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ME学术论坛第三十七讲伊利诺伊大学香槟分校Alexander F.Vakakis教授讲座预告
来  源: 机械工程学院 日  期: 2017-11-23 点击率: 1381
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    学术报告题目:

    Intentional Use of Strong Nonlinearity in Engineering Dynamics and Acoustics

    强非线性在动力学和声学工程中的主动设计和应用
    报告人:

    世界著名非线性动力学专家、伊利诺伊大学香槟分校(UIUC)机械科学与工程系Grayce Wicall Gauthier教授、航天工程和计算科学与工程跨学科教授、国家高端外国专家、省外专千人Alexander F. Vakakis博士
    时间:

    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
    
    内容概要:
    We implement intentional strong nonlinearity for targeted energy transfer and passive energy management in structural and mechanical designs. By nonlinear targeted energy transfer we denote passive, nearly one-way transfer of vibration or shock energy from an excited or self-excited primary system to a set of local, dissipative and essentially nonlinear (i.e., non-linearizable) attachments (termed nonlinear energy sinks – NESs) where energy is spatially confined and locally dissipated. Although the NESs are local devices, due to their strong nonlinearity they can affect the global dynamics of the primary system to which they are attached, over broad frequency and energy ranges. The NESs then act, in essence, as passive, broadband and adaptive boundary controllers, and are fully tunable with energy. What governs the dynamics of the NESs is isolated or cascades of transient/permanent resonance captures with different modes of the primary system. In a broader context we consider passive nonlinear redistribution of energy within an existing linear modal structure of a system, or directed energy exchanges between sets of linear modes and nonlinear modes induced by strong nonlinearity. We will discuss two specific applications of intentionally nonlinear designs. First, blast and shock mitigation of large-scale structures through the addition of NESs with smooth and non-smooth stiffness nonlinearities; and, then, a new class of nonlinear acoustic metamaterials based on ordered granular media with capacity for nonlinear acoustic filtering and passive wave redirection. Theoretical, computational and experimental results will be presented.
    
    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,他也是美国机械工程学会会士、ASME Journal of Applied Mechanics期刊副主编、ASME Journal of Vibration and Acoustics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2015-2017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。