To meet the requirements of a large-scale space infrared camera for a lighter weight and higher rigidity framework with complex support function ,a framework entirely formed by trusses was designed .Then ,the feasibility and reliability of the frame were demonstrated by structure analysis , technological test and mechanical test .The framework was combined by 58 carbon fiber struts and 21 joints to form the main support structure of the camera .It could support most of optical modules in circumference distribution and could meet the weight requirement less than 55 kg .The methods and steps for gluing the subassemblies were described particularly ,then the finite element analysis and mechanical experiment were used to verify that the triangle enclosed truss structure in stress state could offer an adequate safety margin even if the adhesive strength was reduced . Mechanical experiment results show that the basic frequency of the framework is 90 .4 Hz ,which is consistent with the results of finite element analysis and higher than the limited frequency of 60 Hz .%针对大型空间红外相机对复杂支撑功能且重量小、刚度高框架的需求,本文设计了一个全部由桁架杆互相支撑形成的框架,并通过结构分析、工艺试验和力学试验验证了框架的可行性和可靠性.该框架由58根碳纤维支撑杆和21个接头组合形成相机的主支撑结构,可支撑多个周向分布的光学组件,且满足框架总质量不超过55 kg的要求.介绍了框架的装调和胶接方法和步骤,进行了有限元分析和力学试验,验证了三角形封闭的桁架杆结构在黏接强度降低的情况下,仍能够在相机受力状态下具有足够的安全裕度.力学试验得到框架的一阶谐振频率为90.4 Hz,满足一阶谐振频率不低于60 Hz的要求,与有限元分析结果相符.
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