基于多球域波叠加法的PNAH的虚源配置研究

The Virtual Source about Patch Near-field Acoustic Holography Based on Wave Superposition Approach of Multiple Ball fields by Gravity Method

阐述了基于多球域波叠加法的局部近场声全息声场重建原理,在此理论的基础上,采用重心法用于不规则振动体的多球形虚拟源强配置研究,并根据灰度重心法将多球形虚拟源分为质心球虚拟源强和非质心球虚拟源强两类。并在加入高斯白噪声情况下,运用L-曲线和Tikhonov正则化相结合的方法进行声场重建,通过计算和仿真证明了该方法的有效性。

The principle of sound field reconstruction about Patch Near-field Acoustic Holography based on Wave Superposition Approach of multiple ball fields is explained in detail. Based on this theory,the virtual source of multiple ball fields for irregular oscillating body by gravity method is investigated. According to the grayscale gravity method,the virtual sources of multiple ball fields are divided into centroid ball and non-centroid ball. Under the condition of adding Gaussian white noise,sound field reconstruction adopts the method integrating L-curve by Tikhonov regularization method. Through theoretical analysis and numerical simulation,the proposed method availability is testified.