多变量三维风场的简化及应用

The simplification and application of multi-variable three-dimensional wind field

三维空间风场在三个方向上相关性很小,可认为各个方向是相互独立的。对于输电线路的影响而言顺风向脉动作用是主要的,远大于其它两个方向,可简化为一维风场计算。以小波为分析工具,实现由风载荷功率谱到风速-时间历程的转变,并对模拟结果进行了比较。研究结果表明:小波分析在风载荷模拟中可靠性较高,可为输电线路风响应的进一步研究提供参考。

The correlation in three directions of the three-dimensional wind field is very small,it can be thought as independent in every direction.The along wind direction which is much more important than the other two directions for transmission line can be simplified as the only calculated direction.The wavelet analysis is used as the tool to simulate the wind velocity by the change from the power spectrum of the wind to the wind-time history,and the simulated results are compared.The results show that: the wavelet analysis has an ideal reliability on the wind load simulation,so it can provide the basis for further study for transmission lines’ responses to the wind load.