Thermal–structural analysis of large deployable space antenna under extreme heat loads

Abstract

2016)Thermal-structural analysis of large deployable space antenna under extreme heat loads, Journal of Thermal Stresses, 39:8, 887-905, ABSTRACT Large deployable space antennas may be exposed to severe thermal environments in future space missions; extreme heat loads will result in considerable thermal stresses and deformations which seriously a ects the accuracy of the antenna's parabolic surface. In this study, thermal-structural nite element analysis of a deployable AstroMesh antenna under extreme heat loads was presented. Considering position and orientation with respect to the Sun and Earth, the antenna's temperature changing law under orbital heat uxes was rst evaluated to nd the worst condition as loading point. Analyses for the antenna under di erent levels of extreme heat loads were then performed to obtain the temperature distributions utilizing an equivalent quarter antenna model. Based on the temperature calculation results and prestress designs, structural analyses were nally made to gain the resulting stresses and deformations. The analysis results show that the existing antenna may generate signi cant performance distortion under extreme thermal environments; so attentions for reliability and safety under such conditions should be taken seriously in future antenna works. Modeling and analysis method proposed in this article was validated to be contributive in antenna's thermal and precompensation designs. ARTICLE HISTORY

Surface Shape Stability Design of Mesh Reflector Antennas Considering Space Thermal Effects

“…Based on the above deduction, arbitrary triangular membrane element k can be equivalent to three cable elements, and the equivalent tensions and cross-sectional areas of the cables can be obtained from (13) and (18). Furthermore, for the AstroMesh reflector, there is a common boundary between any two triangular membrane elements.…”

“…satisfactory results. On the other hand, as on-orbit AstroMesh reflectors are affected by time-variant space thermal environment, the surface accuracy will be deteriorated due to thermal deformation [12], [13]. Therefore, how to effectively control the on-orbit thermal deformation of AstroMesh reflectors has become a hot topic in recent years [14]- [20].…”

Numerical evaluation of thermal stresses generated in laminated composite structure exposed to low temperatures

“…In case of a complex geometry structure, this analysis has to be done numerically using the finite element method (FEM). This method was successfully used for solving different problems involving thermal stresses [7][8].…”

Effects of different loads on structure deformation of “L”‐type large‐diameter buried pipe network based on flow–heat–solid coupling

“…Several failure forms appear because of the flow–heat–solid coupling phenomenon in network systems such as infinite plastic flow, cyclic plastic deformation, fatigue failure, and overall instability. Pipeline steering parts (elbow, tee, and taper pipe) bear larger pressures in three‐dimensional turbulent fluid flow at high temperature and pressure, and also increase the overall structure deformation …”

“…Pipeline steering parts (elbow, tee, and taper pipe) bear larger pressures in three-dimensional turbulent fluid flow at high temperature and pressure, and also increase the overall structure deformation. [9][10][11] Fluid-structure interaction mechanics is a branch of fluid and solid mechanics that is mainly concerned with the behavior of solids in a flow field and the influence of solid deformation on flow field. 12,13 If the flow field, temperature field, and structure are solved separately, the computational results of structural deformation caused by the heat transfer and fluid pressure of the pipe network will deviate from the actual situation.…”