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横向风荷载作用下轴向运动弦线自激振动和稳定性分析

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Indexed by:期刊论文

Date of Publication:2008-02-28

Journal:工程力学

Included Journals:EI、PKU、ISTIC、CSCD

Volume:25

Issue:2

Page Number:40-45

ISSN No.:1000-4750

Key Words:非线性振动;轴向运动弦线;自激振动;风荷载;Hopf 分岔

Abstract:研究了横向定常风荷载作用下轴向运动弦线的非线性自激振动问题.将风荷载模型化为平均风速的非线性函数,建立动力学微分方程.采用 Galerkin 方法,将运动弦线简化为离散的二维系统并进行线性化,分析弦线平衡构型的稳定性,根据 Romh-Hurtwitz 判据确定了平衡点的稳定域.确定了多参数下 Hopf 分岔点及产生稳定极限环的条件.使用增量谐波平衡(IHB)法求解了自激振动的周期响应,按照 Floquet 理论确定了周期解的稳定性.最后,讨论了运动速度和平均风速稳定性的影响,并给出相应的稳定性条件.

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