某红外相机稳定平台框架结构设计与分析

Design and Analysis of Gimbal-structure in an Infrared Camera Stabilized Platform

针对某红外相机稳定平台,设计了两轴两框架的结构形式。对相机关键支撑结构件照准架进行了较为详细的结构设计和分析研究。照准架采用一体式半封闭结构,提高了照准架的自身结构刚度,同时避免了大尺寸面的加工变形以及装调问题。建立了照准架的三维模型,并进行了6g重力、常温和-20℃均匀温降工况下的静力学分析和模态分析研究。分析结果显示,照准架的最大变形为0.706mm,最大应力为47.33 MPa;1阶模态为53.2 Hz,均满足设计指标。利用有限元软件为红外系统照准架的设计可行性提供了理论依据。

A structure of two axes and two frameworks is designed for an infrared-camera stabilized platform. A more detailed structural design and analysis are conducted for sight frame of the camera key support structure. An integrated semi-enclosed structure is used in the sight frame to improve its own structural rigidity, while avoiding the machining deformation and alignment problems of large surface. An azimuth-sweep range of ± 90° is achieved, with dual motor drive in pitch direction. A three-dimensional model of sight frame is established, and conditions of the 6g gravity, temperature and -20℃ uniform of temperature drop are conducted for static and modal analysis. The results show that the maximum deformation of sight frame is 0.706 mm, the maximum stress is 47.33 MPa, and 1 order modal shapes is 53.2 Hz, which all meet the design specification. The use of finite element sottware provides a theoretical basis for the design feasibility of sight frame of an infrared sighting system.