波浪作用下上部带有透空结构的圆筒垂向水动力特性的解析研究

发布时间：2018-07-07 14:26

本文选题：透空结构 + 漂浮圆筒　；参考：《工程力学》2017年12期

【摘要】：基于线性势流理论,应用特征函数展开方法和透空壁内流体速度与两壁间压力差成正比的线性模型,建立了上部带有透空结构的截断圆筒绕射问题和辐射问题的解析模型,进而导出浮体的垂荡运动响应幅值算子计算公式。通过与直立透空圆筒和非透空截断圆柱的相关结果进行对比,验证了该文推导的正确性。通过数值计算研究了透空系数、圆筒内外径比(内圆柱半径和圆筒半径之比)和吃水比(透空结构吃水和圆筒吃水之比)对整个圆筒的垂向水动力特性(运动响应幅值、附加质量、辐射阻尼和波浪激振力)的影响,并与非透空截断圆柱的计算结果进行对比分析。结果表明随着透空系数的增大,结构的附加质量和辐射阻尼呈增加趋势,垂荡运动响应幅值算子的峰值呈明显减小趋势,并且在低频区垂向波浪激振力相对较小,这有利于增加浮式结构的稳定性;内外径比和吃水比均对透空结构的垂向水动力特性影响较大。
[Abstract]:Based on the theory of linear potential flow, the analytical model of truncated cylinder diffraction problem and radiation problem is established by using the eigenfunction expansion method and the linear model in which the velocity of the fluid in the perforated wall is proportional to the pressure difference between the two walls. Furthermore, the formula for calculating the amplitude operator of the response of floating body is derived. The correctness of the proposed method is verified by comparing the results with the vertical perforated cylinder and the non-permeable truncated cylinder. The vertical hydrodynamic characteristics (the amplitude of motion response) of the whole cylinder are studied by numerical calculation of the permeability coefficient, the ratio of the inner and outer diameter of the cylinder (the ratio of the inner cylinder radius to the cylinder radius) and the draught ratio (the draught ratio of the permeable structure to the cylinder draft). The effects of additional mass, radiation damping and wave excitation force are compared with the calculated results of an impermeable truncated cylinder. The results show that the additional mass and radiation damping of the structure increase with the increase of the permeability coefficient, and the peak value of the response amplitude operator of the vertical motion decreases obviously, and the vertical wave excitation force is relatively small in the low frequency region. It is beneficial to increase the stability of floating structure, and the ratio of internal and external diameter and draft water have great influence on the vertical hydrodynamic characteristics of the porous structure.
【作者单位】：大连理工大学海岸和近海工程国家重点实验室;大连理工大学海洋与科学技术学院;
【基金】：国家自然科学基金项目(51379037,51679036) 教育部新世纪优秀人才计划项目(NCET-13-0076)
【分类号】：P731.22;P75

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