Abstract
The usefulness of determining the noise path of flexural waves by means of cross-correlation techniques is demonstrated. In particular, this paper presents theoretical and experimental results which demonstrate that if the cross-power spectral density function is transformed by use of a Fourier transform in terms of Tf (where T is the time lag and f is the frequency), a near-correlation function is generated, which, when applied to transmission path studies in dispersive media, will have analogous properties to the standard cross-correlation function when applied to nondispersive media. The theoretical results were checked for both single- and multipath cases. The experimental setups consisted of 18 in.×1 in. aluminum beams, which were excited by white noise using an electromagnetic shaker. The response at two points was measured with accelerometers and their output recorded on magnetic tape. This information was digitized and processed on the Univac 1107 computer.
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