同轴轻型空间遥感器支撑桁架的设计与试验

Design and test of supporting truss for light space remote sensor

为满足空间遥感器的高度轻量化要求,提高其结构的基频,减少100 Hz以下低频振动的影响,研究了高比刚度的轻型支撑桁架结构。针对同轴长焦距光学系统,基于三角形稳定的原理设计了一种6杆碳纤维复合材料桁架结构,并基于有限元法完成了其优化设计,使其质量降低了11%。为验证其可行性,研制了力学模拟件,进行了工程分析和动力学试验,并讨论了分析和试验的误差来源。分析和试验显示,模拟件的固有频率超过了120 Hz,表明所设计的支撑桁架合理可行,能够满足长焦距空间遥感器的使用要求。该结构在质量为13 kg的前提下,解决了目前该型遥感器基频较低的难题,该设计已成功应用于某相机结构中。

Supporting trusses with high specific stiffness were studied to lighten the mass of light space remote sensors and to improve the natural frequencies of support trusses.According to a coaxial optical system with long focal length,a carbon fibre truss with six rods was designed,then the design was optimized by finite element method.After optimization,the mass of the supporting truss is reduced by 11%.To verify the feasibility of the truss,a model prototype was developed and the error sources were discussed. Analysis and test results show that prototype＇s natural frequency is higher than 120 Hz.These research verifies that the truss can satisfy the application requirements of space remote sensors when the mass of the truss is controlled lower than 13 kg.It solves the problem that this kind of space remote sensor has a low natural frequency and has been applied to a space camera practically.