Abstract
The measurement of structural intensity using an array of accelerometers, which was proposed in the 1970s, but has not been put to pratical use due to its intrinsic complexity, is examined in this study. A theoretical investigation is performed in this paper. Formulation of the relation between bending wave in structures and structural intensity makes it possible to separate the wave component by which one can get a state of the vibration field. Then, the effect of the nearfield, which is thought to be great in the actual measurement, is examined. Comparison between the simple method by a pair of accelerometers and the strict array method, shows that the measurement error of the pair method is rather big especially in a two-dimensional wave.
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