升降速过程中滑动轴承声发射信号特征研究.pdfVIP

第5O卷第3期 汽 轮 机 技 术 V01．5O No．3 2008年6月 TURBINE TECHNOLOGY Jun．2008 升降速过程中滑动轴承声发射信号特征研究 黄 琪，李录平，晋风华，余 波，叶飞飞 (长沙理工大学能源与动力工程学院，湖南长沙，410076) 摘要：用理论分析方法和实验方法研究滑动轴承声发射信号特征随转子转速的变化规律。研究表明，滑动轴承的 声发射信号特征参数(时域波形，事件计数率，频率中心等)随转速的变化而变化。润滑状态较好时，幅值、事件计 数率、频率中心较小；润滑状态变差时，幅值、事件计数率、频率中心都增大，且声发射脉冲信号明显。研究结果对 诊断滑动轴承在转子升降速过程的润滑状态及其故障提供了参考依据。 关键词：滑动轴承；声发射；运行状态 分类号：TK263．6+4 文献标识码：A 文章编号：1001—5884l2008)03-0214-03 Study on Acoustic Emission Characteristics of the Sliding Bearing in the Process of Start．uD and Shut．down HUANG Qi，LI Lu-ping，JIN Feng-hua，YU Bo，YE Fei-fei (Changsha University of ScienceTechnology，Changsha 4 1 0076，China) Abstract：Through theory analysis and experiment validation，the variation law of the acoustic emission characteristics of sliding bearing with speed change was studied in this paper．Study results show that the acoustic emission characteristic pa— rameters(time domain waveform，event count rate，and fequency center，and SO on)change with the rotational speed vail— ation．Under the fully—sliding condition，the value of amplitude，event count rate and frequency center are small，when poor condition appea~，the value of amplitude，event count rate and fequency center are bigger，and clear pulse phenome— non of AE signal can be observed．Finally，the research result of this paper provides reference for identifying the condition of sliding bearing lubrication and failure in the process of start—up and shut—down、 Key words：sliding bearing；acoustic emission；operation s~tus 应力波释放能量，产生声发射信号。在转子的升速和降速过 0 前 言 程中，滑动轴承的油膜状态发生剧烈变化，极易引起轴承故