Condition Assessment and Capacity Evaluation of Historic Steel Bridge

历史钢桥状况评价及承载能力评价

• 批准号: 9319878
• 负责人: Ahmet Aktan
• 金额: $ 20万
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-09-15 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9319878&HistoricalAwards=false
• 关键词: Condition; Assessment; Capacity; Evaluation; Historic

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.

9402392 Aktan PI 获得了辛辛那提市的许可，可以在辛辛那提会议中心的宴会厅地板下安装主动振动控制系统。 在大型舞蹈活动期间，会发生高度明显的地板振动，引起舞厅顾客的担忧。 该控制系统将配备多个电磁执行器、数十种不同类型的传感器和模块化开放硬件系统，将在足够长的时间内保持安装状态，以便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/执行器的可用性来开发验证故障检测和适应算法，该算法将能够检测任何硬件/软件故障。 该算法将基于自适应模态滤波器概念，该概念已成功用于公路桥梁的主动控制。 还需要探索的是控制系统的辅助能力的开发，以连续监控自身以适应结构特征中将发生的有意或随机的变化。 这种对设施特性的连续监测将允许将由于占用/所有者干预而导致的结构动态特性的变化与环境条件变化引起的大波动分开。 同样重要的是，现实的多输出装置有望揭示尚未发现的现象，例如与组件间相互作用相关的现象。 必须识别并解决这些问题，以便使这项技术得到广泛的行业认可。