Continuous Piezoelectric Health Monitoring Systems Based on Ultrasonic Guided Waves

该提案将使用2009年美国复苏和再投资法案（公法111-5）提供的资金进行奖励，并符合2009年3月20日白宫备忘录第2节中规定的要求，该备忘录题为“确保复苏法案资金的负责任支出”。我还确认，作为认知项目官员，该提案不支持《恢复法》A部分第1604节所述的项目。连续梳状换能器条将产生用于板壳结构健康监测的超声导波。 一个理论驱动的方法，应用波动力学原理的基础上，将被用来研究和设计一个网络的条形传感器。纤维压电复合材料将被认为是梳状元件，广泛扩展这些元件的设计空间，包括纤维取向和体积分数，除了尺寸，配置和位置/尺寸的电极。将研究这些创新传感器设计的压电和机械材料特性。该系统将能够根据需要主动询问兰姆波，以及被动监测低功率的声发射。项目进展和成果将与结构健康监测卓越中心分享。该中心是学术界、政府和工业界的桥梁，旨在推进SHM和技术转让的最新发展。调查人员将接触初中和高中学生，特别是针对年轻妇女和代表性不足的群体。研究生将有机会与空军研究实验室和小企业实体合作。

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.