摘要
目前水轮发电机组中的转轮叶片裂纹故障仍广泛采用振动监测方法进行间接测量,通过振动频谱中转频的倍频成分进行故障判断,但这种方法并不十分有效。介绍了声发射技术用于检测水轮机转轮叶片裂纹的可行性。分析水轮机不同运行工况叶片裂纹声发射信号与轮叶片裂纹发展过程的关系,同时将测得的声发射信号与同期的振动信号进行比较。实验结果表明,与振动检测方法相比声发射检测更容易检测到初期的转轮叶片裂纹故障。
Vibration diagnosis still remains the most widely used method for indirectly detecting vane cracking in hydraulic power generation turbines with spectral components at exactly multiples of rotating frequency, but this method is not very effective. In light of this, the paper presented results of an investigation to assess the feasibility of the acoustic emission technology for detecting vane cracking in hydraulic turbine. The relationship between AE signals and vane cracking under different running conditions were analyzed. At the same time, the AE signals with vibration signals were compared, which were obtained simultaneously. The experimental results revealed that the Acoustic Emission method detect incipient vane cracking easier than vibration detection.
出处
《电网与清洁能源》
2009年第4期58-60,共3页
Power System and Clean Energy
关键词
水轮机组
声发射技术
叶片裂纹
hydroelectric units
AE technology
vane cracking
