EXPERIMENTAL AND ANALYTICAL POWER-FLOW IN BEAMS USING A SCANNING LASER-DOPPLER VIBROMETER

An experimental spatial power-flow (ESPF) method is presented. This me thod provides a spatially continuous model of the power-flow vector fi eld derived from experimental measurements. The power-flow vector fiel d clearly indicates locations of energy sources and sinks as well as p aths of energy transmission. In the ESPF approach, a scanning laser Do ppler vibrometer acquires spatially dense measurements of the vibratin g test structure. These measurements are used in solving for a spatial ly continuous 3-dimensional complex-valued model of the steady-state d ynamic response. From this experimentally derived dynamics model, a sp atial representation of the power flow is computed. (C) 1996 John Wile y & Sons, Inc.