平面五杆机构类型判别方法的研究

:1001-2354(2002)05-0021-03李辉,张策,孟宪举(,300072):提出并验证了平面二自由度五杆机构双曲柄存在的充要条件,提出平面五杆机构的类型不仅与五杆机构的杆长有关,而且还与机架和原动件的选取有关平面五杆机构若满足:Lmax+Lmin1+Lmin2a+b(其余两杆的长度和),且当一个短杆为输入连架杆,而另一个短杆为机架或另一输入连架杆时,则该五杆机构必存在双曲柄:五杆机构;机构设计;曲柄:TH122:A,,,,,,[1~4],,Grashof,,RRRRP1平面5R五杆机构存在曲柄的杆长条件及其分类1L1L4,L5,L1L4,L2L3180!BCD,,L1L4,,L1L4,L2L3(0180),14min0max180,ABCDE[5]1,BD:Bx=L1cos1,By=L1sin1Dx=L5+L4cos4,Dy=L4sin4yBD,:y2=(Bx-Dx)2+(By-Dy)2=L21+L24+L25+2L4L5cos4-2L1L5cos1-2L1L4cos(1-4)(1)1(1):y2,maxmin,y2:y21=0y24=0(2)!=2y2212y224-2y21420(3)[3]SuYin,JonathanCagan.Anextendedpatternsearchalgorithmforthree-dimensionalcomponentlayout[J].TransactionofASME,2000,102:102-108.[4]Szolfghari,MLiang.Machinecell/partfamilyformationconsideringprocessingtimesandmachinecapacities:Asimulatedannealingapproach[J].ComputerandEngng,1998,34:813-823.[5].CATLS[J].,1995,21(6):3-9.[6],,CAD[M].,1996.[7]StefanJakobs.Theoryandmethodologyongeneticalgorithmsforthepackingofpolygons[J].EuropeanJournalofOperationalResearch88.1996,88:165-181.21∀#20025∃5机构学与机械动力学:2001-06-13;:2001-10-29:(2000005630):(1968-),,,,:(1)14:y21=2L1L5sin1+2L1L4sin(1-4)(4)y24=-2L4L5sin4-2L1L4sin(1-4)(5)2y221=2L1L5cos1+2L1L4cos(1-4)(6)2y224=-2L4L5cos4+2L1L4cos(1-4)(7)2y214=-2L1L4cos(1-4)(8)(2)(4)(5):L1sin1-L4sin4=0(9)sin1(L5+L4cos4-L1cos1)=0(10):L5+L4cos4-L1cos1%0(9)(10):sin1=sin4=0,(1,4)=0180,1=180,4=0,max;min(1,4)=(0,180),(0,0),(180,180)3,:(1)1=180,4=0,2:BCD,;,:L2-L3L1+L4+L5L2+L3(11)(2)1=0,4=180,3,(3)~(8):!=4L1L4L5(L5-L1-L4)0:L5L1+L4,:L2-L3L5-L1-L4L2+L3(12)23(3)1=0,4=0,4,(3)~(8):!=4L1L4L5(L1-L4-L5)0:L1L4+L5,:L2-L3L1-L4-L5L2+L3(13)(4)1=180,4=180,5,(3)~(8):!=4L1L4L5(L4-L1-L5)0:L4L1+L5,:L2-L3L4-L1-L5L2+L3(14):L=max(L1,L4,L5)Lmin=(L1+L4+L5)-L(11):L+LminL2+L3(15)(12)~(14):L-Lmin&L2-L3(16)LL2L3Lmax,(15)(16):Lmax=L,:Lmax+LminL2+L3Lmax=L2,:Lmax+LminL+L3Lmax=L3,:Lmax+LminL+L2(17)(15)(16)(17)LL2L3Lmin,LL2L3Lmax,LmaxLmin1Lmin2ab,:Lmax&a,b&(Lmin1+Lmin2)(18)(17):Lmax+Lmin1+Lmin2a+b(19)(19)∋,(19)(,(19)452双曲柄存在的充要条件,,,,∋,,(6),Grashof,,,∋3,,:2.1∋(1)Lmin1(Lmin2),Lmin2(Lmin1),(1)(2)Lmin1Lmin2,(2)(3)Lmin1(Lmin2),Lmin2(Lmin1),22机构学与机械动力学∀#20025∃5(1)(2)(3),2.2((,:(1),;(2)3实例分析,Grashof:1:(L1)L2)L3)L4)L5)=(10)21)19)20)5)Lmin1=5,Lmin2=10(6)ABA,AB,BE,BCDE,BE|L1-L5|BEL1+L5,BE,DE,Grashof,DEBC,BCDE,,ABDE,BC62:(L1)L2)L3)L4)L5)=(5)20)22)13)21)(7)Lmin1=5Lmin2=13,AE,BEBCDE,DE,|L1-L5|BEL1+L5,BE,DE,Grashof,DE,BC,BCDE,,ABDE4平面RRRRP五杆机构的曲柄存在条件8RRRRP,1,L2L3(9),ABD:L2-L3&L1(20)89,23,1,RRRRP5结论,,5R,Grashof,5RGrashof,,RRRRP[1],,.[J].,1998,21(9):329-332.[2],,.[J].(),1996,(20):42-44.