Floor and Facility Vibration Mitigation Using Passive and Hybrid Nonlinear Energy Sinks

使用被动和混合非线性能量汇减轻地板和设施振动，CMS提案0344433PI：L.A.Bergman，UIUCT该提案探索了在被动或混合隔震和控制系统中使用新型非线性能量汇(NES)，以减轻地板和设施的振动。最近的研究证实，一个本质上是非线性的振子与一个线性振子弱耦合，可以引起从线性系统到非线性系统的能量泵浦现象。更具体地说，直接激励的线性系统的瞬时振动在一定条件下以单向、不可逆的方式传递出线性系统并进入非线性系统。这种能量抽运现象被发现是坚固和相当迅速的，使其成为有效的减振系统的极佳候选者。本文提出的工作将研究在高精度技术条件下将这种非线性能量接收器概念应用于隔振和控制，研究被动和/或混合隔振的各种策略，量化其性能，并探索改善能量传递的新方法。作为这项工作的一部分，还将开发结构控制方面的新教育前景，使更多的学生接触到结构工程研究和设计的一个重要的新领域。智能优点：提出的主要推力如下：为了确定NES用于隔振的实用性，计划对能量泵理论和非线性能量汇的设计和分析进行深入研究。为了满足这些需求，我们将继续推广非线性能量汇理论，在高精度技术应用中对非线性能量汇进行建模和仿真，对NES性能进行实验验证，并探索增强能量泵浦的机制。此外，该项目的总体目标是在结构动力学和控制领域创造新的教育机会。这将通过让本科生参与研究(通过每个PI.s机构的正式和非正式计划招募)和为研究生课程创建课程和课程材料来实现。此外，将通过远程学习、多媒体演示和其他电子通信技术更多地获得教育材料，满足现有专业人员的需求。更广泛的影响：本提案中概述的研究和教育活动代表了对在精密环境中隔离微振动问题的一种全新方法的审查。在耦合振荡器系统中使用共振捕获来诱导能量泵浦，为传递和消除不需要的振动提供了一种简单的方法，而不依赖于大的致动器力或复杂的控制方案。拟议的工作不仅将验证这种结构控制方法的实用性，而且还将改善和扩大我们对潜在现象的理解，使我们能够朝着更有效的系统前进。每个PI机构都有完善的设施，可以在活跃的工作环境中建造实验室和数值模拟，为研究活动提供足够的资源。此外，参与这项建议的所有院校都有高度发展的招聘计划和教学支援中心，帮助私人投资机构以直接的方式实现其拟议的教育职能。拟议工作的教育部分将通过努力招募本科生作为研究人员并创建将纳入课堂讲课的研究性材料来促进教学、培训和学习。此外，研究生的学习机会将通过传统的研究参与以及结构控制新课程的形成而产生。将通过开发教育多媒体材料来加强研究和教育的基础设施，这些材料将用于促进结构控制领域的继续教育。这也将为面临高精度技术设施翻新和/或设计的从业人员提供广泛传播相关科学和技术信息的手段。

Floor and Facility Vibration Mitigation Using Passive and Hybrid Nonlinear Energy Sinks, CMS proposal 0344433PI: L. A. Bergman, UIUCThe proposal explores the use of a novel nonlinear energy sink (NES) in a passive or hybrid isolation and control system in order to mitigate floor and facility vibrations. Recent investigations have verified that the presence of an essentially nonlinear oscillator weakly coupled to a linear oscillator can induce the phenomenon of energy pumping from the linear to the nonlinear system. More specifically, transient vibrations in the directly excited linear system were shown, under certain conditions, to be transmitted out of the linear system and into the nonlinear one in a one-way, irreversible fashion. This energy pumping phenomenon was found to be robust and quite rapid, making it an excellent candidate for an efficient vibration mitigation system. The work proposed herein would investigate the application of this nonlinear energy sink concept to vibration isolation and control in high-precision technology situations, studying various strategies for passive and/or hybrid vibration isolation, quantifying its performance, and exploring new approaches for improving energy transfer. New educational prospects in structural control would also be developed as part of this work, exposing more students to a vital new field of structural engineering research and design. Intellectual Merit: Major thrusts are proposed as follows: To determine the practicality of NES for vibration isolation, a thorough investigation of the theory of energy pumping and the design and analysis of nonlinear energy sinks is planned. To meet these needs, we will pursue extension of nonlinear energy sink theory, modeling and simulation of nonlinear energy sinks in high-precision technology applications, experimental verification of NES performance, and exploration of mechanisms for enhancing energy pumping. In addition, this project has the overall goal of creating new educational opportunities in the field of structural dynamics and control. This will be accomplished through the involvement of undergraduate students in research (recruited through formal and informal programs at each PI.s institution) and the creation of courses and course materials for graduate student classes. Also, the needs of current professionals will be addressed via greater access to educational material through distance Learning, multimedia presentations, and other electronic communication technologies. Broader Impacts: The research and educational activities outlined in this proposal represent an examination of a fundamentally new approach to the problem of isolating microvibrations in precision Environments. The use of resonance capture in coupled oscillator systems to induce energy pumping provides a simple means for transferring and eliminating unwanted vibrations that does not rely upon large actuator forces or complex control schemes. The proposed work will not only provide verification of the practicality of this approach to structural control, but it will also improve and extend our understanding of the underlying phenomena, permitting advances towards even more efficient systems. The existence of well-established facilities at each PI's institution will permit the construction of laboratory and numerical simulations in active working environments, supplying sufficient resources for the research activities. In addition, all of the institutions participating in this proposal have highly developed recruiting programs and instructional support centers, helping the PIs to realize their proposed educational functions in a straightforward way. The educational components of the proposed work will promote teaching, training, and learning through the efforts to recruit undergraduate students as researchers and to create research-based materials that will be incorporated into classroom lectures. In addition, learning opportunities for graduate students will be generated through both the traditional research participation as well as the forming of new courses in structural control. The infrastructure for research and education will be enhanced through the development of educational multimedia materials that will be used to promote continuing education in the field of structural control. This will also provide a means for broad dissemination of pertinent scientific and technological information to practitioners who are facing retrofitting and/or design of high-precision technology facilities.