目的 为了对航天管路柔性接头的结构进行优化,利用仿真模拟的手段,对密封圈的预压缩量、密封槽深度、密封槽倒角进行优化,并对优化后的结构进行不同液压及偏转角度下的密封性研究。方法 首先,通过迭代优化的处理方式,并利用Abaqus软件进行有限元仿真（FEM）,依次对密封圈的预压缩量、密封槽深度、密封槽倒角等结构参量进行优化处理,并采用响应面法（Response Surface Methodology, RSM）对优化后的结构参量进行再次寻优处理,从而得出一组最优的结构参量。最后,在最优结构参量下对柔性接头进行极限耐压测试,对其不同液压下的密封性规律进行研究,并对其不同偏转角度下的密封性规律进行研究分析。结果 进行了多目标优化研究,得出了一组柔性接头最优的结构参数,对于极限耐压的研究,仿真结果表明,当液压超过3.6 MPa后,柔性接头将出现损伤,在所研究的偏转角度（柔性接头可实现的全部角度）下,密封圈表面最大接触应力均大于液压,密封性能良好。结论 本研究为进一步优化航天用管路柔性接头提供了思路和方法。通过仿真的手段,可以更有效地对柔性接头的结构进行优化,并对柔性接头在不同液压及偏转角度下的密封性规律进行了研究,从而为多工况柔性接头密封性规律分析提供了指导。
Abstract
To optimize the structure of the flexible joint for aerospace piping, the work aims to optimize the pre-compression amount of the sealing ring, the depth of the sealing groove, and the chamfer of the sealing groove with simulation methods, and conduct a study on the sealing performance of the optimized structure under different hydraulic pressures and deflection angles. Firstly, through iterative optimization processing, the Abaqus software was used for finite element simulation (FEM) to successively optimize the structural parameters such as the pre-compression amount of the sealing ring, the depth of the sealing groove, and the chamfer of the sealing groove, and the response surface method (RSM) was applied to re-optimize the optimized structural parameters, thereby obtaining a set of optimal structural parameters. Then, extreme pressure resistance tests were conducted on the flexible joint under the obtained optimal structural parameters and the sealing laws under different hydraulic pressures and different deflection angles were studied and analyzed. Through multi-objective optimization research, a set of optimal structural parameters for the flexible joint was obtained. For the study on extreme pressure resistance, the simulation results showed that when the hydraulic pressure exceeded 3.6 MPa, the flexible joint would be damaged. Under the deflection angles studied (all angles that the flexible joint could achieve), the maximum contact stress on the sealing ring surface was greater than the hydraulic pressure, and the sealing performance was good. This study provides ideas and methods for further optimizing the flexible joint for aerospace use. Through simulation methods, the structure of the flexible joint can be optimized more effectively, and the sealing laws of the flexible joint under different hydraulic pressures and deflection angles have been studied, thereby providing guidance for the analysis of sealing laws of flexible joints under multiple working conditions.
关键词
航天管路连接 /
柔性接头 /
O型密封圈 /
有限元仿真 /
响应面法
Key words
aerospace pipeline connection /
flexible joint /
O-ring /
finite element simulation /
response surface methodology
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基金
国家自然科学基金（52175337,52192591）
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