浅海环境下的声学灵敏度核函数研究
发布时间：2018-10-10 17:12
【摘要】：灵敏度核函数是声学观测量扰动与声速扰动之间的关系量,表征了声学观测量对声速场扰动的敏感性及其空间特性.目前在水声学中灵敏度核函数的研究主要集中于水平均匀的海洋声波导中,针对不同的声速扰动,灵敏度核函数体现出良好的线性特性.由于实际的海洋声波导往往是水平不均匀的情况,灵敏度核函数的空间特性与波导的空间不均匀性间存在较复杂关系,需开展进一步探究.首先模拟了水平均匀的浅海声波导环境中的声传播,分析了不同射线对应的相位灵敏度核函数和传播时间灵敏度核函数特性,结果表明,相位和传播时间灵敏度核的空间特性存在较大差异,相位灵敏度核在沿着本征射线上影响较大,而传播时间灵敏度核的影响区域主要在本征射线周围的菲涅尔区.继续模拟了不同的本征射线,声速场对灵敏度核的影响程度也存在较大差异.针对水平不均匀海洋波导情况,相应仿真结果显示当声源距涡旋中心较远时,仿真射线对应的相位灵敏度核函数的空间积分值趋于恒定,这表明灵敏度核函数同样适用于水平不均匀的海洋波导中,其灵敏性与射线和声速扰动的相对空间位置有关.这些结果为灵敏度核函数在海洋声学实验站点优化设计和海洋环境参数声学获取等方面的应用提供有利支撑.
[Abstract]:The sensitivity kernel function is the relation between acoustic observation disturbance and acoustic velocity disturbance. The sensitivity of acoustic observation to acoustic field disturbance and its spatial characteristics are characterized. At present, the research of sensitivity kernel function in underwater acoustics is mainly focused on the horizontal homogeneous ocean acoustic waveguides. The sensitivity kernel function shows good linear characteristics for different acoustic velocity disturbances. Because the actual ocean acoustic waveguides are often horizontal non-uniform, there is a complex relationship between the spatial characteristics of the sensitivity kernel function and the spatial inhomogeneity of the waveguides, which needs to be further explored. In this paper, the sound propagation in a horizontal and uniform shallow water acoustic waveguide is simulated. The phase sensitivity kernel function and propagation time sensitivity kernel function of different rays are analyzed. The results show that, The spatial characteristics of phase and propagating time sensitive nuclei differ greatly. Phase sensitive nuclei have a great influence on the intrinsic rays along the path, while propagating time sensitive nuclei mainly affect the Fresnel region around the intrinsic rays. Different intrinsic rays are simulated, and the influence of sound velocity field on sensitivity nucleus is also different. In the case of horizontal inhomogeneous ocean waveguides, the corresponding simulation results show that when the sound source is far from the vortex center, the spatial integral value of the phase sensitivity kernel function corresponding to the simulation ray tends to be constant. It is shown that the sensitivity kernel function is also suitable for the horizontal nonuniform ocean waveguides, and its sensitivity is related to the relative spatial position of the ray and acoustic perturbation. These results provide favorable support for the application of sensitivity kernel function in the optimization design of ocean acoustic experimental sites and the acoustic acquisition of marine environmental parameters.
【作者单位】： 中国海洋大学信息科学与工程学院;
【基金】：中央高校基本科研业务费项目(201362036) 国家自然科学基金(41176033)
【分类号】：TB52
，
本文编号：2262608
[Abstract]:The sensitivity kernel function is the relation between acoustic observation disturbance and acoustic velocity disturbance. The sensitivity of acoustic observation to acoustic field disturbance and its spatial characteristics are characterized. At present, the research of sensitivity kernel function in underwater acoustics is mainly focused on the horizontal homogeneous ocean acoustic waveguides. The sensitivity kernel function shows good linear characteristics for different acoustic velocity disturbances. Because the actual ocean acoustic waveguides are often horizontal non-uniform, there is a complex relationship between the spatial characteristics of the sensitivity kernel function and the spatial inhomogeneity of the waveguides, which needs to be further explored. In this paper, the sound propagation in a horizontal and uniform shallow water acoustic waveguide is simulated. The phase sensitivity kernel function and propagation time sensitivity kernel function of different rays are analyzed. The results show that, The spatial characteristics of phase and propagating time sensitive nuclei differ greatly. Phase sensitive nuclei have a great influence on the intrinsic rays along the path, while propagating time sensitive nuclei mainly affect the Fresnel region around the intrinsic rays. Different intrinsic rays are simulated, and the influence of sound velocity field on sensitivity nucleus is also different. In the case of horizontal inhomogeneous ocean waveguides, the corresponding simulation results show that when the sound source is far from the vortex center, the spatial integral value of the phase sensitivity kernel function corresponding to the simulation ray tends to be constant. It is shown that the sensitivity kernel function is also suitable for the horizontal nonuniform ocean waveguides, and its sensitivity is related to the relative spatial position of the ray and acoustic perturbation. These results provide favorable support for the application of sensitivity kernel function in the optimization design of ocean acoustic experimental sites and the acoustic acquisition of marine environmental parameters.
【作者单位】： 中国海洋大学信息科学与工程学院;
【基金】：中央高校基本科研业务费项目(201362036) 国家自然科学基金(41176033)
【分类号】：TB52
，
本文编号：2262608
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