CAJ | 학술논문

风载是影响地基望远镜性能的主要因素之一，为了研究风载荷的作用以及对望远镜性能的影响程度，首先建立了望远镜、圆顶和流场的几何模型。然后利用CFD(Computational Fluid Dynamics)分析了在外界风速为10 m/s的情况下，3种不同高角(30o、60o、120o)流场中截面空气速度、压力、湍流动能以及主镜面的静压力的瞬态分布，最后通过有限元方法获得了主镜去除刚体位移后的面形。仿真结果表明，望远镜以不同高角观测时主镜面静压力功率谱密度与Gemini望远镜的实测结果接近，真实模拟了风载荷的作用。由风载引起的镜面变形RMS值分别为3.74E-1 nm，2.5E-2 nm，1.71E-1 nm，满足面形精度要求。
풍재시영향지기망원경성능적주요인소지일，위료연구풍재하적작용이급대망원경성능적영향정도，수선건립료망원경、원정화류장적궤하모형。연후이용CFD(Computational Fluid Dynamics)분석료재외계풍속위10 m/s적정황하，3충불동고각(30o、60o、120o)류장중절면공기속도、압력、단류동능이급주경면적정압력적순태분포，최후통과유한원방법획득료주경거제강체위이후적면형。방진결과표명，망원경이불동고각관측시주경면정압력공솔보밀도여Gemini망원경적실측결과접근，진실모의료풍재하적작용。유풍재인기적경면변형RMS치분별위3.74E-1 nm，2.5E-2 nm，1.71E-1 nm，만족면형정도요구。
Wind load is one of the main factors that affects the performance of ground- based telescopes, in order to investigate the function of wind load and the influence degree on the telescope, firstly, the telescope, dome, and exterior flow field geometry were established. Secondly, Computational Fluid Dynamics (CFD) was used to analyze the instantaneous distribution of the air's velocity, pressure and static pressure on primary mirror, at three different altitude angular(30o, 60o, 120o), when the wind at the speed of 10 m/s. Finally, the primary mirror surface accuracy was gotten after removed the rigid body displacement through the finite element method. The simulation results show that static pressure power spectral density of the primary mirror is close to the measured data of Gemini telescope, better simulate the practical effect of the wind load. The RMS values of the mirror surface deformation caused by wind load are 3.74E- 1 nm, 2.5E- 2 nm, 1.71E- 1 nm meet the surface accuracy requirement.