Calculation and Analysis of Torsional Vibration of Turbine Generator Shafts
The torsional vibration of turbine-generator shafts occurs due to the disturbance of electric power system. The coupling interaction between disturbance of electric power system and torsional vibration of shafts makes turbine-generator oscillate. Alternating torsional stress due to large torsional vibration decreases the life of shafts, even results in shafts broken. It is significant to calculate and analyze the natural properties and response of torsional vibration excited by the disturbance of electric power system in order to analyze and prevent catastrophic accident. A new method of response calculation of torsional vibration of turbine-generator shafts, the Increment Transfer Matrix method (ITM), which combines the Riccati transfer matrix method with the Newmark-β step-by-step integral method, is presented. By the ITM method, the transient response of torsional vibration of turbine-generator shafts, especially at the dangerous cross-sections, can be calculated. A system of calculation and analysis of torsional vibration of turbine-generator shafts is developed. With multi-mass lumped model, the model of torsional vibration of turbine-generator shafts is obtained. The system calculates the natural frequencies and the modal shapes of torsional vibration with the transfer matrix method, the response of torsional vibration of shafts with the increment transfer matrix method, such as torsional angle, angular velocity, angular acceleration, cross-section torque, torsional stress, and so on. The response spectrum of torsional vibration can be obtained by fast Fourier transform algorithm. It is proved that the system is good precision, convenient use, friendly interface, and visual calculation. The responses of torsional vibration of 200MW turbine-generator shafts due to the generator at non-all-phase operation are calculated and analyzed. The natural characteristics and responses of torsional vibration of shafts of 200MW turbine-generator are simulated and analyzed under the catastrophic accident condition. The cause of bolt broken of the coupling of intermediate-pressure rotor and low-pressure rotor and the coupling of generator rotor and exciter rotor are discussed. The results are identical with the data recorded in field.
Torsional Vibration Transfer Matriz Method Turbine Generator Shafts Electro-mechanical Coupling
He Qing Du Dongmei He Zirui
Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 1001
国际会议
The Fifth International Conference on VETOMAC-V(第五届振动工程及机械技术国际会议)
武汉
英文
180-185
2009-08-27（万方平台首次上网日期，不代表论文的发表时间）