喷气织机后梁系统动态行为分析与经纱张力控制

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1、苏州大学硕士学位论文喷气织机后梁系统动态行为分析与经纱张力控制姓名：梁林祖申请学位级别：硕士专业：机械设计及理论指导教师：冯志华20080301Abstract喷气织机后梁系统动态行为分析与经纱张力控制AnalysisontheDynamicBehaviorofBackRestSystemandtheControlofWarpTensionforanAir-jetLoomForthedevelopingoftextileindustry,newweavingmachineisincreasinglyused．Inhighspeed，t

2、heinstancethatvibrationbecomesmoreseriousandworkenvironmentofwarpendsgetsworsearefavorabletoendbreakageanditdropstheproductiveefjficiency．Thedynamiccharacteristicofbackrestwhichisthedetectingandregulatingelementofwarptensionisveryimportanttothefluctuationofwarptension．T

3、akingtypeW㈣000air-jetloomforsubjectresearchedandweavingprocessofcertaintabbyforinstance，themathematicalmodelofbackrestsystemoftheloomisbuiltinordertoresearchitsdynamicbehaviorandcontrolthewarptension．So，theschemeforreducingvibrationandmakingends’workingenvironmentbetter

4、canbefound．Firstly,theoperatingprincipleofmainmechanismsoftypeWG—-2000loomandtheireffectsonwarpareanalyzedsystematicallyandconclusionshavebeenmadethatsheddingmotion，beating-upmotion，warploosingmotionandbackrestoscillatingmotionaremajorfactorsresultinginthechangeofwarpte

5、nsiledeformation．Then，accordingtotheconditionthattheresultantmomentofspringforceandwarptensionabout也esameaxisiszero．thestaticmodelofbackresthasbeenbuilt．Furthermore，thestaticcharacteristichasbeenanalyzedandtheparametersusedindynamicanalysishavebeenobtained．Onthebasisofs

6、taticanalysisandconsideringthedampingmomentandinertialmoment,thesimplesingle．．degree．．of-freedomdynamicmodelofbackrestsystemisbuiltaccordingtotheequilibriumprinciple．Byfourth—orderRunge-Kuttaalgorithm，theoscillationofbackrestisnumericallyobtainedandthewarptensionisalsoc

7、alculated．Theresultshowsthattheoscillatingofbackrestandthechangingofwarptensiondrivetobemorecomplicatedandtheirrangeabilityandmeanvaluewilldiminish，butthenaturalfrequencyandthedampcoefficientwhichcankeepthewarptensionoptimumwillincrease，asthebeamdiameterbecomingsmallera

8、ndsmaller．Afterthat．themoreaccuratetwo-degree．of-freedommodelisbuilt．Thefurtherresearchonwhichtheeffectofbeamd