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Apparatus and methods

机译：仪器和方法

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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，吸声和​​散射之间的相关性。开发了一种气泡液体有效参数的模型，该模型可以使人们获得与实验现场研究相吻合的结果。结果表明，海面下的“气泡云”大大增加了海水的声音散射和非线性声学参数。为了探讨存在障碍物时的距离变换问题，提出了一种基于元胞自动机的避障欧氏距离变换方法。本研究以南海为例，导入海陆分布和目标点的数据，以从当前细胞到目标细胞的最短避障路径的长度为细胞状态，设计了该状态。在考虑距离算子的情况下，对每个蜂窝的变换规则进行仿真，然后模拟避障距离的传播，得到避障距离变换的结果栅格。通过对避障效果和精度的分析，得出以下结论：首先，该方法可以直观，动态地显示避障距离变换的过程，可以自动计算出绕过地面的最短距离。其次，该方法具有自动更新机制，在仿真过程中每个蜂窝可以根据其相邻蜂窝对距离值进行校正。最后，为精确的避障欧氏距离变换提供了一种近似解，比例误差小于3.96％。所提出的方法可以应用于航线设计，海上搜救等领域。

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