Lightweight for the coaperture structure of a infrared imaging and laser emission system
                                   HENG Nan1,2, ZHENG Fenghua1,2,3, LI Jinpeng1,2,3
(1.Nanjing Astronomical Instruments Research Center, University of Science and Technology of China,Nanjing 210042, China; 2.Nanjing Astronmical Instruments Research Center, Chinese Academy of Sciences, Nanjing 210042, China; 3.Nanjing Astronomical Instruments Co., Ltd.,Chinese Academy of Sciences, Nanjing 210042, China)


Abstract: Aiming at the problem of lightweight design for a coaperture structure of the infrared imaging and laser emission system, optimization and simulation of the main supporting tube and testing study on the infrared imaging prototype were finished based on low mass and high mechanical quality. Firstly, a model with simplified loads was used, the mathematical model and initial lightweight design structure were obtained based on variable density method which took flexibility as objective function, the mass retention ratio as constrain. Then the final lightweight design model was achieved by using central composite design and multiobjective genetic algorithm based on response surface method. Lastly, modulation transfer function and focal length of the infrared imaging prototype were tested. The simulation results indicate that lightweight rate of the final model is improved 13%,1st natural frequency is increased 24.7%, the maximum equivalent stress is decreased 42.3% and the maximum deformation is decreased 20.7%, the experimental results show optimized tube can satisfy the operating requirements.
Key words: coaperture; lightweigh design; topology optimization; multiobjective optimization