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71.
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An experimental investigation of irregular wave forces on quasi-ellipse caisson structures is presented. Irregular waves were generated based on the Jonswap spectrum with two significant wave heights, and the spectrum peak periods range from 1.19 s to 1.81 s. Incident wave directions relative to the centre line of the multiple caissons are from 0° to 22.5°. The spacing between caissons ranges from 2 to 3 times that of the width of the caisson. The effects of these parameters on the wave forces of both the perforated and non-perforated caissons were compared and analyzed. It was found that the perforated caisson can reduce wave forces, especially in the transverse direction. Furthermore, the relative interval and incident wave direction have significant effects on the wave forces in the case of multiple caissons. 相似文献
73.
机械系统中激励源传出的波将沿传输路径衰减,并会经由含源子系统边界传递出去,因而只有输入功率的残余部分以混响场的形式消耗在该子系统内。为提高应用统计能量分析法(SEA)计算振动噪声的精度,对上述过程进行深入分析,并以一个简单梁系为例,给出传入该梁系的输入功率的表达式。分析结果表明,传输波对计算结果的影响随着损耗因子的增加而增加。同时,分析将传输波的影响计入诸如舰船这种复杂空间结构的实际可行性。估算结果表明,仅对含源子结构考虑传输波的影响是充分可行的。 相似文献
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该文通过对异型箱梁桥有限元模型的建立、输出数据的整理及分析,说明异型箱梁桥的空间分析方法,为类似桥梁的结构分析及设计提供了参考。 相似文献
79.
以黄骅港近岸气象资料为依据,预测该区大风天外海风浪要素,再经浅水传播变形推算黄骅港海区风浪场,判定破碎波多发位置,结果证明方法可靠。 相似文献
80.
Hideaki Miyata Akihiro Kanai Takafumi Kawamura Jhong-Chun Park 《Journal of Marine Science and Technology》1996,1(4):183-197
Three-dimensional (3D) wave breaking around bodies of complex geometry has been numerically investigated by use of two types
of Navier-Stokes solvers, namely the finite-difference and the finite-volume methods employing rectangular and curvilinear
coordinate systems, respectively. Both methods employ the density-function technique to capture the free surface location
and can cope with complicated free surface configurations such as breaking waves. The accuracy of the density-function method
is examined through the comparison with experimental results, and it is confirmed to be satisfactory when the grid spacing
and the time increment are sufficiently small.
New computational methods are applied to several problems including 3D breaking waves around ships and wave diffraction around
offshore structures. The computed results show good agreement with experimental results indicating that wave breaking phenomena
are successfully simulated. The qualitative accuracy, however, could be improved by including the dissipating effect of breaking
waves. 相似文献