Anthony J. Romano
Earl G. Williams
Charles G. DelVecchio
Naval Res. Lab., Code 7132, Washington, DC 20375-5000
An overview of the methods for determining structural intensity from information obtained using near-field acoustical holography (NAH) is presented. Toward these ends, a presentation of the theoretical basis and practical methodologies involved in NAH is given, as well as a brief restatement of the structural intensity formulation appropriate for thin shells and plates. A method for obtaining the unknown displacement and stress components from a knowledge of surface pressure and normal velocity is discussed, and these methods are applied to experimental data obtained for the particular cases of a point-driven, fluid-loaded rectangular plate and cylindrical shell. A movie will be presented which displays the instantaneous structural intensity corresponding to the situations previously outlined. [sup a)]Also at Sachs/Freeman Associates, Inc., 1401 McCormick Dr., Landover, MD 20785.