抛物面天线三维随机风场的数值模拟方法研究

针对天线各向尺寸相差不大的结构形式和随机风载的工作状况,考虑到脉动风的相关特性,在脉动风速模拟过程中计入了相位角对模拟结果的影响,建立了抛物面天线结构三维随机风场的模拟方法,并结合Fourier变换方法,运用于随机风场的多点顺风向脉动风速时程模拟。基于Simiu风速功率谱,采用该随机风场模拟方法,对40 m大口径抛物面天线进行三维随机风场模拟,研究了天线旋转后模拟风速的变化,并对模拟样本进行检验。检验结果表明模拟值与目标值吻合良好,从而验证了该方法的有效性。该方法的应用为抛物面天线风振响应计算提供了支持。

Study on Numerical Simulation Method of Three-dimensional Stochastic Wind Field around Parabolic Antenna

In this paper, in view of the antenna structure and the significant and working characteristics of the random wind load in each direction, combined with the correlation of the stochastic wind, a method simulating three-dimensional wind field is presented. It can be used to simulate the stochastic wind velocity for several spots in three-dimensional wind field, which is linked with the Fourier transform. Moreover, based on the Simiu wind velocity power spectrum and the simulated method, a stochastic wind field on the para- bolic antenna with a diameter of 40m is simulated. After that, the effect on the simulated resuhs is researched when the elevation is changed. Finally, the simulated wind field is checked, the checked results show that the simulated values are satisfied with the target values, so the efficiency of the method is verified. This method can be employed to compute the wind-induced response of parabolic an- tennae.