[3],,.[J].,2001,18(3):23-25.[4],.[J].,1998,19(1):84-87.[5],,.[J].,1999,33(7):865-869.23∀#20025∃5机构学与机械动力学2002-05-01StudyanddevelopmentofsoftwaresystemforschemesgenerativetechnigueofconceptualdesignofmechanicalproductsSONGHui-junetal(CIMInstitute,Xi∗anJiaotongUniversity,ShanxiXi∗an,710049,China)Abstract:Schemesgenerationofconceptualdesignisreguardedasthemostcrucialtechniqueinconceptualdesignofproducts,anditisthemostimportantfactorindeterminingthefinalqualityofproduct,competitiveabilityinmarketandenterprise∗sprofitsacquisition.Basedontheoryofaxiomaticdesign,thispaperdiscussedthekeytechniquesandstrategyofrealizationforschemegenerationofconceptualdesignofmechanicalproductsandintroducedthedevelopmentofcorrespondingsoftwaresystem.Keywords:Conceptualdesign,Axiomaticdesign,Schemesgeneration,SoftwaresystemFig5Tab0Ref5+JixieSheji,13232002-05-04Aresearchonintegratedmodeloflife-cycleorientedgreenproductJIANGJi-binetal(SchoolofMechanical&AutomobileEngineering,HefeiPolytechnicUniversity,AnhuiHefei,23009,China)Abstract:Theestablishmentofintegratedmodelofgreenproductisthepremisetothedevelopmentoflife-cycleorientedgreenproduct.Onthebasisofanalyzingtheinformationoflife-cycleofgreenproduct,thispaperputforwardamulti-viewintegratedmodelonthebasisofproduct∗sstructure.Bymeansofinfo-mappingfromfrontviewtoapplicationalview,theinformationrequirementofeachenabletoolinthelife-cyclecanbefulfilled,andthepropertiesofdifferenceandofrelevanceforapplicationalinformationaremaintainedatthesametime.Theconcretethinkingofimplementationisadvancedtotherealizationofthatmodelsystem.Keywords:Greenproduct,Integratedmodel,Productmodeling,IntegrateddevelopmentofproductFig3Tab0Ref10+JixieSheji,14592002-05-07CollaborativedesigningmethodofdistributedmodularizationXIEHong-chaoetal(StateKeyLaboratoryofTribology,DepartmentofPrecisionInstrument&Mechanology,TsinghuaUniversity,Beijing,100084,China)Abstract:Thispaperputforwardanopenanddistributedcollaborativemechanicalpropertydesignenvironment(DCMDE).Thesystemadoptedadistributedmoduletechniquetocarryingoutmodelconstructionofthedesigningissues.Eachmodulerepresentsonedesigningsub-issueoronesubject∗saspectofanissue.EverymoduleusesamethodofobjectorientedtechniquetoencasethedataandprovidesservicesforusersandothermodulesthroughWebinterface.Everydesignmodulecouldsharethedataofproduct∗sinformationmodelwithinDCMDEandcommunicationandexchangeofdesigninginformationcanbecarriedoutbymeansofmodelofproductinformation,thusensuredtheconsistencyofproduct∗sdataincollaborativedesign.