WAVE-PROPAGATION IN A PYROELECTRIC CYLINDER OF INNER AND OUTER ARBITRARY SHAPE

The wave propagation in a long pyroelectric cylinder of crystal class 6 with inner and outer irregular shape is considered. The frequency eq uation has been derived for the traction free, earth connected, and th ermally insulated surfaces. The boundary conditions at the arbitrarily shaped boundaries are satisfied using the Fourier series expansion co llocation method. The longitudinal and flexural vibrations of barium t itanate ceramic, which belongs to the (6 mm) class, have been analyzed numerically. The numerical results in the case of elliptical and card ioidal cross sections with an elliptical cavity are tabulated and are presented graphically. (C) 1997 Acoustical Society of America.