Impact of sea waving at fluctuation of instantaneous angular speed of ship’s propulsion shaft

• Autorzy: Dereszewski M.

Identyfikatory

DOI

10.5604/12314005.1134055

• Języki publikacji: EN

Abstrakty

EN

The paper presents results of analysis how sea waves affect variation of angular speed of a propulsion shaft of the ship during sea passage. That information is necessary to evaluate the level of credibility of measurements taken as reference value for detection of main engine combustion failures and evaluation of cylinders’ contribution to total power based on shaft’s angular speed irregularity observations. Utilization of IAS (Instantaneous Angular Speed) for diagnostic purposes is mostly based on comparison of actual state measurement with characteristics taken during healthy engine run in certain outer conditions. All variations of atmospheric pressure and air temperature have noticeable impact at instantaneous value of angular speed, they and must be considered during comparison procedure. For marine propulsion set, two weather deriving factors, having impact at angular speed of the shaft, can occur. First one is mentioned above values of air temperature and air pressure, the second one is torque variations caused by changes of propeller’s draught due to pitch of the hull. Any deviations from sampling course of angular speed are treated as malfunction symptoms. The aim of analysis was to evaluate how pitching frequency affect run of IAS and how whether omitting of that impact can lead to wrong conclusions.

Słowa kluczowe

EN

diagnostics; low speed diesel engine; shaft's angular speed; wave influence

• 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: 2014
• Tom: Vol. 21, No. 1
• Strony: 59--65
• Opis fizyczny: Bibliogr. 5 poz., rys.

Twórcy

autor

Dereszewski M.

• Gdynia Maritime University, Faculty of Marine Engineering Morska Street 83, 81-225 Gdynia, Poland tel.: [phone], fax: [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, No. 81, Gdynia 2013.
• [3] Lipis, W., Gidrodinamika griebnogo winta pri kaczkie sudna, Wydawnictwo Sudostrojenie, 1975.
• [4] Polanowski, S., Studium metod analizy wykresow indykatorowych w aspekcie diagnostyki silników okrętowych, Zeszyty Naukowe AMW, Nr 169 A, Gdynia 2007.
• [5] Dudziak, J., Teoria Okrętu, Fundacja Promocji POiGM, Gdańsk 2008.