Patent ID: 6763310
Filing Date: 2004-07-13
Classification: G01M

Abstract:
A modal analysis method for determining dynamic vibration characteristics of a structure under acoustic excitation, said method comprising the steps of:providing m complementary sets of correlated input acoustic pressure-related data in the frequency domain representing m complementary acoustic excitation signals, all said sets of data being provided according to n spatially distributed locations associated with the structure with m&gE;n, each said set including reference input acoustic pressure-related data provided according to a reference one of said locations; providing m corresponding complementary sets of output vibration data in the frequency domain in response to said acoustic excitation at a reference point on the excited structure corresponding to the reference location; providing m corresponding complementary sets of n input transfer functions characterizing the correlation between each said set of input acoustic pressure-related data and the reference input acoustic pressure-related data; obtaining n structural transfer functions characterizing each said set of input acoustic pressure-related data from relations between said m sets of n input transfer functions and said m sets of output vibration response data; and deriving from the structural transfer functions the dynamic vibratory characteristics of the acoustically excited structure.