水轮发电机低频振动的测量研究  

Research on the measurement of low-frequency vibration of water turbine generators

作　　者：肖明伟[1] 杨永明[1] 钟玉林 付志红[1] 张淮清[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044 [2]重庆地质仪器厂,重庆400030

出　　处：《传感器与微系统》2011年第5期54-57,共4页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(40874094);重庆大学"211工程"三期创新人才培养计划建设项目(S-09111)

摘　　要：水电机组振动参数是监测其运行稳定性的主要指标,且振动频率较低。为测量大中型水电机组低频振动,根据振动传感器频率特性补偿原理,设计了低频补偿电路,使其频率特性向低频拓展。为滤波电路的设计方便,引进了等效品质因数Q。阐述了磁电式振动传感器的数学模型,补偿电路的设计,将传感器系统与其数学模型的幅频特性在校正前、后分别进行对比分析。实验结果表明:补偿后该系统幅频特性能够向低频拓展,且稳定度、线性度等性能较好。The hydropower generating units＇ vibration parameter is an important index to monitor its operating stability.To measure the low-frequency vibration of the large and middle scale of hydropower generating units,according to frequency characteristic compensation principle of the vibration sensor,a low-frequency compensating circuit is designed to extend the frequency characteristics to the low frequency region.To make the design of compensating circuit convenient,the equivalent quality factor Q is brought in.The mathematical model of the magnetoelectric vibration sensor and the design of the compensation circuit are described in detail.The amplitude-frequency characteristics of the sensor and its mathematical model are comparatively analyzed before and after compensation respectively.The experimental result shows that the design could extend the amplitude-frequency characteristics to the low frequency region,and have good stability and linearity.

关 键 词：传感器 振动 幅频特性 补偿电路 传递函数 灵敏度 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]