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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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Development of New Methods for Quantifying Fish Density Using Underwater Stereo-video Tools
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分布式3D水声定位方法与曲线体积阵列使用单个自动潜水电缆.

Jinyi Wu, Zhaoyong Wang, Yifan Liu

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    一种新的分布式3D水声定位方法使用单个电缆形成一个曲线体积阵列 (CVA). 这种方法克服了有效的水下目标跟踪和海上安全的部署挑战.

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    科学领域:

    • 海洋学 海洋学 海洋学
    • 声学 声学 在声学方面
    • 海洋工程 海洋工程

    背景情况:

    • 分布式光纤传感对于水下目标跟踪至关重要.
    • 由于严格的传感电缆部署要求,目前的方法面临重大障碍.
    • 在海洋环境中需要强大而实用的3D定位技术.

    研究的目的:

    • 提出一种新的分布式3D水声定位方法.
    • 使用单一的自动潜水电缆构建一个曲线体积阵列 (CVA).
    • 为了解决在水下应用中部署电缆的实际挑战.

    主要方法:

    • 使用单一的自动潜水电缆来创建用于声场检测的CVA.
    • 在检测到的声场和源电缆位置之间建立了映射关系.
    • 水下目标的3D位置通过这种映射来确定.

    主要成果:

    • 海上试验验证了使用93米电缆的方法,在25米的横向距离下达到2.2米 (SD 0.3m) 的平均定位误差.
    • 该系统展示了1100m的最大定位范围.
    • 模拟显示了对部署偏差的稳定性 (水平偏移:9m,旋转:5°,局部偏移:10m).

    结论:

    • 拟议的基于CVA的方法为分布式3D水声定位提供了一个可行的解决方案.
    • 它有效地减轻了与在浅水中部署电缆和阵列时间变化的挑战.
    • 这项技术有可能在海洋环境中显著推进水下目标监测.