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关节的灵活性能是航天服改进设计的一个重要方向,平褶式关节是一类典型的航天服软关节。为全面了解平褶式关节的活动特性,利用有限元方法构建了平褶式关节的仿真模型,该模型能够反映关节的主要材料和结构特征,计算得到了关节的阻力矩-角度关系。为验证模型,开展了关节原理样件的阻力矩测量,分析了模型误差的来源。比较了有限元方法和经典分析方法,并进一步讨论了平褶式关节阻力矩的组成。结果表明,有限元模型能够反映关节弯曲运动的基本特征,尽管关节运动初期和伸展运动后期阻力矩计算的准确性还有待提高,但与经典分析方法相比具有显著的优势。此外,结合模型结果分析得到平褶式关节阻力矩由压缩气体、材料摩擦以及结构的弹性变形引起。
The flexibility of joints is an important direction for the improvement of space suit design. Flat-fold joints are a kind of typical space suit. In order to fully understand the motion characteristics of flat-fold joints, the finite element method is used to build the simulation model of flat-fold joints. The model can reflect the main materials and structural features of the joints and calculate the resistance moment-angle relationship of the joints. In order to validate the model, the resistance moment measurement of joint prototype specimen was carried out and the source of model error was analyzed. The finite element method and the classical analysis method are compared, and the composition of the resistance of the flat fold joint is discussed further. The results show that the finite element model can reflect the basic characteristics of the joint flexural motion. Although the accuracy of the resistance moment calculation at the initial stage of articulation and the late stage of extension exercise needs to be improved, it has significant advantages compared with the classical analysis method. In addition, the analysis of the model results shows that the flat-fold joint resistance moment is caused by compressed gas, material friction and elastic deformation of the structure.