Modal analysis method and apparatus therefor
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United States of America Patent
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Jul 13, 2004
Grant Date -
Dec 5, 2002
app pub date -
May 13, 2002
filing date -
May 14, 2001
priority date (Note) -
Expired
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Abstract
A modal analysis method and apparatus for acoustically determining vibration characteristics of a structure uses a MISO model. An acoustic excitation signal toward spatially distributed locations associated with the structure is generated while the latter is held vibrated, one location being chosen as reference. Complementary sets of input acoustic pressure-related signals are produced, one being a reference signal. Fourier analysis is performed on the input signals to provide correlated input acoustic pressure-related data in frequency domain including reference data. Induced output vibration is sensed at a reference point on the structure corresponding to the reference to produce complementary sets of output vibration signals, which are converted through Fourier analysis into sets of output vibration data in frequency domain. Structural transfer functions characterizing each set of input acoustic pressure-related data are obtained from which vibratory characteristics of the structure are derived.
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