Farfield analysis of noise sources
First Claim
1. A method for diagnosing a noise source including the steps of:
- a) modeling the noise source strength in terms of a distribution of plurality of virtual spherical wave sources conformal to a source boundary from the inside, but not on the source boundary;
b) measuring sound at a plurality of points external to the source boundary; and
c) reconstructing sound field on the source boundary surface other than the plurality of points based upon said steps a) and b).
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Abstract
An algorithm diagnoses the noise source strength distribution on an arbitrarily shaped object based on acoustic pressures measured in the far field, known as FANS. FANS enable one to acquire a quick estimate of the acoustic pressure at locations that are off limit to traditional measurement microphones. Generally, in the method of the present invention, the noise source is modeled in terms a plurality of virtual spherical wave sources distributed on an auxiliary surface conformal to a source boundary from the inside, but not on the source boundary itself. Sound is then measured at a plurality of measurement points external to the source boundary. The sound field is reconstructed on the source boundary surface itself.
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Citations
17 Claims
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1. A method for diagnosing a noise source including the steps of:
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a) modeling the noise source strength in terms of a distribution of plurality of virtual spherical wave sources conformal to a source boundary from the inside, but not on the source boundary;
b) measuring sound at a plurality of points external to the source boundary; and
c) reconstructing sound field on the source boundary surface other than the plurality of points based upon said steps a) and b). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for diagnosing a noise source comprising:
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a plurality of virtual spherical wave noise sources;
a plurality of transducers for measuring sound at a plurality of measurement points; and
a computer diagnosing the noise source based upon the sound measured at the plurality of measurement points and the based upon the virtual spherical wave noise sources. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification