Damage Control of Transportation Structures Using Intelligent Magnetorheological Dampers

9912569 RoschkeUS Japan将在这里进行合作研究，重点是将强震对连续梁桥造成的破坏降至最低。调查将集中在磁流变(MR)阻尼器的获取、机器人神经模糊控制算法的开发、试验性全面实施以及测试期间轴承系统的损坏。其目的是通过在一个主要建造的设施中的一个子部件中通过补充减振来演示对振动的控制。磁流变阻尼器技术的成功迫在眉睫，需要多个大型实验来验证改善地震破坏效应的方法。美国德克萨斯州大学站的德克萨斯农工大学将建造一个磁流变阻尼器。研究团队的这一部分还将建立阻尼器行为的神经网络表示。同时，东京大学和德克萨斯农工大学将联合开发一种神经模糊算法，用于在地震激励下控制MR阻尼器。最后，阻尼器将被安装在一个在两个平面方向上同时运动的桥梁支座的全尺寸动态测试中。这项技术的成功示范旨在鼓励在城市地区建造和维护连续梁桥的政府机构考虑在新桥和改造桥设计中使用磁流变阻尼器作为辅助减振装置。该项目得到了NSF 98-36规定的第三年竞赛的支持。《美日城市防震减灾合作研究》

9912569RoschkeUS Japan collaborative research effort will be made here to focus on minimizing damage caused by a strong motion earthquake to continuous girder bridges. Investigations will center on acquisition of a magnetorheological (MR) damper, development o a robot neural-fuzzy control algorithm, experimental full-scale implementation, and damage of a bearing system during testing. The goal is to demonstrate control of vibrations through supplemental damping in a subcomponent of a major constructed facility. Success of magnetorheological damper technology is imminent and needs multiple large-scale experiments for verification of the approach to amelioration of damaging effects of earthquakes.A magnetorheological damper will be constructed at Texas A&M University in College Station, Texas, USA. This portion of the research team will also establish a neural network representation of the behavior of the damper. Concurrently, a neural-fuzzy algorithm will be developed jointly by The University of Tokyo and Texas A&M University for control of the MR dampers during seismic excitation. Finally, the dampers will be installed in a full-scale dynamic test of a bridge bearing that has simultaneous motion in its two in-plane directions. Successful demonstration of this technology is intended to encourage governmental agencies that construct and maintain continuous girder bridges in urban areas to consider using MR dampers as supplemental damping devices in new and retrofit bridge designs.This project is supported under the 3rd-year competition under NSF 98-36. "US Japan Cooperative Research in Urban Earthquake Disaster Mitigation."