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  • "學萃講壇”第967期—Vibration and Stability of Distributed Structural Systems

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    報告題目:Vibration and Stability of Distributed Structural Systems
    報  告 人:朱偉東
    報告時間:2019年5月30日(星期四)14:30—16:00
    報告地點:11號樓3067會議室
    主辦單位:科學技術研究院
    承辦單位:航天與建筑工程學院
    報告人簡介:Weidong Zhu is a Professor in the Department of Mechanical Engineering at the University of Maryland, Baltimore County, and the founder and director of its Dynamic Systems and Vibrations Laboratory and Laser Vibrometry Laboratory. He is a recipient of the 2004 National Science Foundation CAREER Award, the 2007 American Society for Nondestructive Testing Fellowship Award, the 2008 ChangJiang Scholar Visiting Chair Professorship in General Mechanics from the Ministry of Education of China, the 2009 Daily Record's Maryland Innovator of the Year Award, and the 2018 Hsue-Shen Tsien Engineering Science Lecture Professorship from the Institute of Mechanics of the Chinese Academy of Sciences. He has been an ASME Fellow since 2010, was an Associate Editor of the ASME Journal of Vibration and Acoustics from 2007-2014, and is a Subject Editor of the Journal of Sound and Vibration. His research spans the fields of dynamics, vibration, control, applied mechanics, structural health monitoring, wind energy, and metamaterials, and involves analytical development, numerical simulation, experimental validation, and industrial application. He has published about 150 SCI-indexed journal papers in these fields, and has five ASME best paper awards and five US patents.
    報告內容:Some interesting results on vibration and stability of distributed structural systems, vibration-based damage detection, and infinitely variable transmission are reviewed. Vibration and stability of translating media with time-varying lengths and/or velocities are addressed. Two types of dynamic stability problems are considered: dynamic stability of translating media during extension and retraction, and parametric instabilities in distributed structural systems with periodically varying lengths and/or velocities. The incremental harmonic balance method is used and modified to handle periodic responses of high-dimensional nonlinear models and their stability and bifurcations, as well as quasi-periodic responses. A new spatial discretization and substructure method, which ensures that all matching conditions of distributed components are satisfied, and hence uniform convergence of solutions, are discussed. The method overcomes drawbacks of classical assumed modes and component mode synthesis methods. New formulations of flexible multibody dynamics are developed with application to elevator traveling cables. A minimal number of degrees of freedom are needed to achieve the same accuracy as those of finite element and absolute nodal coordinate formulation methods. Nonlinear wave propagation in phononic structures and elastic wave cloaking are discussed. Two major challenges in model-based damage detection are addressed: accurate modeling of structures and development of a robustness algorithm for identifying locations and extent of damage. Non-model-based damage detection methods using scanning laser vibrometry and digital image correlation are also be presented. Finally, design, analysis, and control of novel infinitely variable transmission are discussed.


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