强干扰环境下双面Patch近场声全息技术

Double-layer Patch Near-field Acoustic Holography under Strong Interference Environment

针对目标声源在强干扰环境下进行声场重建易受到干扰源、散射效应影响及测量孔径效应的双重问题,提出强干扰声场环境下基于声辐射模态声场分离算法的双面Patch近场声全息技术.通过理论分析和公式推导,建立了基于声辐射模态声场分离算法的内插外推数学模型,不仅清除干扰源声场及散射声场的影响,而且减少测量工作量,加快计算速度;数值仿真及实验表明,强干扰环境下忽略散射声场的影响很难重建目标声源的声场,且随着干扰源强度增大分离误差逐渐增大,而利用文中究的理论同时剔除了散射声场及干扰源声场的影响,提高了声场重建的精度,降低了测量成本.

Aiming at the twin problems that sound field reconstruction of the target sound source is easy to be disturbed by the interference sound source,scattering sound field and the measuring aperture effect,the Double-layer Patch near-field acoustic holography based on acoustic field separation algorithm of acoustic radiation modes under strong interference environment is presented.Firstly,the internal difference extrapolation mathematical model based on acoustic field separation algorithm of acoustic radiation modes is established by theoretical analysis and formula deduction.It not only eliminates the influence of the interference sound source and the scattered sound field,but also reduces the workload of the measurement and speeds up the calculation speed.Then the numerical simulation and experimental results verify the theoretical correctness.Numerical simulation and experimental results show that neglecting the influence of the scattered field would make it difficult to reconstruct the sound field of the target source under strong interference environment and the separation error increases with the increase of the intensity of the interference source.By using the theory of this paper,the influence of scattering sound field and the sound field is eliminated,the reconstruction accuracy is improved and the cost is reduced.