Condition Assessment and Capacity Evaluation of Historic Steel Bridge

9402392 Aktan PI获得了辛辛那提市的许可，在辛辛那提会议中心的舞厅地板下安装了主动振动控制系统。 在大型舞蹈活动中，高度可察觉的地板振动已经发生，引起舞厅顾客的关注。 该控制系统将配备几个电磁执行器，几十种不同类型的传感器和一个模块化的开放硬件系统，将在足够长的时间内保持安装状态，以允许国家计划中的其他研究人员参与许多基础，系统集成和实验演示方面。 该研究将利用多个传感器/执行器的可用性开发一个验证故障检测和住宿算法，将有能力检测任何硬件/软件故障。 该算法将基于自适应模态滤波器的概念，这是成功地用于主动控制的公路桥梁。 还需要探索的是控制系统的第二能力的发展，以连续监测自身，以适应结构特性中将发生的有意或随机变化。 设施特性的这种连续监测将允许将由于占用/所有者干预引起的结构动态特性的变化与环境条件变化引起的大波动分离。 同样重要的是，一个现实的多输出装置预计将揭示尚未发现的现象，如那些与组件间的相互作用。 这些问题必须得到确定和解决，以便使这项技术得到广泛的行业接受。

9402392 Aktan PIs obtained permission from the City of Cincinnati to install an active vibration control system under the ballroom floor of the Cincinnati Convention Center. Highly perceptible floor vibration has occurred during large dance events, causing concern to ballroom patrons. The control system which will feature several electromagnetic actuators, several dozens of different types of sensor and a modular open hardware system will remain installed over a sufficiently long time period in order to permit other researchers in the national program to participate in many of the basic, system-integration and experimental demonstration aspects. The research will make use of the multiple sensor/actuator availability for developing an validating failure detection and accommodation algorithms which will have the capability to detect any hardware/software failures. The algorithms will be based on the adaptive modal filter concept which was used successfully for the active-control of the highway bridge. Also to be explored is the development of a secondary capability of the control system to continuously monitor itself for accommodating the deliberate or random changes which will occur in the structural characteristics. Such a continuous monitoring of the facility characteristics will permit to uncouple the changes in the structural dynamic properties due to occupation/owner intervention from large fluctuations caused by ambient condition changes. As importantly, a realistic multi- output installation is expected to reveal as-yet-undiscovered phenomena such as those related to inter-component interactions. Such issues will have to be identified and addressed in order to bring this technology forward to widespread industry acceptance.