Accession Number : ADA301131

Title :   The Estimation of Material and Patch Parameters in a PDE-Based Circular Plate Model.

Descriptive Note : Contract rept.,

Corporate Author : INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA

Personal Author(s) : Banks, H. T. ; Smith, Ralph C. ; Brown, D. E. ; Metcalf, Vern L. ; Silicox, R. J.

PDF Url : ADA301131

Report Date : SEP 1995

Pagination or Media Count : 29

Abstract : The estimation of material and patch parameters for a system involving a circular plate, to which piezoceramic patches are bonded, is considered. A partial differential equation (PDE) model for the thin circular plate is used with the passive and active contributions from the patches included in the internal and external bending moments. This model contains piecewise constant parameters describing the density, flexural rigidity Poisson ratio and Kelvin-Voigt damping for the system as well as patch constants and a coefficient for viscous air damping. Examples demonstrating the estimation of these parameters with experimental acceleration data and a variety of inputs to the experimental plate are presented. By using a physically derived PDE model to describe the system, parameter sets consistent across experiments are obtained, even when phenomena such as damping due to electric circuits affect the system dynamics.

Descriptors :   *VIBRATION, *ELECTRICAL MEASUREMENT, *PIEZOELECTRIC GAGES, EXPERIMENTAL DATA, DYNAMICS, PARAMETERS, DAMPING, PASSIVE SYSTEMS, ESTIMATES, CERAMIC MATERIALS, COEFFICIENTS, PARTIAL DIFFERENTIAL EQUATIONS, RIGIDITY, FLEXURAL PROPERTIES, POISSON RATIO, BENDING MOMENTS.

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE