简谐激励下磁流变弹性体支撑悬臂梁碰撞特性分析

Impact Analysis of Cantilever Beams Supported by MRE with Harmonic Excitation

利用磁流变弹性体在外加磁场作用下刚度可调可控的特点,基于剪切受力方式,设计以磁流变弹性体作为主要弹性元件的支撑结构,搭建简谐激励作用下悬臂梁碰撞故障实验系统.对不同外加磁场控制电流作用下系统的振动响应特性进行了实验测试,分析和研究了系统在不同控制电流下的移频降幅性能,以及碰撞工况下的振动响应.实验结果表明:在控制电流作用下,能有效增加磁流变弹性体的刚度,实现系统的固有频率和振幅的可控性;控制悬臂梁碰撞故障严重程度,提高设备寿命.

Using the adjustable and controllable characteristics of MRE (magnetorheological elastomers) under the action of applied magnetic fields, the structural support which takes MRE as the main elastic component was designed, and the cantilever beam's impact fault experimental system with harmonic excitation was established based on the mode of shear force. Then, the experimental tests of vibration response under the action of control currents with different applied magnetic fields were carried out, and the performances of frequency shift and amplitude reduction of the system as well as the vibration response under the condition of impact were analyzed. The results showed that the stiffness of MRE is increased effectively with the control current, the controllability of natural frequency and amplitude of the system is then realized, and the severity of impact fault becomes controllable and the equipment life is thereby improved. © 2016, Editorial Department of Journal of Northeastern University. All right reserved.