长跨度热力管道的裂纹识别

Crack Detection of Long-span Heating Pipelines

为了实现管道运行状态和表面裂纹的定期监测,确保长跨度热力管道设施的安全性能和使用性能,对长跨度热力管道的裂纹识别进行连续小波变换研究;推导大跨度热力管道的运动微分方程并建立有限元模型,计算系统位移响应和角度响应,通过连续小波变换分析系统的响应信息研究裂纹识别。结果表明:连续小波变换裂纹识别能力较强,可以精准定位裂纹位置和判断裂纹大小,利用角度响应识别裂纹比利用位移响应识别更有效;管道中流体流速越大,裂纹识别效果越好。

To monitor the status and detect the damages regularly,thus ensure the safety performance and working performance of long-span heating pipelines,the continuous wavelet transform was applied to study the crack recognition of long-span heating pipelines.The dynamic equation was derived and finite element model of long-span thermal pipeline was established.The displacement and angle responses of the system were computed.The response information of the system was then processed for crack identification by using the continuous wavelet transform.The results show that the continuous wavelet transform is powerful in crack identification,which can locate crack position accurately and judge crack strength precisely.The crack identification using angular response is more effective than using displacement response.The greater the velocity of flow in the pipeline is,the better the crack identification results are.