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

探索主动结构控制中的问题

• 批准号: 9201913
• 负责人: Ahmet Aktan
• 金额: --
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-08-15 至 1994-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9201913&HistoricalAwards=false
• 关键词: Exploring; Problems; Active; Structural; Control

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.

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在与惠普公司和 Aura Systems, Inc. 合作，在 250 英尺跨度的两车道上设计和实施主动质量驱动器闭环控制系统钢贯通桁架公路桥。 这座桥位于俄亥俄州富兰克林县，辛辛那提基础设施研究所将对其进行装载破坏以进行结构鉴定。 这项工作由俄亥俄州交通部、联邦公路管理局和俄亥俄州富兰克林县共同发起。 为破坏性测试项目开发的现场研究基础设施将用于探索为易受扭转激励影响的现有建筑设施设计和实施主动控制系统的问题。 桥梁将通过四个伺服控制执行器对岩锚产生反应，同时模拟单车道跨中的静止卡车，逐渐被摇晃至毁坏。 桥梁的线性化单元级模型将通过冲击、谐波强制励磁和卡车负载测试来确定，以反映现有状态。 这将成为控制设计的基础。 将安装大量应变、变形、位移和加速度仪器进行无损和破坏性测试；其中一些将用于控制反馈。 主动质量驱动器系统将利用三个线性电磁线性致动器。 硬件将用于信号调节和处理以及实时数字控制策略的实施。 当桥梁处于各种极限状态时，将测试针对现有状态设计的控制系统。 为了测试控制系统，桥梁将通过初始位移的突然释放（阶跃松弛）以及来自线性伺服液压激励器的正弦和宽带输入来激励。