水下大型结构声场全息重建的波叠加方法研究

Investigation on holographic reconstruction of large underwater structures sound field using wave superposition method

文章针对波叠加法相对于边界元法的巨大优越性,将其应用到分析水下大型结构的声场全息重建问题中。根据波叠加方法的近场声全息技术,结合边界元软件SYSNOISE,重建了一80m长的长椭球壳模型在力激励作用下的空间声场。通过理论推导和数值仿真,分析了各因素对重建精度的影响。将波叠加法的计算结果与数值软件计算的结果进行对比,证明了应用波叠加法对其声场进行全息重建的方法是可行有效的,而且计算时间短、效率高、计算精度也完全满足工程需要。进一步拓宽了波叠加法在计算水下结构振动声辐射和声全息问题的应用范围。

The Wave Superposition Method （WSM） is applied to calculate for the acoustic holography and reconstruction problem of large underwater structures because of its great superiority to boundary element method. According to the WSM-based near field acoustic holography, jointly using SYSNOISE, the sound field of an 80 meters long rotating ellipsoid shell model with a force load was reconstructed. By theoretical deduction and numerical simulation, the factors of reconstruction accuracy were analyzed. Compared with the results by using the WSM and numerical software, it is proved that it is feasible and effective to use WSM for sound field reconstruction. The WSM costs short calculating time and has high efficiency and calculation accuracy in engineering application, which will extend the application range of the WSM on calculating the underwater structures vibration and sound radiation and acoustic holography problems.