凯夫拉纤维增强型挠性接管管体变形检测方法及数值分析

Deformation detection method and numerical analysis of filament-wound flexible pipe

[目的]为了研究凯夫拉纤维增强型挠性接管(FW-FP)管体发生局部异常变形而引发管体破裂失效的问题,[方法]提出一种基于电阻检测原理的管体变形检测方法,通过传感器缠绕模型的设计,分析管体3种变形状态。运用建立的基准阈值模型,对典型的DN100挠性管体进行数值计算分析。[结果]结果表明,管体局部异常变形引起电路电流的变化量可达0.25A,而管体正常变形引起电路电流的变化量可忽略不计。[结论]所提方法可有效识别管体上的局部异常变形,并可排除正常变形带来的信号干扰。该检测方法得到的结果可为后续评估此类挠性接管管体使用寿命提供依据。

[Objectives]This paper aims at solving the problem of pipe body failure by the local abnormal deformation of Filament-Wound Flexible Pipe (FW-FP).[Methods] A method of monitoring the deformation of the pipe body on the basis of the principle of resistance detection is proposed. By optimizing the design of the sensor winding model,the three kinds of deformation state of the pipe body are analyzed, a reference threshold model established and a typical DN100 flexible pipe used for numerical calculation and analysis.[Results]The current variation of circuits caused by local abnormal deformation can reach 0.25 A,but the current variation of circuits caused by normal deformation is negligible.[Conclusions]It is proven that this method can effectively identify the local abnormal deformation of FW-FP and eliminate the signal interference caused by normal deformation. The results of this study can provide references for the follow-up service life evaluation of FW-FP.