Modeling and Synthesis of Multi-Stable Equilibria Devices

多稳态平衡装置的建模与综合

• 批准号: 0201433
• 负责人: S. Sreenivasan
• 金额: $ 24.09万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0201433&HistoricalAwards=false
• 关键词: Modeling; Synthesis; Multi; Stable; Equilibria

This research addresses the concept of using multi-stable equilibria (MSE) devices as a type of adaptive system. MSE systems are those that have more than one configuration at which their potential energy is at a minimum such that no power is required to maintain the equilibrium position. As opposed to adaptive structures that use active materials such as piezoelectrics and shape memory alloys, the adaptive states of MSE systems are passive and need only actuation to move among the stable states. Because of this focus on passive and nondissipative aspects of energetic systems, the impact of MSE systems is in improving system performance in terms of operating range, accuracy, reliability, and energy efficiency. The approach of the research is to synthesize MSE systems for specific engineering tasks such as designing devices to have specific stable geometrical configurations and/or natural frequencies at each equilibrium position. Although some analysis has been done on a few bistable structures, the significance of this research is in providing insight into the MSE design process by creating a synthetic, rather than analytic, approach to a more general class of systems. Some areas of application for MSE devices are those in which single operating points limit system efficiency, actuator characteristics inhibit a large range of adaptability, and where the minimization of dissipative effects are important. Fully compliant structures when combined with magnetic actuation lead to smooth nonlinear systems, which are amenable to accurate modeling. They also possess ultra-high precision and repeatability, and long system life due to wear-free operation. Such systems also have several advantages when scaled down to the micro-systems domain. The results of the proposed research should have broad impact on design and analysis of multi-state precision mechanical systems, adaptive transducers, passive human augmentation systems, and adaptive structures.

本研究提出了使用多稳态平衡（MSE）设备作为一种自适应系统的概念。 MSE系统是具有多于一种配置的系统，在这些配置下，它们的势能处于最小值，使得不需要功率来维持平衡位置。 与使用诸如压电和形状记忆合金的主动材料的自适应结构相反，MSE系统的自适应状态是被动的，并且仅需要致动以在稳定状态之间移动。 由于专注于能量系统的无源和非耗散方面，MSE系统的影响在于改善系统在操作范围，精度，可靠性和能源效率方面的性能。该研究的方法是合成MSE系统的特定工程任务，如设计设备具有特定的稳定的几何配置和/或在每个平衡位置的自然频率。 虽然已经做了一些分析，对一些可重构结构，这项研究的意义是在提供洞察MSE设计过程中，通过创建一个综合的，而不是分析的方法，更一般的一类系统。MSE装置的一些应用领域是其中单个操作点限制系统效率、致动器特性抑制大范围适应性以及其中耗散效应最小化是重要的那些领域。当与磁致动相结合时，完全顺应的结构导致平滑的非线性系统，其适于精确建模。它们还具有超高的精度和可重复性，以及无磨损运行带来的长系统寿命。当按比例缩小到微系统域时，这样的系统也具有若干优点。所提出的研究结果应具有广泛的影响，多状态精密机械系统，自适应传感器，被动人体增强系统和自适应结构的设计和分析。