Research of Modal Sensors and Filters of Piezoelectric Composite Structures
Date Issued
2009
Date
2009
Author(s)
Li, Chih-Hang
Abstract
Piezoelectric modal sensors can be created using the orthogonal property of eigenfunctions. Sensors have been designed for use with 1-D flexural structures by shaping electrode patterns proportional to modal strains. However, it is not easy to apply the same concept to general structures due to the difficulty in implementing the location weight needed for signals. Therefore, a nonlinear optimization scheme is proposed in this paper to design modal filters for general structures. For any given electrode pattern, the signal contributed from each mode is found by integrating the corresponding free surface charges on the sensing electrode. A modal filter is obtained by modifying the electrode pattern to achieve the desired relative signal strength for different modes.ensors capable of capturing or filtering out the signal generated by a specific mode can be developed. A PZT coated aluminum plate is used as an example. Mode shapes are found with finite element analysis. Design of both a mode-pass and mode-reject filter is demonstrated. This method also works for three-dimensional structures, as only free surface charges are involved in the operation of modal filters.
Subjects
Piezoelectric Composite Structures
sensor
filter
optimization
Type
thesis
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