柱面多参考统计最优近场声全息研究

Investigation on cylindrical multi-reference statistically optimized near-field acoustical holography

针对舰艇水下机械噪声源分布集中、相关性强、耦合作用明显等特点,利用柱面多参考统计最优近场声全息,建立舰艇水下机械噪声源的可视化定位技术.该方法集成了多参考点布置、局部声场分解和统计最优近场声全息反演算法等技术.针对该方法,进行了多点相关噪声源定位及多参考点布置等仿真研究,并进行了水下模型的近场声全息试验研究.仿真和试验结果表明:本方法能够实现水下圆柱壳体结构表面噪声源可视化定位,当选择合适的多参考点布置时,例如尽可能地选择靠近且围绕噪声源的多个参考点布置,能够获得最优的声场重构结果.

Cylindrical multi-reference statistically optimized near-field acoustical holography technology was proposed while considering features of the underwater machinery noise sources of naval vessels.These features include concentrative distribution,strong correlation,and marked coupling.The aim was to construct technology which could visually locate the noise sources of underwater machinery.The proposed technology is composed of multi-reference point configuration,partial sound decomposition,and SONAH.To use this technology,numerical simulations were carried out by locating multi-point correlative noise sources and configuring multi-reference points,and a corresponding underwater near-field acoustical holography model experiment was implemented.Results of both the numerical simulations and the experiment show that the proposed technology can visually locate noise sources for underwater cylinder shell structures,and when choosing appropriate multi-reference configuration,e.g.multi-reference points being close to and enclosing the noise source as much as possible,the reconstructed sound field results will be optimized.