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，怎么强调都不为过。振动可能是破坏性的，恼人的，或危险的，并且是一个在大量情况下发生的问题，从车辆的悬挂系统到保护包装，再到地震期间的基础设施减灾。本文研究的目的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，以确定最佳的隔振方法。这项研究的结果将允许在有益的情况下（隔振）利用通常不希望的效果（屈曲）。提出的隔振器是后屈曲刚性连杆机构，支柱和板。它们将被设计成在静载荷下具有高轴向刚度，以便它们在没有过度位移的情况下支撑系统的重量，并且在激励期间具有相对较低的刚度。谐波，多频，冲击，冲击和随机输入将被考虑，以及这些的组合。隔离器可以保护系统免受基础激励（例如，在地震中），或者可以减少系统力的传递性（例如，在地震中）。（旋转机械）到底座。这些无源隔离器可以与阻尼器和半主动或主动控制系统一起使用。将确定隔离器的最佳性能、位置和数量。这种方法的智力优点包括在不稳定性和结构动力学之间架起一座桥梁。这种思想的交融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。飞机的降噪、隐身技术和颤振抑制只是这项工作可能发展的一些方向。分布式安装选项的减震，和高周期疲劳缓解，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之间的合作建议。每个机构都将从增强的互动中受益。两所大学的邻近和主要研究人员以前的合作工作提供了一个团队，其总和大于单个组成部分。将寻找代表性不足的研究生和本科生，并将广泛传播这项研究的结果。

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.