Dynamic Systems Group, Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria, 0002, South Africa
Oberholster, A.J., Dynamic Systems Group, Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria, 0002, South Africa; Heyns, P.S., Dynamic Systems Group, Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria, 0002, South Africa
The ability to monitor the vibration of blades online is of great importance to the structural health of turbomachinery. This paper focuses on the fixed reference frame or Eulerian implementation of laser Doppler vibrometry to perform this function. The way in which this measurement technique works is studied analytically and then a numerical simulation approach is proposed. Through experimental testing and finite element modeling, it is shown that this measurement approach is in principle viable for online blade condition monitoring when phase angles at reference frequencies are monitored, using non-harmonic Fourier analysis. © 2009 Elsevier Ltd. All rights reserved.
Classifiers; Doppler effect; Fourier analysis; Fourier transforms; Harmonic analysis; Laser Doppler velocimeters; Lasers; Mines; Turbomachinery; Vibration measurement; Eulerian laser Doppler vibrometry; Non-harmonic Fourier analysis; Online blade condition monitoring; Phase angle trends; Tracking laser Doppler vibrometry; Condition monitoring
