Optimization Design of Structural Surface Precision of Shape Memory Cable Mesh

The cable mesh of the large circumjacent truss deployable antenna has been subjected to heat radiation from the sun and planets for a long period of time with the satellite movement, which will produce greater thermal deformation and mechanical relaxation, resulting in a decline in the performance of the antenna. Aiming at the precision of cable mesh structures, a designed method for structural integration optimization of shape memory alloy and cable mesh structure is proposed, improving the surface precision of cable antenna by using shape memory effect of shape memory cable. A geometric nonlinear finite element analysis model of the shape memory cable mesh structure is established, the pretension of the cable are calculated and an active adjustment strategy is adopted to optimize the deformation of the surface under the influence of temperature. The results show that reasonable selection of the parameters of shape memory alloy can obviously improve the surface accuracy of shape memory cable structure and realize the on-orbit shape preservation of large deployable antennas. A numerical example is presented to demonstrate the feasibility of the method.