Active Adjustment Method for Space Deployable Structure Considering Parameter Uncertainties

Abstract

Affected by the alternating temperature field in space, the space deployable structure produces large thermal deformation, which leads to the deterioration of surface accuracy and performance. To achieve high surface accuracy of the deployable structure in the presence of model parameter uncertainties caused by manufacturing and assembly errors as well as complicated space environments, an active surface adjustment method for a space deployable structure based on interval model updating and the kriging model is proposed. First, the initial finite element model is modified by the interval model updating based on the universal gray number to reveal the inherent relationship between the adjustment amount and surface accuracy. Second, based on the updated model, the sensitivity analysis of the adjusting rod is carried out to reveal the influence degree of the adjusting rod on the displacement of the surface measuring point so as to determine the position of the adjusting rod quickly. Then, the interval optimization model of the surface accuracy adjustment is established. Next, the optimal adjustment amount is determined through optimization iteration combined with the kriging model. Finally, a numerical example is presented to demonstrate the feasibility and validity of the proposed active adjustment method.