| With the development of space optics technology,As a new means of high-speed communication,space laser communication plays an important role in military reconnaissance and space detection.As the core assembly of the laser communication optical terminal system,the surface shape accuracy of the reflecting mirror has a direct effect on the communication quality of the whole optical tstem.Its lightweighting has a great effect on improving the performance of the servo systeerminal.The reflecting mirror assembly is the dynamic load of the servo tracking sym.Therefore,it is necessary to design a reasonable reflecting mirror assembly structure under the condition of reducing weight as much as possible to meet the optical performance of the entire system.In this paper,the reflecting mirror assembly of single reflecting mirror laser communication optical transceiver is taken as the research object.The research objective is to ensure the reflecting mirror surface quality and reduce the weight of the module structure.The reflecting mirror assembly is optimized and designed in detail.On the premise of meeting the performance indicators,reduced the weight of the assembly,realized the light and miniaturized design of the optical transceiver and provided the premise and guarantee for small satellite space laser communication.Through investigating various attributes of the common materials of the reflecting mirror assembly,and according to the requirements of the system’s use environment,this article selects the glass crystal(Zerodur)as the reflecting mirror material,indium steel(4J32)as the flexible support material,titanium alloy(TC4)as the material of the back support plate.The cross-sectional shape of the reflecting mirror is designed as a light-weight contoured structure on the rear surface of the cone.According to the structural characteristics of the reflecting mirror and the space size limitation,the support method of the reflecting mirror is designed as the center support.The key dimensions of the reflecting mirror are analyzed by using sensitivity analysis and parameter optimization Optimized design.A flexible support structure with a slotted bottom surface was designed in accordance with the thermodynamic environment during the operation of the reflecting mirror assembly,and the flexible support was parametrically designed using the orthogonal optimization method.The back support plate of the reflecting mirror is designed as a U-shaped structure.The back support plate is lightweighted by using topology optimization technology.The thickness of different positions of the back support plate is optimized to reduce the mass of the back support plate from 272 g to 205 g The weight reduction rate reached 24.63%,and the maximum displacement decreased by 44.23%.Finally,in order to verify the dynamic,static stiffness,and thermal dimensional stability of the reflecting mirror assembly,modal analysis,force-heat analysis,overload analysis,sinusoidal vibration and random vibration analysis were performed on the reflecting mirror component.The results of various analyses show that the reflecting mirror assembly has good characteristics and meets the design task requirements.The ZYGO interferometer was used to test the surface shape of the reflecting mirror in the temperature range of(20±10)°C.The results showed that the PV value of the reflecting mirror surface shape was better than λ/6,and the RMS was better than λ/43,which met the requirements of RMS≤ λ/40.The frequency sweep test was performed on the reflecting mirror assembly using a shaking table.The experimental result is that the first-order resonance frequency of the reflecting mirror assembly is 362.53 Hz,which meets the index requirement of 300 Hz.The relative error with the simulation result is 2.7%,and the analysis results are relatively accurate,verifying the rationality of the optimal design of the reflecting mirror assembly. |
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