K型井架起升及倾斜的随机有限元可靠性分析

Reliability analysis of K type derrick raising and tilting based on stochastic finite element method

井架起升的过程以及井架使用中出现的倾斜都是十分危险的作业工况,极易出现井架拉弯载荷导致的应力集中,造成井架安全性及可靠性的下降。针对以上问题,选取JJ170/41-K等5种不同型号的K型井架建立其起升过程及倾斜状态下的力学分析模型,采用随机有限元方法在Visual Studio平台上实现了对其力学特性、参数敏感性以及可靠性的分析。计算得到了井架起升过程中的应力、位移分布及其可靠性评估曲线,并得到了井架倾斜工况下的重要影响变量。研究表明:所开发的分析平台操作简便,可靠性参数计算结果的精度较高。

The raising and tilting of derrick are very dangerous operating modes.Tensile and bending loadings would tend to stress concentration,which may affect the safety and reliability of the derrick.To resolve these problems,mechanical analysis model of derrick raising and tilting was established for 5different type derricks,including JJ170/41-K type derrick.Reliability finite element method was employed to study the mechanical properties,sensitively and reliability analysis on Visual Studio platform.The stress and displacement distributions of different type derricks were obtained,and reliability evaluation curve was plotted.Major influence factors in derrick tilting mode was obtained.Results show that the developed software is user-friendly and the calculated results of reliability parameters are accurate.