Vibrations and Nonlinear Dynamics of Microcantilevers Interacting with Nanoscale Structures: Applications to Atomic Force Microscopy

基于梯度的智能聚合物传感器和执行器的建模和开发皮俄亥俄州立大学格雷戈里·华盛顿提案#0102310摘要本研究的目标是开发一种新型的基于梯度的传感器，用于分布式系统的空间测量。本研究中的传感器和执行器是以聚偏氟乙烯(PVDF)为原料开发的。以前的研究已经使用空间孔径阴影技术(空间变化的电极来实现特定的性能函数)来测量无数的分布式系统。空间孔径阴影技术的一个主要局限性是，在大多数情况下，孔径严重依赖于一维变化。在这项研究中，空间梯度偏振和孔径遮挡技术被用来开发下一代传感器。在空间极化中，材料以一种允许其压电常数以受控方式变化的方式极化。具体地说，本研究的目的是：(1)发展空间梯度极化的分析基础。该研究的这一部分所固有的是各种结构配置的解析计算权重函数的技术的发展。(2)开发制作空间极化传感器和执行器所需的实验硬件和设施。(3)开发生产用户定义的薄膜致动器和传感器所需的控制技术。(4)开发了一种用于挠度验证的非接触测量技术。研究目标是通过将微积分、力学原理和压电聚合物模型应用于给定的传感器系统来实现的。将开发的偏振薄膜的实验硬件包括电晕充电系统，该系统具有适当的拉伸和驱动机制，以正确放置和光栅化薄膜。类似于粒子跟踪应用中使用的广角立体摄影测量系统将进行改进，以在启动时准确测量分布式系统的位置。传感器市场是一个价值180亿美元的市场，而且还在增长。这些新型传感器可用于一系列应用，包括汽车、生物医学传感器、航空航天结构和军事应用中的碰撞传感器，如声纳传感设备等。此外，这一新技术也有可能直接应用于压电陶瓷驱动器。

Modeling and Development of Gradient Based Smart Polymer Sensors and ActuatorsGregory Washington, PI Ohio State UniversityProposal # 0102310AbstractThe goal of this study is to develop a novel gradient-based sensor for spatial measurement of distributed systems. The sensors and actuators in this study are developed from polyvinylidene fluoride (PVDF). Previous studies have used spatial aperture shading techniques (spatially varying electrodes to achieve a particular performance function) to measure a myriad of distributed systems. A major limitation of the spatial aperture shading techniques was that the apertures have a heavy dependence on 1-dimensional variation for most cases. In this study spatial gradient polarization and aperture shading techniques are used to develop the next generation of sensors. In spatial polarization the material is polarized in a manner such that its piezoelectric constant is allowed to vary in controlled manner. Specifically, the objectives of this research are to: (1) Develop the analytical basis for spatial gradient polarization. Inherent in this part of the study is the development of techniques for analytically calculating weighting functions for various structural configurations. (2) Develop the experimental hardware and facilities necessary for making spatially polarized sensors and actuators. (3) Develop control techniques necessary for the production of user defined film actuators and sensors. (4) Develop a non-contact measurement technique for deflection verification. The research goals are accomplished by applying differential calculus, the principles of mechanics, and piezoelectric polymer modeling to a given sensor system. The experimental hardware that will be developed for polarizing the films consist of a corona charging system with an appropriate stretch and drive mechanism for correct placement and rastering of the film. A wide-angle stereo-photogrammetry system similar to those used in particle tracking applications will be modified to accurately measure the location of the distributed system when actuated. The sensors market is an $18 billion market and growing. These new sensors can be utilized in a host of applications including Automotive, Biomedical sensors, Aerospace Structural, and Impact sensors in Military applications, like sonar sensing equipment and so on. In addition, there is a possibility that this novel technology can be applied directly to piezoceramic actuators as well.