Abstract
The rotor critical speed of turbine generator unit when the amplitude of the rotor increases sharply, bring to unit certain harm, rotor critical speed calculation method often results with the actual error is bigger. Through Bode diagram method and frequency spectrum analysis method, the rotor critical speed measurement was carried out. Through the experimental results it was concluded that two methods the test results are basically identical, and bode diagram was determined the selection method of measuring rotor critical speed more accurate. By changing the rotor on the quality of the wheel and position change, the use of Bode diagram method for rotor critical speed measurement. It was concluded that with the increase of the quality of the rotor critical speed decreased, the impact is not big in the center of the deviation from the rotor position far; The same quality case, the farther wheel deviating from the center of rotor, the rotor critical speed increases faster. The test results can guide the engineering practice, for the calculation of the rotor critical speed, the simulation and experiment have certain reference function.
Highlights
Nowadays, the thermal power plant has a great development prospect towards the trend of large-capacity and high-parameter units, so the steady operation of the unit and centralized control call for great care
According to the three critical speed measurement method, the critical speed, the three-rotor critical speed measurement method of maximum amplitude, speed error, maximum amplitude error, speed error rate and amplitude error rate are listed in Table 1, drawing the following conclusion
The error of the rotation speed and the maximum amplitude is less than 2.5 %, which proves that the results of the two methods are accurate, (2) By Bode diagram method, the critical speed and the phase change of rotor are clear and explicit in the experiment and the experimental results are accurate
Summary
The thermal power plant has a great development prospect towards the trend of large-capacity and high-parameter units, so the steady operation of the unit and centralized control call for great care. Due to the unclear material, the over-simplified model, inaccurate selection of boundary conditions and error analysis, the imprecise calculation of critical speed ensue, which causes large deviation of reference critical speed and excessive rubbing damage during start-up and shut-down phrase. Papers [6, 7] and [8] are introduced to analyze the damage of the critical speed to the unit, the preventive measures and THE EXPERIMENTAL STUDY ON INFLUENCE OF TURBINE WHEEL POSITION AND MASS ON ROTOR CRITICAL SPEED. Deng Wangqun [11] conducted a simulation using rotor dynamics analysis software SAMCEF/ROTOR to calculate and analyze the first three-order critical speed of a low-pressure rotor under different bearing stiffness coefficients and wheel qualities. By changing the rotor wheel position and quality, we can get their relationships between rotor critical speed
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