The diagnostic model proposition of the engine vibration signal

• Autorzy: Komorska I.
• Języki publikacji: EN

Abstrakty

EN

Vibroacoustic signal of reciprocating engine carries diagnostic information that is not efficiently used because of complicated signal processing methods for separation of useful components and noise elimination. The measured vibrations are a mixture of periodic waves due to the rotating components and transient waves due to the reciprocating components of the engine and pressure forces. Engine vibrations may be described in several ways depend on the diagnostic purpose. For detecting non-uniform cylinder operation, for instance, the methods for rotating machines can be considered. Many transients occur in vibration signal of the combustion engine like exhaust and inlet valve operations, fuel injection, combustion, piston slap. To analyze them the time-frequency methods can be used. Diagnosing of some damages, like valve clearance changing or valve burning, can be done using the diagnostic model. This model should be rather simple and sensitive to mentioned damages. In modelling two approaches can be considered. The first one is based on the real physical parameters of the system. The second one is making the abstractive statistical model of signal with abstractive parameters. In the paper the autoregressive model is proposed. Identifying model is finding periodically time-varying coefficients of the equivalent filter. All the damages in the system make changes of the coefficients. The model presented in the paper is illustrated with the signal of spark ignition combustion engine.

Słowa kluczowe

EN

vibroacoustic model; autoregressive model; combustion engine; valve vibration

• 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: 2008
• Tom: Vol. 15, No. 2
• Strony: 191--197
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Komorska I.

• Radom University of Technology Institute of Vehicles and Machines Maintenance Chrobrego Street 2426-600 Radom, Poland tel.[phone], fax: [phone],

Bibliografia

• [1] Antoni, J., Badaoui, M. El, Guillet, F., Daniere, J.: Some New Diagnostic Parameters for Reciprocating Engines, SAE Paper 1999-01-1714.
• [2] Cholewa, W., Kaźmierczak, J.: Data Processing and Reasoning in Technical Diagnostics, WNT, Warszawa 1995.
• [3] Dąbrowski, Z., Madej, H.: Maskowanie uszkodzeń mechanicznych przez nowoczesne systemy sterowania silników spalinowych, Journal of KONES 2006.
• [4] Komorska, I.: Poszukiwania modelu wibroakustycznego silnika spalinowego, Przegląd Mechaniczny 11’07, pp. 11-13, 2007.
• [5] Komorska, I: Próba lokalizacji faz rozrządu w silniku spalinowym o zapłonie iskrowym na podstawie sygnału wibroakustycznego. Proc. of XXIII Sympozjonu Podstaw Konstrukcji Maszyn, Rzeszów - Przemyśl 2007, Vol. I, pp. 285-290.
• [6] Komorska, I.: Modelling of Vibration Signal for Reciprocating Engine Diagnostics, Proc. of IV Int. Congress of Technical Diagnostics, Olsztyn 2008.
• [7] Suh In-Soo: Application of Time-Frequency Representation Techniques to the Impact-Induced Noise and Vibration from Engines, SAE Paper 2002-01-0453.