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Multiparameter approximation model of temperature conditions of marine diiesel generator sets, based on Markov chain Monte Carlo

Myrhorod V., Hvozdeva I., Budashko V.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2022

Vol. 16 No. 4

779--784

In the article we propose a multi-parameter approximation model, based on Markov chain Monte Carlo, which describes the relationship between the temperature regime, operating conditions and electromechanical parameters of marine diesel generator sets. The approximation model is constructed on the basis of the analysis of experimental data of the exhaust gases temperature of marine diesel generator sets in their long-term operation. As a statistical model of random processes of temperature deviations from the approximation model, a Markov process model is proposed that takes into account the possible correlation of the initial data. Since the measuring channels of modern diagnostic systems are digital, due to discretization in time and level, the studied processes form a Markov chain, which makes it possible to establish the important features of such processes. The use of approximation models ensures the stationarity conditions and the correctness of the proposed Markov model in the conditions of multi-mode operation of marine diesel generator sets. The proposed multi-parameter approximation model, based on Markov chain Monte Carlo, allows you to take into account random perturbations that lead to a random change in the output coordinates of the diagnostic object. The proposed improvement of the model makes it possible to ensure its adequacy to real processes of changing the parameters of the temperature regimes of marine diesel generator sets. The proposed multi-parameter approximation model, based on Markov chain Monte Carlo, can be used in the systems of technical diagnostics of marine diesel generator sets in order to increase the reliability of diagnostic conclusions.

Research on energetic processes in a marine diesel engine driving a synchronous generator for diagnostic purposes Part 1 – physical model of the processes

Cwalina A., Zacharewicz M.

Journal of Polish CIMAC

2013

Vol. 8, no 1

97--104

In the paper a physical model of certain processes taking place when marine diesel engine is driving a synchronous generator is presented. This physical model will be a basis for a mathematical model realization in a form of equations describing the relationships between the designated parameters of the diesel engine and the generator. The method of theoretical and operational investigations which enables identification of the technical condition of the set is presented. Systematic collecting the results in the database will allow to refine the model, and to conclude about the technical condition of real objects.