摘要
深海油气管道连接器的结构参数直接影响其密封性能,因而对连接器进行密封机理分析与结构参数优化研究具有重要的意义。为此,首先分析了金属接触静密封的形成机理,建立了连接器形成可靠密封的临界条件;基于接触力学推导出临界弹塑性接触压力均值的计算公式,并计算出219 mm连接器的临界值为370 MPa;应用ANSYS参数化设计语言（ANSYS Parametric Design Language,APDL）,对连接器的结构参数进行了灵敏度分析,确定了影响密封性能的5个关键结构参数。进而以主、次密封面上的接触压力方差为2个目标,以主、次密封面上的接触压力均值和最大塑性应变为约束变量,运用多目标遗传算法（Multi-Objective Genetic Algorithm,MOGA）对连接器进行了优化设计,结果表明：接触压力方差显著减小,接触压力均值大于370 MPa,塑性应变较小。最后对优化前后的深海管道连接器进行了水压和拉伸试验,结果表明：优化之后的连接器承受水压能力大于设计极限压力18 MPa,承受轴向拉力大于7.0×10-5 N。该方法对于其他尺寸深海管道连接器的设计具有参考价值。
The structural parameters of a deepwater pipeline connector have significance to analyze the sealing mechanism of the connector and optimize static metal contact was analyzed, and the critical condition for the formation a direct effect on its sealing performance, so it is of great its structural parameters. Firstly, the sealing mechanism of of reliable seal in the connector was established. Secondly, the formula for calculating the mean critical elastic-plastic contact pressure was derived according to contact mechanics, And based on the formula, the critical value of the connector with 219 mm in external diameter was calculated to be 370 MPa. Thirdly, the sensitiv- ity analysis was performed on the structural parameters of the connector by using ANSYS Parametric Design Language （APDL）, and five key parameters affecting its sealing performance were confirmed. Fourthly, the connector was optimized and designed by using the Multi-Objective Genetic Algorithm （MOGA） with the contact pressure variances on major and minor sealing surfaces as two objectives, and the mean contact pressure and maximum plastic strain on them as constraint variants. It is shown that after the optimization design, the contact pressure variances decrease significantly, the mean contact pressure is higher than 370 MPa, and the plastic strain is small. Finally, water pressure and tension tests were performed on the deepwater pipeline connector before and after optimization. It is indicated that the bearable axial tension of the optimized connector is higher than 7.0x 10^5 N and its water pressure bearing capacity is higher than the designed ultimate pressure （18 MPa）. This method provides a reference for the design of deepwater pipeline connectors of other sizes.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2016年第8期116-123,共8页
Natural Gas Industry
基金
国家自然科学基金项目"新型海底管道卡压式机械连接器密封机理与多目标优化研究"(编号:51279042)
关键词
深海油气管道
连接器
密封机理
临界条件
接触压力
方差灵敏度
多目标优化设计
极限水压
Deepwater oil and gas pipeline
Connector
Sealing mechanism
Critical condition
Contact pressure
Variance sensitivity
Multi-objective optimization design
Ultimate water pressure
