六棱柱模块化可展开薄膜遮光罩设计与分析

The deployable sunshield is a critical aerospace device for suppressing and eliminating stray light, prevent-ing external heat flux intrusion, and improving the imaging quality of optical systems. It is a forefront and hotspot in academic research and practical applications in space science and deep space exploration. To address the urgent de-mands for large-scale, high-storage-ratio sunshields in lunar exploration, Mars exploration, and interstellar missions, a modular scalable cylindrical sunshield configuration is proposed. Firstly, based on the modular concept, a redun-dantly driven deployable support mechanism with a rigid-flexible coupled multibody system is developed using the Sar-rus mechanism as the fundamental configuration. The deployment, retraction, locking, and stiffening mechanisms of the structure are explained, and the spatial geometric coordinate method is employed to analyze the motion patterns of key nodes during the deployment process. Secondly, finite element models of single-layer folded membranes under various parameters are established using ABAQUS to investigate parameter effects on mechanical behavior during de -ployment. Optimal design parameters are determined through comparative analysis, followed by dynamic simulations of multilayer membrane deployment processes to characterize stress evolution patterns. Thirdly, a finite-element model of the fully deployed state of the entire sunshield is established, and a structural modal analysis is conducted to analyze the variation laws of the natural frequency and vibration mode. Finally, a multi-module sunshield prototype is developed, and deployment functionality tests are conducted on a microgravity test platform. The results show that the designed sunshield effectively achieves deployment and locking functions, with coordinated and interference-free de-ployment of the mechanism and membrane, thereby verifying the correctness of the proposed principle and design. This study provides a theoretical foundation and technical reference for research on similar spacecraft sunshields.