电流变体-砂浆复合梁结构的振动特性研究

Vibration performance of electrorheological fluid-mortar cantilever beams

利用电流变体作为驱动元件与基体砂浆材料结合制成智能悬臂梁结构,调节施加在电流变体上的电压,用锤击法瞬态击振测定其在不同电场强度下的自振频率,对频率随电场强度的变化规律进行了研究。实验结果表明电流变片埋置位置对复合梁的整体振动特性的影响比较大。

A mortar cantilever with filled electrorheological fluid was made to investigate the natural vibration frequency by hammering test. The changing rule of frequencies under different electric field intensity was analyzed. The main factors influencing the natural frequencies of the composite beams were examined. The experimental results indicate that the first and second order natural frequencies increased apparently with the increase of electric field intensity, however, the third order one is changeless. Moreover the position of electrorheological piece embedded in mortar beams has a lot of influence on the vibration performance. In addition, the physical mechanism why the changing of the applied voltage can alter the frequency of composite beam was discussed. This research sets up an experimental basis for the application of electrorheological fluid to the field of vibration control in civil engineering practice.