调速器液压随动系统故障诊断系统  

Fault diagnose system of governor hydraulic servo system

作　　者：范明树[1] 郭江[1] 张珂斐 袁方[1] 曾洪涛[1] 

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072

出　　处：《排灌机械工程学报》2014年第6期505-510,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51077102)

摘　　要：水力机组的运行特性和经济性能指标很大程度上受水轮机调速器液压随动系统影响.针对目前调速系统仅能实现基本在线监测和故障诊断功能的实际情况,在分析调速器液压随动系统的物理结构、工作原理和故障机理的基础上,利用改进的故障模式、影响和危害度分析(FMECA)方法进行故障定性分析,明确设备的功能、故障模式、故障原因和故障影响,建立调速器液压随动系统的分布式物理图网模型,与仿真模型提取定量特征指标值相结合进而实现设备的故障诊断.以开机过程中液压阀卡涩故障为例进行仿真分析,根据机组的频率、导叶开度、电液转换器、PID等关键监测位置信号输出结果的不同,判断调速器发生故障的类别.案例分析结果表明,该方法简单、可靠,能准确定位系统的故障,为实现机组的高效经济运行和日常维护提供决策基础.The normal operation of the governor hydraulic servo system has great influences on the operating characteristics and economic performance indicators of the whole hydro unit.In the practical situations that only basic online-monitoring and fault diagnose are achieved in present governing system,based on the analysis of the physical structure,the operating principle and fault mechanism of the hydraulic servo was studied using the improved fault mode effects and critical analysis（FMECA）which is used for the clarity of the function,fault mode,fault reason and fault effect of the equipment to qualitative analysis,and the distributed physical grid model of the hydraulic servo was established.According to the characteristic indexes obtained by the simulation model,a fault diagnose method was proposed.Simulation analysis taken from the jam faults of hydrovalve in the starting up procedure was given,and based on the different output of the frequency,guide vane opening,electro-hydraulic converter and PDD,the corresponding fault was estimated.From the case analysis,this method is proved to be simple,reliable and accurate,and the fault in the system can be allocated which provides the decision basis for the operating of high efficiency and daily maintenance.

关 键 词：液压随动系统 水轮机调速器 分布式物理图网建模 故障诊断 FMECA 

分 类 号：TK730.8[交通运输工程—轮机工程]