Orr, L. and Mulholland, A.J. and O'Leary, R.L. and Parr, A.C.S. and Pethrick, R.A. and Hayward, G. (2007) Theoretical modelling of frequency dependent elastic loss in composite piezoelectric Transducers. Ultrasonics, 47 (1). pp. 130137. ISSN 0041624X

PDF (orr_2007_ultrasonics(theoretical_modelling_of).pdf)
orr_2007_ultrasonics(theoretical_modelling_of).pdf Download (419kB)  Preview 
Abstract
The large number of degrees of freedom in the design of piezoelectric transducers requires a theoretical model that is computationally efficient so that a large number of iterations can be performed in the design optimisation. The materials used are often lossy, and indeed loss can be used to enhance the operational characteristics of these designs. Motivated by these needs, this paper extends the onedimensional linear systems model to incorporate frequency dependent elastic loss. The reception sensitivity, electrical impedance and electromechanical coupling coefficient of a 13 composite transducer, with frequency dependent loss in the polymer filler, are investigated. By plotting these operating characteristics as a function of the volume fraction of piezoelectric ceramic an optimum design is obtained. A device with a nonstandard, high shear attenuation polymer is also simulated and this leads to an increase in the electromechanical coupling coefficient. A comparison with finite element simulations is then performed. This shows that the two methods are in reasonable agreement in their electrical impedance profiles in all the cases considered. The plots are almost identical away from the main resonant peak where the frequency location of the peaks are comparable but there is in some cases a 20% discrepancy in the magnitude of the peak value and in its bandwidth. The finite element model also shows that the use of a high shear attenuation polymer filler damps out the unwanted, low frequency modes whilst maintaining a reasonable impedance magnitude.
Item type:  Article 

ID code:  9181 
Keywords:  Anisotropic composites, Ultrasonic transducer, Elastic loss, Technology (General), Science (General), Mathematics, Acoustics and Ultrasonics 
Subjects:  Technology > Technology (General) Science > Science (General) Science > Mathematics 
Department:  Faculty of Science > Mathematics and Statistics > Mathematics Faculty of Science > Mathematics and Statistics Faculty of Engineering > Electronic and Electrical Engineering Faculty of Science > Pure and Applied Chemistry 
Depositing user:  Strathprints Administrator 
Date Deposited:  02 Dec 2009 16:31 
Last modified:  27 Jan 2016 20:11 
Related URLs:  
URI:  http://strathprints.strath.ac.uk/id/eprint/9181 
Actions (login required)
View Item 