Ultrafast and Robust, Resettable Threshold Sensors Based on Discontinuity-Induced Nonlinearities

基于不连续引起的非线性的超快、鲁棒、可重置阈值传感器

• 批准号: 0855787
• 负责人: Harry Dankowicz
• 金额: $ 30.2万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-03-15 至 2015-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0855787&HistoricalAwards=false
• 关键词: Ultrafast; Robust; Resettable; Threshold; Sensors

Threshold sensors are input-output devices that switch operating state in reaction to the crossing of a threshold value of their input. These are used to monitor and control critical values of temperature, voltage, pressure, etc. in both consumer and industrial settings. The change in operating state might be permanent, such as when a fuse burns out, or capable of being reset, such as with a circuit breaker. This research effort aims to analyze, design, fabricate, and experimentally characterize a class of ultrafast and robust, resettable electromechanical threshold sensors. The fundamental design principle proposed here relies on predicted changes in system response particular to piecewise-smooth dynamical systems including impact- and friction-like discontinuities. The proposed research will validate these theoretical predictions and demonstrate the successful regulation of switch rates using active feedback control in macro- and microscale electromechanical devices.This research effort makes original contributions to a nascent effort in nonlinear dynamics that will transform the field from a tool for modeling and analysis of observed behavior to a tool of intentional synthesis of engineered systems. The engineering of man-made devices to exhibit desirable nonlinearities has the potential to dramatically broaden the toolbox of the applied engineer and to change the performance characteristics in existing applications by orders of magnitude. The present work is a basic and comprehensive effort to establish the so-called nonsmooth fold bifurcation associated with the onset of low-velocity contact in vibro-impacting systems as an exploitable nonlinear phenomenon in device design, e.g., capacitively-driven circuit protection devices. Preliminary results on the ultrafast response following this bifurcation show a significant potential for dramatic improvement in sensor performance.This research is an international collaboration with research groups at the Royal Institute of Technology in Stockholm, Sweden and at La Sapienza University in Rome, Italy and will include several extended visits of project graduate research assistants to the international sites.

阈值传感器是输入输出设备，可根据输入阈值的变化来切换操作状态。它们用于监测和控制消费和工业环境中温度、电压、压力等的临界值。操作状态的变化可能是永久性的，例如当保险丝烧断时，或者能够重置，例如使用断路器。这项研究工作旨在分析、设计、制造和实验表征一类超快、鲁棒、可重置的机电阈值传感器。这里提出的基本设计原理依赖于系统响应的预测变化，特别是分段平滑动力系统，包括类似冲击和摩擦的不连续性。拟议的研究将验证这些理论预测，并展示在宏观和微观机电设备中使用主动反馈控制成功调节开关速率。这项研究工作为非线性动力学的新生工作做出了原创性贡献，该领域将改变该领域从一个工具对观察到的行为进行建模和分析，以作为有意综合工程系统的工具。表现出理想非线性的人造设备工程有可能极大地拓宽应用工程师的工具箱，并以数量级改变现有应用中的性能特征。目前的工作是一项基础和全面的工作，旨在建立与振动冲击系统中低速接触开始相关的所谓非平滑折叠分岔，作为器件设计中可利用的非线性现象，例如电容驱动电路保护器件。分岔后超快响应的初步结果表明，传感器性能具有显着改善的巨大潜力。这项研究是与瑞典斯德哥尔摩皇家理工学院和意大利罗马拉萨皮恩扎大学研究小组的国际合作，并将包括项目研究生研究助理对国际地点的多次长期访问。