![Engineering Basic Mechanics I Statics 工程基础力学Ⅰ 静力学 课件 Chapter 4 Space Force System_第1页](http://file4.renrendoc.com/view5/M00/07/25/wKhkGGaELqmAaQSVAABZ7X-g_6M540.jpg)
![Engineering Basic Mechanics I Statics 工程基础力学Ⅰ 静力学 课件 Chapter 4 Space Force System_第2页](http://file4.renrendoc.com/view5/M00/07/25/wKhkGGaELqmAaQSVAABZ7X-g_6M5402.jpg)
![Engineering Basic Mechanics I Statics 工程基础力学Ⅰ 静力学 课件 Chapter 4 Space Force System_第3页](http://file4.renrendoc.com/view5/M00/07/25/wKhkGGaELqmAaQSVAABZ7X-g_6M5403.jpg)
![Engineering Basic Mechanics I Statics 工程基础力学Ⅰ 静力学 课件 Chapter 4 Space Force System_第4页](http://file4.renrendoc.com/view5/M00/07/25/wKhkGGaELqmAaQSVAABZ7X-g_6M5404.jpg)
![Engineering Basic Mechanics I Statics 工程基础力学Ⅰ 静力学 课件 Chapter 4 Space Force System_第5页](http://file4.renrendoc.com/view5/M00/07/25/wKhkGGaELqmAaQSVAABZ7X-g_6M5405.jpg)
版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
StaticsStaticsofrigidChapter4SpaceForceSystemMaincontents4.1Concurrentforcesysteminspace4.2Systemofcouplesinspace4.3Themomentofaforceaboutapointoranaxis4.4Reductionofaforcesysteminspace4.5Equilibriumequationsofgeneralforcesysteminspace1.Howtorepresentaforceinspace(1)directprojection(2)directprojectionAforcecanbedescribedas4.1Concurrentforcesysteminspace2.Thecompositionandequilibriumofaconcurrentforcesysteminspace(1)CompositionTheresultantforceofconcurrentforcesysteminspaceisequaltovectorsumofthecomponents.
4.1ConcurrentforcesysteminspaceThelawofprojectionoftheresultantforce:Theprojectionoftheresultantforceofaforcesysteminspaceontoanaxisisequaltothealgebraicsumoftheprojectionsofthecomponentforcesontothesameaxis.(2)EquilibriumTheanalyticalmethodforequilibriumequations:4.1ConcurrentforcesysteminspaceThenecessaryandsufficientconditionofequilibriumisthattheresultantforceiszero:1.Coupleinspace(1)Couplemomentvector(2)Coupleinspaceisafreevector4.2Systemofcouplesinspace(3)Thenecessaryandsufficientconditionoftheequivalenceoftwospacecouplesisthatthecouplemomentvectorsofthetwocouplesareequal.2.Compositionandequilibriumofasystemofcouplesinspace(1)CompositionTheresultantmomentofcoupleisthesumofthemomentsofthecomponentcouples.Theprojectionsare
4.2Systemofcouplesinspace(2)Equilibrium1.Themomentofaforceaboutapoint(1)Definition:aforce
acting
ontheApoint,themomentofaforceaboutOpointinspaceisisvector4.3Themomentofaforceaboutapointoranaxis(2)analysisformula4.3Themomentofaforceaboutapointoranaxis(1)Definition:themomentofaspaceforceaboutanaxisisascalar,whichisequaltothemomentoftheprojectionofthisforceonaplaneperpendiculartothisaxisabouttheintersectingpointofthisplaneandthisaxis.4.3Themomentofaforceaboutapointoranaxis2.Themomentofaforceaboutaaxis4.3Themomentofaforceaboutapointoranaxis(2)Analysisformula4.3Themomentofaforceaboutapointoranaxis3.TherelationshipbetweenthemomentoftheforceaboutapointandthemomentoftheforceaboutanaxisthroughthepointTheorem:theprojectionofthevectorofthemomentofaforceaboutapointonanaxisthroughthispointisequaltothemomentoftheforceabouttheaxis.
ThehandleABCEisintheplaneAxy,FactingontheD
pointlocatesinaplanenormaltoyaxis,and
theangleis
α.If
CD=b,rodBCparallelsto
xaxis,rod
CEparallelstoyaxis,thelenghtofABandBCare
l,respectively.DeterminethemomentofFaboutx,yandzaxis,respectively.4.3ThemomentofaforceaboutapointoranaxisExample4-1AsweknownTheprojectionofforce
F
alongeverycoordinateaxis:thecoordinateofpointD:thenSolution:
1.
Theoremoftranslationofaforce
4.4ReductionofaforcesysteminspaceAforceactingonarigidbodycanbemovedparalleltoanyspecifiedpointintherigidbody,butacouplemustbeaddedatthesametime,andthemomentvectorofthecoupleisequaltothemomentvectoroftheoriginalforceaboutthespecifiedpoint.PrinciplevectorPrinciplemoment4.4Reductionofaforcesysteminspace
2.
Reduction
Aspacegeneralforcesystemcanbereducedtoaforceandcouple.Theforceactsonthesimplifiedcenter,
theforcevectorisequaltotheprincipalvectoroftheforcesystem;
themomentvectorofthecoupleisequaltotheprincipalmomentoftheforcesystemaboutthesimplifiedcenter.4.4Reductionofaforcesysteminspace
3.
Analysisformulaofprinciplevectorandprinciplemoment
theforcesystemisinequilibrium.theforcesystemisequivalenttoacouple.4.4Reductionofaforcesysteminspace
4.
Discussionofreductionresults
theforcesystemisequivalenttoaresultantforce.theforcesystemcanbefurtherreduced.4.4ReductionofaforcesysteminspaceForcewrench4.4ReductionofaforcesysteminspaceThenecessaryandsufficientconditionsforequilibriumofaforcesysteminspaceareAnalysisformula4.5EquilibriumequationsofgeneralforcesysteminspaceThegravityGofthecaris8kN,acingontheEpoint,F1=10kN,actingontheCpoint.Determineconstraintsforcesfromthegroundactingonthewheelsofthecar.4.5Equilibriumequationsofgeneral
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- 七年级下册生物教案全册-北师大版
- 电子商务平台安全防护的教育与培训实践
- 目的地品牌的跨平台传播策略研究
- 生态农业与商业可持续发展的关系
- 专题一第2课五、《软件系统》教学设计 2023-2024学年青岛版(2018)初中信息技术七年级上册
- 古诗词诵读《锦瑟》教学设计 2024-2025学年统编版高中语文选择性必修中册
- 电动汽车驱动系统技术培训课程
- 初一班主任月工作总结
- Unit 1 Science and Scientists Using Language 教学设计-2024-2025学年高中英语人教版(2019)选择性必修第二册
- 人事月工作总结和下月计划
- 2024年保险公司柜员年终工作总结
- 2025年南瑞集团招聘笔试参考题库含答案解析
- 七年级上学期历史期末考试模拟卷02(原卷版)
- 桥梁建设施工组织设计方案
- 2024年思想道德与政治考试题库 (单选、多选)
- (新版)中国动态血压监测基层应用指南(2024年)
- 2025年上半年上饶市上饶县事业单位招考(139名)易考易错模拟试题(共500题)试卷后附参考答案
- 2024托盘行业市场趋势分析报告
- GB/T 44892-2024保险业车型识别编码规则
- 四新技术培训
- 人教版一年级数学2024版上册期末测评(提优卷一)(含答案)
评论
0/150
提交评论