结构力学中关于曲杆结构位移计算方法的探讨

90201638¤;1)y¤(221008)y(230051)..(hRC=5).,,O342Adoi10.6052/1000-0879-14-402¢=XZMd#+XZFsd´+XZFNd¸¡XFRc(1)d#,d´,d¸dsM,Fs,FN,FRc.ds()M,Fs,FNt0¢t.(1)ds[1]d#=³MEI+®¢th´dsd´=kFsGAdsd¸=³FNEA+®t0´ds9=;(2)(2)(1)¢=XZMMEIds+XZkFsFsGAds+XZFNFNEAds+XZM®¢thds+XZFN®t0ds¡XFRc(3)EI;GA;EAk®,h.(3)[2].ds(2)()d#,d´,d¸.(3).d#,d¸dsMFN.M,Fs,FN()(2)(3)..1(b£h)Rcdsd'.2014{12{1112015{02{09.1)E-mail:[e-mail],..,2016,38(1):90-92LuCaifeng,LuFengdi.Discussiononcalculationmethodaboutthedisplacementofcurvedbarsstructureinstructuralmechanics.MechanicsinEngineering,2016,38(1):90-921911(a)dsM.rMdsdµM[1]d#M=MERcSds(4)Rc;S=AyAyy=Rc¡h=ln(R1=R2)R1;R2.(4)MMds=EI.1dsMMd¸M()(4)d¸M=ydµM=yMERcAyds=MEARcds(5)1(b)dsFNFNd¸N=FNEAds(6)FNdµN(6)dµN=d¸NRc=FNEARcds(7)1(c)ds.t0d¸t=®t0ds(8)¢t(8)dµt=®¢thds+®t0Rcds(9)Fsds[3]d´=kFsGAds(10)dsM,Fs,FNd#=d#M+d#N+d#t=MERcSds+FNEARcds+®¢thds+®t0Rcdsd¸=d¸N+d¸M+d¸t=FNEAds+MEARcds+®t0dsd´=kFsGAds9=;(11)(11)(1)¢=XZMMERcSds+XZMFNEARcds+XZkFsFsGAds+XZFNFNEAds+XZFNMEARcds+XZMî¢th+®t0Rc!ds+XZFN(®t0ds)¡XFRc(12)92201638(12)(3)1EIERcS2d#N5d¸M6®¢tds=h(®¢t=h+®t0=Rc)ds.(12)Rc!1ERcS!EI(12)(3).22(a)ABRqt1,t2(t2t1)B¢B.2¢BB2(b).BCµM=¡0:5qR2sin2µ,Fs=qRsinµcosµ,FN=¡qRsin2µM=¡Rsinµ,Fs=cosµ,FN=¡sinµ¢M;¢S;¢N;¢tM,Fs,FN(3)t0=(t1+t2)=2,¢t=t2¡t1¢M=XZBAMMEIds=qR43EI¢s=XZkFsFsGAds=kqR23GA¢N=XZFNFNEAds=2qR23EA¢t=XZM®¢thds+XZFN®t0ds=®¢tR2h¡®t0R9=;(13)(12)¢0M=¢0M1+¢0M2=XMMERcSds+XMFNEARcds¢0N=¢0N1+¢0N2=XFNFNEAds+XFNMEARcds¢0s=¢s¢0t=XZMµ®¢th+®t0Rc¶ds+XZFN®t0ds9=;(14)h=Rc1(¢M¢M=1).E=G=8=3k=1:2[2].1¢M¢s¢N¢0M1¢0M2¢0s=¢s¢0N1=¢N¢0N2h=Rc14/151/60.9281/64/151/61/12h=Rc=211/151/240.9831/241/151/241/48h=Rc=514/3751/1500.9971/1504/3751/1501/300h=Rc=1011/3751/6000.9991/6001/3751/6001/1200h=Rc=1511/8441/135011/13501/8441/13501/2700(13)(14)1(1)(14)¢0M2¢0M1h=Rc.h=Rc¢0M2=¢0M1=18%;h=Rc=5¢0M2=¢0M1=0:6%.dsdµN(7).(2)(14)¢0N2¢0N1h=Rc¢0N2=¢0N1=50%.dsd¸M.(26)26201638((360/n)±n)360±.360±.CSAR.(1).CSARz[9].(2)SAR[10]..(3).1CurlanderJC,McDonoughRN.SyntheticApertureRader:SystemandSignalProcessing.NewYork:Wiley,19912FranceschettiG,LanariR.SyntheticApertureRaderSig-nalProcessing.BocaRaton:CRCPress,19993IshimaruA,ChanTK,KugaY.Animagingtechniqueusingconfocalcircularsyntheticapertureradar.IEEETransactionsonGeoscienceandRemoteSensing,1998,36(5):1524-15304ChanTK,KugaY,IshimaruA.ExperimentalstudiesoncircularSARimaginginclutterusingangularcorrelationfunctiontechnique.IEEETransactionsonGeoscienceandRemoteSensing,1999,37(5):2192-21975JinMY,ChenM.Analysisandsimulationforaspotlight-modeaircraftSARincircular°ightpath.GeoscienceandRemoteSensingSymposium,IGARSS'93,19936ZhangXK,ZhangYH,JiangJS.CircularSARimagingapproximatedbyspotlightprocessing.ISAPE2006,Guilin,20067,,..20018..[].:,20079SoumekhM.ReconnaissancewithslantplanecircularSARimaging.IEEETransactionsonImageProcessing,1996,5(8):1252-126510LiJ,BiZ,LiuZS,etal.UseofcurvilinearSARforthree-dimensionaltargetfeatureextraction.IEEProceedingsofRadar,SonarandNavigation,1997,144(5):275-283(:)(92)(3)h=Rc(¢M)(¢0M)(¢N)(¢0N).h=Rc,h=Rc=29.8%,2.4%33.3%.(4)Rc=nh(¢0t¡¢t)=¢0t=t0=(n¢t).(12)(hRc=5).3....1..:,20102,,.I|(3).:,20123,,.(2).:,2008(:)