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风载是影响地基大口径光电望远镜性能的重要因素之一,其作用会直接影响主次镜面型精度,引起望远镜指向误差,从而降低其成像精度和跟踪性能。为了研究风载对望远镜的影响程度,介绍了风载的概念,建立了风压力谱的数学模型。借助有限元法,建立了1.2 m望远镜系统的有限元模型,分析了主镜在静态风载压力下的面型变化,以及望远镜系统在动态风载作用下的随机响应情况。计算出风载引起主镜镜面变形RMS值为0.65 nm,跟踪指向误差RMS值为0.015 6″。结果表明:风载影响在精度允许范围之内。
Wind load is one of the most important factors affecting the performance of large-aperture optical telescope. Its function will directly affect the primary and secondary mirror-type accuracy, causing the pointing error of the telescope, thus reducing its imaging accuracy and tracking performance. In order to study the influence of wind load on telescope, the concept of wind load is introduced and a mathematical model of wind pressure spectrum is established. With finite element method, the finite element model of the 1.2 m telescope system was established. The change of the mirror shape under the static wind load pressure and the random response of the telescope system under the dynamic wind load were analyzed. The RMS value of mirror deformation of main mirror caused by wind load was calculated to be 0.65 nm, and the RMS value of tracking error was 0.015 6 ". The results show that the influence of wind load is within the allowable range of accuracy.