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

结构及结构中机械及管道系统的振动控制研究

基本信息

批准号：
07455229
负责人：
KOH Tadaki
金额：
$ 4.67万
依托单位：
Meiji University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455229/
关键词：
Vibration control Seismic isolation Earthquake-proof design Damper Optimal control Wind-proof design Seismic response Vibration testing

项目摘要

(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.

(1)从理论和实验两个方面讨论了主动质量阻尼器和喷气推进作动器在抑制高耸结构在强震作用下的摇摆运动时的最优控制条件。设计制作了不同楼层刚度的单层和两层木结构的1/3缩尺模型，并对结构的振动特性进行了分析和试验研究。通过这些研究，揭示了楼板水平刚度对木结构振动特性的影响。(3)研制了新型被动阻尼器和混合阻尼器。被动阻尼器是利用V形板的塑性弯曲、金属细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很高的疲劳寿命和屈服阻尼，即使在很小的位移下也是如此。混合减振器是由滚珠丝杠、铝盘、稀土磁体和压电致动器或电磁体组成的滚珠螺杆式阻尼器。从理论和实验上证实了混合阻尼器的减振效果。(4)研制了一种基于圆弧梁和磁阻尼器的二维隔振台。利用二维振动台对隔振台的频率和地震反应进行了测试，验证了隔震效果。