A Study on the Effect of Vibration Suppression of an Arm-Type Semiactive Vibration Control Device

复杂的三维柔性结构，如管道系统、起重机和塔式结构，在地震或强风中可能会导致复杂的振动。为了抑制这种指示振动，本研究开发了一种采用超磁致伸缩驱动器的三连杆AM型振动控制装置。振动控制装置由四个万向节、三个连杆和两个端面安装板组成。连杆和安装板通过万向节串联连接，每个万向节由钢球、球座、杠杆机构和磁致伸缩致动器组成。该装置与人体相似，能够在三个平移和转动方向上分别产生可控的摩擦力和扭矩。利用二维电液振动台，对振动控制装置支承的两自由度体系和三自由度体系的地震反应进行了试验研究。实验结果与计算结果进行了比较，验证了减振装置的减振效果和计算的正确性。减振装置的减振效果取决于杠杆机构弹性铰链的刚度。在此基础上，从理论和实验两个方面探讨了使万向节产生最大摩擦力的弹性铰链的优化设计方法。

Complicated three-dimensional flexible structures like piping systems, cranes and tower-like structures are likely to result in intricate vibrations during an earthquake or a strong wind. In this research, a three-link am type vibration control device using giant magnetostrictive actuators was developed in order to suppress such indicate vibrations. The vibration control device is composed of four universal joints, three links and two end mounting plates. The links and the mounting plates are connected in series through universal joints, and each universal joint consists of a steel ball, a ball holder, a lever mechanism and agiant magnetostrictive actuator. The device resembles a human ami and is able to produce controllable friction forces and torques in three translational and rotational directions, respectively.A trial vibration control device was made and the resisting force characteristics in three translational directions were measured. The seismic responses of a two degrees of fredom system and a three degrees of freedom system consisting of a mass and four coil springs and supported by the vibration control deve were investigated experimentally using a two-dimensional electrohydraulic shaking table. The experimental results were compared with the calculated ones, and the effect of vibration suppression of the device and the validity of the calculations were confirmed.The effect of vibration suppression of the vibration control device depends on the stiffnesses of the elastic hinges used in the lever mechanisms. Accordingly, the optimum design method of the elastic hinge for getting maximum frictional force generated in each universal joint was also discussed theoretically and experimentally.