摘要
为了研究脉动风引起的结构振动问题,以两塔三跨不等高输电塔线体系为工程背景,将瞬时风速与瞬时风压的脉动部分之间的关系简化为线性,采用Davenport谱得到了脉动风荷载的功率谱密度函数;通过振动方程得到了稳态频率响应函数;根据系统的输入输出关系求出了在物理坐标下输电塔线体系的位移响应谱密度矩阵,从而推导了输电塔线体系风振响应频域分析的简化方法;利用MATLAB编制频域分析程序,对塔线体系进行计算,并将此结果与采用ADINA计算所得结果进行了对比。结果表明:两者的跨中和塔中位移功率谱密度曲线分别在点(0.05,2000)和点(0.05,9×10-6)附近有个相同的峰值,两种方法的计算结果基本吻合,验证了本文推导的输电塔线体系风振响应频域分析的简化方法的正确性;此种方法在获得准确风振响应的同时可以提高求解的计算效率。
In order to study wind-induced vibration response of tower-line structure,a two-tower and three-span transmission tower-line system is taken as model,the Davenport spectrum is chosen to describe the power spectrum density function of fluctuating wind load,the power spectrum density matrix of displacement response under physical coordinate is obtained by using frequency response function of vibration equation.At last,a simplified method for frequency domain analysis of wind-induced vibration response of transmission tower-line system is gotten.The computed results in the frequency domain via the MATLAB are compared with the ones via the ADINA.The power spectrum densities via the MATLAB and ADINA,respectively,of displacement response of transmission line have the same peak value near the point(0.05,2000) on the transmission line,and the same peak value near the point(0.05,9×10-6) on the transmission tower.The results show that the method of frequency domain analysis on wind-induced vibration response is correct.The simplified frequency domain analysis method not only leads to correct wind-induced vibration response but also improves computing efficiency.
出处
《应用力学学报》
CAS
CSCD
北大核心
2013年第5期782-786,809,共5页
Chinese Journal of Applied Mechanics
关键词
输电塔线体系
脉动风
风振响应
频域
transmission tower-line system,fluctuating wind,wind-induced vibration response,frequency domain
