Design And Analysis Of Space Deployable Cable-driven Telescopic Mechanism

With extensive and in-depth development of China’s space exploration process, the high-performance spatial developable mechanism has become increasingly important and urgent, especially in the aspect of stiffness, precision, reliability, etc. Therefore the study on the equipment for deep space detection is very important for earth observation and imaging.Based on the understanding of the structure and function characteristics of different developable mechanism, a new kind of space deployable cable-driven telescopic mechanism(SDCTM) is developed with detailed design indicators. Kinematic model of SDCTM is established and the deployment velocity, displacement of primary mirror are obtained. The factors and rules influencing mass and structural natural frequencies were analyzed by solving the finite element parametric model, and then designed a reliable pin lock scheme.Based on the results obtained from the analysis, the detailed structure is designed. The deployable mechanism is composed with three thin telescopic canisters, the canisters are pulled out by cables rolled on motor shaft, canisters are locked each other by stop pins after deployment to maintain stiffness. The whole system rigid-flexible coupling modal is developed and analyzed, the driving force of the deployment process is simulated. The simulation results demonstrate that the calculation results of mathematical model are good in accordance with the simulation data. Use of the finite element method, the temperature distribution and thermal deformation of the mechnism in space thermal environment is obtained.Axial rigidity, bending rigidity and torsional rigidity were calculated. Based on the analysis of FEA, a simplified dynamic model was established in this paper. Dynamic model of SDCTM is established to analyze nature frequencies and mode shapes of the mechanism. The nature frequencies and vibration modes are obtained in different status.To validate the design, a principle prototype was developed, and deployable function test, repeat positioning accuracy test, static stiffness test and modal test were carried out on the mechanism. The results of experiments show that the mechanism can achieve the desired function. It also show that the mechanism have good performance in dynamics. The correction of the theoretical analysis is verified by comparing with experimental results.