摘要
为研究水深变化对移动载荷激励冰层响应特性的影响,采用有限元分析软件对其进行了数值模拟,计算得到了均匀水深和水深线性变化时冰层的响应特性。将数值计算结果与实冰实验数据进行了比较,发现临界速度值、冰层位移响应波形特征与实验结果一致,且不同速度下的最大下陷值也与实验结果一致。此外,在总结均匀水深冰层位移响应变化计算规律的基础上,对水深线性变化时的冰层位移响应特性进行了数值计算。计算结果表明:当载荷沿水深增加方向运动时,临界速度大于均匀水深情况;沿水深减小方向运动时,临界速度小于均匀水深情况;沿水深增加方向运动比沿水深减小方向运动更容易使冰层破裂。
In order to study the influence of change of water depth on characteristics of ice sheet response to a moving load, a numerical simulation of the ice sheet response to a moving load is carried out through finite element analysis software. The characteristics of response of ice sheet are calculated under the condition of uniform depth and linear change of water depth. Comparison of the calculation results with the data in field experiments shows that a good agreement exists among the value of critical speed and the wave profile of displacement response of ice sheet at the critical speed as well as the experimental results, and that the maximum negative deflection at different speeds is also consistent with the experiment data. Besides, on the basis of the response of ice sheet which is calculated under the condition of uniform water depth, the characteristics of response of ice sheet are calculated nume-rically under the condition of linear change of water depth. The calculation results show that, when the load motion proceeds in the direction of increasing water depth, the critical speed is greater than that in the situation of uniform depth;whereas the critical speed is less when the load motion proceeds in the direction of decreasing water depth than that in the situation of uniform depth;and the motion proceeding in the direction of increasing water depth is more likely to break the ice than in the direction of decreasing water depth.
作者
李宇辰
胡明勇
孟庆昌
张志宏
LI Yu-chen;HU Ming-yong;MENG Qing-chang;ZHANG Zhi-hong(Dept. of Basic Courses, Naval Univ.of Engineering, Wuhan 430033, China)
出处
《海军工程大学学报》
CAS
北大核心
2019年第4期22-27,共6页
Journal of Naval University of Engineering
基金
国家自然科学基金资助项目(51479202)
关键词
冰层响应
水深
临界速度
破冰
ice sheet response
water depth
critical speed
ice-breaking
