针对液压缸非线性约束下的轧机辊系振动行为

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1、学兔兔www.xuetutu.com第50卷第24期机械工程学报Vl01．5ONo．242014年12月JOURNALOFMECHANICALENGINEERINGDec．20l4DoI：l0．3901／JME．2014．24．059液压缸非线性约束下的轧机辊系振动行为水刘飞刘彬时培明侯东晓2(I．燕山大学信息科学与工程学院秦皇岛066004；2．东北大学秦皇岛分校控制工程学院秦皇岛066004)摘要：以四辊板带轧机为例，分析液压压下缸及弯辊缸在轧机辊系振动时表现出的分段弹性力和摩擦力两种非线性约束，建立液压缸非线性约束作用下的轧机辊系振动模型，并采

2、用平均法求得振动系统的幅频响应。通过比较两种非线性作用下辊系振动速度和振动幅值的仿真曲线，研究辊系受分段弹性力和摩擦力影响时的行为特性。取不同分段弹性力和摩擦力，仿真分析两种非线性因素分别对轧机辊系幅频特性的影响规律。结果表明，轧机辊系振动速度受分段弹性力大小影响，系统不稳定频率区域随分段弹性力增大而变宽；摩擦力较小时，对辊系振动行为影响表现为阻尼特性，较大时，摩擦力的非线性成为影响辊系振动行为的主要特性。该结论为轧机辊系振动控制提供了理论参考。关键词：液压缸；非线性约束；轧机辊系；幅频特性中图分类号：TH113VibrationBehaviorof

3、RollSystemunderNonlinearConstraintsoftheHydraulicCylinderLIUFeiLIUBinSHIPeimingHOUDongxiao(1．InstituteofInformationTechnologyandEngineering，YanshanUniversity,Qinhuangdao066004；2．InstituteofControlEngineering，NortheastUniversityatQinhuangdao，Qinhuangdao066004)Abstract：Withfour-h

4、ighplatemillasanexample，twononlinearconstraintsthataresegmentedelasticforceandfrictionforceofhydraulicscrew-downcylindersandbendingcylindersinrollingmillrollsystemvibrationareanalyzed，themodelthatnonlinearrollsystemvibrationunderthenonlinearconstraintactionfromhydrauliccylinder

5、isestablished，andamplitude—frequencyresponseofthevibrationsystemisobtainedbyusingaveragemethod．ThebehaviorcharacteristicofrollsystemundertheactionofsegmentelasticforceandfrictionforceisstudiedbyanalysisofvibrationcHrvesunderthefunctionproducedbytwokindsofnonlinearfactors．Thelaw

6、ofamplitude—frequencycharacteristicsofrollsysteminfluencedbytwokmdsofnonlinearfactorsrespectivelyisstudiedbytakingdiferentsegmentedelasticforceandfrictionforce．Theresultsshowthatvibrationspeedisafectedbythemagnitudeofelasticforce，theinstabilityfrequencyareaiswiderwithincreaseso

7、fsegmentedelasticforceincreasing，andtheinfluenceonthevibrationbehavioroftherollsystemtumsdampingintononlinearwithfrictionforceincreasingly．Thisconclusionprovidesatheoryreferenceforrollsystemvibrationcontro1．Keywords：hydrauliccylinder；nonlinearconstraints；rollsystem；amplitude—fr

8、equencycharacteristic要课题。0前言针对板带轧机的辊系振动问题，学者们从多种角度进行了研