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航空学院青年学术论坛第一〇九讲(两场报告)
2018-06-19 09:00   审核人:

间: 2018626日上午9:00-12:00

点: 航空楼A310

邀请人: 王栋 教授

报告一

报告题目:Some Examples of Complexity-induced Coexistence of Traveling and Standing Waves in One-dimensional Linear Elastic Continua

报告人:Prof. Lawrence A. Bergman Department of Aerospace Engineering University of Illinois at Urbana-Champaign

要:It has long been known, for non-dispersive one dimensional continua such as undamped linear elastic axial bars and taut strings of finite length subjected to harmonic base motion at one end, that a simple viscous damper at the opposite end can be designed to be a perfect absorbing boundary at a single operating frequency. However, development of the generalization, in which mode complexity due to a viscously damped local subsystem located nearly anywhere in the interior is employed to separate traveling and standing waves in the continuum, is a relatively new development. I will provide some background to the problem and discuss several examples including the taut string and the rigid circular acoustic wave guide. Some more recent results for a dispersive continuum, the Euler-Bernoulli beam, will also be briefly examined. The method provides the means to effectively transfer and localize vibrational energy within a continuum and may have application to isolation and energy harvesting.

报告人简介:Professor Lawrence A. Bergman received the B.S. in Mechanical Engineering from the Stevens Institute of Technology, and the M.S. in Civil Engineering and Ph.D. in Applied Mechanics from Case Western Reserve University. He works primarily in the areas of structural dynamics and control, nonlinear dynamics, applied stochastic processes, system identification, and computational methods. He is the author of more than 250 articles in archival journals and books, has co-authored one research monograph, edited or co-edited 6 volumes, and holds 5 United States patents. He was the co-recipient of the 1983 State of the Art in Civil Engineering Award and the 1999 Norman Medal from ASCE, and the recipient of the 2001 Senior Research Prize in Computational Stochastic Mechanics from the International Association for Structural Safety and Reliability. He was editor-in-chief of the ASME Journal of Vibration and Acoustics from 2000- 2004, and served as Chair of the Executive Committee of the Applied Mechanics Division of ASME in 2013-2014. Professor Bergman has been a faculty member at the University of Illinois at Urbana-Champaign since 1979, where he is currently research professor and professor emeritus in the Dep’t of Aerospace Engineering. He is a Fellow of ASME and an Associate Fellow of AIAA.

报告二

报告题目:Acoustic Wave Separation

报告人:卢奂采 教授

摘要:An anechoic environment is normally required to conduct accurate measurement of sound quantities generated by a soundsource of interest in practice of nearfield acoustic holography. In many cases in reality, however, it is impossible to provide such a kind of ideal acoustical environment, for example, measuring sound radiation using microphone array from complex and over sized vibrating structures in spaces with reflective boundaries; assessing in-situ noise level and objective sound qualities of equipment and products in manufacturing or operating environments. This talk presents a study of acoustic wave separation, aiming for obtaining accurate sound quantities from a targeted sourcein non-free sound field by eliminating the contribution from disturbing sources or reflecting boundary; directing acoustic energy to specified space to induce airborne acoustic impedance discontinuity for echoless sound space.

报告人简介:卢奂采博士,现任浙江工业大学教授,博士研究生导师,浙江省千人计划特聘专家,钱江学者特聘教,运河学者特聘教,国家高端外国专家团队带头人,丹麦B&K公司-浙江工业大学声学与振动实验室创建人、主任(2010-),浙江省“信号处理”重点实验室主任(2012-2016),浙江一带一路-俄罗斯科学院应用物理研究所声学与振动创新技术”联合研究实验室(重点实验室)主任(2017-),科技部“特种装备制造与先进加工技术”国家国际科技合作基地副主任(2013-),美国机械工程师学会噪声控制与声学部技术委员会委员,美国声学学会会员。研究领域:结构声学,近场声全息,声场重构与可视化,声源识别与定位,声波分离,声能定向控制,原位声学量测量,声学超材料,能量非互易传播,三维客观声品质参量可视化与评估NVH控制,环境噪声测量、分析与评估,潜器水声定位。

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