A Novel Type of Vibration Isolator Utilizing Buckled Structures

一种利用扣状结构的新型隔振器

• 批准号: 0301084
• 负责人: Lawrence Virgin
• 金额: $ 26.98万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-05-01 至 2006-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0301084&HistoricalAwards=false
• 关键词: Novel; Type; Vibration; Isolator; Utilizing

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.

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。 振动可能具有破坏性、烦人性或危险性，并且是在许多情况下都会出现的问题，从车辆悬架系统到保护性包装，再到地震期间基础设施的减灾。 本提案中描述的研究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，以确定隔振的最佳方法。 这项研究的结果将允许在有益的环境（振动隔离）​​中利用通常不需要的效应（屈曲）。所提出的隔离器是后屈曲刚性连杆机构、支柱和板。 它们将被设计为在静态负载下具有高轴向刚度，以便它们支撑系统的重量而不会产生过度位移，并且在激励过程中具有相对较低的刚度。 将考虑谐波、多频、冲击、冲击和随机输入以及这些输入的组合。 隔离器可以保护系统免受基座激励（例如，在地震中），或者可以减少从系统（例如，旋转机械）到基座的力的传递能力。 这些无源隔离器可以与阻尼器以及半主动或主动控制系统结合使用。 隔离器的最佳特性、位置和数量将被确定。 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面临着重大挑战。 这种方法的潜在更广泛影响是深远的。 飞机的降噪、隐形技术和颤振抑制只是这项工作可能发展的一些方向。 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之间的合作提案。每个机构都将受益于加强互动。 两所大学的邻近性以及主要研究人员之前的合作工作提供了一个总和大于各个组成部分的团队。 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。