Dynamic response of articulated towers under correlated wind and waves
Dynamic response of articulated towers under correlated wind and waves
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DOI：
10.1016/j.oceaneng.2017.01.019
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发表时间：
2017-03
影响因子：
5
通讯作者：
M. M. Zaheer-M.;Nazrul Islam
中科院分区：
文献类型：
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作者：
M. M. Zaheer-M.;Nazrul Islam
本文研究了双铰铰接塔在波浪作用下的动力特性，以及风和波浪相互作用下的动力特性。分析包括由于非线性拖曳力、波动浮力、可变附加质量和瞬时塔方位引起的非线性。脉动风荷载采用Ochi和Shin谱，波浪荷载采用Pierson-Moskowitz（P-M）谱。利用汉密尔顿原理推导了非线性动力学方程。运动方程在时域内用Wilson-θ法求解。给出了在高、中、低海况下纵荡、倾斜运动、铰剪和弯矩的功率谱密度函数。研究相关的风和波浪被发现是必不可少的双铰链铰接塔服务和生存在极端的海洋环境。响应PSDF突出了塔架的风致动力响应。
This paper deals with the dynamic behavior of a double-hinged articulated tower to wave alone, and correlated wind and waves. The analysis includes the nonlinearities due to nonlinear drag force, fluctuating buoyancy, variable added mass and instantaneous tower orientation. The fluctuating wind load is modeled by Ochi and Shin spectrum, while the wave load is characterized by Pierson–Moskowitz (P–M) spectrum. The nonlinear dynamic equation of motion is derived by Hamilton's principle. The equations of motion are solved in time domain by using Wilson-θ method. Power spectral density function (PSDF) of surge, tilting motion, hinge shear and bending moment are presented under high, moderate and low sea states. Studies of correlated wind and waves are found to be imperative for double hinged articulated towers to serve and survive in the extreme ocean environment. The response PSDF highlights the wind induced dynamic responses of the tower.