Studies on Vibration Control of Structures and Machincs and Piping Systems in the Structures

(1)通过理论分析和实验研究，讨论了主动质量阻尼器和喷射推进作动器用于高层建筑结构减摇时的最优控制条件。经证实，即使在兵库县南部地震（1995年）的情况下，这些方法对抑制高层结构的地震反应也是有效的。(2)设计并制作了不同楼板刚度的单层和双层木结构1/3缩尺模型，对其振动特性进行了理论分析和试验研究。通过研究，揭示了楼板水平刚度对木结构振动特性的影响。(3)新型被动和混合阻尼器的开发。被动阻尼器是利用V形板的塑性弯曲、薄金属杆的连续塑性弯曲和金属杆或板的塑性扭转的弹塑性阻尼器。这些弹塑性阻尼器具有高的疲劳寿命和屈服阻尼，即使在小位移。混合型阻尼器是由滚珠丝杠、铝盘、稀土磁体和压电致动器或电磁体组成的滚珠丝杠型阻尼器。通过理论分析和实验验证了混合阻尼器的减振效果。(4)研制了一种采用圆弧梁和磁阻尼器的二维隔振台。利用二维振动台测试了隔震台的频率响应和地震响应，验证了隔震效果。

(1) The optimal control conditions of an active mass damper and an actuator using jet propulsion when they are used to reduce the sway motion of a high-rise structure, induced by a strong carthquake, were discussed analytically and experimentally. It was confirmed that these methods are effective for suppressing the seismic responses of a high-rise structure even in the case of the Southern Hyogo-prefecture Earthquake (1995).(2) The 1/3 scale models of one and two-story timber structures with various floor rigidities were designed and produced, and the vibration characteristics of the structures were investigated analytically and experimentally. The influences of the horizontal rigidity of the floor on the vibration chracteristics of the timber structures were revealed through these investigations.(3) New types of passive and hybrid dampers were developed. Passive ones are clastoplastic dampers utilizing plastic bending of V-shaped plates, continuous plastic bending of thin metal rods and plastic torsion of a metal rod or plate. These elastoplastic dampers have high fatigue life and yield damping even for a small displacement. Hybrid ones are ball screw type dampers consisting of a ball screw, an aluminium disk, rare-earth magnets and a piezoelectric actuator or electromagnets. The effects of vibration suppression of the hybrid dampers were substantiated analytically and experimentally.(4) A two-dimensional isolation table using circular are beams and a magnetic damper was developed. The frequency and seismic responses of the isolation table were measured using a two-dimensional shaking table, and the effects of vibration isolation were confirmed.