OPTIMIZATION METHOD ON CONTROL LING THERMAL DEFORMATION OF LARGE SPACE DEPLOYABLE TRUSS STRUCTURES

摘要

In the deep low space environment, large space deployable structures are exposed to solar radiation, heat from earth albedo and infrared-radiation. And thermal deformation due to different temperature would effect their applications. In order to control the thermal deformation, a FEA model of 30-meters long truss structure in LEO was established. By using original thermal control coating, large thermal deformation was found on the top of the truss, it cannot meet the requirements. In order to minimize the thermal deformation, principle of adjusting thermal control coatings was established. That is, the temperature differences which locate on the three longerons at the same section along the truss should to be the minimum. Then surface coatings of the longerons were adjusted, until temperature difference of the three longerons was the minimal. It was found that the thermal deformation of the whole truss was corresponding to the smallest value. The optimum method provided in this paper may give some reasonable references and advices for the thermal design and the thermal analysis of large space deployable truss structures.