資源描述:
《基于模態(tài)參數(shù)的工程結(jié)構(gòu)損傷識別方法的研究》由會員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、湖南大學(xué)碩士學(xué)位論文基于模態(tài)參數(shù)的工程結(jié)構(gòu)損傷識別方法的研究姓名:肖調(diào)生申請學(xué)位級別:碩士專業(yè):機(jī)械工程指導(dǎo)教師:于德介;陳稼祥2002.10.18繁要
2、(現(xiàn)代工程結(jié)構(gòu)正在向大型化、復(fù)雜化、崮幼化、連續(xù)化方向發(fā)展,復(fù)雜的服役環(huán)境譴縫攙麴遴行安全受至g藏脅。舞了保逐安全、避免災(zāi)難,實(shí)對、在線、≯鲞,確地進(jìn)行結(jié)構(gòu)損傷識別的技術(shù)研究受到了廣大學(xué)者和工程技術(shù)人員的羹視。蘆本文闡述了結(jié)構(gòu)故障診斷的技術(shù)手段、結(jié)構(gòu)損傷識別技術(shù)的內(nèi)容與要求,應(yīng)靂振動診凝方法進(jìn)行績梅授傷識鬟懿技術(shù)研究與痊震瑰款;論述了蒸予摟態(tài)參數(shù),‘艨柔度差毽法、魏率模態(tài)法避行結(jié)稿損協(xié)識稍豹理論與方法,遴麗攝搦了柔度差慎曲率法進(jìn)行绱構(gòu)損傷
3、識別的思想與方法。將以上三種損傷識別技術(shù)應(yīng)用于燕支粱、懸譬梁熬模搬損傷識剮,證實(shí)了基予粱度差值的攢傷定位方法存在模凝或者錨誤定霞熬}菇麓,蓬率模悉法可戮不簌籟鐨痿蔫靜繚擒參數(shù),毽對予小蒺費(fèi)也存在模糊定位的隱患。本文研究并提出了黎艘差值曲率法,多個模擬損傷實(shí)例說明該方法具有損傷識別靈敏艘贏、可靠性強(qiáng)、數(shù)值和圖形分析直觀簡便的最著霞點(diǎn)?!疚膽?yīng)用曲率模態(tài)法、桊廉差值曲率法當(dāng)中,對模怨參數(shù)用樣條播值,較好地解決了減少測點(diǎn)與保證識別精度的矛盾;程縫§£!坐熬娃中開發(fā)了識別程序:只囂輸入翦三除援爨輕頻率,幫露盤柔凄差值蕊率洼繪塞挨侮諼爨熬圖示與鼗篷{結(jié)巢。,∥關(guān)鍵譎:模態(tài)參≤,損傷函g柔菠差影柔囊蓑
4、俊蠢輦麴率溪態(tài)AbstractModemprojects仃uc眥sareproceedingatthedirectionofmaximization.complication,automationandcontinuousness.Thecomplicatedenvironmentsofservicethreatfunctionalsafetyofthestructure.Toguaranteethesafetyandavoiddisaster,thescholars,engineersandtechniciansarepayingattentiontotheresearchofident
5、ificationforthedamageofstructurereal—timely,on-lineandaccurately.Itelaboratesthecontentsandrequirementsofthetechniquemeaplsoffaultdiagnosisanddamageidentificationforstructure,andthepresentresearchandapplicationofdamageidentificationfors拄ucnlrewi也vibrationdiagnosistechnique;Basedonthemodalparameter
6、s,itdiscussesthetheoryandtechniqueofthedamageidentificationforstructurewit}ltheflexibilitydifierencemethodandcurvaturemodalmethod.thenpresenttheideaofdamageidentificationforstructure塒t}lflexibilitydifferencecurva缸emethod.Theapplicationofthethreedamageidentificationtechniquesaboveforsimplesupported
7、beamsandcantileverbeamsconfirmthatvagueorwronglocationwilloccurinthedamagelocationmethodbasedonflexibilitydifference.a(chǎn)ndthecurvaturemodalmethodneednotrelyonthest掰c建瞄lparameterbeforethedamage,buthasthehiddentroubleofvaguelocationforsmalldamage.Itstudiesandputsforwardtheflexibilitydifferencecurvatur
8、emethod,andmanysimulateddamageexamplesshowthatthemethodhasnotableadvantagessuchashighdamageidentificationsensitivity,strongneliability,andvisualizationandsimplicityinamountandgraphanalysis.Theuseofthebatteninterp