Abstract
A theoretical and experimental study on the separation method of the incident sound field based on a small-scale vector sensor is proposed in this study, with the aim of resolving the problem of separation and acquisition of an incident sound field under the interference of near-field sound scattering from a cylindrical shell in water. The method of identifying and separating sound waves obtained under plane wave conditions is extended to complex sound-field conditions. Simulation and experimental results show that the vector separation method can greatly reduce the sound pressure amplitude and the phase deviation of the incident sound field, which is affected by near-field scattering from the cylindrical surface. The separation accuracy is related to the deviation angle and the distance from the target surface. The maximum deviation of the pressure amplitude is less than 1 dB, and the phase deviation is less than 3°. This method can effectively suppress the near-field scattering of the cylindrical shell and improve the separation accuracy of the incident sound field. The research results have reference value for a range of practical engineering applications.
Highlights
The near-field acoustic holography (NAH) method is mainly used to examine the distribution of the sound field and perform the separation of the incident sound field on the surface of the cylindrical shell [7]
When the incident sound field and the axis of the holographic plane are not parallel, the separation of the incident sound field and the scattered sound field was achieved Based on the boundary element method (BEM), the separation method of incident and scattered acoustic fields is studied [9, 10]
Studies on the basis of joint information processing, such as the correlation and directivity of sound pressure and vibration velocity in underwater acoustic fields, have been conducted. ese works identified the coherent interference synthesis problem of energy flow suppression technology [15,16,17]. e effect of scattering by a spherical shell baffle on vector directivity and far-field incident acoustic signal measurement has been theoretically and experimentally studied [18]. e abovementioned literature focuses on the surface of spherical structures. e influence of the sound-field distribution and its scattering on the incident sound field has not been studied for the common distribution of the sound field on the surface of a cylindrical shell, including the precise separation of the incident sound field
Summary
Incident Sound Field Separation on the Surface of a Cylinder. According to the distribution of the incident and backscattered sound fields around the cylinder surface, the coordinate system shown in Figure 5 was established. e plane wave was incident in the x-axis direction towards the origin, the sound pressure and vibration velocity are 180° out of phase, and the horizontal azimuth angle is measured relative to the x-axis. E plane wave was incident in the x-axis direction towards the origin, the sound pressure and vibration velocity are 180° out of phase, and the horizontal azimuth angle is measured relative to the x-axis. Is means the vector beam was rotated in order to ensure that the direction of the unilateral cardioid was consistent with the direction of the incident sound field By using this principle, plane waves in different directions can be obtained. E sound field on the surface of a cylinder is the superposition of a far-field incident plane wave and a near-field scattered wave. As the propagations of the incident and backscattered sound fields are in opposite directions, the joint treatment of sound pressure and vibration velocity forms a unilateral directivity. The separation of the incident sound field under the condition of a complex sound field on the surface of a cylindrical target was analyzed
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