升降速过程中滑动轴承声发射信号特征研究  

Study on Acoustic Emission Characteristics of the Sliding Bearing in the Process of Start-up and Shut-down

作　　者：黄琪[1] 李录平[1] 晋风华[1] 余波[1] 叶飞飞[1] 

机构地区：[1]长沙理工大学能源与动力工程学院,湖南长沙410076

出　　处：《汽轮机技术》2008年第3期214-216,219,共4页Turbine Technology

基　　金：湖南省自然科学基金资助项目(编号:06JJ20040);大唐湖南分公司科技项目(石门电厂300MW汽轮发电机组轴承负荷分配研究);长沙理工大学博士基金的资助

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。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 parameters （time domain waveform, event count rate, and frequency center, and so on） change with the rotational speed variation. Under the fully-sliding condition, the value of amplitude, event count rate and frequency center are small, when poor condition appears, the value of amplitude, event count rate and frequency center are bigger, and clear pulse phenomenon 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,

关 键 词：滑动轴承 声发射 运行状态 

分 类 号：TK263.64[动力工程及工程热物理—动力机械及工程]