An impact source identification technique for finite isotropic plates using a time-reversal method with associated signal processing algorithms is investigated experimentally. A series of low velocity impact experiments on an aluminum plate is performed to verify this impact identification method using merely four piezoelectric sensors. Validation of the experimental system for impact source id...

This paper addresses modeling of guided-wave excitation by surface-bonded piezoelectric wafer transducers in multi-layered composite plate structures. Each of the individual layers is assumed to have unidirectional fibers in an epoxy matrix and is modeled as being transversely isotropic. The piezoelectric actuators are modeled as causing shear traction along their edges on the plate surface and...

The far-field response of a bi-axially pre-stressed incompressible elastic plate, subjected to an instantaneous edge impulse loading, is studied using a refined long-wave low-frequency theory. The second order correction introduced by the refined theory is demonstrated to smooth the discontinuity associated with one of the wave fronts predicted by the leading order hyperbolic theory. The charac...

This paper presents a method to identify wave equations’ parameters using dispersion characteristics (k-space) on two-dimensional domains. The proposed approach uses the minimization of difference an analytic formulation relation wavenumbers calculated from solution fields. implementation partial differential equations (PDE) resolution finite element software is explained and tested with soluti...

The analysis and estimation of the stress-strain state (SSS) multilayered plates on a rigid foundation under action stationary transverse loading is an urgent task. As its includes calculations strength deformability various homogeneous multilayer coatings. This calculation pavement relatively bridge structures, or non-deformable underlying layer, protective coatings flat elements structures gr...

The change of signature of a metric is explained using simple examples and methods. The Klein-Gordon field on a signature-changing background is discussed, and it is shown how the approach of Dray et al. can be corrected to ensure that the KleinGordon equation holds. Isotropic cosmologies are discussed, and it is shown how the approach of Ellis et al. can be corrected to ensure that the Einstei...

A comparison was made between two approaches to predict acoustic emission waveforms in thin plates. A normal mode solution method for Mindlin plate theory was used to predict the response of the flexural plate mode to a point source, step-function load, applied on the plate surface. The second approach used a dynamic finite element method to model the problem using equations of motion based on ...