Main shaft run-out research of hydraulic generator unit in load rejection process based on empirical mode decomposition
ZHANG Fei1, FU Jing2, FAN Yulin1, ZHOU Xijun1
1.Technology Center, State Grid Xinyuan Company Ltd., Beijing 100161, China; 2.Information Center, China Institute of Water Resources and Hydropower Research, Beijing 100044, China
Abstract:In order to solve the problem of calculating the peak-to-peak value in load rejection conditions, the research on peak-to-peak value differences between stable conditions and transient conditions has been conducted by time-domain wave characteristic analysis. Empirical mode decomposition me-thod was employed for run-out signal analysis in the load rejection process. The result indicates that for load rejection conditions the run-out signal can be decomposed into two different meaningful components. One component is shaft deviation which can be explained as the shaft orbit center stepping from previous stable point to the new stable point; the other component is random-high frequency pulsation. Further research on shaft deviation component shows that it consists of four stages with the speed variations. Accordingly, peak-to-peak value in load rejection mode can be viewed as the summation of peak-to-peak value of high-frequency pulsation and shaft deviation value. Effectiveness has been proved by case in the literature.
张飞, 付婧, 樊玉林, 周喜军. 基于EMD的水电机组甩负荷主轴摆度[J]. 排灌机械工程学报, 2017, 35(10): 863-868.
ZHANG Fei, FU Jing, FAN Yulin, ZHOU Xijun. Main shaft run-out research of hydraulic generator unit in load rejection process based on empirical mode decomposition. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(10): 863-868.
[1]朱传古,田桂岩,杨克,等. 水电厂主设备分析诊断策略[J]. 水电自动化与大坝监测, 2012, 36(5): 5-9. ZHU Chuangu, TIAN Guiyan, YANG Ke, et al. An analysis and diagnosis strategy for main equipment of hydropower plant[J]. Hydropower automation and dam monitoring, 2012, 36(5): 5-9.(in Chinese)[2]桂中华,孙慧芳,卢伟甫.抽水蓄能机组振摆保护与监测一体化系统研究[J]. 水电能源科学, 2016, 34(8): 177-179. GUI Zhonghua, SUN Huifang, LU Weifu. Vibration protection and monitoring integrative ssytem for pumped storage units[J]. Water resources and powers, 2016, 34(8): 177-179.(in Chinese)[3]张飞, 葛新峰, 潘罗平,等.稳态工况下水电机组主轴摆度峰峰值计算方法研究[J]. 振动与冲击, 2015, 34(21): 170-174. ZHANG Fei, GE Xinfeng, PAN Luoping, et al. Run-out peak-to-peak value calculation method of hydraulic unit shaft under stable conditions[J]. Journal of vibration and shock, 2015, 34(21): 170-174.(in Chinese)[4]刘凯华,张宇宁,冼海珍.水泵水轮机运行中的若干典型过渡过程[J].排灌机械工程学报, 2015, 33(10): 866-873. LIU Kaihua, ZHANG Yuning, XIAN Haizhen. Several typical transient processes of pump turbine[J]. Journal of drainage and irrigation machinery engineering, 2015, 33(10): 866-873.(in Chinese)[5]杨建东,胡金弘,曾威,等.原型混流式水泵水轮机过渡过程中的压力脉动[J].水利学报, 2016, 47(7): 858-864. YANG Jiandong, HU Jinhong, ZENG Wei, et al. Transient pressure pulsation of prototype francis pump-turbine[J]. Journal of hydraulic engineering, 2016, 47(7): 858-864.(in Chinese)[6]中国国家标准化管理委员会. GB/T28570-2012 水轮发电机组状态在线监测系统技术导则[S].北京: 中国标准出版社, 2012.[7]中国国家标准化管理委员会. GB/T 11348.1-1999 旋转机械转轴径向振动的测量和评定 第1部分:总则[S]. 北京: 中国标准出版社, 1999.[8]International Standard Organization. ISO 7919.1-1996 Mechanical vibration of non-reciprocating machines——Measurements on rotating shafts and evaluation criteria—Part 1: General guidelines[S]. International standard organization, 1996, 2nd edition[9]Huang N E, SHEN Z, LONG S R, et al. The empirical mode decomposition and Hilbert spectrum for non-linear and non-stationary time series analysis[C]//Procee-dings of the royal society a mathematical physics & engineering sciences, 1998.[10]焦卫东,蒋永华,林树森.基于经验模态分解的改进乘性噪声去除方法[J].机械工程学报, 2015, 51(24): 1-8. JIAO Weidong, JIANG Yonghua, LIN Shusen. Modified signal de-noising approach for multiplicative noise based on empirical mode decomposition[J]. Journal of mechanical engineering, 2015, 51(24): 1-8.(in Chinese)[11]朱文龙,周建中,肖剑,等.独立分量分析-经验模态分解特征提取在水电机组振动信号中的应用[J].中国电机工程学报, 2013, 33(29): 95-102 ZHU Wenlong, ZHOU Jianzhong, XIAO Jian, et al. An ICA-EMD feature extraction method and its application to vibration signals of hydroelectric generating units[J]. Proceedings of CSEE, 2013, 33(29): 95-102.(in Chinese)[12]郑近德,潘海洋,张俊,等.APEEMD及其在转子碰摩故障诊断中的应用[J].振动、测试与诊断, 2016, 36(2): 258-264. ZHENG Jinde, PAN Haiyang, ZHANG Jun, et al. Adaptive partly ensemble empirical mode decomposition and its application for rotor rubbing fault diagnosis[J]. Journal of vibration, measurement & diagnosis, 2016, 36(2): 258-264.(in Chinese)[13]张建伟,江琦,朱良欢,等.基于改进HHT的泵站管道工作模态辨识[J].农业工程学报, 2016, 32(2): 71-76. ZHANG Jianwei, JIANG Qi, ZHU Lianghuan, et al. Modal parameter identification for pipeline of pumping station based on improved Hilbert-Huang transform[J]. Transactions of the CSAE, 2016, 32(2): 71-76.(in Chinese)[14]HUANG N E. An adaptive data analysis method for nonlinear and nonstationary time series: the empirical mode decomposition and Hilbert spectral analysis[M]//Wavelet Analysis And Applications, Basel: Birkhauser. 2006: 363-376.