一种共振频率可调的振动放大器设计

On the design of a vibration amplifier with adjustable resonance frequency

采用电磁振动台开展结构疲劳试验研究时,常会遇到高频激振能力不足的问题,为此本文设计了一种融夹持与放大于一体的共振频率可调的振动放大器。首先,通过构建振动台-振动放大器-试件系统的动力学模型,分析振动特性并揭示了振动放大器的放大原理;然后通过三维辅助设计建模完成了振动放大器的结构设计,并结合有限元分析对振动放大器有效性进行验证;最后通过对比试验验证得到,该设计可以有效覆盖试件目标振型所对应的固有频率,并显著提高振动台的激振能力。

Structural fatigue experiment based on electromagnetic vibration generator system often encounters the problem of insufficient high frequency vibration excitation ability.In this paper,a vibration amplifier with adjustable resonance frequency is designed,which combines clamping and amplifying.Firstly,by constructing the dynamic model of the vibration table-vibration amplifierspecimen system,the vibration characteristics are analyzed,and the principle of the amplification of the vibration amplifier is revealed.Then,the structural design of the vibration amplifier is completed by three-dimensional auxiliary design,and the vibration characteristics of the vibration amplifier are analyzed by finite element analysis.Finally,the experimental results show that the design can effectively cover the natural frequency corresponding to the target vibration mode,and improve the vibration ability of the vibration table.