关于美国伊利诺伊大学厄巴纳-香槟分校Alexander F. Vakakis教...
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报告人：Alexander F. Vakakis
时间：2017年11月24日（周五）上午10:00-11:00
地点：浙江工业大学朝晖校区（北门）“声学与振动”实验室，A220会议室
欢迎各位理事、会员及相关科研工作者积极参加！
报告人简介：
Alexander F. Vakakis于1984年获得希腊帕特雷大学机械工程系学士学位，于1985年获得英国伦敦大学应用力学系硕士学位，并于1990年获得美国加州理工大学应用力学系博士学位。1990年至今，Alexander F. Vakakis是美国伊利诺伊大学香槟分校（UIUC）的教师，现在是机械学院的Grayce Wicall Gauthier教授。同时，他也是是美国机械工程学会会士、ASME Journal of Applied Mechanics期刊副主编、ASME Journal of Vibration andAcoustics期刊 副主编、Meccanica 期刊副主编、Journal of Multi-body Dynamics期刊编委及Nonlinear Dynamics期刊编委。Alexander F. Vakakis教授是浙江工业大学2015-17年国家高端外国专家团队的核心成员，与浙江工业大学“声学与振动”实验室合作，进行固体和流体介质中波的分离与能量控制研究。
内容概要：
We implement intentional strong nonlinearity for targeted energy transferand passive energy management in structural and mechanical designs. Bynonlinear targeted energy transfer we denote passive, nearly one-way transferof vibration or shock energy from an excited or self-excited primary system toa set of local, dissipative and essentially nonlinear (i.e., non-linearizable)attachments (termed nonlinear energy sinks – NESs) where energy is spatiallyconfined and locally dissipated. Although the NESs are local devices, due totheir strong nonlinearity they can affect the global dynamics of the primarysystem to which they are attached, over broad frequency and energy ranges. TheNESs then act, in essence, as passive, broadband and adaptive boundarycontrollers, and are fully tunable with energy. What governs the dynamics ofthe NESs is isolated or cascades of transient/permanent resonance captures withdifferent modes of the primary system. In a broader context we consider passivenonlinear redistribution of energy within an existing linear modal structure ofa system, or directed energy exchanges between sets of linear modes andnonlinear modes induced by strong nonlinearity. We will discuss two specificapplications of intentionally nonlinear designs. First, blast and shockmitigation of large-scale structures through the addition of NESs with smoothand non-smooth stiffness nonlinearities; and, then, a new class of nonlinearacoustic metamaterials based on ordered granular media with capacity fornonlinear acoustic filtering and passive wave redirection. Theoretical,computational and experimental results will be presented.
时间：2017年11月24日（周五）上午10:00-11:00
地点：浙江工业大学朝晖校区（北门）“声学与振动”实验室，A220会议室
欢迎各位理事、会员及相关科研工作者积极参加！
报告人简介：
Alexander F. Vakakis于1984年获得希腊帕特雷大学机械工程系学士学位，于1985年获得英国伦敦大学应用力学系硕士学位，并于1990年获得美国加州理工大学应用力学系博士学位。1990年至今，Alexander F. Vakakis是美国伊利诺伊大学香槟分校（UIUC）的教师，现在是机械学院的Grayce Wicall Gauthier教授。同时，他也是是美国机械工程学会会士、ASME Journal of Applied Mechanics期刊副主编、ASME Journal of Vibration andAcoustics期刊 副主编、Meccanica 期刊副主编、Journal of Multi-body Dynamics期刊编委及Nonlinear Dynamics期刊编委。Alexander F. Vakakis教授是浙江工业大学2015-17年国家高端外国专家团队的核心成员，与浙江工业大学“声学与振动”实验室合作，进行固体和流体介质中波的分离与能量控制研究。
内容概要：
We implement intentional strong nonlinearity for targeted energy transferand passive energy management in structural and mechanical designs. Bynonlinear targeted energy transfer we denote passive, nearly one-way transferof vibration or shock energy from an excited or self-excited primary system toa set of local, dissipative and essentially nonlinear (i.e., non-linearizable)attachments (termed nonlinear energy sinks – NESs) where energy is spatiallyconfined and locally dissipated. Although the NESs are local devices, due totheir strong nonlinearity they can affect the global dynamics of the primarysystem to which they are attached, over broad frequency and energy ranges. TheNESs then act, in essence, as passive, broadband and adaptive boundarycontrollers, and are fully tunable with energy. What governs the dynamics ofthe NESs is isolated or cascades of transient/permanent resonance captures withdifferent modes of the primary system. In a broader context we consider passivenonlinear redistribution of energy within an existing linear modal structure ofa system, or directed energy exchanges between sets of linear modes andnonlinear modes induced by strong nonlinearity. We will discuss two specificapplications of intentionally nonlinear designs. First, blast and shockmitigation of large-scale structures through the addition of NESs with smoothand non-smooth stiffness nonlinearities; and, then, a new class of nonlinearacoustic metamaterials based on ordered granular media with capacity fornonlinear acoustic filtering and passive wave redirection. Theoretical,computational and experimental results will be presented.
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