发电机转子小齿裂纹的超声回波特性及在机检测方法

doi:10.3901/JME.2024.08.011

摘要/Abstract

摘要： 发电机转子小齿在护环约束下具有极高的预应力，然而由于其频繁启停的特性使得电机转速变化进而致使护环离心力改变最终引起小齿齿根的交变集中应力，因而小齿齿根的疲劳裂纹是不拔环条件下发电机检测的重要内容。针对护环-小齿双层结构下小齿裂纹反射回波特性不明、信号衰减严重、检测精度低的问题，基于超声有限元声学仿真手段，探究了不同几何特征下裂纹的超声回波特性，确认了超声信号的产生机理及演变规律，构建了表征裂纹有无的尾波指标；进而规划了超声裂纹检测的扫描与判定准则，最后通过自搭建的小齿-护环高保真模拟结构试验台验证了该方法对模拟裂纹状态定性及定位检测的有效性，从而为发电机转子小齿内部裂纹缺陷的超声原位快速检测提供了一种新的思路。

关键词: 疲劳裂纹, 无损检测, 超声, 裂纹状态

Abstract: The small teeth of the generator rotor have extremely high prestress under the restraint of the retaining ring. However, because of its frequent start and stop, the centrifugal stress of the retaining ring changes with the rotation speed, which causes the alternating concentrated stress of the tooth root of the small tooth. Therefore, the fatigue crack of the small tooth root is an important concern of the regular inspection of the generator. Shooting at the problems including the unknown reflection echo characteristics, serious signal attenuation and low detection accuracy of the small tooth crack under the l retaining-ring double-layer structure, the ultrasonic echo characteristics of cracks with different geometrical characteristics are explored through the finite element acoustic simulation model, the generation mechanism and evolution law of ultrasonic signal are confirmed and the coda index characterizing the existence of cracks is constructed. Correspondingly, the scanning strategy and the judging criteria for the ultrasonic-based crack detection are figured out. Eventually, the effectiveness of the method for the qualitative and localization detection of simulated cracks is verified by a small tooth-retaining ring simulation bench. This method provides a new way for the in-situ rapid detection of cracks in small teeth of generator rotors.

Key words: fatigue crack, non-destructive testing, ultrasound, crack state

中图分类号:

TH17

梁鹏, 赵文卓, 武通海, 冉毅. 发电机转子小齿裂纹的超声回波特性及在机检测方法[J]. 机械工程学报, 2024, 60(8): 11-21.

LIANG Peng, ZHAO Wenzhuo, WU Tonghai, RAN Yi. Ultrasonic Echo Characteristics and On-machine Detection Method of Small Tooth Cracks in Generator Rotors[J]. Journal of Mechanical Engineering, 2024, 60(8): 11-21.

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http://www.cjmenet.com.cn/CN/Y2024/V60/I8/11

