AN Qi Chang, ZHANG Jing xu, YANG Fei, ZHAO Hong Chao

 

(Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China)

 

 

Abstract: Aiming at understanding the performance of the large telescope, those three basic methods to specify the wind load are shown while the response of the large telescope under wind was more and more interested by the engineers. The shortage and advantage of the three approach, namely, power spectral density method, computational fluid dynamics and modal model method were presented in the paper. Concretely, power spectral density method is the first method. According to this method, the wind spectrum cannot always satisfy the ideal model achieved form the statistics method. The computational fluid dynamics (CFD) is the second one for this method, major concerned thing is the modeling accuracy. The results indicate that for the next generation ground based telescope, the previous testing on the dummy mirror is necessary to processed to achieve the response to the wind load,after the PSD and CFD is applied.

 

Key words: large telescope; wind load; finite element analysis(FEA); power spectral density; response function