基于应变模态分析的长输油气管线损伤检测仿真研究
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摘要
基于应变模态方法,运用有限元分析软件ANSYS对石油工业中的压力管道损伤识别进行了初步的研究。ANSYS的模态分析可以求得结构在损伤前后的位移模态,将其转换为对应阶数的应变模态,并对比应变模态损伤前后的变化,作出应变模态差值曲线以此来判断损伤的存在和位置以及损伤程度。计算结果表明:利用应变模态差值曲线能比较准确地识别出管道结构模型的损伤存在和损伤位置,并依此定性地识别出管道结构模型的损伤程度。采用此方法进行管道结构进行损伤识别比传统的损伤检测方法更加准确、方便。
Based on the method of strain mode,the damage identification of a beam model of pipeline structures is studied via the finite element analysis software ANSYS.The displacement model responding the normal and damaged cases are obtained by the model analysis of the ANSYS.The change of the strain model is studied in order to estimate the existence and location even the extent of the damage.The result show that the damage existence and the position of the pipeline model can be accurately identified by the difference curve of the strain mode;and the laws that the peak values of strain mode increase with the element damage degree of the pipeline beam model can be used to detect the damage degree of the pipeline model.The strain model analysis method is more accuracy and continent compared the other traditional methods in the damage detections of the engineering structures.
Based on the method of strain mode,the damage identification of a beam model of pipeline structures is studied via the finite element analysis software ANSYS.The displacement model responding the normal and damaged cases are obtained by the model analysis of the ANSYS.The change of the strain model is studied in order to estimate the existence and location even the extent of the damage.The result show that the damage existence and the position of the pipeline model can be accurately identified by the difference curve of the strain mode;and the laws that the peak values of strain mode increase with the element damage degree of the pipeline beam model can be used to detect the damage degree of the pipeline model.The strain model analysis method is more accuracy and continent compared the other traditional methods in the damage detections of the engineering structures.
引文
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[3]杨景义,王信义.试验模态分析[M].北京:北京理工大学出版社,1990.
[4]陈安宁等.振动模态分析技术[M].北京:国防工业出版社,1993.
[5]李德葆,陆秋海.实验模态分析及其应用[M].北京:科学出版社,2001.
[6]任权,李洪升,等.基于应变模态变化率的压力管道无损检测[J].大连理工大学学报,2001,41(6):648-652.
[7]杜思义,陈淮.基于应变模态法识别刚架桥梁的损伤[J].世界地震工程,2003,19(2):112-115.
[8]张敦福,王锡平,等.悬臂输送管道流-固耦合动力学系统的直接解法[J].机械工程学报,2004,40(3):195-198.
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[10]陆秋海,周舟,等.结构应变模态辨识的特征系统实现方法[J].机械强度,2004,26(1):1-5.
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