時滯反饋控制對懸臂輸液管系統(tǒng)穩(wěn)定性的影響.pdf

1、同濟大學航空航天與力學學院碩士學位論文時滯反饋控制對懸臂輸液管系統(tǒng)穩(wěn)定性的影響姓名：袁芳申請學位級別：碩士專業(yè)：一般力學與力學基礎(chǔ)指導教師：徐鑒20080201AbstractABSTRACTThefluidinducedoscillationofthepipeconveyingfluidisafluidsolidinteractionproblemTheproblemresearchedprofoundlyaffecteveryone

2、lifeandworkeverydayThroughthedevelopmentofmorethan100years，peopleconstantlystudythetypicalsystemforcontrollingvibrationofthepipeconveyingfluidAlongwimthemoderntechnologydevelopmentbyleapsandboundsthetimedelayedfeedbackco

3、ntrolvibrationtechniqueisanewoneofactivevibrationsuppressionIthasgraduallybecomeoneofthemostchallengeproblemsinacademeandengineeringInthispaper，weproposeadelayedfeedbacktocontrolthevibrationoftheverticalcantileverpipecon

4、veyingfluidBasedonmodeanalysistheorytheDirectMethodisemployedtoanalyzethestabilityofthedelayedfeedbackcontrolsystemThefocusistheeffectofthegainandtimedelayonthecriticalvelocityofflowThemainworksincludethefollowingaspects

5、(1)RecentresearchonthepipeconveyingfluidsystemdomesticandabroadissummarizedandconcludedThedelayedfeedbacktocontrolthevibrationoftheverticalcantileverpipeconveyingfluidisproposedfirstly(2)Thedelayedfeedbackdynamicalequati

6、onsoftheverticalcantileverpipeconveyingfluidarededucedthroughaddingthedelayedfeedbackobjectThepartialdifferentialequationistransformedintoasetofordinarydifferentialequationsusingtheGalerkinmethodThen，thestaticstabilityof

7、firsttwomodesaboutthesystemisdiscussedusingtheDirectMethodTheeffectofthegainandtimedelayontheperformanceofimprovingthecriticalvelocityofflowalsoisinvestigatedinthisPapef(3)Takethedelayedpositionfeedbackandvelocityfeedbac