Quantitative Displacement and Strain Distribution of Vibrating Plate-Like Structures Based on Time Average Holographic Interferometry.

摘要

A technique for computing the bending strain resulting from the resonant modal deformation of a vibrating plate-like structure is described. Interferometric fringes obtained by time-average holography are used as the basis for generating a mathematically continuous series approximation of the structure's out-of-plane displacement. The terms of the series consist of the eigenfunctions of a simple beam having either clamped-free or free-free boundary conditions. Use is made of a linear least squares equation solver to compute the coefficients of the displacement series terms based upon the experimental holographic fringe values. The technique is programmed for use on an interactive computer terminal. The method is tested by comparing it to the results of an eigenvalue analysis of a cantilevered plate analyzed using the finite element computer program, NASTRAN. (Author)