Instantaneous angular speed: encoder-counter estimation compared with vibration data

• Autorzy: Spagnol M. , Bregant L.
• Języki publikacji: EN

Abstrakty

EN

In rotating machinery, actions of the moving parts take place at specific angular positions rather than at specific times. For this reason, having a geometrical reference, such as the one provided by an encoder, and studying the Instantaneous Angular Speed (IAS) variations can provide a large amount of information about the health status of the machine. In fact, from the variation of the IAS during the machine loads’ cycle it is possible to identify defects and faults. The current work focuses on the estimation of the IAS through the Elapsed Time (ET) method, using a counter in order to measure the time elapsed between the pulses of an encoder. Both IAS and vibration measurement are conducted on an asynchronous four poles electrical motor driven by 50Hz line current, without load. The study compares the order analysis of both signals. The bearing’s Fundamental Train Frequency is detected using IAS estimation.

Słowa kluczowe

EN

instantaneous angular speed; encoder; elapsed time method; AC DC electrical machine; slip effect

• Wydawca: Polskie Towarzystwo Diagnostyki Technicznej
• Czasopismo: Diagnostyka
• Rocznik: 2013
• Tom: Vol. 14, No. 3
• Strony: 9--13
• Opis fizyczny: Bibliogr. 7 poz., rys., tab., wykr.

Twórcy

autor

Spagnol M.

• Università degli Studi di Trieste, via A. Valerio 10, 34127 Trieste TS Italy

autor

Bregant L.

• Università degli Studi di Trieste, via A. Valerio 10, 34127 Trieste TS Italy

Bibliografia

• [1] André, H. Bourdon, A. Antoni, J. Remond, D. (2012). Precision of the IAS monitoring system based on the elapsed time method in the spectral domain. Proceedings of the International Conference on Noise and Vibration Engineering ISMA 2012, Belgium, pp. 1126-1142.
• [2] Li, Y. Gu, F. Harris, G. Ball, A.D. Bennett, N. Travis, K. (2005). The measurement of instantaneous angular speed. Mechanical Systems and Signal Processing, Vol. 19, no. 4, pp. 786-805.
• [3] National Instruments (2013). Frequency Measurements: How-To Guide. Tutorial 7111.
• [4] Renaudin, L. Bonnardot, F. Musy, O. Doray, JB. Remond, D. (2010) Natural roller bearing fault detection by angular measurement of true instantaneous angular speed, Mechanical Systems and Signal Processing, Vol. 24, no. 7, pp. 1998-2011.
• [5] Resor, BR. Trethewey, MMW. Maynard, KPK. (2005). Compensation for encoder geometry and shaft speed variation in time interval torsional vibration measurement. Journal of Sound and Vibration, Vol. 286, no. 4-5, pp. 897-920.
• [6] Spagnol, M. Bregant, L. Boscarol, A. (2013) Instantaneous Angular Speed: comparisons between Torsional Laser Vibrometer and Encoder-Counter estimations. Proceedings of COMADEM2013.
• [7] Youssef, W. Guillet, F. Elbadaoui, M. (2011) Characterization of counter technique for instantaneous angular speed measurement: Application on gear box signal. Proc. of the ICS6, Université Technologique de Compiègne, France.