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Study on Hydroelasticity for Realization of Very Large Floating Structures

实现超大型浮动结构的水弹性研究

基本信息

批准号：
10555346
负责人：
KASHIWAGI Masashi
金额：
$ 5.89万
依托单位：
KYUSHUUNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

(1) A new calculation method was developed for a column-supported very large floating structure, in which the elastic deflection of the upper deck was represented by a superposition of natural modes of a rectangular thin plate, and hydrodynamic interactions among a great number of supporting columns were correctly taken into account.(2) Model experiments have been conducted using 64 vertical circular cylinders arranged in 4 rows and 16 columns with equal separation distance. Measured were hydrodynamic forces on some of individual cylinders and the wave elevation along the center line of the structure. Measured results were in good agreement with the computed results by the newly-developed hierarchical interaction theory.(3) Two different calculation methods were developed for computing the wave drift force and moment on a column-supported very large floating structure. One is the so-called "far-field" method based on the momentum-conservation principle, and the other is the "near-field" method by the direct pressure integration.The drift force on the whole 64 cylinders was precisely predicted by both methods, confirming the validity of both numerical methods. The local steady forces on each cylinder were also measured and the results were in good agreement with computed results by the "near-field" method.(4) A time-domain calculation method was developed for evaluating transient elastic responses of a pontoon-type floating structure due to the take-off and landing of airplanes. Special efforts were devoted to the numerical accuracy and efficiency. Computed results were compared with measurements at the Ship Research Institute, which showed very good agreement confirming the validity of the developed numerical scheme.

(1)针对柱支承超大型浮式结构，提出了一种新的计算方法，该方法将上部甲板的弹性变形用矩形薄板的固有模态叠加表示，并正确地考虑了大量支承柱之间的水动力相互作用。(2)采用64个等间距的4排16列直立圆柱体进行了模型试验。测量了作用在某些单个圆柱上的水动力和沿结构中心线沿着的波高。测量结果与新发展的分层相互作用理论的计算结果吻合良好。(3)针对柱支承超大型浮式结构物，提出了两种不同的波浪力和波浪力矩计算方法。一种是基于动量守恒原理的“远场”方法，另一种是基于直接压力积分的“近场”方法，这两种方法都精确地预测了全部64个圆柱体上的漂移力，验证了两种数值方法的有效性。同时测量了各圆柱体上的局部定常力，其结果与近场法的计算结果吻合较好。(4)提出了一种计算浮筒式浮体结构在飞机起降过程中瞬态弹性响应的时域计算方法。特别努力致力于数值精度和效率。计算结果与船舶研究所的测量结果进行了比较，结果显示出很好的一致性，证实了所开发的数值方案的有效性。