基于叶尖定时的低转速动叶片裂纹在线识别方法

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关键词：动叶片；叶尖定时；裂纹识别；低转速；叶尖偏移量 中图分类号： TH165+.3 ;TD441 文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.202508004

Online identification method for cracks in low-speed rotating blades based on tip-timing technique

YANG Siqian1²， DUANLixiang²， ZHANG Jiwang1³， HE Renyang13，WANG Rongren1，3 （1.China Special Equipment Inspection and Research Institute，Beijing 1Ooo29，China;

2.School of Safety and Ocean Engineering，China University of Petroleum，Beijing 102249，China;

3.Technology Innovation Center of Oil and Gas Pipeline and Storage Equipment Safety， StateAdministration forMarketRegulation，Beijing10oo29，China）

Abstract：Aimingattheproblemofonlineidentifiationofcracks inthemoving bladesoflow-spedturbomachinerysuchasmine ventilationfans（elowthefirst-orderfrequencyoftheblades），arecogntionmethodbasedontipimingvibrationmeasurementandtip displacementisproposedTedyamicdefomationcharacteristicsoftemovingbladesunderdiferentspeedsandcrackconditioswere analyzedtroughtheoreticalmodelingandfiniteeementsimulations，andthereltionshipbetweenthetiposetandthebadestatewas established.Acackientificatiotratesostructedbyompagteomeasudvaluofttipfseofthoingbladesih theoflinecalibratedvalus.Atestbenchforthecacktestoftemovingbladebasedonttiptimingpriniplewasdesigedandil，and 45groupsoftestswithdierentcrackpositions（bladetip，blade midle，andbladeroot）anddiferentcrack lenghs（the minmumrack length is 1/10 of the blade width）were carried out in the range of 500～3000r/min .The recognition accuracy of cracks with a size of 3mm or morereached 100% ，and the crack length recognition error was less than 5.33% underthe condition of havingprior knowledge of the crack location.hetestresultsshowtattepropoedmethodcanprovideanfectiesolutionforteoineidentificationofacksinlowspee moving blades.

eywords： rotating blades;tip-timing;crack identification;low rotational speed; blade tip offset

旋转叶片作为透平设备如矿用通风机、烟气轮机等的核心部件，其结构完整性对设备效率与安全至关重要。（剩余12145字）