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Radiation efficiency of submerged rectangular plates

机译：浸没矩形板的辐射效率

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摘要

The average radiation efficiency of point-excited submerged rectangular plates is investigated in two methods, deterministic analysis and statistical approach, respectively. In the deterministic analysis, the effect of mutual impedance by water loading on the velocity of the plate is illustrated analytically by using a modal summation method. The cross-modal contributions to the average radiation efficiency are averaged to zero by averaging over all possible excitation positions on the plate. In the statistical approach, by analyzing the engineering formulae of the average radiation efficiency in air, this paper modifies the formulae to be applicable in water. The numerical comparisons show that the modified formulae reflect the average level in the frequency region controlled by corner modes and are accurate enough in the region controlled by monopole and edge modes. On this basis, approximate expressions for predicting the average radiation efficiency of the submerged beam-stiffened rectangular plates are proposed. The main differences between air loading and water loading are considered. Firstly, as dry modes taken in analysis instead of real vibration modes in water, the vibration of the stiffened plate is not only determined by the first mode but by several modes simultaneously at low frequencies. Secondly, the "corner mode region" becomes inappropriate as the plate is stiffened. The proposed formulae are validated numerically in different size, thickness, and stiffener amount of the stiffened plate.
机译：用确定性分析和统计方法两种方法分别研究了点激励淹没矩形板的平均辐射效率。在确定性分析中，通过使用模态求和方法分析性地说明了水负载的互阻抗对板速度的影响。通过平均板上所有可能的激发位置，将对平均辐射效率的交叉模态贡献平均为零。在统计方法中，通过分析空气中平均辐射效率的工程公式，本文修改了这些公式以适用于水中。数值比较表明，改进的公式反映了转角模式控制的频率区域中的平均水平，并且在单极模式和边缘模式控制的区域中足够准确。在此基础上，提出了近似的表达式，用于预测浸没光束的矩形板的平均辐射效率。考虑了空气负荷和水负荷之间的主要区别。首先，作为分析中的干燥模式而不是水中的实际振动模式，加劲板的振动不仅由第一模式决定，而且还由低频下的几种模式共同决定。其次，当板变硬时，“角模式区域”变得不合适。所提议的公式在加筋板的不同尺寸，厚度和加筋量下得到了数值验证。

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  • 来源
    《Applied Acoustics》 |2012年第2期|p.150-157|共8页
  • 作者

    Zhao Cheng; Jun Fan; Bin Wang; Weilin Tang;

  • 作者单位

    School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

    School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

    School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

    School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    average radiation efficiency; submerged rectangular plates; beam-stiffened plates;

    机译：平均辐射效率;浸没的矩形板;梁加劲板;

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