Reconstruction of transient acoustic radiation from a finite object subject to arbitrarily time-dependent excitation
First Claim
1. A method for reconstructing transient acoustic radiation from an object including the steps of:
- a) measuring transient acoustic pressure at a plurality of measurement points around the object subject to an arbitrarily time-dependent excitation; and
b) reconstructing the transient acoustic pressure at points other than the measurement points based upon the measurements at the plurality of measurement points.
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Abstract
General algorithms are developed for reconstructing the acoustic field generated by an arbitrary object subject to an arbitrarily time-dependent excitation. These algorithms enable one to visualize a time-domain acoustic pressure wave as it travels through three-dimensional space. Such a tool can be used to diagnose general noise sources and transmission since in engineering applications most structures are subject to arbitrarily time-dependent excitations. To facilitate the derivations of the temporal solutions, we make use of Laplace transform and expand the acoustic pressure in terms of the spherical Hankel functions and the spherical harmonics. The expansion coefficients are settled by solving an over-determined system of equations obtained by matching the assumed-form solutions to the measured acoustic pressures. To obtain a general expression for a temporal kernel, we replace the spherical Hankel functions by polynomials in s, recast the infinite integral in the inverse Laplace transform as a contour integral in the complex s-plane, and evaluate it via residue theorem. Once this is done, the transient acoustic quantities anywhere including a source surface can be obtained by convoluting the temporal kernels with respect to measured acoustic pressures.
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Citations
18 Claims
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1. A method for reconstructing transient acoustic radiation from an object including the steps of:
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a) measuring transient acoustic pressure at a plurality of measurement points around the object subject to an arbitrarily time-dependent excitation; and b) reconstructing the transient acoustic pressure at points other than the measurement points based upon the measurements at the plurality of measurement points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for reconstructing an acoustic field comprising:
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a plurality of transducers each measuring acoustic pressure at a measurement point around a noise source generating transient acoustic radiation; and a computer reconstructing transient acoustic pressure at points other than the measurement points based upon the acoustic pressure as measured by the transducers. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A computer-readable storage medium having a computer program stored thereon, which when executed by a computer performs the steps of:
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a) receiving signals indicating sound at a plurality of measurement points around a noise source generating transient acoustic radiation; and b) reconstructing a transient acoustic field at points other than the measurement points based upon the signals.
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18. A system for reconstructing an acoustic field comprising:
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a plurality of transducers each measuring acoustic pressure at a measurement point around a noise source generating transient acoustic radiation; and means for reconstructing transient acoustic pressure at points other than the measurement points based upon the acoustic pressure as measured by the transducers.
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Specification