双轴式惯性激振器运转噪音与振动特性关系研究

针对双轴式惯性激振器运转时总在一定激振频率下出现振动噪声的问题，对不同连结条件下偏心块-转 轴系统的振动特性进行了动力学分析和探讨．运用理论分析和有限元仿真相结合的方法，对可能导致振动噪 声的相关动力学问题做了研究，并通过仿真结果比较了刚、柔不同连结条件下偏心块-转轴系统前8阶固有频 率及振型．利用LMS振动测试平台得到的，不同工作条件对应的加速度幅频曲线作为实验验证，总结得出双 轴式惯性激振器出现振动噪声的主要原因是一定激振频率下因系统共振引发的偏心块绕轴抖动，且边界条件 （支撑和约束）对合理构建仿真模型以及分析机械系统动态特性具有重要意义．
Thevibrationandnoiseofbiaxialinertialvibratorundercertainfrequencyareanalyzed.Thevibrationchar? acteristicsofeccentricblock-rotatingshaftsystemunderdifferentconnectingconditionsarediscussed.Usingthemeth? odofcombiningtheoreticalanalysisandfiniteelementsimulation,therelateddynamicsproblemsthatmayleadtovibra? tionandnoisearestudied.Thefirst8ordernaturalfrequenciesandvibrationmodesofeccentricblock-rotatingshaftsys? temunderrigidandflexibleconnectionsarecompared.UsingtheLMSvibrationtestplatform,theaccelerationamplitude frequencycurvesunderdifferentworkingconditionsareverifiedbyexperiments.Itisconcludedthatthemainreasonfor thevibrationandnoiseofthebiaxialinertialvibratoristhevibrationoftheeccentricblockcausedbythesystemreso? nanceatacertainexcitationfrequency.Moreover,boundaryconditions(supportandconstraint)areofgreatimportance inbuildingasimulationmodelandanalyzingthedynamiccharacteristicsofmechanicalsystems.