The mesh sleeve compensator is widely used in aerospace pipeline systems,and the axial stiffness of the compensator is its basic mechanical parameter.However,its complex microstruc-ture characteristics make the axial stiffness exhibit strong nonlinearity.To achieve simulation cal-culation of the entire axial stretching process of the mesh sleeve compensator,this article starts with the steel wire mesh sleeve and analyzes the influence of axial length,helix angle,and mesh sleeve diameter on axial stiffness based on the spiral beam model of the steel wire.The results show that axial length and helix angle will significantly affect axial stiffness;The influence of boundary conditions was analyzed,and the results showed that the fixed boundary and the cyclic boundary of constrained radial displacement can be interchanged when calculating axial stiffness.Based on the conclusion of the stiffness analysis of the mesh sleeve,a sub mesh sleeve stiffness a-nalysis method based on contact relationship was proposed,explaining the nonlinear changes in ax-ial stiffness during stretching.A 2/N corrugated pipe spiral beam composite model and a 2/N sin-gle wave single spindle spiral beam composite model were further established for finite element cal-culation at different stiffness stages.The results of the example show that the force displacement curve obtained from simulation is in good agreement with the experimental curve,and the axial stiffness error in the high stiffness stage is 3.40％.
关键词
补偿器/轴向刚度/非线性/有限元
Key words
Compensator/Axial stiffness/Nonlinearity/Finite element analysis
维普
万方数据