管道震擊破壞檢測與定位系統(tǒng).pdf

1、濟南大學(xué)碩士學(xué)位論文管道震擊破壞檢測與定位系統(tǒng)姓名：初文杰申請學(xué)位級別：碩士專業(yè)：機械電子工程指導(dǎo)教師：艾長勝20080610ABSTRACTPipeoneofthefivemajortransportationtools，hasitsuniqueadvantagesinthetransportationofliquidgasandserosityWiththeadjustmentofthenationalenergystrategya

2、ndtheimplementationofthewesterndevelopmentstrategyChina’Spipelinetransportationindustryisrapiddevelopment，andthenumberisonthesharpriseItplaysanincreasinglyimportantroleinthenationaleconomyThepipelineleakagewouldcausehuge

3、economiclossesandseriousenvironmentalpollutionPipelineleakhastwoformsofnaturaldamageandthirdpartydamageandthelastformhasbecomethemainfactorSoquicklyandaccuratelydetectingthelocationhasaveryimportantpracticalsignificanceI

4、nthispaperoverheadgaspipelinedamagedetectionandlocationhavebeenstudiedmainlyprimarilyforthefollowing：(1)StudythemechanismoftheacousticwavepropagatingalongthemetaloverheadPipelineandtheoreticalandexperimentalresultsshowit

5、CallpropagateinformoftransversewaveandlongitudinalwavePutforwardamethodtodetectandlocatedamagepointbasedonthesoundpropagationvelocitydifferencebetweentransverseandlongitudinalwave，andgivektoexpressacousticvelocitydiffere

6、ncecoefficientthatisstatisticalfromexperiencedataTllenewmethodneednotstudytheacousticspeedwhatISvulnerabletointerferewithvariousfactorsintraditionalmethods，averagepositioningerrorinthedamagelocationandachievegoodresults(

7、2)Analyzedbypowerdensityspectrumanalysisandusingwavelettransformdecomposesignaltovariousband，whichshowthatfrequencybandofthehittingsignalmainlybetween200Hzand600Hz(3)Designavariablegainamplifierbasedontheinstrumentoperat

8、ionalamplifierAD620andeightbandsButterworthbandpassfilterwhichCanfilterlowfrequencyandhighfrequencynoiseinterferenceAfterfilterandamplification，thesignaltonoiseratiohasbeensignificantlyimproved，layagoodfoundationforlater

9、signalprocessing似1Adoptshorttimeenergyandcrosszeroratetodetecttheendpointofthetransversewaveandlongitudinalwave，Oilthisbasis，putforwardenergydifferencemethod，greatlyimprovetheaccuracyoftheendpointdetection佑)Thispapersele

10、ctedLPC2138basedonARM7astheCPUofmonitoringsystemtosatisfytheneedofrecognizedarithmeticandcompletedtheperipheralelectrocircuitdesignAtlastdatacollectionprogramhavebeencompiledKEYWORDS：Pipeline；ThirdPartyDamage；Location；Ac