Patent ID: 7509207
Filing Date: 2009-03-24
Classification: G01H,Y10T

Abstract:
1. A method for determining how well configurations for a gas turbine propulsion system attain selected acoustic wave energy emissions criteria, said method comprising: acquiring a noise representation of acoustic energy emissions for a gas turbine propulsion system of an initial configuration over an operating time duration; providing a plurality of unaltered acoustic frequency spectra representations of the noise representation each corresponding to one of a plurality of selected sample times occurring during the operating time duration; evaluating each unaltered acoustic frequency spectrum representation to provide a corresponding noise parameter value for each such spectrum representation to together provide a plurality of noise measurement parameter values corresponding thereto; averaging the plurality of noise measurement parameter values corresponding to each unaltered acoustic frequency spectrum representation to provide an operating parameter noise value corresponding to the unaltered acoustic frequency spectra representations; locating relative peaks in the unaltered acoustic frequency spectra representations and altering forms of at least one of those peaks with respect to acoustic frequency in at least one alteration manner substantially matching acoustic wave energy emissions changes corresponding to a configuration change in gas turbine propulsion systems to thereby form a corresponding altered acoustic frequency spectra representations; evaluating each altered acoustic frequency spectrum representation corresponding to an alteration manner to provide a corresponding noise parameter value for each such spectrum representation to together provide a plurality of noise measurement parameter values corresponding to that alteration manner; averaging the plurality of noise measurement parameter values corresponding to an alteration manner to provide an operating parameter noise value corresponding to that alteration manner; and determining that of the operating parameter noise values best meeting the selected acoustic wave energy emissions criteria to identify the corresponding configuration change, if any, to aid in determining if there should be a configuration change from the initial configuration and what that change should be.