Fast Hybrid Test Platform for Seismic Performance Evaluation of Structural Systems

乔治E.小布朗地震工程模拟网络（NEES）计划是美国国家科学基金会主要研究设备计划资助的一个项目。 根据NEES计划，该合作协议在科罗拉多博尔德的科罗拉多大学建立了NEES快速混合试验平台，用于结构部件、子组件和系统的地震响应模拟。 位于博尔德的科罗拉多大学将指定、开发、购买/升级、建造、安装、调试和操作一个快速混合测试系统，该系统由高速致动器、数字控制器、数据采集系统、计算机和模拟软件组成，用于全尺寸和大比例的墙、柱、在地震期间经历的10%和100%之间的加载速率下进行实验混合测试的框架和框架。 这种能力是一个到两个数量级高于目前可用的拟动力试验。 该设备将于2004年或更早投入使用，并将作为国家共享的NEES设备站点进行管理，具有远程观测和远程操作能力，以便在2014年之前为大型结构系统提供新的地震工程研究测试能力。 该NEES设备站点将通过CU工程中心连接到NEES协作实验室，该工程中心已经具有千兆以太网连接。 共享使用的访问和培训将通过NEES联盟奖进行协调。 该奖项是对提交给NSF 00-6，NEES：“地震工程研究设备”项目招标的提案进行同行评审的结果。“根据该合同提供以下设备：（1）一个高速执行器，220 kip负载能力，+5 in冲程，250 gpm伺服阀，最大速度9 in/sec;（2）升级两个现有的110 kip，+5 in。斯托克执行机构，配有250 gpm伺服阀，最大速度为18 in/sec;（3）高性能数字伺服控制器，具有三个控制通道和三个变量控制能力;（4）高速数据采集系统，具有32个数据通道;（5）三个数字位移传感器;（6）十个模拟位移传感器;（7）三个频率范围高达500 Hz的加速度计;（8）三台个人计算机，用于数值模拟，使用Matlab和C++编译器进行数据处理，以及数据显示/远程观测连接;（9）扩大现有的数据采集系统，以适应远距离观测、远距离操作、远距离传输和远距离存储;以及（10）具有远程观察和远程操作能力的设备，以便通过高性能网络连接可以观察和控制设备上的实验。该设施的核心是数字控制器，计算机，其中被评估的结构的动力学建模和数值计算进行求解运动方程，以及控制和连接物理和数学子组件的软件（将作为本项目的一部分开发）。 复杂的执行器控制算法将作为该项目的一部分开发，它们是项目成功的关键。 该设施将是美国唯一一个具有完整子结构能力的同类设施（多个执行器）。 它将作为未来的大规模，多自由度的快速混合测试系统的测试床。大学已承付190 685美元，用于2001年至2004年控制室的建造和翻修工作、设备采购和对一名实验室技术员的部分支助。联合国大学将把这一快速混合测试系统纳入其本科生和研究生课程，并将主要通过使用万维网促进其他教育机构使用测试结果。 此外，从测试中获得的实验观察结果将被纳入正在进行的NSF赞助的K-12教育计划。 联合国大学还将通过研讨会和讲习班为外部研究人员提供培训机会。

The George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) Program is a project funded under the NSF Major Research Equipment Program. This cooperative agreement, under the NEES Program, establishes a NEES fast hybrid test platform for seismic response simulation of structural components, subassemblages, and systems at the University of Colorado at Boulder, Colorado. The University of Colorado at Boulder will specify, develop, purchase/upgrade, construct, install, commission, and operate a fast hybrid test system consisting of high speed actuators, digital controller, data acquisition system, computers, and simulation software for full size and large-scale models of walls, columns, frames and subassemblies under experimental hybrid testing at loading rates between 10% and 100% of that experienced during an earthquake. This capability is one to two orders of magnitude higher than currently available in pseudodynamic tests. This equipment will be operational by 2004 or earlier and will be managed as a national shared-use NEES equipment site, with teleobservation and teleoperation capabilities, to provide new earthquake engineering research testing capabilities for large structural systems through 2014. This NEES equipment site will be connected to the NEES collaboratory through the CU Engineering Center, which already has Gigabit Ethernet connection. Shared-use access and training will be coordinated through the NEES Consortium award. This award is an outcome of the peer review of proposals submitted to program solicitation NSF 00-6, NEES: "Earthquake Engineering Research Equipment." The following equipment is provided under this award: (1) One high-speed actuator, 220 kip load capacity, +5 in stroke, 250 gpm servo valve, maximum velocity of 9 in/sec; (2) Upgrade two existing 110 kip, +5 in. stoke actuators with 250 gpm servo valves to attain a maximum velocity of 18 in/sec; (3) High-performance digital servo-controller with three control channels and three-variable control capability; (4) High-speed data acquisition system with 32 data channels; (5) Three digital displacement transducers; (6) Ten analog displacement transducers; (7) Three accelerometers with frequency range up to 500 Hz; (8) Three personal computers for numerical simulation, data processing using Matlab and C++ complier, and data display/teleobservation connection; (9) Expansion of existing data acquisition system to accommodate teleobservation, teleoperation, teletransmission, and telestorage; and (10) Equipment for teleobservation and teleoperation capabilities so that experiments on the equipment will be observable and controllable via high performance network connections. The core of the facility is the digital controller, the computer where the dynamics of the structure being evaluate is modeled and numerical computation is performed to solve the equations of motion, and the software (to be developed as part of this project) which controls and links the physical and mathematical subassemblages. Sophisticated actuator control algorithms will be developed as a part of this project and they are the keys to project success. The facility would be the only one of its kind in the United States (multiple actuators) with full substructuring capability. It would serve as the test bed for future large scale, multi-degree-of-freedom fast hybrid testing systems. The University has committed $190,685 for the control room construction and refurbishing work, equipment purchase and partial support for a laboratory technician from 2001 through 2004. The University will integrate this fast hybrid testing system into its undergraduate and graduate curricula, and it will promote the use of the results by other educational institutions mainly through the use of the World Wide Web. Further, the experimental observations obtained from the test will be incorporated in an ongoing NSF sponsored K-12 educational program. The University will also provide training opportunities for outside researchers through seminars and workshops.