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朱伟东教授学术报告

发布者:         发布时间:2018-01-08 10:27         浏览次数:

Title: Recent Advances in Dynamic System Research

(动力系统研究的一些新进展)

Professor Weidong Zhu

Department of Mechanical Engineering at the University of Maryland

时间:2018110日,上午10:00-11:00

地点:南一楼力学系三楼会议室

朱伟东教授简介:

朱伟东,美国马里兰大学终身教授,教育部长江学者讲座教授、国家千人计划特聘教授。朱伟东教授1994年毕业于加州大学伯克利分校机械工程系获得博士学位,2004年获美国国家自然科学基金CAREER Award2007年获美国无损检测学会奖,2010年当选美国机械工程师学会(ASME)会士,2007-2014年担任ASME Journal of Vibration and Acoustics副主编,将于2018年开始担任Journal of Sound and Vibration主题编辑。研究方向涉及动力学、振动学、控制、应用力学、结构健康监测、风能利用等领域,主要工作包括理论建模、数值模拟、实验验证及工业应用等,累计发表高水平论文110余篇。

Introduction of the presentation:

Some interesting results on the vibration and stability of distributed structural systems, vibration-based damage detection, and infinitely variable transmission will be reviewed. The vibration and stability of translating media with time-varying lengths and/or velocities will be 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 velocities. The incremental harmonic balance method is used for high-dimensional models of nonlinear distributed systems with general nonlinearities. A new spatial discretization and substructure method, which ensures that all the matching conditions of distributed components are satisfied, and hence uniform convergence of the solutions, will be discussed. The method overcomes the drawbacks of the classical assumed modes and component mode synthesis methods. A new nonlinear model of a slack cable with bending stiffness and arbitrarily moving ends is developed. Only one-tenth of elements are needed to achieve the same accuracy as that of the finite element method. The new methodologies are applied to elevator and other systems. The model-based damage detection will address two major challenges in model-based damage detection: accurate modeling of structures and the development of a robustness algorithm for identifying locations and extent of damage. Non-model-based methods using scanning laser vibrometry will be presented. Finally, design, analysis, and control of novel infinitely variable transmission will be discussed. Experimental results are presented to validate theoretical predictions.