US-Tunisia Cooperative Research: Vibration Confinement in Seismically Excited Linear and Hysteretic Structures

0138083 Nayfeh描述：该奖项支持AliNayfeh教授，工程科学和力学系，弗吉尼亚理工学院和州立大学（VA Tech.）之间的合作研究项目，布莱克斯堡，弗吉尼亚州和博士萨米埃尔Borgi，工程系，突尼斯理工学院（EPT），突尼斯，突尼斯。研究人员将研究通过被动限制振动来控制地震激励的线性弹性或滞后结构。研究的目的是：（1）发展一种被动控制策略，它允许振动能量从结构转移到附加的被动元件，如对角支撑元件，从而降低结构的振动幅值，并使其更快地降到所需的平衡状态，但代价是减缓被动元件向其初始状态的收敛; B），以确保这种策略的灵敏度鲁棒性对参数的不确定性有关的质量，阻尼和刚度的结构;和c），以保持在被动元件的振动限制为各种类型的地震loadings.Scope：有害的地震和/或风振动的结构的保护是一个世界性的问题。在土木工程应用中，通过被动元件的辅助来限制振动来控制地震激励结构是一种新颖的设计方法。 这个想法与各个领域有关，例如机械系统和多层建筑。 Nayfeh博士在动力系统的线性和非线性控制方面的研究非常活跃。他将与El-Borgi博士和另外两名突尼斯教师合作。 El-Borgi博士在地震激励结构的非线性分析和控制以及大型土木工程结构的实验测试方面非常活跃。 资金由国际科学和工程办公室以及土木和机械系统司提供。

0138083 NayfehDescription: This award supports a cooperative research project between Professor AliNayfeh, Department of Engineering Sciences and Mechanics, Virginia Polytechnic Institute and State University (VA Tech.), Blacksburg, Virginia and Dr. Sami El-Borgi, Department of Engineering, Ecole Polytechnique de Tunisie (EPT), Tunis, Tunisia. The investigators will examine the control of a seismically excited linear elastic or hysteretic structure by passive confinement of vibrations. The objectives of the research are: a) to develop a passive control strategy which allows the transfer of the vibrational energy from the structure to added passive elements, such as diagonal bracing elements, resulting in reducing the vibration amplitudes of the structure and bringing it down to its desired equilibrium state more rapidly at the expense of slowing down the convergence of the passive elements to their initial state; b) to ensure the sensitivity robustness of such a strategy against parameter uncertainties related to the mass, damping, and stiffness of the structure; and c) to preserve the vibration confinement in the passive elements for various types of seismic loadings.Scope: The protection of structures from harmful earthquake and/or wind vibrations is a worldwide issue. The control of seismically excited structures by confinement of vibrations with the aid of passive elements is a novel design methodology in civil engineering applications. The idea is relevant to various fields, such as mechanical systems and multi-floor buildings. Dr. Nayfeh has been quite active in research on linear and nonlinear control of dynamical systems. He will collaborate with Dr. El-Borgi and two other Tunisian faculty members. Dr. El-Borgi has been quite active in nonlinear analysis and control of seismically excited structures and experimental testing of large civil engineering structures. Funding is provided by the Office of International Science and Engineering and the Division of Civil and Mechanical Systems.