参考文献

[1] И.П.苏沃洛夫，江枫，郭顺全，等. 氢冷却汽轮发电机的运行[M]. 北京：电力工业出版社，1957. И.П.Suvorov，JIANG Feng，GUO Shunquan，et al. Operation of hydrogen cooling turbo-generator[M]. Beijing：Electric Power Industry Press，1957.
[2] 熊家驹，赵昌宗. 东方300MW水-氢-氢汽轮发电机结构介绍[J]. 东方电气评论，1987，1(1)：34-56，90. XIONG Jiaju，ZHAO Changzong. Introduction to the structure of 300MW water-hydrogen-hydrogen steam turbine generator[J]. Dongfang Electric Review，1987，1(1)：34-56，90.
[3] 王兵. 发电机氢冷系统常见问题及处理探究[J].中外企业家，2019，20：132. WANG Bing. Research on common problems and treatment of generator hydrogen cooling system [J]. Chinese and Foreign Entrepreneur，2019，20：132.
[4] 国家能源局公告2019年第4号. DL/T 1766.3-2019. 水氢氢冷汽轮发电机检修导则第3部分：转子检修[S]. 北京：中国标准出版社，2019. National Energy Administration Bulletin No.4(2019). DL/T 1766.3-2019，Maintenance guidelines for water-hydrogen-cooled turbo-generators Part 3：Rotor maintenance[S]. Beijing：Standards Press of China，2019.
[5] NSENGIYUMVA W，ZHONG S，LIN J，et al. Advances，limitations and prospects of nondestructive testing and evaluation of thick composites and sandwich structures：A state of the art review[J]. Composite Structures，2021，256：112951.
[6] OMAR M A. Nondestructive testing methods and new applications[M]. Shanghai：Intech，2012.
[7] 邓其林. 渗透探伤机理及工艺探讨[J]. 无损检测，1992，14(3)：71-74. DENG Qilin. The mechanism and technology of penetrant inspection[J]. Nondestructive Testing，1992，14(3)：71-74.
[8] 周兆，白海龙，张泽彪，等. 荧光渗透法无损检测的原理与应用[J]. 实验科学与技术，2009，7(1)：50-53. ZHOU Zhao，BAI Hailong，ZHANG Zebiao，et al. Principle and application of non-destructive testing by fluorescence penetrant method[J]. Experimental Science and Technology，2009，7(1)：50-53.
[9] 王赫，白素平，闫钰锋. 荧光渗透探伤裂纹长度测量技术研究[J]. 长春理工大学学报，2021，44(1)：22-27. WANG He，BAI Suping，YAN Yufeng. Research on crack length measurement technology of fluorescent penetrant inspection[J]. Journal of Changchun University of Science and Technology，2021，44(1)：22-27.
[10] 中国机械工程学会. 磁粉探伤[M]. 北京：机械工业出版社，1987. Chinese Mechanical Engineering Society. Magnetic particle inspection[M]. Beijing：China Machine Press，1987.
[11] FUKUOKA K，HORIIKE S. Measurement of magnetic particle for quantitative evaluation in magnetic particle testing[J]. International Journal of Applied Electromagnetics & Mechanics，2016，52(3)：1-8.
[12] LI L，YANG Y，CAI X，et al. Investigation on the formation mechanism of crack indications and the influences of related parameters in magnetic particle inspection[J]. Applied Sciences，2020，10(19)：6805.
[13] 日本无损检测协会. 射线探伤[M]. 北京：机械工业出版社，1988. Japan Nondestructive Testing Association. Radiographic inspection[M]. Beijing：China Maohine Press，1988.
[14] HAMMAR L，WIRDELIUS H. Development of a high resolution X-ray radiographic technique，optimized for onsite testing in radioactive environments[J]. VTT Symposium，2004，237：88-99.
[15] DWIVEDI S，VISHWAKARMA M，SONI A. Advances and researches on non destructive testing：A review[J]. Materials Today Proceedings，2018，5(2)：3690-3698.
[16] 郑晖，林树青. 超声检测[M]. 2版. 北京：中国劳动社会保障出版社，2008. ZHENG Hui，LIN Shuqing. Ultrasonic testing[M]. 2nd ed. Beijing：China Labor and Social Security Press，2008.
[17] 李靖，马羽宽. 超声探伤法[M]. 广州：广东科技出版社，1981. LI Jing，MA Yukuan. Ultrasonic flaw detection method [M]. Guangzhou：Guangdong Science and Technology Press，1981.
[18] 朱晓恒，高晓蓉，王黎，等. 超声探伤技术在无损检测中的应用[J]. 现代电子技术，2010(21)：120-124. ZHU Xiaoheng，GAO Xiaorong，WANG Li，et al. Application of ultrasonic flaw detection technology in nondestructive testing [J]. Modern Electronic Technology，2010(21)：120-124.
[19] 中国机械工业联合会. EN ISO 10863-2011，非破坏性焊接试验. 超声检测. 飞行时间衍射技术(TOFD)的使用[S]. 北京：中国标准出版社，2021. China Machinery Industry Federation. ENISO 10863-2011，non-destructive welding test. Ultrasonic examination. The use of time-of-flight diffraction (TOFD) [S]. Beijing：Standards Press of China，2021.
[20] SCHABOWICZ K. Ultrasonic tomography-the latest nondestructive technique for testing concrete members-description，test methodology，application example[J]. Archives of Civil & Mechanical Engineering，2014，14(2)：295-303.
[21] CARVALHO A，REBELLO J，SOUZA M，et al. Reliability of non-destructive test techniques in the inspection of pipelines used in the oil industry[J]. International Journal of Pressure Vessels & Piping，2008，85(11)：745-751.
[22] 陈勇，韦玉屏. 槽形缺陷对超声波反射当量的研究[J]. 机械设计与制造，2005(9)：101-103. CHEN Yong，WEI Yuping. Study on the ultrasonic reflection equivalent of groove defects[J]. Mechanical Design and Manufacture，2005(9)：101-103.
[23] 黄双福. 超声波A扫探伤中缺陷智能识别的若干关键技术研究[D]. 福州：福州大学，2013. HUANG Shuangfu. Research on several key technologies of intelligent defect recognition in ultrasonic A-scan flaw detection [D]. Fuzhou：Fuzhou University，2013.
[24] SHIRAHATA H，MIKI C，YAMAGUCHI R，et al. Fatigue crack detection by the use of ultrasonic echo height change with crack tip opening[J]. Welding in the World，2014，58(5)：681-690.
[25] WU H，XIA H，LIU G，et al. Numerical analysis and research on rectangular crack detection of basin insulator based on laser ultrasonic[C/CD]// Conference on Frontier Academic Forum of Electrical Engineering，2021.
[26] OYA T，UCHIMURA M. Rotor tooth crack inspection method：Japan，WO2019225003A1[P]. 2019-11-28.
[27] PAN Q，LI S，XU L，et al. Research on nonlinear ultrasonic testing technology of microcracks in metallic materials[C/CD]// 2021 IEEE International Conference on Mechatronics and Automation(ICMA). IEEE，2021.
[28] 邹来胜. 航空叶片涂层厚度分布超声测量方法研究[D]. 西安：西安交通大学，2021. ZOU Laisheng. Research on ultrasonic measurement method of coating thickness distribution of aerospace blades[D]. Xi’an：Xi’an Jiaotong University，2021.
[29] 崔西明，王哲，张卓，等. 表面粗糙度对压电超声测厚的影响[J]. 无损检测，2016(5)：1-4. CUI Ximing，WANG Zhe，ZHANG Zhuo，et al. Influence of surface roughness on piezoelectric ultrasonic thickness measurement[J]. Nondestructive Testing，2016(5)：1-4.