Influence of shape structure for floating shock platform on transverse shock spectrum
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摘要: 基于ABAQUS软件中的声固耦合法，采用设备、平台一体化分析方法，展开对中型浮动冲击平台的研究，探讨平台外形结构形式对平台冲击环境的影响，并提出了提高平台横向冲击谱谱值的设计方案。首先对外形结构进行初步设计，分析其对平台冲击谱的影响，并找到决定影响程度的关键因素。然后针对结构进行优化，使其更大幅度的提高平台冲击谱谱值。计算表明：在平台外部下方加装挡板结构不会明显影响平台垂向冲击谱，但可以提高平台横向冲击谱；舷侧底端向下延伸加装竖直挡板由于受到冲击波绕射和阻力的影响，增加横向谱值的效果不是很明显；平台底部流线型挡板可以有效增加平台对爆炸载荷的接收效果，同时可以尽量减小阻力影响，从而明显提高平台横向冲击谱谱值。Abstract: Based on the acoustic coupling method in ABAQUS software, this paper adopts the equipment and platform integration analysis method on the study of medium floating shock platform. Discusses the impact of platform shape structure on platform shock environment, and proposes the design scheme to increase the transverse shock spectrum of the platform. First, the preliminary design of the shape structure is carried out to analyze its influence on the platform shock spectrum, and find the key factors which determine the influence degree. Then, optimize the structure to increase the shock spectrum of the platform. The calculation shows that the vertical shock spectrum of the platform is not significantly affected by the addition of baffle structure below the external platform, but the transverse shock spectrum will be improved. Due to the influence of shock wave diffraction and resistance, installing the vertical baffle at the bottom of the side can’t obviously increase the transverse shock spectral. The streamlined baffle at the bottom can effectively increase the receiving capacity of the platform on the explosive load.And at the same time, it can also reduce the influence of resistance as far as possible, so as to significantly increase the transverse shock spectrum of the platform.
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Key words:
- underwater explosion /
- floating shock platform /
- shock environment /
- shock spectrum
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图 6 250 Hz滤波前后平台内底时历加速度响应
Figure 6. The acceleration response of the front and rear platform of the 250 Hz filter is obtained
图 9 舷侧竖直挡板与无挡板的各测点水平冲击谱对比
Figure 9. Horizontal shock spectrum with and without vertical baffle plates
图 16 底部流线挡板冲击波绕射现象
Figure 16. The bottom streamline baffle wave diffraction phenomenon
图 19 流线挡板结构与无挡板结构各测点冲击谱对比
Figure 19. Comparison of the impact spectrum between the flow baffle structure and the non-baffle structure
表 1 中型浮动冲击平台外形尺寸
Table 1. Size of medium floating impact platform
长度/m 宽度/m 本体高度/m 顶盖高度/m 内底高度/m 质量/t 吃水深度/m 12.2 6.1 4.22 3.05 1.0 92.27 1.33 
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表 2 有无挡板4测点谱值平均值对比
Table 2. comparison of the mean value of the four measuring points
结构 垂向谱速度/(m∙s−1) 垂向谱位移/cm 横向谱速度/(m∙s−1) 横向谱位移/cm 无挡板 2.698 11.81 0.846 3.08 挡板1 2.616 11.94 1.078 3.22 挡板2 2.773 12.26 1.238 3.65
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