کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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562000 | 875348 | 2009 | 8 صفحه PDF | دانلود رایگان |
Conditioned spectral analysis (CSA) and virtual source analysis (VSA) are two techniques currently used nowadays to post-treat measurements on multiple input multiple output (MIMO) systems. Those techniques are based on the estimation of cross-spectral quantities between outputs and the so-called “references”. In some measurement situations, all outputs cannot be acquired simultaneously, several measurement passes are necessary (using a scanning system, a robot or a laser vibrometer). An approach is proposed in this paper to adapt CSA and VSA to MIMO systems requiring a multi-pass acquisition. The approach is based on the average over all passes of a set of reference channels, and on the correction of cross-spectral quantities by using transfer functions and averaged reference spectra. An academic experiment is finally realized to illustrate the proposed approach.
Journal: Mechanical Systems and Signal Processing - Volume 23, Issue 5, July 2009, Pages 1415–1422