2-CHANNEL LASER VIBROMETER TECHNIQUES FOR VIBRATIONAL INTENSITY MEASUREMENTS .2. LONGITUDINAL INTENSITY

This paper extends the application of a two-channel vibrometer techniq ue from the measurement of flexural energy flow (detailed in Part I) t o the measurement of longitudinal energy flow. The two-channel longitu dinal energy flow equations and two one-dimensional validation methods are presented along with a discussion of how laser vibrometry functio ns for the measurement of in-plane vibratory motion. Adaptations of th e energy flow equations to laser vibrometry are also presented. Experi mental results are illustrated which contain the influence of a bendin g-induced longitudinal component of motion. Through a mathematical mod el, the measurement of the longitudinal energy flow is shown to be acc urate if the influence of bending-induced longitudinal motion is remov ed.