The use of normal mode theory in holographic vibration analysis with application to an asymmetrical circular disk

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Abstract
The theory of normal vibration modes is reviewed for transverse vibrations of two-dimensional structures, and its implications are discussed with respect to vibration analysis that is performed by hologram interferometry and laser speckle interferometry. It is concluded that care should be taken to record vibration interferograms of true vibration modes. Experimental results are shown that illustrate how data taken of true vibration modes can be used to compute vibration patterns that result from mode combinations.