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时间:2019-10-24
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1、激励幅值对准零刚度隔振器特性的影响(二号黑体)刘兴天(四号仿宋)(铜陵学院机械工程学院XX级XX班1008090811)(71.号宋体)摘要(小五,黑体):捉出具冇负刚度特性的欧拉屈曲梁结构并分析其静态特性,将负刚度机构和线性隔振器并联使用,设计准零刚度隔振器。如果隔振器的载荷选用得当,系统将在零刚度点平衡,若载荷发生改变,系统平衡点将偏离零刚度点。考虑载荷的影响,对零刚度隔振器进行动态建模,并采用谐波平衡法求解准零刚度隔振器的响应。定义准零刚度隔振器平衡点不在刚度零点时系统的力传递率,分析激励幅值和载荷对隔振器性能的影响并和线性隔振器的性能进行比较。结果表明,所设讣的零刚度隔振
2、器具有低频隔振效果,具响应和隔振性能受到激励幅值和载荷的影响,可以使系统的特性从单纯的渐硕刚度向渐软刚度以及渐软•渐硬刚度混合的特性改变,并显著改变系统的传递性能。(小五,宋体)关键词(小五,黑体):负刚度隔振非线性系统谐波平衡法(小fi,宋体)中图分类号(小五,黑体):TG156(小五,TimesNewRoman)InfluenceofExcitationAmplitudeandLoadontheCharacteristicsofaQuasi-zeroStiffnessIsolator(小三,加粗)LIUXingtian1'2HUANGXiuchangU2ZHANGZhiyiu
3、2HUAHongxing1>2(小四,姓人写)(1.InstituteofVibration,ShockandNoise,ShanghaiJiaoTongUniversity,Shanghai200240;(五号)2.StateKeyLaboratoryofMechanicalSystemandVibration,ShanghaiJiaoTongUniversity,Shanghai200240)Abstract(小五,加粗):AnEulerbuckledbeamformednegativestiftnessmechanismisproposedandthestaticchara
4、cteristicofwhichisanalyzed・Aquasi-zerostiflnessisolatorisdesignedbyparallelconnectedthenegativestifthessmechanismandalinearisolator.TheEulerbuckledbeamstructurefunctionsasastiffnesscorrectortolowerthestiffiiessofthelinearisolator.Iftheloadischosenproperly,theequilibriumpointwillbesetatthezero
5、stiffnesspoint,anychangesoftheloadwillleadtheequilibriumpointdeviatingfromthezerostiffnesspoint.ThedynamicmodelisbuiltconsideringtheloadeffectandtheHarmonicbalancemethodisemployedtosolveforthedynamicresponseofthesystem.Forcetransmissibilityofthezerostiffiiessisolatorisdefinedandcomparedwithth
6、atofanequivalentlinearone.Theefleetofexcitationamplitudeandloadontheperformanceisanalyzed.Theresultsshowthattheforceexcitationamplitudeandloadcanchangethecharacteristicofthenonlinearisolatorfromahardeningstiffiiesssystemtoasofteningstiffnesssystemandevenamixedsofteninhardeningstiffiiesssystem
7、.Theexcitationamplitudeandloadalsohavegreataflectiononthetransmissibilityperformance.(小五)Keywords(小五,力口粗):NegativestiffnessVibrationisolationNonlinearsystemsHarmonicbalancemethod0前言(一级标题:四号,宋体)(正文:五号,宋体)随着精密工程、纳米工程等的发展,对隔离外界环境的振动提出了越来越高的耍求,例如
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