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Hydroelasticity effects on water-structure impacts
Experiments in Fluids ( IF 2.4 ) Pub Date : 2020-08-09 , DOI: 10.1007/s00348-020-03024-3
T. Mai , C. Mai , A. Raby , D. M. Greaves

Local and global loadings, which may cause the local damage and/or global failure and collapse of offshore structures and ships, are experimentally investigated in this study. The research question is how the elasticity of the structural section affects loading during severe environmental conditions. Two different experiments were undertaken in this study to try to answer this question: (i) vertical slamming impacts of a square flat plate, which represents a plate section of the bottom or bow of a ship structure, onto water surface with zero degree deadrise angle; (ii) wave impacts on a truncated vertical wall in water, where the wall represents a plate section of a hull. The plate and wall are constructed such that they can be either rigid or elastic by virtue of a specially designed spring system. The experiments were carried out in the University of Plymouth’s COAST Laboratory. For the cases considered here, elasticity of the impact plate and/or wall has an effect on the slamming and wave impact loads. Here the slamming impact loads (both pressure and force) were considerably reduced for the elastic plate compared to the rigid one, though only at high impact velocities. The total impact force on the elastic wall was found to reduce for the high aeration, flip-through and slightly breaking wave impacts. However, the impact pressure decreased on the elastic wall only under flip-through wave impact. Due to the elasticity of the plates, the impulse of the first positive phase of pressure and force decreases significantly for the vertical slamming impact tests. This significant effect of hydroelasticity is also found for the total force impulse on the vertical wall under wave impacts. Hydroelasticity effects on water-structure impacts: a impact pressures on dropped plates; b impact forces on dropped plates; c, d, e, f wave impact pressures on the vertical walls; g wave impact forces on the vertical walls; h wave force impulses on the vertical walls: elastic wall 1 vs. rigid wall (filled markers); elastic wall 2 vs. rigid wall (empty markers)

中文翻译:

水弹性对水结构影响的影响

本研究对局部和全局载荷进行了实验研究,这些载荷可能导致海上结构和船舶的局部损坏和/或整体失效和倒塌。研究问题是结构截面的弹性如何影响恶劣环境条件下的载荷。本研究中进行了两个不同的实验来试图回答这个问题:(i) 方形平板(代表船舶结构的底部或船头的一个板段)以零度死角对水面的垂直撞击冲击; (ii) 波浪对水中截断的垂直壁的影响,其中壁代表船体的板部分。板和壁的构造使得它们可以通过专门设计的弹簧系统具有刚性或弹性。实验是在普利茅斯大学的 COAST 实验室进行的。对于这里考虑的情况,冲击板和/或壁的弹性对砰击和波浪冲击载荷有影响。与刚性板相比,弹性板的砰击冲击载荷(压力和力)显着降低,尽管仅在高冲击速度下。发现弹性壁上的总冲击力因高曝气、翻转和轻微破碎的波浪冲击而降低。然而,只有在翻转波冲击下,弹性壁上的冲击压力才会降低。由于板的弹性,垂直砰击冲击试验中第一正相压力和力的冲量显着降低。对于波浪冲击下垂直壁上的总力脉冲,也发现了水弹性的这种显着影响。水弹性对水结构冲击的影响:对落板的冲击压力;b 对掉落板的冲击力;c、d、e、f 波浪对垂直壁的冲击压力;g 垂直壁上的波浪冲击力;h 垂直壁上的波浪力脉冲:弹性壁 1 与刚性壁(填充标记);弹性墙 2 与刚性墙(空标记)
更新日期:2020-08-09
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