Accession Number : ADA017060

Title :   Nonlinear Theory for a Thin-Walled Piezoelectric Ceramic Ring Excited in the Radial Breathing Mode.

Descriptive Note : Technical rept.,

Corporate Author : NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CONN NEW LONDON LAB

Personal Author(s) : Dunham,Russell W.

Report Date : 03 SEP 1975

Pagination or Media Count : 44

Abstract : The nonlinear differential equation governing a thin-walled piezoelectric ceramic ring excited in the radial breathing mode is derived from the field equation of motion for an elastic continuum, the expanded nonlinear constitutive equations, and the appropriate boundary conditions on the stress. A somewhat pedagogic development of fundamental analytic concepts, such as tensors, tensor manipulations, and coordinate systems, is first presented to fix these necessary concepts clearly in mind. The elastic field equation is derived from basic concepts, and the general definition of strain is presented. The appropriate coordinate transformations, from spatially fixed Cartesian to materially embedded cylindrical, are demonstrated. Then the explicit nonlinear differential equation is derived to the next higher order from linear. It was assumed that the elastic nonlinearities were separable because of the typically high Q's (approximately 1000) for the suspended rings dealt with. A perturbation solution is presented displaying analytically the dependence of the second harmonic on the nonlinear elastic parameters. In the concluding comments suggestions are made as to how the elastic and electrical nonlinear parameters might be measured.

Descriptors :   *Piezoelectric materials, *Ceramic materials, *Rings, Radial stress, Nonlinear differential equations, Elastic properties, Tensors, Equations of motion, Boundary value problems, Electrical properties, Strain(Mechanics), Perturbation theory, Matrices(Mathematics), Numerical integration

Subject Categories : Electrical and Electronic Equipment
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE