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Browsing Conference Publications by Subject "1-3 piezocomposite"
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Item Analysis of a new unidimensional model and lateral vibrations of 1-3 piezocomposite side scan sonar array(SACAM 2006, 2006-01) Shatalov, MY; Fedotov, I; Wallis, JR; Nicolaides, KEA novel unidimensional model of 1-3 piezocomposite ultrasonic transducers is presented. A new electromechanical model is the generalization of the Smith-Auld unidimentional model, which is formulated in terms of a variational approach. It takes into account the lateral motions of the piezoelectric pillars and polymer, which are supposed to be proportional to the strain in the axial direction. A new set of equivalent elastic, electrical and electromechanical constants of 1-3 piezocomposite is derived. Lamb modes of the 1-3 piezocomposites are investigated in term of the Certon-Patat membrane model by means of direct variational method application. A new design of a 1-3 piezocomposite side scan SONAR array is considered. An implementation of the array is proposed with generation of acoustic beam patterns at three different frequencies: 80 kHz, 300 kHz and 510 kHzItem Effect of backing material on the transmitting response level and bandwidth of a wideband underwater transmitting transducer using 1-3 piezocomposite(2009-01) Nicolaides, K; Nortman, LP; Tapson, JIncreasing operating depths of autonomous underwater vehicles have necessitated the development of underwater transducers that can operate at a greater depth. This paper investigates the possibility of incorporating rigid backing material into the transducer design to increase its stiffness and depth capability without adversely affecting its wide bandwidth and high transmitting levels. The transducer design under consideration uses 1-3 piezocomposite material, matching layer, coupling layer, stiff backing material (backing plates) and operates at 300 kHz with 200 kHz 6dB bandwidthItem Modelling and implementation of 1-3 piezocomposite side scan sonar array(2005-06) Shatalov, MY; Wallis, JR; Nicolaides, KEA design and implementation of a 1-3 piezocomposite side scan transmit sonar array is considered. The theoretical approach to the array design is based on a new concept of one-dimensional modelling of 1-3 piezocomposite transducers, developed by the authors. This concept corresponds to the generalization of the Smith-Auld one-dimensional model and takes into consideration lateral motions of the piezoelectric pillars and polymer, which are supposed to be proportional to the strain in the axial direction. The main advance of the approach is that the electromechanical model is formulated in terms of variational approach. A new set of equivalent elastic, electrical and electromechanical constants of 1-3 piezocomposite is derived. Lamb modes of the 1-3 piezocomposites are investigated in term of the Certon-Patat membrane model by means of direct variational method application. The implementation of the array is proposed with generation of acoustic beam patterns at three different frequencies: 80 kHz, 300 kHz and 510 kHz. It is shown that the experimental data are in good agreement with the theoretical predictions