低阶扭转模态电磁声阵列传感器研制及其在厚壁小径管中的试验研究

发布时间：2018-12-09 20:29

【摘要】：管道检测是发电厂热力设备安全的重要问题,由于高温以及检测区域的限制,常规无损检测方法很难满足电站管道检测要求。低阶扭转T(0,1)模态导波,由于其非频散特性,对管道缺陷大范围检测十分有效。为在管道中实现非接触激励T(0,1)模态,设计并研制了一种电磁声阵列传感器。利用所研制的电磁声阵列传感器,实现了厚壁小径管中T(0,1)模态激励和接收。通过优化电磁声阵列传感器各元件间不同连接方式可知,当各元件并联连接时,不仅提高了所激励信号的能量,还抑制了其它模态产生。同时测试了电磁声阵列传感器的频率特性,并对有周向人工缺陷的样管进行检测。试验结果表明,该电磁声阵列传感器可以实现对样管中周向缺陷的检测与准确定位,为在管道中激励接收T(0,1)模态并实现非接触检测缺陷奠定了基础。
[Abstract]:Pipeline detection is an important problem in the safety of thermal equipment in power plant. Due to the limitation of high temperature and testing area, conventional nondestructive testing methods are difficult to meet the requirements of pipeline inspection in power plants. The low-order torsional T _ (0 ~ (1) mode guided wave is very effective for the detection of pipeline defects in a wide range due to its non-dispersive characteristics. In order to realize the non-contact excited T _ (0 ~ 1) mode in a pipeline, an electromagnetic acoustic array sensor is designed and developed. Using the developed electromagnetic acoustic array sensor, the T _ (0 ~ (1) mode excitation and reception in a thick-walled small diameter tube are realized. By optimizing the different connection modes between the various elements of the electromagnetic acoustic array sensor, it is known that when each element is connected in parallel, not only the energy of the excited signal is increased, but also other modes are restrained. At the same time, the frequency characteristic of electromagnetic acoustic array sensor is tested, and the sample tube with circumferential artificial defect is tested. The experimental results show that the electromagnetic acoustic array sensor can detect and locate the circumferential defects in the sample tube accurately, which lays a foundation for exciting and receiving T _ (0 ~ (1) mode in the pipeline and realizing the non-contact detection of defects.
【作者单位】：北京工业大学机械工程与应用电子技术学院;华北电力科学研究院有限责任公司;
【基金】：国家自然科学基金(51235001,11272017) 北京市自然科学基金(1122005) 质检公益性行业科研专项(201210080)资助项目
【分类号】：TP212;TM621

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