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Vibration analysis on the mechanism s for hydropower unit rotors based on e mpirical m ode d ecomposition

XIANGQIAN FU1,* , HAO XU2, YATAO LIN2, ZHIHUI XIAO1

Affiliation

  1. School of Power and Mechanical Engineering, Wuhan University
  2. School of Power and Mechanical Engineering, Wuhan University , China

Abstract

According to the coupling faults o f mass eccentricity and misalignment, this paper presents a novel vibration analysis method, which employs the nonlinear rotor dynamics with the vibration signal processing scheme based on the Empirical Mode Decomposition (EMD), to understand the vibration mechanism. Such a novel method can decompose the tested signals and compare the simulation results of frequency and normalized energy of intrinsic mode functions (IMF). It is revealed that if t he frequency of characteristic IMF is concentrated in the rota ting frequency, and the maximum value of IMF is less than 1mm, the rotor is in the state of stable periodic motion; Otherwise, the rotor is in the state of periodic rubbing motion, if freq uency of characteristic IMF is concentrated in the rotating frequenc y and quarter to one third rotating frequency nearby, the rotor running is in a chaotic motion. The novel method not only provides a new method for vibration signal analysis, but also lays the foundation for fault diagnosis of vibration signals..

Keywords

Hydropower unit, Rotor dynamics, EMD, Fa ult diagnosis, Mode recognition.

Submitted at: Aug. 14, 2013
Accepted at: May 15, 2014

Citation

XIANGQIAN FU, HAO XU, YATAO LIN, ZHIHUI XIAO, Vibration analysis on the mechanism s for hydropower unit rotors based on e mpirical m ode d ecomposition, Journal of Optoelectronics and Advanced Materials Vol. 16, Iss. 5-6, pp. 689-696 (2014)