一种梁式管接头密封性能与结构参数敏感性分析

Sealing Performance and Sensitivity Analysis of Structure Parameters for a New Beam Seal

梁式管接头具有耐高压、自紧性和自封性等优点,在航空液压系统中有着广阔的应用前景。设计提出了一种带有椭圆形凹槽的梁式管接头阴接头结构,建立了该型梁式管接头的弹塑性有限元接触模型,数值模拟得到该结构能够形成两道有效密封。以最大接触压力为密封性能评价指标的分析表明,管内流体压力具有提高梁式管接头密封性能的作用,且施加的预紧力存在一个最佳设计值。该型梁式管接头阴、阳接头配合面在不同预紧力下的接触带宽试验结果与数值模拟结果吻合较好,验证了有限元模型和分析方法的有效性。进而,采用正交试验对梁式管接头的主要结构参数进行分析,利用极差法得到了结构参数对两道密封带密封性能影响的敏感性。结果表明,椭圆形凹槽的长轴和短轴,第一道密封的名义接触带宽与U形梁截面宽度对带有椭圆形凹槽的梁式管接头密封性能有显著影响。

The beam seal has a broad application prospect in the aviation hydraulic system due to its high-pressure resistance, self-tightening and self-sealing features. A type of female joint structure with elliptical groove is proposed. The elastic-plastic finite element contact model of the beam seal is established. The analysis with the maximum contact pressure as the evaluation index of sealing performance shows that the fluid pressure in the pipe can improve the sealing performance of the beam seal, and there is an optimal design value for the applied pre-tightening force. The experimental results of the contact bandwidth on the mating surfaces of the female and male joints under different pre-tightening force are in good agreement with the numerical simulation, which verifies the effectiveness of the finite element model and analysis method. Furthermore, the main structural parameters of the beam seal are analyzed by orthogonal array method, and the sensitivity of the structural parameters to the sealing performance of the two sealing is obtained by the range method. It is found that the long and short axis of the elliptical groove, the nominal contact bandwidth of the first seal and the section width of the U-shaped beam have significant influence on the sealing performance of the beam seal.