基于数值模拟的射电望远镜台址测风塔位置优选方法研究

Research on Wind Tower Position Optimization Method of Radio Telescope Site Based on Numerical Simulation

射电望远镜天线结构设计和观测任务的正常进行都需要台址风场信息.随着望远镜性能要求的提高,天线结构设计越来越复杂,风载荷对天线观测时造成的指向影响也越发明显,如何在设计时保证结构刚度和强度,在观测时提高有效观测时间,都需要准确的风场数据.由于传统台址测风塔布置方法无法对测风塔拟设点的可靠性做出定量化评估,因此提出一种基于数值模拟优化测风塔位置的方法.数值模拟基于规范参数设置边界条件,与实测数据比较,整体趋势吻合,满足精度需求.对试验台址设置了4个测风塔位置,经分析P2点与天线位置的风速均方根误差值(root-mean-square error,RMSE)最小,测得的数据更能表征天线区域的风场特性.

Wind field is a critical issue for radio telescope antenna structure design and observation.As the telescope performance requirements are getting higher and higher,the antenna structure design becomes more and more complicated,and the influence of wind load on antenna pointing in the observation is also serious.How to ensure the stiffness and strength of the structure during the design and improve the effective observation time during the observation all needs accurate wind field data.Due to the traditional wind tower setup method cannot quantitatively evaluate the reliability of the setting point position,so a method based on numerical simulation to optimize the position of the wind tower is proposed.The boundary conditions of numerical simulation are set based on specification parameters,the overall trend is consistent with the measured data,therefore the simulation accuracy could meet the requirement.Four wind tower positions were set at the test site.According to simulation results,the root-mean-square error(RMSE)of wind speed between point P2 and the antenna position is the smallest.So,the measured data in P2 could better represent the windfield characteristics of the antenna area.