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Advanced sensing and actuation techniques using Piezoelectric polymer materials

Bray, Brian Christopher
http://rave.ohiolink.edu/etdc/view?acc_num=osu1406640736

Abstract Details

2003, Master of Science, Ohio State University, Mechanical Engineering.
The goals of this research are to investigate the use of spatially shaded piezoelectric materials as a positional impact sensor, a torsion actuator to create twist on a beam, and as a multiple point strain sensor used to calculate displacement. These goals are accomplished by applying Newtons laws, composite material theory, and the linear piezoelectric constitutive relationships to develop analytical expressions that account for charge collection and produced strain based on the electrode shape. A piezoelectric polymer film, Polyvinylidene Fluoride (PVDF), was used for experimental testing, and spatial shading was achieved through the removal of electrode material. The impact sensor was designed to have two electrodes that vary linearly over the length of the sensor. The electrodes act as weighting functions and for a normal stress applied to the sensor on the left side, one of the electrodes will collect almost all the electrical charge, and as the normal stress is moved to the right the amount of electrical charge collected will decrease linearly to almost no charge collected on the far right side of the sensor, and vice versa for the other electrode. This means that the impact location can be directly related to the measured output voltage from each electrode. The design of a torsion actuator was investigated by modeling the resultant forces and moments based on the electrode pattern. In addition, the piezoelectric constants of PVDF are not isotropic and therefore the orientation of the film will affect the resultant forces and moments and is included in the analysis. The multiple point strain sensor was shaped to allow measurements at multiple discrete locations across the span of the structure. This sensor is mounted on a beam and the displacement of the beam is calculated for mode one and mode two vibration. Currently, strain gage sensors are used to measure strain, and each strain gage requires dedicated signal conditioning equipment, which can be costly when many strain gages are needed. Using spatially shaded piezoelectric film would greatly reduce the amount of equipment needed to achieve the same measurement.
Gregory N. Washington (Advisor)
Marcelo J. Dapino (Committee Member)
127 p.
Mechanical Engineering

Recommended Citations

Citations

  • Bray, B. C. (2003). Advanced sensing and actuation techniques using Piezoelectric polymer materials [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406640736

    APA Style (7th edition)

  • Bray, Brian. Advanced sensing and actuation techniques using Piezoelectric polymer materials. 2003. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1406640736.

    MLA Style (8th edition)

  • Bray, Brian. "Advanced sensing and actuation techniques using Piezoelectric polymer materials." Master's thesis, Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406640736

    Chicago Manual of Style (17th edition)

osu1406640736
141
© 2003, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.