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相关概念视频

Differential Leveling01:12

Differential Leveling

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Differential leveling is a precise method in surveying used to determine the elevation difference between two points. Its primary goal is to establish accurate vertical measurements to create level surfaces or grade lines critical for designing and constructing infrastructures such as roads, bridges, and buildings.The procedure for differential leveling begins with setting up and leveling the instrument at a point where the benchmark can be seen. The level rod is held on the benchmark (BM), and...
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使用光滑半连贯图像方法测量浅水中的船舶源水位.

Roberto Yubero1, Christ A F de Jong2, Michael A Ainslie3

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概括

在浅水中测量船舶水下辐射噪声 (URN) 的新方法提高了准确性. 与现有标准相比,光滑半连贯图像 (SSCI) 方法为计算源级 (SL) 提供了更可靠的方法.

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科学领域:

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

背景情况:

  • 从浅水中的船只进行水下声音测量的标准化是一项挑战.
  • 目前的方法,如海底临界角度 (SCA) 方法 (ISO 17208-3草案),可能会低估500Hz以上的源级 (SL).
  • 从声压水平 (SPL) 测量结果中准确地推导出源水平,需要精确的传播损失 (PL) 近似值.

研究的目的:

  • 介绍和评估一种替代方法,即光滑半连贯图像 (SSCI) 方法,用于在浅水中计算传播损失 (PL) 和源级 (SL).
  • 根据分析和经验数据评估SSCI方法的性能.
  • 为水下辐射噪声 (URN) 测量提供更准确,更强大的方法.

主要方法:

  • 开发了光滑半连贯图像 (SSCI) 方法来计算水下传播损失 (PL).
  • 使用分析场景和来自SATURN项目的经验数据评估SSCI方法.
  • 通过多种仪器部署策略,深度和距离进行URN测试.

主要成果:

  • 与SCA方法相比,SSCI方法在广泛的频率范围内计算源级 (SL) 的准确性得到了提高.
  • 该SCA方法显示,大约500Hz以上的SL的总体低估.
  • SSCI方法保持了稳定性,并试图保持SCA方法的简单性.

结论:

  • SSCI方法提供了一个更准确,更可靠的方法来确定浅水中的船舶源水位 (SL).
  • 这种方法解决了现有标准的局限性,例如用于浅水URN测量的ISO 17208-3.
  • SSCI方法为标准化浅水声学测量提供了一个有希望的替代方案.