An efficient superposition of acoustic field reconstruction in NAH

摘要

Source localization problem in near-field acoustical signals on solids surfaces is one of the computationally challenging tasks. This paper concentrates on a solution to this problem. The modeling of the presence of noises while measuring the acoustic pressure field produced due to the sound sources in the vicinity is done using acoustical holography method. The pressure field produced is modeled mathematically using Rayleigh-Sommerfield Algorithm and Helmholtz integral. Near-field acoustic holography (NAH) is performed using the conventional method termed as Fourier Transform based Acoustical Holography. Mathematically modeled pressure field is super positioned and NAH is used to synthesize the original pressure field. In this paper, we have done a simulation model for localizing acoustical sources on the solid surfaces. A pipelining method is described for super-positioning the truncated pressure field to match the actual measured pressure field. Windowing technique is adopted to address spectral leakage effects and the abnormality is caused to the proximity of the boundaries. The results reveal that the proposed methodology can apply to localize sources on diverse kind of surfaces.