摘要
根据有限元分析得到单塔的非线性刚度软化特征,结合平均风下导线的动力特性,依据Lagrange方程建立了简化的输电塔线耦联系统的MDOF模型,将其应用于统计线性化方法,计算了系统在强风荷载下的非线性随机动力响应频域近似解。与数值模拟计算结果的比较显示,该方法的计算结果不仅具备一定的精度,还可以对系统动力失稳的临界风荷载作出判断。
An approximate 3DOF model for transmission tower-line system was established,which combines the softening nonlinear stiffness of tower by static FEM analysis and the dynamic characteristics of conductor distorted under mean wind load.Utilizing the method of statistical linearization,the analytical solution of stochastic response of tower-line coupled system under strong wind was derived.Comparing with numerical simulation,the results show that the analytical solution obtained by the herein developed procedure is enough precise for engineering use,and can be taken as an auxiliary tool in judgment of critical wind speed.
出处
《振动与冲击》
EI
CSCD
北大核心
2010年第6期62-65,共4页
Journal of Vibration and Shock
基金
国家自然科学基金委创新研究群体基金(编号:50621062)
国家自然科学基金(50508026
50778135)资助
关键词
输电塔
风
非线性模型
统计线性化
transmission tower
wind
nonlinear dynamic model
statistical linearization
