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22 June 2000 Modeling and electrode optimization for torsional IDE piezoceramics
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Conventionally electroded surface-bonded piezoceramic elements are incapable of controlling torsional motions because the in- plane isotropic actuation strain is orthogonal to the surface shear strain pattern associated with torsional deformations. For devices with in-plane orthotropic properties, however, such as those with interdigital electrodes (IDE), sensing and controlling torsion is possible, allowing damping by passive or active means. An electromechanical model is developed for orthotropic piezoceramic devices bonded to the surfaces of beams or tubes in torsion; expressions for mechanical compliance, actuator authority, electromechanical coupling, and passively attainable damping for the combined system are derived in terms of geometric and material parameters and orientations. Optimization of the actuator orientation and geometry is addressed, with specific attention to the width, spacing, and angle of interdigital electrodes. Experimentally determined damping ratios are presented for torsional IDE piezoceramic devices with passive shunts, along with considerations for future improvements.
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David J. Warkentin "Modeling and electrode optimization for torsional IDE piezoceramics", Proc. SPIE 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems, (22 June 2000);

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