Analysis And Optimization Of Foldingand Deployment Performance Of Composite Cylindrical Thin-walled Hinge

Space deployable mechanism is an important component of satellite,which directly affects the strength and working accuracy of satellite antenna.Compared with traditional mechanical hinge deployable structure,hyperelastic hinge made of composite material has the characteristics of light weight,small folding volume,high deployment accuracy and strong flexural and torsional resistance,so it has important research value.In this paper,composite tape spring and composite cylindrical thin-walled hinge are the main research objects.In order to improve the overall performance of satellite antenna,the static and dynamic characteristics of composite cylindrical thin-walled hinges are studied in depth,and their structure and material parameters are optimized.The main contents of this paper are as follows:(1)Based on composite material mechanics,engineering shell theory and large deflection bending theory of thin plate,the analytical model of composite tape spring was established,and the quasi-static bending characteristics of tape spring were studied.The finite element model of composite tape spring was established,and its bending characteristics were analyzed by using the method of display dynamic integration.The results of the finite element model were compared with the analytical model to verify the accuracy of the model.Based on the finite element model,the effects of structural parameters of composite tape spring on the mechanical properties of tape spring were studied.(2)The finite element model of composite cylindrical thin-walled hinge was established,and its quasi-static bending and torsion performance was analyzed by using the display dynamic integration method.The effects of structural parameters of composite cylindrical thin-walled hinge on its static mechanical properties such as bending and torsion were studied.The experimental design method and the surrogate model methods such as response surface method,Kriging model,radial basis function neural network,generalized regression neural network and support vector machine are studied.The most accurate method was selected to establish the surrogate model of quasi-static bending and torsion process of composite cylindrical thinwalled hinge.On the basis of physical model,multi-objective optimization method was used to optimize static mechanical properties such as bending and torsion.(3)The theoretical formula for calculating the equivalent thermal expansion coefficient of laminated composite materials was derived,and the finite element model of the antenna frame was established.The thermal deformation of the antenna frame was analyzed by using the finite element model.The effect of thermal expansion coefficient of composite material and equivalent thermal expansion coefficient of laminated composite material on thermal deformation of antenna frame was studied.Multi-island genetic algorithm was used to optimize the lamination angle of laminated composite material for reducing thermal deformation of antenna frame.(4)Based on the finite element model,the dynamic deployment characteristics of composite cylindrical thin-walled hinges were studied.The overshoot phenomenon and vibration attenuation during the unfolding process were analyzed,and the vibration during the dynamic unfolding process is reduced by laying a self-damped layer.