The identification and elimination of interference in pressure course in the cylinders of internal combustion engines measured under marine power plant exploitation conditions

Monieta, J.

doi:10.5604/0860889x.1172072

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“…The literature shows that one of the disturbed signals are the pressure courses in the cylinders of the piston internal combustion engines [5,9,12]. From the inside of the cylinder, the pressure rises violently after the combustion process begins, forming a standing resonant wave after reaching the pressure sensor, which significantly affects the quality and accuracy of the recorded pressure by introducing undesirable interference [2,5].…”

Section: Types and Sources Of Interferencementioning

confidence: 99%

“…The conditions in the actual marine power plant from the conditions in the laboratory [8,9]:  significant level of vibration and noise caused by the operation of other objects of the marine propulsion plant,  changes in the voltage and frequency of the ship's network affecting the measuring instruments,  change torque of internal combustion engines as the result of continuous changes of the value of the demanded power,  changes of the value of the reference parameters.…”

Section: Research Problemmentioning

confidence: 99%

“…The in-pressure courses have most often been received of internal combustion engines about slight interferences [8], but there were happened the signals significantly disturbed [9]. These were disturbances that persisted in established states.…”

Section: Technical Data Of the Investigated Object And Measurement Eqmentioning

confidence: 99%

“…Interference causes malfunction of an object or system and may cause gradual and sudden damage. The disturbances also adversely affect the diagnostics of supervised objects [7,9,14,15].…”

Section: Introductionmentioning

confidence: 99%

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Experimental manners of a interference reduction of chosen measuring signals of a generating set in conditions of a marine power plants

Monieta¹,

Nowicki²

2018

Diagnostyka

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Article citation info: Monieta J, Nowicki M. Experimental manners of a interference reduction of chosen measuring signals of a generating set in conditions of a marine propulsion plants. Diagnostyka. 2018;19(1):93-102. http://dx. AbstractThe article presents problems occurring during the signals processing of the parameters of working processes of internal combustion engines in tests, while powering the measuring apparatus from the electric network of the marine power plant laboratory. Various experimental methods of separation were used to identify and then eliminate interference. On the basis of analyses carried out in the domain of time and frequency of the in-cylinders pressure signals of internal combustion engines and their wavelet decomposition, attempts were made to determine and eliminate the sources of interference. It has been shown that interference was penetrating the measuring equipment through the supply network. The developed methods of reducing interference in the laboratory conditions can be applied on the marine vessels. On the basis of the conducted tests, it can be concluded that the reduction of interference of pressure measurement signals in the engine cylinder is most effective when the computer is powered only from the battery while the measuring circuit is powered directly from the power network.Keywords: marine power plants, generating sets, in-cylinder pressure courses, interference EKSPERYMENTALNE SPOSOBY REDUKCJI ZAKŁÓCEŃ WYBRANYCH SYGNAŁÓW POMIAROWYCH ZESPOŁU PRĄDOTWÓRCZEGO W WARUNKACH LABORATORIUM SIŁOWNI OKRĘTOWYCH Streszczenie W artykule przedstawiono problemy występujące w czasie przetwarzania sygnałów parametrów procesów roboczych w badaniach silników spalinowych, przy zasilaniu aparatury pomiarowej z sieci elektrycznej laboratorium siłowni okrętowej. Dla identyfikacji i następnie eliminacji zakłóceń zastosowano różne eksperymentalne metody ich separacji. Na podstawie wykonanych analiz w dziedzinie czasu i częstotliwości sygnałów ciśnienia w cylindrach silników spalinowych oraz ich dekompozycji falkowych próbowano ustalić źródła zakłóceń oraz je eliminować. Wykazano, że zakłócenia przedostają się do aparatury pomiarowej przez sieć zasilającą. Wypracowane sposoby redukcji zakłóceń w warunkach laboratoryjnych mogą być zastosowane na statkach morskich. Na podstawie przeprowadzonych badań można stwierdzić, że redukcja zakłóceń sygnałów pomiarowych ciśnienia w cylindrze silnika jest najskuteczniejsza, gdy komputer zasilany jest tylko z baterii, a tor pomiarowy bezpośrednio z sieci elektroenergetycznej.Słowa kluczowe: siłownie okrętowe, zespoły prądotwórcze, przebiegu ciśnienia cylindrowego, zakłócenia

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Section: Types and Sources Of Interferencementioning

confidence: 99%

Section: Research Problemmentioning

confidence: 99%

Section: Technical Data Of the Investigated Object And Measurement Eqmentioning

confidence: 99%

“…Interference causes malfunction of an object or system and may cause gradual and sudden damage. The disturbances also adversely affect the diagnostics of supervised objects [7,9,14,15].…”

Section: Introductionmentioning

confidence: 99%

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