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S20 Vibroacústica |
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Title:
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CHARACTERIZATION OF STRUCTURAL VIBROACOUSTICS PROPERTIES USING NEARFIELD ACOUSTIC HOLOGRAPHY
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Summary :
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ABSTRACT. NEARFIELD ACOUSTIC HOLOGRAPHY IS AN ATTRACTIVE WAY TO ANALYZE VIBROACOUSTIC PROBLEMS. HOLOGRAPHY IS A PROCESS THAT ALLOW TO DETERMINE ACOUSTIC FIELD WAVES CHARACTERISTICS USING A DISCRETE FOURIER TRANSFORM, FROM A REGULAR GRID OF MEASUREMENTS OBTAINED IN AN ACOUSTIC ENVIRONMENT FOR WHICH THE GREEN S FUNCTION IS KNOWN. THIS PAPER PRESENTS A BRIEF PRINCIPLE S REVIEW OF THIS TECHNIQUE WITH AN APPLICATION ON RECOVER THE VIBROACOUSTIC PROPERTIES OF A STRUCTURE. IN ORDER TO MINIMIZE SPATIAL LEAKAGE PROBLEM FROM SIGNAL PROCESSING A REGRESSIVE DISCRETE FOURIER SERIES WAS UTILIZED AS AN ALTERNATIVE TO WINDOWING TECHNIQUES. RESULTS OBTAINED FROM A PLATE TYPE STRUCTURE WERE ANALYZED, VALIDATED AND COMPARED WITH THEORETICAL PREDICTIONS.
KEY-WORDS: ACOUSTIC HOLOGRAPHY, NEARFIELD ACOUSTIC HOLOGRAPHY, VIBROACOUSTIC, STRUCTURAL VIBRATIONS.
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Author :
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Colinas, Nilton G.
Dos Santos, Jos?Maria C.
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Paper View :
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COBEM99
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