【摘要】：靈敏度核函數(shù)是聲學觀測量擾動與聲速擾動之間的關(guān)系量,表征了聲學觀測量對聲速場擾動的敏感性及其空間特性.目前在水聲學中靈敏度核函數(shù)的研究主要集中于水平均勻的海洋聲波導中,針對不同的聲速擾動,靈敏度核函數(shù)體現(xiàn)出良好的線性特性.由于實際的海洋聲波導往往是水平不均勻的情況,靈敏度核函數(shù)的空間特性與波導的空間不均勻性間存在較復雜關(guān)系,需開展進一步探究.首先模擬了水平均勻的淺海聲波導環(huán)境中的聲傳播,分析了不同射線對應的相位靈敏度核函數(shù)和傳播時間靈敏度核函數(shù)特性,結(jié)果表明,相位和傳播時間靈敏度核的空間特性存在較大差異,相位靈敏度核在沿著本征射線上影響較大,而傳播時間靈敏度核的影響區(qū)域主要在本征射線周圍的菲涅爾區(qū).繼續(xù)模擬了不同的本征射線,聲速場對靈敏度核的影響程度也存在較大差異.針對水平不均勻海洋波導情況,相應仿真結(jié)果顯示當聲源距渦旋中心較遠時,仿真射線對應的相位靈敏度核函數(shù)的空間積分值趨于恒定,這表明靈敏度核函數(shù)同樣適用于水平不均勻的海洋波導中,其靈敏性與射線和聲速擾動的相對空間位置有關(guān).這些結(jié)果為靈敏度核函數(shù)在海洋聲學實驗站點優(yōu)化設計和海洋環(huán)境參數(shù)聲學獲取等方面的應用提供有利支撐.
[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.
【作者單位】： 中國海洋大學信息科學與工程學院;
【基金】：中央高�；究蒲袠I(yè)務費項目(201362036) 國家自然科學基金(41176033)
【分類號】：TB52
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本文編號：2262608