Processing of long lasting signals of torsional vibrations measured using incremental encoders

• Autorzy: Dereszewski M. , Sikora G.

Identyfikatory

DOI

10.5604/01.3001.0012.4776

• Języki publikacji: EN

Abstrakty

EN

The article describes processing method of a signal, coming from torsional deflections of an internal combustion piston engine’s crankshaft, registered using two optical encoders ETNP-10. Standard measurement and recording set ETNP-10 enables recording of Instantaneous Angular Speed values encompassing 10 revolutions of the crankshaft, what is equal to 5 cycles of four-stroke engine. That time duration is sufficient for analysis of changes of angular speed caused by, for example, malfunction of fuel injection valve, but is insufficient in case of observation characterized by low frequency changes with period of fluctuations, lower than 0.8 sec. Short time for recording makes impossible following of instantaneous angular speed deviations caused by magnitude modulation of engine’s load value. In the article is presented an algorithm written in MATLAB environment, which allows processing of the data recorded using the recorder DAS 1600 Sefram. The recorded this way signals have around 26 seconds' duration of engine work. Data acquired from two encoders mounted at opposite sides of the shaft, in form of square magnitude signals are transformed into instantaneous speed and subsequently to instantaneous angular shift, what is basis for torsions calculation. In the article is also presented method of elimination of systematic error due to assumed method of averaging. Finally, some examples of results of torsional deflection measurement and analysis are presented.

Słowa kluczowe

EN

diagnostics; diesel engine; torsional vibrations; torque; angular speed

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2018
• Tom: Vol. 25, No. 4
• Strony: 59--65
• Opis fizyczny: Bibliogr. 6 poz., rys.

Twórcy

autor

Dereszewski M.

• Gdynia Maritime University Mechanical Faculty Morska Street 83, 81-225 Gdynia, Poland tel.: [phone]

autor

Sikora G.

• Gdynia Maritime University Mechanical Faculty Morska Street 83, 81-225 Gdynia, Poland tel.: [phone]

Bibliografia

• [1] Desbazeille, M., Randall, R. B., Guillet, F., El Badaoui, M., Hoisnard, C., Model-based diagnosis of large diesel engines based on angular speed variations of the crankshaft, Mechanical Systems and Signal Processing, Vol. 24, pp. 1108-1134, 2010.
• [2] Dereszewski, M., Charchalis, A., Polanowski, S., Analysis of diagnostic utility of instantaneous angular speed of a sea going vessel propulsion shaft, Journal of KONES, Vol. 18. No. 1, pp. 77-83, 2011.
• [3] Geveci, M., Osburn, A. W., Franchek, M. A., An investigation of crankshaft oscillations for cylinder health diagnostics, Mechanical Systems and Signal Processing, Vol. 19. pp. 1108-1134, 2005.
• [4] Lin, T. R., Tan Andy, C. C., Ma, L., Mathew, J., Estimating the loading condition of a diesel engine using instantaneous angular speed analysis, Proceedings of the 6th World Congress on Engineering Asset Management, http://eprints.qut.edu.au./46609/, 2011.
• [5] Yang, J., Pu, L., Wang, Z., Zhon, Y., Yan, X., Fault detection in a diesel engine by analyzing the instantaneous angular speed, Mechanical Systems and Signal Processing, Vol. 15 (3), pp. 549-564, 2001.
• [6] Xiang, L., Yang, S., Gan, C., Torsional vibration measurements on rotating shaft system using laser Doppler vibrometer, Optics and Laser in Engineering, Vol. 50, pp. 1596-1601, 2012.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).