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1 August 2003 Analysis of hybrid PMN/Terfenol broadband transducers in mechanical series configuration
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This paper presents recent advances in the design and characterization of hybrid transducers incorporating magnetostrictive and electrostrictive elements. In order to analyze and validate the properties inherent to hybrid concepts, a transducer was designed and constructed through a mechanical series arrangement of a PMN-PT stack and a Terfenol-D rod. This configuration provides a double resonant frequency response that can be tuned for a variety of applications. The primary objective of this study lies in the determination of the design criteria for achieving maximum transducer bandwidth on the 1 - 6 kHz range. To this end, a linear system model was developed utilizing concepts from vibrations, electroacoustic theory, and linearized constitutive relationships for each class of smart material for low to moderate drive levels. This model provides a means of completely describing the system response and the interactions between electrical and mechanical domains for this hybrid transducer. Experimental data collected from the test device indicate that the measured modes of vibration and resonance peaks agree with the theoretical results, and that the desired bandwidth has been achieved.
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Patrick R. Downey, Marcelo J. Dapino, and Ralph C. Smith "Analysis of hybrid PMN/Terfenol broadband transducers in mechanical series configuration", Proc. SPIE 5049, Smart Structures and Materials 2003: Modeling, Signal Processing, and Control, (1 August 2003);

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