Continuous Piezoelectric Health Monitoring Systems Based on Ultrasonic Guided Waves

这项提案将使用2009年《美国复苏和再投资法案》(公法111-5)提供的资金授予，并符合2009年3月20日题为《确保负责任地使用复苏法案资金》的白宫备忘录第2节规定的要求。作为认知项目官员，我还确认，该提案不支持《复苏法案》A分部第1604节所述的项目。连续梳状换能器将产生用于板壳结构健康监测的超声导波。基于波动力学原理的理论驱动方法，将被用来研究和设计带状传感器网络。纤维压电复合材料将被考虑作为梳状元件，广泛地扩展了这些元件的设计空间，除了包括电极的尺寸、结构和位置/尺寸之外，还包括纤维取向和体积分数。将对这些创新传感器设计的压电和机械材料特性进行研究。该系统将能够根据需要使用Lamb波进行主动询问，以及以低功率被动监控声发射。项目进度和成果将与结构健康监测英才中心分享。该中心架起了学术界、政府和产业界的桥梁，旨在促进卫生保健和技术转让方面的最新水平。调查人员将接触初中生和高中生，特别是年轻女性和代表性不足的群体。研究生将有机会在空军研究实验室和一个小企业实体工作。

This proposal will be awarded using funds made available by the American Recovery and Reinvestment Act of 2009 (Public Law 111-5), and meets the requirements established in Section 2 of the White House Memorandum entitled, Ensuring Responsible Spending of Recovery Act Funds, dated March 20, 2009. I also affirm, as the cognizant Program Officer, that the proposal does not support projects described in Section 1604 of Division A of the Recovery Act. Continuous comb transducer strips will generate ultrasonic guided waves for structural health monitoring (SHM) of plate and shell structures. A theoretically driven approach, based on the application of wave mechanics principles, will be used to research and design a network of strip sensors. Fibrous piezoelectric composites will be considered for the comb elements, widely expanding the design space of these elements to include fiber orientation and volume fraction in addition to size, configuration, and location/size of the electrodes. Piezoelectric and mechanical material properties for these innovative sensor designs will be researched. The system will be capable of active interrogation with Lamb waves upon demand, as well as passive monitoring of acoustic emissions with low power. Project progress and results will be shared with the Center of Excellence in Structural Health Monitoring. The center bridges academia, government, and industry and aims to advance the state of the art in SHM and transfer technology. The investigators will outreach to middle school and high school students, especially targeting young women and underrepresented groups. The graduate students will have the opportunity to work with the Air Force Research Laboratory and a small business entity.