Singular-Free Stress Analysis and Modal Analysis of Infrared Lens Structure

In traditional lens design Often only the empirical design of the appearance of the mechanical structure is carried out, and the strength check and modal analysis for the lens in a complex vibration environment are carried less often. The structural rationality cannot be well evaluated in the increasingly complex lens industrial application environment. This article designs the mechanical structure of a zoomable infrared vision lens and carries out finite element stress analysis for the structural dangerous parts. It is pointed out that stress singularity should be paid attention to when performing finite element stress analysis. If necessary, rounding should be added at the sharp corners where stress singularity occurs, and local mesh subdivision can be performed to effectively eliminate stress singularity. Therefore, to achieve convergence result. In addition, the modal analysis of the lens structure is carried out in this paper, and the first 6 modes are extracted. The stress and modal analysis results show that the lens can maintain sufficient structural strength and stability in a complex vibration environment.