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首页> 外文期刊>International journal of structural stability and dynamics >Evaluations of Coupled Transverse-Rotational Galloping of Slender Structures with Nonlinear Effect
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Evaluations of Coupled Transverse-Rotational Galloping of Slender Structures with Nonlinear Effect

机译：非线性效应耦合横向旋转疾驰的评价

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摘要

This paper presents evaluations of coupled two-degree-of-freedom (2DOF) galloping oscillations of slender structures with nonlinear effects, involving coupled transverse and rotational motions. The nonlinear governing equations of the coupled motions are derived by developing nonlinear formulations of the quasi-steady aerodynamic forces and damping coefficients. By solving the eigenvalue problem of a perfectly tuned 2DOF system, an analytical expression of the minimal structural damping ratio required to prevent coupled transverse-rotational galloping is established. The influences of various parameters, such as angle of wind attack, structural height, width and aspect ratio, on the onset wind velocity for the occurrence of coupled galloping are then analyzed in detail by numerical simulations. Comparisons of the onset wind velocity of the coupled 2DOF and uncoupled single-degree-of-freedom (1DOF) galloping are presented and discussed. The nonlinear vibration behavior of coupled 2DOF galloping of slender structures under varying wind speeds is also investigated.
机译：本文介绍了具有非线性效应的耦合二维自由度（2dof）疾驰振荡的评估，涉及耦合横向和旋转运动。通过显影准稳态空气动力力和阻尼系数的非线性制剂来源的耦合运动的非线性控制方程。通过解决完美调谐的2DOF系统的特征值问题，建立了防止耦合横向旋转疾驰所需的最小结构阻尼比的分析表达。通过数值模拟详细分析了各种参数的各种参数，例如风力攻击角度，结构高度，宽度和纵横比的发生角度，如风攻击，结构高度，宽度和纵横比。展示和讨论了耦合2dof的起始风速和非耦合自由度（1dof）疾驰的比较。还研究了在不同风速下耦合2dof粘合的非线性振动行为。

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