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Free transverse vibration of ocean tower

机译:海塔的自由横向振动

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This paper studies a continuous, elastic model of an ocean tower, partially submerged in water, undergoing free transverse vibration in a plane. The tower is modeled as a non-uniform Timoshenko beam which is supported by an eccentric tip mass on one end and a non-classical damped foundation on the other. The foundation is modeled as a combination of translational and rotational springs and dampers. The effect of shear deformation and rotary inertia is included in the analysis. The free vibration equation is derived using Hamilton's variational principle based on two approaches, Rayleigh Ritz Method (RRM) and Finite Element Method (FEM), which show a good agreement in results. The computational efficiency of RRM over FEM is shown using a convergence study. Finally, a parametric study is done to demonstrate the dependence of natural frequency on different configurations of the tower. (C) 2015 Elsevier Ltd. All rights reserved.
机译:本文研究了海洋塔的连续弹性模型,该模型部分浸没在水中,并在平面中受到自由横向振动。该塔被建模为非均匀的Timoshenko梁,该梁的一端由偏心尖端质量支撑,另一端由非经典阻尼基础支撑。基础建模为平移弹簧和旋转弹簧以及阻尼器的组合。分析中包括剪切变形和转动惯量的影响。使用汉密尔顿变分原理,基于瑞利·里兹方法(RRM)和有限元方法(FEM)两种方法,得出了自由振动方程,它们在结果上具有很好的一致性。使用收敛研究显示了RRM在FEM上的计算效率。最后,进行了参数研究,以证明固有频率对塔架不同配置的依赖性。 (C)2015 Elsevier Ltd.保留所有权利。

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