SPRT检验法和小波变换法在管道泄漏检测中的应用

.2005.13(9)ComputerMeasurement&Control903:2005-02-10;:2005-03-01:(ZR-96-030):(1963-),,,,:1671-4598(2005)09-0903-02:TP274.5:BSPRT李炜,朱芸,毛海杰,李应启(,730050):,;,(SPRT),,,,;,:;;;;PipelineLeakDetectionBasedonSPRTandWaveletTransformLiWei,ZhuYun,MaoHaijie,LiYingqi(CollegeofElectricalandInformationEngineering,LanzhouUniv.ofTechnology,Lanzhou730050,China)Abstract:Singledetectionmethodhassomeshortcomings,andisnotenoughtomeettheneedsofthefieldtest.Twoquestionswhichoftenappearinthepipelineleaksdetectionisanalyzed,andSPRTandcompensationmethodofdelaydetectionisappliedtoenhancethevelocityofleaksdetection.Thenthewavelettransformisusedtolocateleaks.Themethodnotonlydisposesofthedisturbanceyawp,butalsoshortenstheresponsetimeofleaksdetection,andheightentheprecisionofleakslocation.Intheexperimentaltest,itisfoundthatthismethodcanovercometheSPRT'sshortcomings,sothemethodhaswiderapplication.Keywords:pipeline;leaks;sequentialprobabilityratiotest;wavelettransform;detectdelay0,SCADA,,,,,,,1(1)1,2,,(2)12,21,,,(1)(2),,,,,,1(SequentialProbabilityRatioTestSPRT),(),,,,,,,,[1]q(t)=qin(t)-qout(t)-v(t)(1),q(t);qin(t);qout(t);v(t);t,q(t),,Gauss,,2;,+,q(t),,2,x=[q(t)-],N(0,1),!=()/,:90493H0:!=0,H1:!=!1:,!1,,2,∀[2]:∀=!ni=1lnf(xi,!1)f(xi,0)=!1!ni=1xi-n!212(2)∀#,∃H1,!=0,H01-#;,!=!1,H11-∃SPRT,A=1-∃#,B=∃1-#(0B1A),SPRT:(1)∀∀lnB,H0,,;(2)∀#lnA,H1,,;(3)lnB∀lnA,,SPRT,SPRT,,SPRT,SPRT(1),,!1[3],!1[2]!1!,SPRT(2)∀i∀lnB0,,∀,,∀lnA,22[4]:∀=!ni=1lnf(xi,!1)f(xi,0)=∀n-1+∀n(3)∀n-1=!n-1i=1lnf(xi,!1)f(xi,0)(4)∀n=f(xn,!1)f(xn,0)=0H10H0(5),H0,H1,,,∀,,,∀lnA,,2,k,,,,U,U=0∀i#0-∀i∀i0(6)33,,∀i,∀i,∀%1,,;,3,,,,,,,44,,∃%,Daubechies(db1),,5(907)9,:90723[6],,:66,x0,x2,x1,:#=∃-x1-x0x2-x02&∃AD,x0,x1,x2,,,6,,x0,x1x2y0,y1y2:,,,,,,,3,4%,,,,,:[1].[J].,1999,28(6):41-42.[2].[J].,1999,28(6):23-27.[3],.[J].,1998,(3):35-39.[4],,.[J].,2002,(4):41-43.[5]ChungCM,LeeMC.Object-orientedprogrammingsoftwaremetrics[J].InternationalJournalofMiniandMicrocomputers,1994,16(1):7-15.[6],.[J].,1994,23(5):54-58.(904)5db15d1&2000d2,d(7)X=L(v-u)+(v2-u2)∋d∋ts2v(7):L(m);v(m/s);u(m/s),;ts(s);d(m)4,,50s,,SPRT,,,,,,:[1]WhaleyRS.Tutorialonsoftwarebasedleakdetectiontechniques[J].ScientificSoftware-Intercomp.PipelineSimulationInterestGroup,1992,(10).[2],,.[J].,2004,33(2):46-49.[3]BergerJO.[M].,,.:,1998.[4],,.[M].:,1998.