METHOD FOR MONITORING SHAFT TORSIONAL VIBRATION AND FATIGUE OF TURBINE GENERATOR

摘要

PURPOSE:To monitor exactly shaft torsional vibration and fatigue of a turbine generator, by adjusting a parameter of a mathematical model of a modal analyzing method by calculated modal damping, and deciding torsional vibration and stress of a shaft system. CONSTITUTION:By a damping operation part 8a of a signal processing part 8, torsional natural vibration of a shaft 4, modal damping, etc. are deciced from shaft torsional angle displacement from torsional angle detecting parts 5a, 5b. In accordance with decision of them, in a torsional vibration and stress calculating part 8b, a mathematical parameter by set modal analysis by electric torque and vapor pressure from detecting parts 6, 7 is adjusted, and a torsional vibration and stress state of each part of the shaft 4 is calculated. Subsequently, by a compare-operating part 8c, a calculation result of the calculating part 8b is compared with shaft torsional angle displacement, and in case when its error is large, the mathematical model parameter is readjusted, and it is repeated until the error becomes small. In this way, in accordance with a correct calculation result of the claculating part 8b, shaft torsional vibration and fatigue of a turbine generator is monitored exactly through a fatigue and life operating part 9.