Measurement of Power Flow in Uniform Beams and Plates

A novel technique is presented for measuring the vibrational intensity (power flow per unit width of cross section) in uniform plates and beams vibrating in flexure. The intensity is obtained as a vector at a measurement point. Measurements at many points yield the pattern of power flow. Experimental results of intensities in a very reverberant plate illustrate the measurement technique and are consistent with the loss factor of the plate.