Abstract
A method to reconstruct the acoustic far-field using a semi-circular sensor array is proposed. Firstly, the pressures in the acoustic far-field are measured by a semi-circular sensor array; then, the acoustic far-field is reconstructed based on the theory of acoustic radiation modes. The numerical simulations for reconstructing the acoustic far-field of a baffled rectangular plate are conducted. The results show that the acoustic far-field of the baffled rectangular plate can be reconstructed accurately by a few sensors on the semi-circular array. The influence of noise to the reconstruction of acoustic field is analyzed, and the robustness of the proposed method is proved. This paper provides a method for the reconstruction of acoustic far-field through a simple measuring array. The method can be applied to the acoustic field reconstruction of large structures, and has good engineering application prospects.
Highlights
In recent years, the acoustic field reconstruction technique based on near-field measurement has been widely used [1,2,3,4,5,6,7]
This paper proposes an acoustic far-field reconstruction method using a semi-circular sensor array
The pressures in the acoustic far-field are measured by a semi-circular sensor array; the acoustic far-field is reconstructed based on the theory of acoustic radiation modes
Summary
The acoustic field reconstruction technique based on near-field measurement has been widely used [1,2,3,4,5,6,7]. Near-field measurement can capture evanescent wave signals, so the acoustic reconstruction based on near-field measurement has great advantages in the identification and localization of noise sources. Jiang Zhe proposed using acoustic radiation modes to reconstruct the acoustic field [8]. Yang Dongsheng has made some applications of acoustic radiation modes to reconstruct the acoustic field of a spherical source [9]. In the arrangement of the far field measuring points, the two Researchers adopt the way of arranging the measuring points evenly on the spherical surface The advantage of this method of measuring points is to ensure the accuracy of the reconstruction results, but for engineering largescale structure, this method of measurement is very difficult to implement. The far-field of sound sources is reconstructed by theory of acoustic radiation modes. The stability of the method is studied when noise is added to the sound pressures at the measuring points
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