Comparison of amplitude-based and phase-based method for speed tracking in application to wind turbines

• Autorzy: Urbanek J. , Barszcz T. , Sawalhi N. , Randall R. B.
• Języki publikacji: EN

Abstrakty

EN

Focus of the vibration expert community shifts more and more towards diagnosing machines subjected to varying rotational speeds and loads. Such machines require order analysis for proper fault detection and identification. In many cases phase markers (tachometers, encoders, etc) are used to help performing the resampling of the vibration signals to remove the speed fluctuations and smearing from the spectrum (order tracking). However, not all machines have the facility to install speed tracking sensors, due to design or cost reasons, and the signal itself has to then be used to extract this information. This paper is focused on the problem of speed tracking in wind turbines, which represent typical situations for speed and load variation. The basic design of a wind turbine is presented. Two main types of speed control i.e. stall and pitch control are presented. The authors have investigated two methods of speed tracking, using information from the signal (without relying on a speed signal). One method is based on extracting a reference signal to use as a tachometer, while the other is phase-based (phase demodulation).Both methods are presented and applied to the vibration data from real wind turbines. The results are compared with each other and with the actual speed data.

Słowa kluczowe

EN

speed tracking; speed estimation; instantaneous frequency; wind turbines

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2011
• Tom: Vol. 18, nr 2
• Strony: 295--303
• Opis fizyczny: Bibliogr. 10 poz., rys., tab., wykr.

Twórcy

autor

Urbanek J.

autor

Barszcz T.

autor

Sawalhi N.

autor

Randall R. B.

• AGH University of Science and Technology, 30-059 Kraków, Poland,

Bibliografia

• [1] Bartelmus, W., Zimroz, R. (2009). A new feature for monitoring the condition of gearboxes in nonstationary operating conditions. Mechanical Systems and Signal Processing, 23(5), 1528-1534.
• [2] Bently, D., Hatch, C. (2002). Fundamentals of Rotating Machinery Diagnostics. Bently Pressurized Bearings Press.
• [3] Barszcz, T. (2004). Proposal of new method of mechanical vibration measurement. Metrology and Measurement Systems, 11(4), 409 - 421.
• [4] Bonnardot, F., El Badaoui, M., Randall, R.B., Danie`re, J., Guillet, F. (2005). Use of the acceleration signal of a gearbox in order to perform angular resampling (with limited speed fluctuation). Mechanical Systems and Signal Processing, 19, 766–785.
• [5] Borkowski, D. (2005). On-line instantaneous frequency estimation and voltage/current coherent resampling metod. Metrology and Measurement Systems, 12(1), 59 - 75.
• [6] Sedlacek, M., Krumpholc, M. (2005). Digital measurement of phase difference - a comparative study of DSP algorithms. Metrology and Measurement Systems, 12(4), 427 - 449.
• [7] Combet, F., Gelman, L. (2007). An automated methodology for performing time synchronous averaging of a gearbox signal without speed sensor. Mechanical Systems and Signal Processing, 21, 2590-2606.
• [8] Combet, F., Zimroz, R., (2009). A new method for the estimation of the instantaneous speed relative fluctuation in a vibration signal based on the short time scale transform. Mechanical Systems and Signal Processing, 23, 1382 - 139.
• [9] Coats, M.D., Sawalhi, N., Randall, R.B. (23-25 Nov 2009). Extraction of tach information from a vibration signal for improved synchronous averaging. Proceedings of Acoustics. Adelaide. Australia.
• [10] Proceedings of the IEEE. (1996). Special Issue on Time Frequency Analysis, 84(9), 1194-1345.