基于实时频率识别的调频TMD竖向振动控制试验研究

Experimental study on vertical vibration control of frequency modulation TMD based on real-time frequency identification

为了克服传统调谐质量阻尼器(tuned mass damper,TMD)频率不可调整的缺陷,提出一种基于磁流变弹性体(magnetorheological elastomer,MRE)的新型调频TMD装置,使得当TMD频率与受控结构的自振频率相吻合时,可以起到较好的减振效果。为了分析调频TMD的减振性能,研究了MRE剪切模量与电流的关系,采用希尔伯特-黄变换(Hilbert-Huang transform,HHT)和自然激励技术(natural excitation technique,NExT)相结合的方法配合Simulink/dSPACE实时频率识别系统对钢梁进行实时频率识别,分析了传统TMD和调频TMD在不同附加质量块数量下对钢梁的减振效果。研究结果表明,调频TMD的减振控制效果明显优于传统TMD,且调频TMD能够在钢梁自振频率发生变化时保持较好的减振效果。基于实时频率识别的调频TMD能解决传统TMD频带较窄和频率敏感等问题,使得调频TMD在较宽频带上有着更好的控制效果。

In order to overcome the defect of non-adjustable frequency of the traditional tuned mass damper(TMD), a new type of frequency modulation TMD device based on magnetorheological elastomer(MRE) is proposed. When the TMD frequency matches the natural frequency of the controlled structure, a better role of vibration reduction effect can be achieved. In order to analyze the vibration damping performance of frequency modulation TMD, the relationship between MRE shear modulus and current was studied. The method of Hilbert-Huang Transform(HHT) and natural excitation technology(NExT) combined with Simulink/dSPACE real-time frequency identification system was used to identify the real-time frequency of the controlled structure and analyze the vibration damping effect of traditional TMD and frequency modulation TMD on steel beams under different numbers of additional masses. The research results show that the vibration damping control effect of frequency modulation TMD is obviously better than that of the traditional TMD, and the frequency modulation TMD can maintain a good vibration damping effect when the natural frequency of steel beam changes. The frequency modulation TMD based on real-time frequency identification can solve the problems of traditional TMD, such as narrow frequency band and frequency sensitivity, which makes frequency modulation TMD have better control effect in a wider frequency band.