旋转磁场测量系统中永磁短节设计的基础的研究.pdf

!"#$10406 %&'$+4 '$090080402038 !"#$% &'%()* ( )*+,- +,-./0123 4-56789:;<= YZ;<[ %./0 E G%12345 \]K^_`$67 KLMNO $89:;<=>?@ abc^ %89ABCDE F deXf %2012G5 H ghK^c^$IJKL/ BasicResearch on theDesign ofthe Permanent icBit SubApplied in Ranging System ADissertation SubmittedfortheDegreeofMaster OnMeasuringandTestingTechnologiesandInstruments BySunDa-peng UndertheSupervisionof -kun SchoolofMeasuringandOpticalEngineering NanchangHangkongUniversity,Nanchang, China May , 2012 I ij MNO%PQRSTUVWXYZ[\]^/_`abcdeUVW_Z [faghijO%PQRSklbmSkn_opqrsbQRSArtS uvwxyUVWZz_{|<=}~by !rs<=["_~/#$% &q'()*QRSA+S_uvwxbk,-./~%&0123*456 788;<=A9:b;<<=9:=_>7?***@AyB=_{|C%qDE FGHT<<=_*+*IJ["fabT<%&_*+AKLbg]MN- .UVWZ[OP=_<=Q&bRLFHS{<=_TUVW><=XYb hiZE[\_UVWO%PQRS]S<=A9:b^_`a FUVWb cZ[Dd_efg["q hi&zNjkolA9m%nSDE_opbT56788;qr=> 7?***@P:_st%&XY,cuqvwbxNC78_S{styzJ7{ |}o~` !"#$%tq&b'7{|}o~)N%tqL(=1)~ * - ( l n m M , , +,b%tqL(=B-1)~* - ( z y x P , , +.,_X,Y, Zo /_78%0:12p3B4bMNC78yz>75P:sh6ybP:7 !89:E75;0opb<xNANSYS]=>?***@XY,jkol%nb ABC8975;0kDE_75;0op3CFbTDE75;0op=S G>7H}(IJ/KT>7?***@.,_78/K_LMXY%nb<xN ANSYS]=>?***@XY,jkol%nbv$IJ/KA:E75.,78N OP'}(_{qbSG>7H}(IJQKb"RSL(=.,_78NO QN3DTbxU)V_9mTWX%nXY9mmYb)*yzA9mSD EqxUTUVWZ[UE=ZN_56788;qr=>7?@_st%& _*+bkD[P:\i]^.,_`abcd78NO/ce$_>7?@ 7f,stg*+ghbTUVWZ[=_#$%&_-.\]i3)jbk glX FUVWZ[.m_XnA["q klm%UVWb56788;qr(RMRS)b]=>%nb>7?@ II Abstract Therearemanyadvantagesinusingmulti-branchhorizontalwellstodevelop coal-bedmethane(CBM).Inthefuture,thedevelopmenttrendofCBMwillbe formedwithmulti-branchhorizontalwellsprimarily,verticalwellsforauxiliary mode. At present, the big bottleneck problemforCBM developmentis the horizontal wellspreciseconnectivity?Inordertosolvethisproblem,ic RangingSystem(RMRS)isnecessarytobedeveloped,ic binationthedomestic andforeignofthepresentresearchsituationandthedevelopmenttrend,theresearch onthisproblemandbreakthroughcansolvethetechnicalpr