Exploring the Problems in Active Structural Control & Health Monitoring of Existing Constructed Facilities by Utilizing a Decommissioned Steel Truss Highway Bridge

辛辛那提基础设施研究所和辛辛那提大学结构动力学研究实验室正与惠普公司和Aura系统公司合作，在一座250英尺跨径的双车道钢桁架公路桥梁上设计并实现了主动质量驾驶员闭环控制系统。这座桥位于俄亥俄州富兰克林县，它将被辛辛那提基础设施研究所加载到破坏状态以进行结构鉴定。这项工作是由俄亥俄州交通部、联邦公路管理局和俄亥俄州富兰克林县共同发起的。利用将为破坏性试验项目开发的实地研究基础设施，探索设计和实现一种主动控制系统的问题现有设施易受扭转激励。在模拟一辆静止的卡车在一个车道的跨中行驶时，四个伺服控制致动器将对岩石锚起作用，逐渐将桥梁震动至破坏。通过冲击、谐波激振和车载试验，建立线性化的单元级模型，以反映桥梁的现有状态。这将是控制设计的基础。将安装广泛的应变、变形、位移和加速度仪器，用于无损和破坏性检测；其中一些将用于控制反馈。主动质量驱动系统将采用三个线性电磁线性执行器。硬件将用于信号调理和处理以及实现实时数字控制策略。针对现有状态设计的控制系统将在桥梁处于各种极限状态时进行测试。为了测试控制系统，将通过初始位移的突然释放（阶跃松弛）和线性伺服液压励磁器的正弦和宽带输入来激励桥梁。

The Cincinnati Infrastructure Institute and the University of Cincinnati - Structural Dynamics Research Laboratory are collaborating with Hewlett-Packard Co and Aura Systems, Inc. to design and implement an active-mass-driver closed-loop control system on a 250 feet span two-lane steel through- truss highway bridge. The bridge is located in Franklin County, Ohio and it will be loaded to destruction for structural identification by the Cincinnati Infrastructure Institute. This effort is being co-sponsored by the Ohio Department of Transportation, the Federal Highway Administration and Franklin County, Ohio. The field-research infrastructure which will be developed for the destructive test program will be exploited to explore the problems in designing and implementing an active-control system for an existing constructed facility which is vulnerable to torsional excitation. The bridge will be incrementally shaken-down to destruction by four servo-control actuators reacting against rock- anchors while simulating a stationary truck at mid-span in one lane. A linearized element-level model of the bridge will be identified by impact, harmonic forced-excitation and truck-load tests to reflect the existing state. This will be the basis for control design. Extensive strain, distortion, displacement and acceleration instrumentation will be installed for nondestructive and destructive testing; some of these will be used for control feedback. The active-mass driver system will utilize three linear electromagnetic linear actuators. Hardware will be used for signal conditioning and processing and for implementation of real time digital control strategies. The control system designed for the existing state will be tested as the bridge is located to various limit states. To test the control system the bridge will be excited by sudden release of an initial displacement (step relaxation) and by sinusoidal and broadband input from a linear servo-hydraulic exciter.