| 季昌国,余超.在役枞树型叶根原位相控阵超声检测技术*[J].,2021,40(6):946-956 |
| 在役枞树型叶根原位相控阵超声检测技术* |
| In-situ phased array ultrasonic testing technology of in-service fir tree leaf roots |
| 投稿时间：2021-05-27 修订日期：2021-11-02 |
| 中文摘要: |
| 本文是利用相控阵超声检测成像技术对枞树型叶根进行全覆盖检测系列文章的第二篇。根据检测工艺制作人工缺陷参考试块对叶根不同区域缺陷的检测覆盖和检测灵敏度进行验证研究，并与CIVA模拟缺陷信号结果进行对比。首先采用文章Ⅰ得出的全覆盖检测工艺进行相控阵超声检测实验，针对叶根检测空间受限设计了夹具对探头进行控制，保证了耦合与检测结果的重复性，实现叶根检测数据与检测位置的对应。检测结果表明：(1)叶根内、外弧缺陷相控阵检测数据成像与Civa仿真缺陷模拟检测结果基本一致，说明利用三维扫描尺寸建模和声学仿真模拟软件可有效解决不同规格枞树型叶根全覆盖检测工艺开发难题；(2)根据相控阵检测数据S视图和A视图，结合叶根截面外形结构图可有效判别叶根各截面第1齿根处的缺陷，实现了叶根相控阵全覆盖检测；(3)按照该相控阵组合检测工艺检测出的缺陷信号信噪比高，定位精准，能有效实现在役叶根原位检测。研究结果对相控阵超声技术在汽轮机叶根在役检测工程应用具有较大的参考价值。 |
| 英文摘要: |
| ：The work of this series of articles is to use phased array ultrasound testing (PAUT) to detect the roots of fir-tree leaves. This article is the second in a series of articles. According to the inspection process, artificial defect reference test blocks are made to verify the detection coverage and detection sensitivity of different areas of leaf roots, and compare with the results of CIVA simulated defect signals. First, the PAUT experiment was carried out using the full coverage testing process obtained in Article Ⅰ. In view of the limited space for leaf root detection, an automatic detection device and fixture are developed to control the probe, which ensures the coupling and repeatability of the detection results, and realizes the correspondence between the detection data of the leaf root and the detection position. The test results show that: 1. The phased array detection imaging map signal of the leaf root inner and outer arc defects is basically consistent with the Civa simulation defect simulation detection results, indicating that the use of 3D scanning size modeling and acoustic simulation software can effectively solve the development problem of the detection process of fir tree-shaped leaf roots of different specifications.; 2. According to the S view and A view of phased array inspection data , combined with the shape and structure drawing of the root section, the defects at the first tooth root of each section of the root can be effectively identified, and the root phase control is realized Array full coverage inspection; 3. The defect signal detected by the phased array combined detection process has a high signal-to-noise ratio and accurate positioning, which can effectively solve the problem of limited space for blade root in-service detection. The research results have great reference value for the engineering application of phased array ultrasound imaging in the in-service inspection of steam turbine blade roots. |
| DOI：10.11684/j.issn.1000-310X.2021.06.018 |
| 中文关键词: 枞树型叶根 在役检测 全覆盖检测 相控阵超声 信噪比 |
| 英文关键词: Steam turbine fir tree root in-service inspection full coverage inspection phased array ultrasound testing signal-to-noise ratio |
| 基金项目:华北电力科学研究院有限责任公司自有资金科技项目 |
|
| 摘要点击次数: 660 |
| 全文下载次数: 515 |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
