Study on Development of High Performance Seicmic Damper for Reducing Excess Response Amplitude

本课题的研究成果总结如下：(1)工业设施管道系统的动态特性是经济和安全设计中必须考虑的重要问题之一。管道系统通常通过导向、弹簧吊架、液压或机械缓冲器以及某些能量吸收器等装置在几个点上连接到支撑结构上。当摩擦阻尼器吸引注意时，由于滑动运动的最大位移受到设备间隙的限制，接触面的能量耗散量受到限制。为了增加消能量，提出了滚珠丝杠式磁摩擦阻尼器。该阻尼器期望通过将一个方向运动转化为滚珠丝杠的旋转运动来增加能量耗散。在这项工作中，明确了所提出的阻尼器的基本特性。考虑试验得到的参数，建立了数值模型，并将仿真结果与试验结果进行了比较。(2)研制了一种基于磁流变液的容量可调高阻尼装置。通过对阻尼器施加不同的动载荷，研究了在外加磁场和不外加磁场作用下阻尼器的阻尼特性。试验测得的最大阻尼力和可控能力分别接近300 kN和180 kN，在大型结构的半主动振动控制中具有实际应用价值。此外，仿真中使用的简单解析模型有助于预测磁流变阻尼力。

Research results of this project is summarized as follows :(1) The dynamic characteristics of piping system installed in industrial facilities have to be recognized as one of the significant issues in economic and safety design consideration. Piping systems are generally connected to supporting structures at several points by means of devices such as guides, spring hangers, hydraulic or mechanical snubbers and certain energy absorbers. When friction damper attracts attention, the amount of energy dissipation at contact surface is restricted, because the maximum displacement of sliding motion is limited by the clearance of the equipment. In order to increase the amount of energy dissipation, the ball screw type magnetic friction damper is proposed. This damper is expected to increase the energy dissipation by converting one directional motion to rotating motion by ball screw. In this work, the fundamental characteristics of proposed damper are clarified. The numerical model is made considering parameters obtained from testing, and the results from simulation are compared with the results from testing.(2) A capacity adjustable high damping device using an MR sluid was newly developed in this study. The damping characteristics with and without the magnetic fields were experimentally investigated by applying the several dynamic loading to the damper. The maximum damping force and the controllable capacity measured in the tests are almost 300 kN and 180 kN, which enables practical applications on semi-active vibration control of large-scale structures. Furthermore, it was confirmed that the simple analytical model used in the simulation is helpful for predicting MR damping forces.