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2 Journal of Polish CIMAC

2 2012

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Low speed marine diesel engine diagnosis based on passive experiment

Polanowski S., Pawletko R.

Journal of Polish CIMAC

2012

Vol. 7, no 2

161-166

Analysis of the indicator diagram is the basis of technical state evaluation of marine diesel engines. The indicator diagram contains a large amount of diagnostic information. In most cases, analysis of the graph is reduced to determination only the maximum pressure or mean indicated pressure. It seems appropriate to determine the possibility of use heat release characteristics for the diagnostic purpose. The paper presents results of studies related to the use of indicator diagrams for the diagnosis of high power marine diesel engine. The results include a comprehensive approach to problems of use of the cylinder pressure curves for the evaluation of the technical condition of the engine. The problem of dynamic adjustment of the GMP position, smoothing distortions due to the impact of the channel and indicator valve were considered. Diagnostic analysis includes also the designation of the heat release characteristics on the basis of the curves pressure in the engine cylinder. The algorithms allow to determine both the curves of heat release rate q and the heat released Q. The curve of heat release rate q is a full equivalent to fuel injection pressure curve in the fuel pipes. It allows identification of the failure of the injection system. The curve of Q allows such determination and additional assessment of internal efficiency of the cylinder. The analyzed indicator diagrams were obtained during the sea voyage with the use of the stationary electronic indicator PREMET. The pressure sensor were placed on the indicator valves.

Influence of gas channels of medium speed marine engines on the accuracy of determination of diagnostic parameters based on the indicator diagrams

Pawletko R., Polanowski S.

Journal of Polish CIMAC

2012

Vol. 7, no 2

139-146

Analysis of the indicator diagram is the basis of technical state evaluation of marine diesel engines. The indicator diagram contains a large amount of diagnostic information. A major problem for the diagnostic use of the indicator diagrams in case of medium speed engines are distortion caused by the gas channels between the cylinder and the pressure sensor. Indicator channel and valve may introduce significant distortions which increases with increasing engine speed. The paper presents results of results of the analysis of the indicator diagram of engines in onboard service, and research conducted on the medium speed laboratory engine Al 25/30. These engines are characterized by gas channels of high complexity. During laboratory research pressure measurement (indication) was made by the sensor placed directly in the cylinder (instead of starting air valve), before the indicator valve (with special Kistler adapter) and on the indicator valve. Distortion of heat release characteristics for the sensor placed on the indicator valve is important, but it is estimated that diagnostic information is not erased. For medium speed engines is to be expected the use of a portable pressure sensors placed on the indicator valve. For this reason, further research is needed to assess the impact of channels and valves on different cylinders. During the research the course of heat release rate q and the heat released Q were determined. The curve of heat release rate q is a full equivalent to fuel injection pressure curve in the fuel pipes. It allows identification of the failure of the injection system. The curve of Q allows such determination and assessment of internal efficiency of the cylinder.