不同类型欧拉屈曲梁非线性吸振器动态特性的影响研究

Characteristics of different kinds of nonlinear dynamic vibration absorber using Euler-buckled beam

  • 摘要: 从工程实际出发,利用欧拉屈曲梁作为弹簧元件,考虑线性支撑弹簧和阻尼安装方式的变化,建立三种不同类型的非线性吸振器模型。利用所建模型,采用复变量?平均法,求解不同类型非线性吸振器模型的解析解。对比主振系幅频响应曲线,发现线性弹性支撑未接地时抑振效果最好。对部分欧拉屈曲梁非线性吸振器的主要设计参数,即初始挠度 q0,长度 L 和斜置倾角 θ 展开讨论,计算结果表明:将主振系谐振峰值最小作为评价指标,在分析频率范围内,上述三个设计参数均存在最优值。

     

    Abstract: From the point of view of practice engineering,three types of nonlinear dynamic vibration absorbers(NDVAs),which use the Euler-buckled beam as nonlinear stiffness element and take the effects of arrangements of the linear supporting spring anddamper into account,are presented. Based on above established models,the analytical solutions of the coupling systems with different kinds of NDVAs are derived by using complexification-averaging method. Compared with amplitude frequency response curves of the main vibrational system,the vibration suppression performance of the NDVA with ungrounded elastic support is the best. At last,some design parameters,which contain initial deflection q0,length L and initial oblique angle θ,are selected and investigated. According to calculation results,it can be concluded that there are optimal values for all above three design parameters when resonant peak of the main vibrational system is used as the evaluation index in the whole calculation frequency region.

     

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