Research on Wind Load Analysis of Telescope

The operation of a telescope is inevitably affected by wind loads, which can cause relative displacement between the primary and secondary mirrors, resulting in telescope pointing errors and reduced telescope performance. This article is based on an actual laser communication telescope, establishes a finite element model of the telescope, and conducts static and random wind load analysis on the telescope. Firstly, in the static wind load analysis, the deformation amount of the system under static wind load is obtained; then, modal analysis is performed on the telescope to obtain the dynamic characteristics of the system, and the harmonic response analysis is conducted on the system to determine the optical axis disturbance characteristics of the system; finally, the PSD analysis is performed on the telescope system to obtain statistical results of the random changes in the positions of the primary and secondary mirrors under random wind loads. The calculation result shows that offset of the secondary mirror relative to the primary mirror in the Y direction caused by wind load is 1.6 μm; the RMS value of the optical axis pointing error caused by Y-direction wind load is 0.55 inches, which is within the allowable accuracy range.