The dynamics and control of large space structures after the onset of thermal shock

Abstract This paper considers the problem of predicting the open and closed loop dynamics of large space structures after the onset of thermal shock. The thermal gradients induced in space structures due to solar radiation heating result in thermal deformations. The temperature gradient time history, the related thermal deflection response, the moments acting on a thermally deflected beam, and the control effort required for different combinations of solar incidence angles and material properties are considered in this investigation. The analysis is performed for structures which are nominally inertially stabilized as well as gravity stabilized. For the case of basic orbiting structural elements, such as a free-free plate (modelled as a beam in-plane), depending on the orientation, and required pointing accuracy, it may be necessary to redesign control algorithms previously developed for models which exclude the thermal shock effects.