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The modern approach of the exploration of dynamic characteristic of elements or system of some device has been enabled by system dynamics. System dynamics is an excellent software system for studying the dynamic of the behaviour of natural, technical and societal realities i.e. system of various natures and features in which there exist relatively high analogy rate. The methodology of its work, including even the use of digital computers has shown to be an efficient mean for solving the problems: management, behaviour, sensitivity, flexibility and studying of dynamics of the behaviour of the systems of high complexity by computer simulation, in laboratory what means without danger for the realities observed. For the usage of system dynamics in the solution of complex problems, various complex knowledge from various scientific disciplines are required, but good knowledge of the nature of the problem itself, which is being analyzed. The paper has analyzed dynamic characteristic of cooling system in marine diesel engines by means of system dynamics. The cooling system of propulsion of MDE is a complex system onto which various disorders act and due to their changeable act result into the changes of working temperature of MDE. System dynamic approach in the analysis of MDE enable us to obtain the answer to the question "What if…" in other words we arrive at the solution what the reaction would be at the changes of any variable in the cooling system. The paper has shown: dynamic and static regime of work, mathematic model of the cooling system of MDE, simulation model in POWERSIM programme language and diagrams of the flows of water. [ABSTRACT FROM AUTHOR]

Availability of propulsion diesel engine such as power or any other characteristics, under different exploitation conditions is determined by calculations, and is confirmed by empirical methods. Computer simulation models are very important for such analyses. The computer-simulation model of ship propulsion diesel engine based on mathematical model has been presented in the work [1]. The model is applied in the analysis of the static and dynamic operating conditions of the turbo-charged slowspeed diesel propulsion engine and the fixed blade propeller. The model was created by applying computer program MATLAB 7.0.4.-SIMULINK, and according the detailed mathematical zero-dimensional model. In this paper, the aimed model is used for analyzing the influence of the power changing of one of the cylinder on the engine performance. The power changing has been simulated by cutting of fuel delivery to one cylinder under different loading conditions and by the different limit of fuel rack. By analyzing the results of the simulation, the limits of engine working parameters and safety boundary conditions have been determined. [ABSTRACT FROM AUTHOR]