浅水岸壁条件下脉冲荷载引起的粘弹性浮冰层位移响应  

Displacement response of viscoelastic floating ice sheet subjected to impulse load under different bank conditions

作　　者：鹿飞飞 张志宏[1] 胡明勇[1] 刘巨斌[1] 

机构地区：[1]海军工程大学理学院,武汉430033

出　　处：《振动与冲击》2015年第14期142-146,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51479202);国家科技部基础研究项目(2008DFR704607)资助

摘　　要：建立脉冲荷载作用下粘弹性浮冰层位移响应理论模型,在将浅水岸壁简化为缓坡、陡坡岸壁两种情况下,基于Fourier,Laplace,Hankel变换结合方法对该理论模型积分、数值计算。通过与均匀水深计算结果比较,验证理论模型及计算方法的正确性。分析脉冲荷载作用下水深、冰厚、岸壁斜度等参数对浮冰层位移响应影响。结果表明,水深增加时冰层位移响应幅值随之增加,但增加趋势变缓;冰层厚度减小时其位移响应幅值呈非线性大幅增长;岸壁斜度增加时冰层位移响应幅值增加,振动频率加快。浅水岸壁的存在及斜度增加可引起冰-水系统振动能量累积,使脉冲荷载能激励更大冰层变形响应。A theoretical model for displacement response of viscoelastic floating ice sheet subjected to impulse load was established,and it was solved by Fourier,Laplace and Hankel integrated transform method under both the gentle and steep bank conditions.By comparing with the computational result under the uniform water depth assumption,the established theoretical model and calculation method were validated.The influences of depth of water,thickness of ice sheet,slope of bank on the displacement response of floating ice sheet under impulse load were analyzed.These calculated results show that when the water depth increases,the amplitude of displacement response of ice sheet increases simultaneously,but the variation trend slows down gradually.When the thickness of ice sheet decreases,the amplitude of displacement response of ice sheet will grow with a sharp and nonlinear performance.When the slope of bank increases, the amplitude and vibration frequency of displacement response of ice sheet will increase.Due to the existence of bank and increase of slope,the vibration energy will accumulate in ice and water system,which can excite greater deformation response of ice sheet.

关 键 词：积分变换法 浅水岸壁 脉冲荷载 粘弹性 浮冰层 响应 

分 类 号：O35[理学—流体力学]