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.

辛辛那提基础设施学院和辛辛那提大学 - 结构动力学研究实验室正在与惠普（Hewlett-Packard Co）和Aura Systems，Inc。合作设计和实施250英尺跨度两车型的Active Mass-ass驱动器闭环控制系统钢制桁架高速公路桥。 这座桥位于俄亥俄州的富兰克林县，辛辛那提基础设施研究所将被装载到破坏结构性识别。 这项努力由俄亥俄州交通运输部，联邦公路管理局和俄亥俄州富兰克林县共同赞助。 将利用为破坏性测试程序开发的实地研究基础架构，以探索针对现有构造的设施设计和实施主动控制系统的问题，这很容易受到扭转激励的影响。 这座桥将被四个伺服控制的执行器逐渐震动，以破坏岩石锚，同时模拟一条车道中的中跨的一辆固定卡车。 桥梁的线性元素级别模型将通过影响，谐波强制启动和卡车负载测试来识别，以反映现有状态。 这将是控制设计的基础。 将安装广泛的应变，失真，位移和加速仪器，以进行无损和破坏性测试；其中一些将用于控制反馈。 Active-Mass驱动器系统将利用三个线性电磁线性致动器。 硬件将用于信号调理和处理以及实施实时数字控制策略。 为现有状态设计的控制系统将被测试，因为桥梁位于各种极限状态。 为了测试控制系统，通过突然释放初始位移（步骤松弛）以及从线性伺服液压激发仪中的正弦和宽带输入来激发桥梁。