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Tony T.Y. Yang: Development of Next Generation Structural Engineering Laboratories
发布日期:2019-05-07  字号:   【打印

报告时间:2019年5月16日(星期四)9:00

报告地点:校学术会议中心一楼大报告厅

  Tony T.Y. Yang 教授

工作单位:加拿大英属哥伦比亚大学

举办单位:土木与水利工程学院

报告人简介

Tony T.Y. Yang,博士,教授,博士生导师,加拿大英属哥伦比亚大学(University of British Columbia,简称UBC)教授,UBC智能结构实验室主任。入选第13批“千人计划”青年项目,教育部地震工程国际联合研究中心执行主任。Yang教授是加拿大规范制定委员会常务委员,美国西海岸高层结构抗震设计规范编制委员会委员、中国光华基金会的“光华”教授。Yang教授于2001年、2002在布法罗大学获得学士与硕士学位,2006在加州大学伯克利分校获得博士学位。主要从事结构抗震、结构试验与仿真技术,提出并发展了新一代基于性能的设计指南,该技术被美国应用技术委员会采用。提出了混合模拟、振动台非线性控制等先进的试验测试方法,发展了基于风险评估的城市仿真模型,在南、北美洲以及东南亚得到广泛应用,并写入加拿大以及相关国际规范。由于其杰出的工作,Yang教授也被众多国际知名研究机构邀请做特邀报告100余场次。

报告简介

The knowledge of earthquake engineering is largely gained through experimental testing. The most direct method to recreate the loading experienced by a structure during an earthquake is via shaking table testing. Conventional shake tables employ linear controllers such as proportional-integral-derivative (PID) or loop shaping to regulate the movement. However, it is difficult to tune a linear controller to achieve accurate and robust tracking of different reference signals under payloads. The challenges are mainly due to the nonlinearity in hydraulic actuator dynamics and specimen behavior. Moreover, tracking a high frequency reference signal using a linear controller tends to cause actuator saturation and instability. In this presentation, a hierarchical control strategy is proposed to develop a high performance shake table. The high-level controller utilizes the Sliding Mode Control (SMC) technique to provide robustness to compensate for model nonlinearity and uncertainties experienced in experimental tests. The performance of the proposed controller is compared with a state-of-the-art loop shaping displacement-based controller. The experimental results show that the proposed hierarchical shake table control system with SMC can provide superior displacement, velocity and acceleration tracking performance and improved robustness against modeling uncertainty and nonlinearities. In addition to shaking table testing, hybrid simulation (HS) is becoming a favorable alternative experimental method to shaking table test. This is particularly useful for the development of novel structural components and systems, where only a small portion of the structure needed to be experimentally tested. Traditionally, HS is displacement-based. Many successful tests have been accomplished. However, such a methodology is not suitable for specimens with high stiffness. In this presentation, a hierarchical displacement-based and force-based control framework for HS is presented. In this framework, a high-level controller generates either the force or displacement commands based on finite element formulation and regulated the force or displacement commend using low-level controller(s). A detailed formulation for the high-level controller is presented.

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