TY - GEN
T1 - Study on the vibration characteristic of turbine rotor eccentricity based on FFT
AU - Mao, Yujun
AU - Fang, Shuzhou
AU - Li, Teng
AU - Ma, Hongpeng
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2016/8/23
Y1 - 2016/8/23
N2 - Due to the manufacturing error, the worm deflection and other problems caused by the turbine rotor eccentricity, in the impeller vortex will cause the internal flow field of time pulsation, which leads to the additional flow excitation and noise. In this paper, the simulation of the centripetal turbine in eccentric rate stable condition, effect of rotor eccentricity on the exciting force, and the fast Fourier transform (FFT) and the results are analysed by fluent simulation program. Numerical simulation results show that in steady condition, the centripetal turbine rotor eccentricity will lead to cyclical changes in the exciting force effect on turbine blades, on the X axis and the Y axis direction, the blade is subject to the cycle and amplitude of the force are basically the same with a period of about 12T2, The force curve is similar to the sine signal, but the signal at the peak of the cycle is more complex, and the fluctuation is obvious, Cycle of about 12T2. The amplitude is about 10.342. At the peak, the stress change is complicated, and there is obvious fluctuation. The FFT spectrum is shown as four independent frequencies, which are located in 1X, 2X, 3X, 4X, and, where the 3X component has a more pronounced fractional resonance.
AB - Due to the manufacturing error, the worm deflection and other problems caused by the turbine rotor eccentricity, in the impeller vortex will cause the internal flow field of time pulsation, which leads to the additional flow excitation and noise. In this paper, the simulation of the centripetal turbine in eccentric rate stable condition, effect of rotor eccentricity on the exciting force, and the fast Fourier transform (FFT) and the results are analysed by fluent simulation program. Numerical simulation results show that in steady condition, the centripetal turbine rotor eccentricity will lead to cyclical changes in the exciting force effect on turbine blades, on the X axis and the Y axis direction, the blade is subject to the cycle and amplitude of the force are basically the same with a period of about 12T2, The force curve is similar to the sine signal, but the signal at the peak of the cycle is more complex, and the fluctuation is obvious, Cycle of about 12T2. The amplitude is about 10.342. At the peak, the stress change is complicated, and there is obvious fluctuation. The FFT spectrum is shown as four independent frequencies, which are located in 1X, 2X, 3X, 4X, and, where the 3X component has a more pronounced fractional resonance.
KW - CFD
KW - crack
KW - fault diagnosis
KW - time-frequency analysis
KW - turbine rotor
UR - https://www.scopus.com/pages/publications/84987967976
U2 - 10.1109/ICMAE.2016.7549542
DO - 10.1109/ICMAE.2016.7549542
M3 - Conference contribution
AN - SCOPUS:84987967976
T3 - Proceedings of 2016 7th International Conference on Mechanical and Aerospace Engineering, ICMAE 2016
SP - 239
EP - 243
BT - Proceedings of 2016 7th International Conference on Mechanical and Aerospace Engineering, ICMAE 2016
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 7th International Conference on Mechanical and Aerospace Engineering, ICMAE 2016
Y2 - 18 July 2016 through 20 July 2016
ER -