一种半主动负刚度动力吸振器  

A semi-active negative stiffness dynamic vibration absorber

作　　者：邢昭阳 申永军 邢海军[1] 李向红 XING Zhaoyang;SHEN Yongjun;XING Haijun;LI Xianghong(Department of Mechanical Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;State Key Lab of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Department of Mathematics and Physics,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学机械工程学院,石家庄050043 [2]石家庄铁道大学交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [3]石家庄铁道大学数理系,石家庄050043

出　　处：《振动与冲击》2021年第15期123-128,136,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(11772206,U1934201)。

摘　　要：向振动控制系统中引入负刚度可以有效抑制系统的共振振幅,但是由于负刚度的特性,系统在低频区的响应会被放大。为了改善这一问题,将基于频率识别的控制策略应用到负刚度动力吸振器,通过短时傅里叶变换对外界激励信号进行时频分析以追踪频率随时间的变化情况,从而相应地改变系统的负刚度。在简谐激励和非平稳激励下与已有的模型进行了对比,证明了该模型具有更好的低频减振性能,能够在整个频率域内衰减系统振动。Introducing negative stiffness into vibration control system can effectively suppress its resonance amplitude,but due to characteristics of negative stiffness,the system’s response in low frequency range can be amplified.Here,in order to improve this situation,the control strategy based on frequency identification was applied in the negative stiffness dynamic vibration absorber,and the short-time Fourier transform was used to do the time-frequency analysis for external excitation signal,track variation of its frequency versus time,and change negative stiffness of the system accordingly.Compared with the existing models under harmonic excitation and non-stationary excitation,it was shown that the proposed model has better low-frequency vibration reduction performance and can attenuate system vibration in the whole frequency domain.

关 键 词：动力吸振器 半主动控制 短时傅里叶变换 负刚度 

分 类 号：O328[理学—一般力学与力学基础] TH113.1[理学—力学]