新型梁式管接头的密封性能分析与结构优化设计

SEALING PERFORMANCE ANALYSIS AND STRUCTURAL OPTIMIZATION DESIGN OF NEW BEAM SEAL

为了提高梁式管接头的密封性能,以梁式管接头的结构参数为设计变量,对其进行优化设计。首先,建立了带有椭圆弧凹槽的梁式管接头的有限元模型;其次,以密封接触表面的最大接触压力为密封性能的定量指标,对影响梁式管接头密封性能的五个结构参数进行敏感性分析,选取影响效果显著的结构参数建立二阶响应面模型;最后,利用遗传算法对响应面模型进行多目标优化求解,并通过有限元数值模拟验证了优化结果的有效性。结果表明,椭圆长半轴、椭圆短半轴和第一道密封名义宽度这三个参数对梁式管接头密封性能的影响更为显著,当三者的值分别取为1.051 mm、0.540 mm和0.060 mm时,梁式管接头的密封性能能够得到有效提高。

In order to improve the sealing performance of the beam seal,the structural parameters of the beam seal were used as design variables,and the optimization design was carried out.Firstly,a finite element model of the beam seal with elliptical arc groove was established.Secondly,taking the maximum contact pressure of the sealing contact surface as a quantitative indicator of sealing performance,the sensitivity analysis of five structural parameters that affect the sealing performance of the beam seal was carried out,and the structural parameters with significant effects were selected to establish a second-order response surface model.Finally,the genetic algorithm was used to solve the multi-objective optimization of the response surface model,and the effectiveness of the optimization results was verified by the finite element numerical simulation.The results show that the three parameters of the ellipse semi-major axis,the elliptic semi-minor axis and the nominal width of the first seal have a more significant impact on the sealing performance of the beam seal.When the three values are taken as 1.051 mm,0.540 mm and 0.060 mm respectively,the sealing performance of the beam seal can be effectively improved.