The abrupt change informatiom can be obtained through decomposing and reconstruction of the vibrating signal by wavelet packet ; therefore the fault condition of the hydro - generator unit can confirm and provide decision support for diagnosing the vibration fault of the unit 运用小波包分析对振动信号进行分解与重构，可以获得振动信号的突变信息，即可以获得机组振动的故障状况，从而?诊断机组振动的故障状况提供决策支援。
It ' s well known that the vibration fault diagnosis technology on steam turbine generator - set is a very complicated system project , which involves many fields and has a close relationship with practice . so it always draws much attentions from engineering field 众所周知，汽轮发电机组振动故障诊断技术是一项非常复杂的系统工程，涉及的相关学科领域较多，与现场实践经验联系十分密切，它一直是工程界十分关注和重视的课题。
It is stressed in this paper the analysis methods used in vibration faults of average power spectrum and cepstrum , based on the fast fourier transform algorithm , and development of the vibration signal analysis system in test - driving of wj6 engine , involved the technic of software or hardware 文章重点给出基于fft技术的功率谱和倒频谱分析方法、振动信号分析系统的设计和实现，讨论了相应软件开发中所涉及的技术问题。
Vibration of hydroelectric sets is main parameter that reflects the running status of the sets . it is vital to monitor vibration and diagnose the vibration fault of hydroelectric sets , and monitoring and fault diagnosing is important measure to ensure running safely and stably of hydroelectric sets 水电机组的振动是反映机组运行状态的重要参量，对机组振动进行监测和对振动故障进行诊断就显得非常重要，是保证机组安全稳定运行的重要措施。
This article is based on the actual situation of the large - scale hydropower plant . it describes the aim , meaning and content of device state monitoring and faults diagnose system and its application and development in and outside of the country , and also discuss the main fault type of large capacity unit , key technology and difficulty of this system . make the most use of present test method to study the cause of fault , conformation of test parameters , suitable arrangement of the test spots , choose of sensors , criterion of faults and diagnose expert system , and take the vibration fault of hydrogenerator units as an instance , set up the vibration faults diagnose model 本文从大型水电站的实际情况出发，对电站机电设备状态监测和故障诊断的目的、意义和内容以及国内外的应用、发展方向进行了描述，对大型水电站机电设备故障的类型以及设备状态监测和故障诊断的关键技术及在大型水电站实现状态监测和故障诊断的难点进行了探讨，并充分利用国内外现有的测试手段和技术，对大型水电站机组故障形成机理、测试参数的确定、测点的合理布置、传感器的选择、故障判断标准、以及诊断专家系统进行了研究，并以水轮发电机振动故障为例，建立了水轮发电机振动故障诊断模型。
According to the present situation and developing trends on condition monitoring and fault diagnosing of hydroelectric sets at home and abroad , and taking the technique of data fusion diagnosis hydroelectric sets as theme , this dissertation researches into data fusion fault diagnosis method based on dempster - shafer theory , and applies this technique to hydroelectric sets vibration fault diagnoses for the first time , and presents that using sub - band energy of vibration frequency to reflect the vibration intensity of hydroelectric sets 本文根据国内外关于水电机组状态监测与故障诊断研究的现状与发展趋势，以机组振动故障的信息融合诊断技术为研究主题，对基于dempster - shafer证据理论的信息融合故障诊断方法进行研究，首次将该方法应用到水电机组振动故障诊断中，并提出了用机组振动各频率的子带能量反映其振动强度的方法。
According to the steps of vibration fault diagnosis , many modules are designed in the program , which can fulfill some functions , such as the display of signal , the analysis of signal , etc . data is collected from a test on the rotor experimental platform , which is displayed and analyzed with the program mentioned in this paper 该程序按照振动故障诊断的步骤,设计了多个模块,能完成信号的显示、信号的分析等功能。在转子实验台上进行了实验,并且采集了数据,用本文中编制的程序进行了数据显示与分析。
The thesis devote to desams ( double - channel electro - hydraulic servo adaptive motor simulator - rig ) condition monitoring and accessing in theory and application . based on short signal analysis theory , the thesis explores the representative vibration faults of complex and non - linear equipment by both theoretical and experimental methods systematically 本文基于短信号分析技术，针对电液伺服道路模拟试验台运行状态监测和状态评价，对短信号的最大熵谱分析技术在自复杂非线性系统的实时在线故障诊断领域的应用进行了系统的理论和实验研究。
Based on the discussion of the base principle and several fusion diagnosis methods of multi - sensor data fusion , data fusion diagnosing method based on d - s theory is mainly researched ; according to the requirement of fusion principle , constitute methods of mass function are discussed , and the identify frame for fusion diagnose of hydroelectric sets vibration fault are constructed 在讨论了多传感器信息融合的基本原理和融合诊断的几种方法的基础上，重点研究了基于d - s证据理论的融合诊断方法，并根据融合规则的需求，讨论了基本可信度分配函数的构造方法，建立了水电机组振动故障的融合诊断识别框架。
