Abstract
The article presents selected elements of the elaborated diagnostic testing method of marine diesel engine working spaces based on the energetic and spectral-correlation analysis of the course of the pulsating exhaust flow process in the channel powering a turbocharger. The investigations have been worked out within the scope of a realization of the research project No. 0T00B02129 funded by the Committee of Scientific Research. Conducting of an analysis of the diagnostic informativeness among the parameters characterizing the observed gas dynamic processes represented an essential methodological question of the project. A mathematical model, enabling simulations of well-known and recognizable engine working spaces failures as well as an entropy functions, as the measure of uncertainty of the set of identified states of the engine unfitness were applied for such a diagnostic purpose. Having evaluated the diagnostic information three diagnostic parameters were selected in the result of experiments of the numerical simulation. Thus, the adequate parameters of a technical state assessment of the marine diesel engine working spaces were chosen while there was no possibility to work out the cylinder indication (to create cylinder indicator diagrams). The conducted simulating investigations represented an introduction to the experimental investigations (to the diagnostic tests) of DETROIT DIESEL and ZVIEZDA engines that had been put into operation on the Polish Navy warships in recent years.
Highlights
Every marine engine manufacturer defines a set of basic diagnostic parameters possible to be determined by the engine user during its operation at sea
Procentowe wartości metryk wyznaczono metodą porównania wzorcowych state of its full operativeness used in the analysis have been przebiegów czasowych parametrów termogazodynamiczacquired in the result of mathematical modelling of the gas nych, zarejestrowanych w wyniku symulacji pracy silnika dynamic processes worked out in the marine diesel engine w stanie pełnej zdatności eksploatacyjnej, z odpowiednimi working spaces
The lacking quantity of diagnostic information about the engine's working spaces technical state might be obtained from the harmonic analysis of courses of pulsation pressure in the exhaust channel gathered as the result of experimental investigations of the real objects as well as the systematic observations of the thermal-flow processes carried out on a large number of examined engines of the same type, without any interferences into their technical condition
Summary
Every marine engine manufacturer defines a set of basic diagnostic parameters possible to be determined by the engine user during its operation at sea. They establish the tolerance limits within which values of the parameters should be kept during the operation process. W których mogą znajdować się ich wartości podczas eksploatacji. Wyjście wartości któregokolwiek z wyznaczonych parametrów poza ustalone granice sygnalizuje niedopuszczalne zakłócenie procesów energetycznych realizowanych w silniku, grożące jego awarią. Analysing much greater number of diagnostic parameters is required, whose values, when approaching the limits of the operation field of tolerance, would signal slight changes of the technical condition, which are characteristic of the „imminent” unserviceable state. It can be concluded that the exactness of the determination of the diagnostic tolerances determines thoroughness and quality of a diagnosis [1]
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