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Identification and Alteration of Global Resonance Modes in Ship Structures to Reduce Sound Radiation.

机译：船舶结构中全局共振模式的识别与改变，以减少声辐射。

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A ship hull and foundation structure will have many vibratory resonance modes. During the shipbuilding process on land or in a drydock, it would be highly advantageous to determine which of these modes have a potential for strong sound radiation when the ship is waterborne. This research employs an experimental model of a submarine hull and foundation. Small masses are placed on the foundation and hull, and the effects on the vibration spectra of the structure are studied. Based on spectra response, modes are classified as hull modes, foundation modes, or 'global' modes. Global modes are well coupled hull and foundation mode pairs which are closely spaced in frequency. Waterborne testing reveals that global mode pairs are strong waterborne sound radiators. Additionally, the applications of small masses is shown to perturb the coupling between the global mode pairs and yield dramatic changes in the radiated sound. Four foundations of differing size are tested and repeatability of the experimental results is confirmed. As the foundation size increases, global modes are identified on the basis of foundation drive point vibration spectral alone, hull vibration data is not required. Theses. (JHD)

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McCoy, K. M.;
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年度 1989
页码 1-177
总页数 177
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Resonant frequency; Ship hulls; Sound transmission; Submarine hulls; Vibration; Drives; Foundations(Structures); Global; Hulls(Marine); Models; Radiated noise; Ship structural components; Shipbuilding; Sizes(Dimensions); Sound generators; Spectra; Test and evaluation; Theses; Vibrational spectra; Waterborne;

机译：共振频率;船体;声音传播;潜艇外壳;振动;驱动器;基础（结构）;全球;船体（船舶）;模型;辐射噪声;船舶结构部件;造船;尺寸（尺寸）;声音发生器;光谱;测试和评价;论文;振动光谱;水性;

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7. Identification and alteration of global resonance modes in ship structures to reduce sound radiation. [O] . McCoy Kevin Michael 1989

机译：识别和改变船舶结构中的整体共振模式以减少声音辐射。

Identification and Alteration of Global Resonance Modes in Ship Structures to Reduce Sound Radiation.

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