title: Multisource statistically optimized near-field acoustical holography.
abstract: This paper presents a reduced-order approach to near-field acoustical holography (NAH) that allows the user to account for sound fields generated by multiple spatially separated sources. In this method, an equivalent wave model (EWM) of a given field is formulated to include combinations of planar, cylindrical, spherical, or other elementary wave functions in contrast to an EWM restricted to a single separable coordinate system. This can alleviate the need for higher-order functions, reduce the number of measurements, and decrease error. The statistically optimized near-field acoustical holography (SONAH) algorithm is utilized to perform the NAH projection after the formulation of the multisource EWM. The combined process is called multisource statistically optimized near-field acoustical holography (M-SONAH). This method is used to reconstruct simulated sound fields generated by combinations of a vibrating piston in a sphere and linear arrays of monopole sources. It is shown that M-SONAH can reconstruct near-field pressures in multisource environments with lower errors and fewer measurements than a strictly plane or cylindrical-wave formulation using the same simulated measurement.
authors.affiliation: N243 Eyring Science Center, Brigham Young University, Provo, Utah 84602.
authors.forename: Alan T
authors.initials: AT
authors.lastname: Wall
authors.affiliation: N243 Eyring Science Center, Brigham Young University, Provo, Utah 84602.
authors.forename: Kent L
authors.initials: KL
authors.lastname: Gee
authors.affiliation: N243 Eyring Science Center, Brigham Young University, Provo, Utah 84602.
authors.forename: Tracianne B
authors.initials: TB
authors.lastname: Neilsen