Research on Vibration Monitoring System of Turbine and Rotor Dynamics Analysis
|Course||Mechanical Design and Theory|
|Keywords||state monitoring synchronous sampling consecutively sampling transfer matrix method flexible rotor dynamic balance|
As a kind of clean regenerative energy, hydroelectricity has been more and more important in the electric power industry by right of its huge potential resources. Improving the stability and reliability of hydro-machinery, executing Condition Based Maintenance, developing condition monitoring technology has been inexorable trend in the electric power industry.A turbine unit vibration monitoring system is designed and developed. A rotor dynamics analysis software based on transfer matrix method is developed. A rotor dynamics test-bed is manufactured. Rotor dynamics test on this test-bed is completed.The turbine unit vibration monitoring system is mainly composed of hardware and software. It has the functions with the signal conditioning, data acquisition, real-time parameter display, data storage and data analysis,used for 32-channels signal monitoring and analysis. Data acquisition card of the monitoring system may realize 8-channels signal synchronous sampling using two AD7865 chips and consecutive sampling using alternative storage method. The card can capture the sudden transient signal completely and accurately and enhance monitoring reliability. Data analysis software of the monitoring system not only supplies the basic signal processing methods, such as time and spectrum analysis, orbit analysis and waterfall analysis, but also develops dynamic balance analysis module. This monitoring system can also be used in steam turbine or other rotating machinery monitoring and analysis.The rotor dynamics analysis program based on the transfer matrix method is provided reference for designing and adjustment rotor system. The program design is on the base of Matlab language.The rotor test-bed can realize speed adjustable continuously, turntable position variable and imbalance quality fitting arbitrarily on the turntable. Speed-up test and dynamic balance test of flexible rotor are accomplished on this test-bed. The amplitude-speed curve with the speed between 300-6000 r/min is measured. Using the monitoring system the first critical speed of the rotor system is tested out, consistent with the result calculated by the rotor dynamics analysis program based on the transfer matrix method. Under the guidance of the balancing analysis module of the monitoring system, the balancing test is achieved for initial imbalance flexible rotor. After the balancing weight, the rotor amplitude decreases 60%, 20% and 37.5% on the three balance speed 1200r/min, 2000r/min and 3000r/min.