非规则结构表面多声源近场声全息方法

发布时间：2018-02-04 00:59

本文关键词： 多声源声场球面波叠加声源深度识别近场声全息　出处：《仪器仪表学报》2017年05期 　论文类型：期刊论文

【摘要】：为了提高非规则结构表面多声源声场的全息精度,提出基于目标深度识别与球面波叠加逼近的非规则表面多声源近场声全息方法。该方法使用声源空间深度识别理论,确定结构体上各声源的空间位置,在各声源处分别使用球面波的叠加描述空间声场分布,然后结合现有单原点球面波叠加近场声全息法重构声场。为了验证方法的可行性,首先使用所述方法和现有单原点球面波叠加声全息法,分别对径向脉动球与横向振动球组成的不同声场进行全息重构。结果表明,当声源集聚分布时,所述方法与现有方法均能有效全息重构声压分布,重构误差在5%以下;当声源离散分布时,现有方法失效,所述方法能够较准确地给出重构面的声压分布,主要频段内的全息重构误差小于20%。进一步的对比实验表明,在全息重构多扬声器非规则空间分布声场时,使用所述全息方法的重构误差平均下降14.08%,显著提升了多声源非规则空间分布声场的全息精度。
[Abstract]:In order to improve the holographic accuracy of multi-source sound field on irregular structure surface. Based on target depth recognition and spherical wave superposition approximation, a non-regular surface multi-source near-field acoustic holography method is proposed, in which the spatial location of each sound source on the structure is determined by using the theory of acoustic source spatial depth recognition. The superposition of spherical waves is used to describe the spatial sound field distribution at each sound source, and then combined with the existing single-origin spherical wave superposition near-field acoustic holography method to reconstruct the sound field, in order to verify the feasibility of the method. Firstly, the holographic reconstruction of different acoustic fields composed of radial pulsating sphere and transverse vibration sphere is carried out by using the method and the existing single-origin spherical wave superposition acoustic holography method. The results show that when the sound source accumulates and distributes, the holographic reconstruction is carried out respectively. Both the method and the existing method can effectively reconstruct the sound pressure distribution, and the reconstruction error is less than 5%. When the sound source is dispersed, the existing methods fail, and the method can give the sound pressure distribution of the reconstructed surface more accurately, and the holographic reconstruction error in the main frequency band is less than 20. In the process of holographic reconstruction of irregular spatial distribution of multi-loudspeaker, the reconstruction error of the holographic method is reduced by 14.08 on average, which improves the holographic accuracy of the multi-source non-regular spatial distribution of sound field.
【作者单位】：嘉兴学院机电工程学院;嘉兴嘉嘉汽车零部件制造有限公司;
【基金】：浙江省自然科学基金(Y1110313、LQ17E050010) 浙江省公益性技术项目(2016C31051) 嘉兴市科技计划项目(2016AY13003)资助
【分类号】：O42
【正文快照】： 1引言近场声全息方法(near-field acoustic holography,NAH)最初由文献[1]提出,该方法以空间Fourier变换为基本原理,可以实现高精度的三维声场各声学量的重构[2-3]。但是,基于空间傅里叶变换的NAH要求全息测量面必须为规则的平面、柱面或球面,限制了其工业应用范围[4]。于是,

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