstractThevirtualprototypetechnologyisacomputertechnologythatappliedtomechanicalindustry,Whichafteranewcarsproducedvibrationperformancetestmethods.Buttheresultsofthevirtualprototypetechnologyexperiment,intraoperativedependentstronglyonthesimulationmodel,thatisestablishedbythetrueextent.Mostcurrentautovibrationanalysisvibrationsignal,usingrandomsignalsorfrequencyconversion.Althoughtheexcitationfrequencybandcanincludetheautomobileinherentfrequency,butexcitationletterNumbercannotreplacerealpavementvibrationcircumstances.Thetidingcomfortisoneofthemostimportantperformancesofvehicle．Itcallinfluencenotonlythefeelingofpassengers，butalsothepreventionofcrashbyavoidingmakingthedrivertired.Soitispaidmoreandmoreemphasisgradually．Thetraditionalresearchmethodcan’tnotmatchthemodernrequirementofvehicle’sresearchanddevelopment．SoVirtualPrototypingTechnologyhasbeenappliedinmanyfieldsasanewindustrialtechnology．Thisdissertationintroducestheconcept,evaluatingindicator,evaluationmethodandthepresentstatusofvehicletidingcomfortindetail.ThenthekeymodulesandthetheoreticalbasisofMATLABareintroduced,whichwillbeusedinthefollowingchapters．Thesetheoriesarethebaseofsubsequentmodelbuildingandsimulationanalysis．InMATLABflat,weusefilteringWhitenoisegeneratingmethod,thatcanreconstructroadroughnesssimulationmodeloftimedomain,andconsidertheroadSpeedontheinfluenceofautovibration.Keywords:randomroadMATLABADAMSroadmodeIII目录摘要.........................................................................................................................IABSTRACT............................................................................................................II1绪论....................................................................................................................11.1引言...............................................................................................................11.2汽车行驶平顺性研究的意义...........................................................................21.3汽车行驶平顺性研究的发展概况....................................................................21.4汽车平顺性改进及仿真的研究概况................................................................41.5本文研究的主要内容......................................................................................42MATLAB/SIMULINK的软件理论基础.................................................................62.1MATLAB软件简介.........................................................................................62.1.1MATLAB软件特点...................................................................................62.1.2MATLAB软件优势...................................................................................62.1.3用户界面设计..........................................................................................82.2SIMULINK软件简介......................................................................................82.2.1SIMULINK功能.......................................................................................92.2.2SIMULINK软件特点................................................................................92.3MATLAB／SIMULINK系统仿真...................................................................102.4车辆道路组件模型库系统功能结构...............................................................112.4.1组件模型库子系统..................................................................................112.4.2组件模型库开发与管理..........................................................................122.4.3模型研究子系统....................................................................................122.5组件模型库系统层次结构和组成..................................................................122.5.1层次结构体系........................................................................................122.5.2模型库的组成........................................................................................122.6本章小结.....................................................................................................133路面不平度.......................................................................................................143.1路面不平度概述...........................................................................................143.2路面不平度的表达方法................................................................................143.3路面不平度表达式及分级参数.....................................................................153.4时间频率功率谱描述....................................................................................163.5路面随机不平度时域模型的建立..........................................