Characterization of variable hydrodynamic coefficients and maximum responses in two-dimensional vortex-induced vibrations with dual resonances
Characterization of variable hydrodynamic coefficients and maximum responses in two-dimensional vortex-induced vibrations with dual resonances
复制标题
DOI：
10.1115/1.4027805
复制
发表时间：
2014-10
期刊：
影响因子：
--
通讯作者：
H. Zanganeh;N. Srinil
中科院分区：
文献类型：
--
作者：
H. Zanganeh;N. Srinil
提出了一种唯象模型和分析-数值方法，系统地描述了具有双重二比一共振的二维涡激振动中的可变水动力系数和最大可实现响应。该模型是基于双Duffing和货车der Pol振荡器，模拟一个灵活安装的圆柱受到均匀流和振荡，同时在横向流/线方向。根据系统的二次和三次非线性，振幅，振荡频率和相位关系，解析的封闭形式的表达式推导出参数化评估的流体激励，惯性和增加的质量力分量，以及最大的双共振响应的关键水动力系数。确定了平均阻力的放大系数。数值预测与实验比较的定性验证进行了讨论。参数调查突出系统的非线性，质量，阻尼和自然频率比的重要影响。
A phenomenological model and analytical-numerical approach to systematically characterize variable hydrodynamic coefficients and maximum achievable responses in two-dimensional vortex-induced vibrations with dual two-to-one resonances are presented. The model is based on double Duffing and van der Pol oscillators which simulate a flexibly-mounted circular cylinder subjected to uniform flow and oscillating in simultaneous cross-flow/in-line directions. Depending on system quadratic and cubic nonlinearities, amplitudes, oscillation frequencies and phase relationships, analytical closed-form expressions are derived to parametrically evaluate key hydrodynamic coefficients governing the fluid excitation, inertia and added mass force components, as well as maximum dual-resonant responses. The amplification of the mean drag is ascertained. Qualitative validations of numerical predictions with experimental comparisons are discussed. Parametric investigations are performed to highlight the important effects of system nonlinearities, mass, damping and natural frequency ratios.