A Novel Type of Vibration Isolator Utilizing Buckled Structures

避免或抑制振动的重要性是一个普遍关注的问题，无论怎么说都不为过。振动可能是破坏性的、恼人的或危险的，从车辆悬挂系统到保护性包装再到地震期间的基础设施减灾，这是一个在各种情况下都会出现的问题。这项研究的目标是开发一种基于弹性屈曲结构的新型隔振器。分析、数值和实验方法将与各种测试策略和组件一起使用，以确定隔振的最佳方法。这项研究的结果将允许在有益的环境(隔振)中利用通常不受欢迎的效果(屈曲)。建议的隔振器是后屈曲的刚性连杆机构、支柱和板。它们将被设计成在静态载荷下具有高的轴向刚度，以便它们在没有过多位移的情况下支撑系统的重量，并且在激励时具有相对较低的刚度。将考虑谐波、多频率、冲击、冲击和随机输入以及这些输入的组合。隔振器可以保护系统不受基础激励(例如，在地震中)，或者可以降低从系统(例如，旋转机械)到基础的力的传递率。这些被动隔振器可以与阻尼器以及半主动或主动控制系统一起使用。将确定隔离器的最佳属性、位置和数量。这种方法的智力优势包括在不稳定性和结构动力学之间架起了一座桥梁。这种思想的交叉融合正是使跨学科研究如此成功的活动类型。分析/数值工作和实验工作都包含重大挑战。这种方法潜在的更广泛的影响是深远的。降噪、隐身技术和飞机颤振抑制只是这项工作可能发展的部分方向。用于减震和高周疲劳缓解的分布式安装选项显然是可以实现的目标。这是杜克大学和弗吉尼亚理工大学的合作提案。每个机构都将从加强互动中受益。两所大学的接近，以及之前原则研究人员的合作，提供了一个总和大于个别组成部分的团队。这项研究的结果将被广泛传播，研究对象包括研究生和本科生。

The importance of avoiding or suppressing vibration is a universal concern that can hardly be overstated. Vibration may be damaging, annoying, or dangerous, and is a problem occurring in a vast array of situations ranging from suspension systems for vehicles to protective packaging to infrastructure hazard mitigation during earthquakes. The objective of the research described in this proposal is to develop a new class of vibration isolator based on elastically-buckled structures. Analytical, numerical, and experimental methods will be used together with a variety of test strategies and components to identify optimal approaches to vibration isolation. The results of this research will allow a generally undesirable effect (buckling) to be utilized in a beneficial context (vibration isolation).The proposed isolators are post-buckled rigid-link mechanisms, struts, and plates. They will be designed to have a high axial stiffness under static loading, so that they support the weight of the system without excessive displacement, and to have a relatively-low stiffness during excitation. Harmonic, multi-frequency, shock, impact, and random inputs will be considered, along with combinations of these. The isolator may protect the system from base excitation (e.g., in an earthquake), or may reduce the transmissibility of forces from the system (e,g., rotating machinery) to the base. These passive isolators may be used in conjunction with dampers and with semi-active or active control systems. The optimum properties, locations, and number of isolators will be determined. The intellectual merit of this approach includes a bridge between instability and structural dynamics. This type of cross-fertilization of ideas is exactly the type of activity that has enabled interdisciplinary research to be so successful. Both the analytical/numerical work and the experimental work contain significant challenges. The potential broader impacts of this approach are profound. Noise reduction, stealth technology, and flutter suppression in aircraft are just some of the directions in which this work could evolve. Distributed mounting options for shock absorption, and high-cycle fatigue mitigation, are clearly achievable goals. This is a collaborative proposal between Duke University and Virginia Tech. Each institution will benefit from enhanced interaction. The proximity of the two universities and previous collaborative work of the Principle Investigators provides a team whose sum is greater than the individual components. Underrepresented graduate and undergraduate students will be sought, and the results of this research will be disseminated broadly.