基于有限元方法的航天服平褶式关节建模

Modeling of spacesuit flat pattern mobility joint based on finite element method

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。

Flexibility of mobility joint is one of the important directions to improve the spacesuit design,and flat pattern mobility joint is a kind of typical soft joint of spacesuit.In order to make a comprehensive understanding of the mobility property of flat pattern mobility joint,a simulation model of flat pattern mobility joint,which reflects its main features of material and structure,is built based on the finite element method.And the relationship between torque and angle is obtained by calculation.To verify the model,torque of joint prototype is measured and error sources of model are analyzed.The finite element method and classical analytical methods are compared and the composition of torque is also discussed.Results show that the finite element model can describe essential characteristics of joint movement.Although the accuracies of joint torque during the initial state of joint bending and the latter period of joint extending need to be improved,it shows more advantages than the classical analytical methods.In addition,it can be concluded from the result analysis that torque of flat pattern mobility joint is induced by compressing gas,friction of materials and elastic deformation of structure.