Decomposition of harmonic wavelets of torsional vibrations as basis for evaluation of combustion in compression-ignition engines

• Autorzy: Dereszewski M. , Drewing S.

Identyfikatory

DOI

10.5604/01.3001.0012.4323

• Języki publikacji: EN

Abstrakty

EN

The aim of analysis presented in the article is results of measurements of torsional deflections of a crankshaft of three-cylinder internal combustion diesel engine. The wavelets of the run of torsional twists were processed by decomposition to harmonics using FFT. In order to exactly recognize all dynamic aspects of gas forces acting during working stroke, decomposition was done in two ways: first one relaying on records encompassing one working cycle (two revolutions), the second one based at separated periods encompassing angular an interval from TDC (Top Dead Centre) of one cylinder to TDC of subsequent in firing order. For three-cylinder engine, width of the interval is 240 degrees of crank angle. In order to obtain reliable results, torsional deflection signals acquisitions were recorded numerous times including changes of outer conditions (temperature, atmospheric pressure) and different values of the engine loads. The main goal of conducted experiments was looking for an answer of a question if exist any differences between frequency spectrums of harmonics of run of full cycle ( two revolutions) and the same cycle divided by three separate intervals. Analysis was conducted in order to state any possibility of diagnostic signals acquisition caused by abnormalities of combustion process. Results were presented in form of comparison of frequency spectra taken from full cycle and divided intervals.

Słowa kluczowe

EN

diagnostics; diesel engine; torsional vibrations; signal processing

• 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. 3
• Strony: 129--135
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Dereszewski M.

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

autor

Drewing S.

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

Bibliografia

• [1] Dereszewski, M., Charchalis, A., Analysis of diagnostic utility of instantaneous angular speed of a sea going vessel propulsion shaft, Journal of KONES, Vol. 18, No. 1, 2011.
• [2] Dereszewski, M., Wykorzystanie modelu dynamicznego silnika Sulzer 3Al25/30 do symulacji wpływu zmian obciążenia i uszkodzeń na fluktuację prędkości kątowej, Zeszyty Naukowe AM Gdynia, Nr 81, 2013.
• [3] Geveci, M., Osburn, A. W., Franchek, M. A., An investigation of crankshaft oscillations for cylinder health diagnostics, Mechanical System and Signal Processing, Vol. 19, pp. 1107-1134, 2005.
• [4] Ostman, F., Toivonen, H., Active torsional vibration control of reciprocating engines, Control Engineering Practice, Vol. 16 (1), pp. 78-88, 2008.
• [5] Rizzoni, G., Diagnosis of the individual cylinder misfire by signature analysis of the crankshaft speed fluctuation, SAE Technical Paper, No. 890884, pp. 1572-1580, 1989.
• [6] Rizzoni, G., Estimate of indicated torque from crankshaft speed fluctuations: a model for dynamics of IC engine, IEEEE Transaction, Vol. 38, pp. 168-179, 1990.
• [7] Taraza, D., Heinen, N. A., Bryzik, W., The frequency analysis of the crankshaft’s speed variation: a reliable tool for diesel engine diagnosis, Journal of Engineering for Gas Turbines and Power, Vol. 123 (2), pp. 428-432, 2001.

Uwagi

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