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Apparatus and methods

机译：设备和方法

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A correlation between acoustical nonlinearity, sound absorption, and scattering in a subsurface bubble-saturated layer is established. A model of effective parameters of a bubbly liquid is developed that allows one to obtain results coinciding with experimental field studies. It is shown that "bubbly clouds" under the sea surface increase substantially the sound scattering and the nonlinear acoustic parameter of the seawater. To explore the problem of distance transformations while obstacle existing, this paper presents an obstacle-avoiding Euclidean distance transform method based on cellular automata. This research took the South China Sea as an example, imported the data of land-sea distribution and target points, took the length of the shortest obstacle-avoiding path from current cell to the target cells as the state of a cellular, designed the state transform rule of each cellular that considering a distance operator, then simulated the propagation of obstacle-avoiding distance, and got the result raster of obstacle-avoiding distance transform. After analyzing the effect and precision of obstacle avoiding, we reached the following conclusions: first, the presented method can visually and dynamically show the process of obstacle-avoiding distance transform, can automate calculate the shortest distance bypass the land; second, the method has auto update mechanism, each cellular can rectify distance value according to its neighbor cellular during the simulation process; At last, it provides an approximate solution for exact obstacle-avoiding Euclidean distance transform, the proportional error is less than 3.96%. The proposed method can apply to the fields of shipping routes design, maritime search and rescue, and so on.
机译：建立了地下气泡饱和层中声学非线性，吸音和散射之间的相关性。开发了一种起泡液的有效参数模型，其允许人们获得与实验场研究重合的结果。结果表明，海面下方的“起泡云”基本上增加了海水的声音散射和非线性声学参数。为了探讨距离存在的距离变换问题，避免了基于蜂窝自动机的避免欧几里德距离变换方法。这项研究占据了南海以例，进口陆海分布和目标点数据，占据了最短的障碍避免从当前电池到目标细胞作为蜂窝的状态的长度，设计了国家考虑距离运算符的每个蜂窝的变换规则，然后模拟避免距离的传播，并获得了避免遥控距离变换的结果栅格。在分析避免障碍物的效果和精度后，我们达到了以下结论：首先，呈现的方法可以在视觉上和动态地显示避免避免距离变换的过程，可以自动计算最短的距离绕过土地;其次，该方法具有自动更新机制，每个蜂窝可以根据仿真过程中的相邻蜂窝来整流距离值;最后，它为精确的避免欧几里德距离变换提供了一个近似解决方案，比例误差小于3.96％。该方法可以应用于航线设计，海上搜索和救援等领域。

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    《Oceanographic Literature Review》 |2019年第5期|947-948|共2页
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