旋转叶片叶尖间隙测量的关键技术研究

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1、天津大学博士学位论文旋转叶片叶尖间隙测量的关键技术研究姓名：马玉真申请学位级别：博士专业：测试计量技术及仪器指导教师：叶声华;段发阶20061001AbstractIt’Saproblemdesideratingsolutionforpowerindustry,energyindustry,aviationandshippingtOreal-timemeasuretherotatingbladetip'clearance．Theconventionalmeasurementtechniquemostlycomprisesdischargingprobeme

2、asurement，eddycurrentmeasurement,microwavemeasurement,ultrasonicmeasurement,capacitancemeasurement，X—radialmeasurementandopticaltrigonometrymeasurement．Anthesemethodshavedifferentlimitation．Toachieveappliedlevelfortipclearancemeasurementtechnique，foreignanddomesticscholarshavebeen

3、applyingthemtoresearchanewnon-contacttipclearancemeasurementtechniqueusingopticalfibersensor．ThisdissertationresearchesthetipclearancemeasurementtechniqueaccordingtOtherequirementandparameterofNewCenturyExcellentTalentsinUniversitySupportingProgram“Thekeytechniqueresearchoftipclea

4、rancemeasurementbasedonopticalfiber'’sponsoredbyNationalMinistryofEducation．nemainworkinthedissertationiSshownasfollows：1．Basedontheopticalfibersensorwithtwogroupsofreceivingfiber，threegroupsoffiberwereadoptedtorealizethemeasurementoftipclearance．Thesensorcannotonlyeliminatetheeff

5、ecttomeasurementresultsoflightsourcefluctuationandreflectivit、rvarietyoftipsurface，butalsoreducetheeffectofanglebetweenthetipsurfaceandsensorendfacetomeasurementresult．2．Themathematicmodeloftipclearancesensor,whichiSbasedonasinglebundleoffibertOtransmitlaserandthreegroupsoffiberto

6、receivereflectedlight，isdesigned；andwim廿lemodel，thesensorWasdesignedandoptimized，theconfigurationoffiberarrangingandparametersoforiginalclearanceandlinearrangeweredetermined．3．ThemagnifyingandprocessingcircuitofhighprecisionunderstaticstateWasdesignedtomeasurethetipclearanceeffect

7、ively．Byspatialsurfacefittingwithlotsofexperimentdata,withinthemeasurementrange，theeffectofanglebetweenthetipsurfaceandsensorendfacetomeasurementresultwasavoided．4．Byanalyzingthesignalcharacteristicofonegroup，twOgroupsandthreegroupsreceivingfiber,thesensorprecisioncomparingandvali

8、datingmethodisdonewithlightpowerr