Lightweight design of all-aluminum Cassegrain laser receiving system structure

Abstract

In order to meet the design requirements of more compact and portable laser detection system, the parameters optimization design of lightweight structure is carried out for the receiving system with large quality proportion. Firstly, based on the index requirements of the system for performance and structure, the scheme of Cassegrain optical receiving system is selected, and it is clear that the receiving system is an all-aluminum card mechanical structure. Then, through the numerical analysis of the mode and static force of the receiving lens, the main reflector is selected as the optimization object. After that then the multi wheel topology optimization design is carried out by using the finite element analysis method, and the dynamic simulation analysis of the whole receiving system is carried out. Finally, it is determined that the lightweight hole form of the back opening of the main reflector is fan-shaped, the thickness is 4mm, and the weight loss rate is 31.4%. Under certain vibration and impact environment conditions, the system structure still has good stability. According to the design and optimization results, the processing and assembly of the lens are completed.Through alignment test and surface inspection, the PV value of the main reflector is 2.293λ, and the RMS is0.509λ (λ=1064nm). Both of them meet the requirements of optical design. It shows that the accuracy of the main reflector surface improved by top 1 ology optimization can meet the application requirements. which has a certain reference significance for the structural design in the field of aircraft laser ranging.