### ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

## 2pEA4. The effects of multilayering piezoelectric plates with implication
to 1--3 piezocomposite materials.

**David J. Powell
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*Dept. of Ocean Eng., Florida Atlantic Univ., Boca Raton, FL 33431
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**Thomas R. Howarth
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Robert Y. Ting
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*Naval Res. Lab., Orlando, FL 32856-8337
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This paper discusses the considerations of stacking piezoelectric plates
mechanically in series (on top of each other) and electrically in parallel or
series. Benefits include increased displacement for projectors and increased
signal-to-noise ratio (SNR) for hydrophones (because of self-shielding and
decreased electrical impedance). The presentation will show why these
enhancements are realized by using a mathematical solution of the
one-dimensional (1-D) wave equation to describe how each layer is related to
that in adjacent layers via continuity of particle displacement and force. The
resultant set of simultaneous equations is solved using matrix manipulation
algorithms over a specified frequency range in terms of the free-field voltage
sensitivity (FFVS), transmitting voltage response (TVR), and electrical
immitance characteristics. A temporal transient response is obtained through
the inverse fast Fourier transform (IFFT). This computational efficient model
is capable of piezoceramic or 1--3 piezocomposite transducer layers, as well as
inactive layers. The 1--3 piezocomposites are input by using the Smith
expressions for representing the piezocomposite as a homogeneous material.
Application of 1--3 piezocomposites for multiple layering will be introduced
and discussed. [Work sponsored by the Office of Naval Research.]