机载箱体式红外相机安装基座的优化设计

Design of trunk supporting base of infrared camera for the airborne platform

红外相机的安装基座作为所有光学元件的安装基准,它的结构刚度直接影响着相机的成像质量。为了实现支撑基座的高刚度、低重量和小体积,从机载红外相机的性能指标和光学系统设计结果出发,结合机载环境的应用需要,提出了红外相机安装基座的设计要求;采用UG三维软件优化设计出"U"形和箱体式两种轻量化结构的安装基座,并采用Patran有限元分析软件对设计结果进行了仿真计算。对比计算结果可知:"U"形安装基座的最大变形量是箱体式结构的6.8倍,最大内应力是箱体式结构的3倍;在确定了安装基座的箱体式结构形式后,对优化设计的安装基座进行了模态分析和扫频试验,基座的固有频率约为560 Hz,满足设计指标要求。此外,分析结果与试验数据接近也证明了设计方法和分析手段的正确性。

Due to all optics elements fixed on the supporting base of infrared camera,imaging quality of infrared camera is directly influenced by structure rigidness of supporting base.To realize high rigidness,light weight and small volume of supporting base,firstly,design request of supporting base is put forward on the base of requisite performances of infrared camera,designed optics system and applying condition on the airborne platform.Then,＂U＂ type supporting base and trunk supporting base is designed to lightweight by UG and two structures of supporting base are respectively analyzed by Patran.Contrasting to analysis results of two structures,maximal distortion of ＂U＂ type supporting base is 6.8 times of the trunk one and maximal stress of ＂U＂ type supporting base is 3 times of the trunk one.After trunk supporting base being chosen,its mode analysis and experiment for its resonance frequency is made.Resonance frequency of trunk supporting base is about 560 Hz,which satisfies application requests of airborne platform.The designing and analyzing method is proved to be right.