A. Munitic, M. Orsulic, J. Dvornik, and L. Milic (Croatia)
System Dynamics, Modelling, Asynchronous Engine, Windlass, Continuous and Discrete Simulation
System- dynamic simulating modelling is one of the most appropriate and successful scientific dynamics modelling methods of the complex, non- linear i.e. natural, technical and organizational systems. Investigation of behavior dynamics of the ship’s propulsion system as a typical example of complex, dynamic technical systems requires application of the most efficient modelling methods. Since 1991 to 2001 in elaborating the degree essays with the College of Maritime Studies in Split, system- dynamic computing simulating methodology has been used for modelling of most non-linear ship borne electro-energetic, thermodynamic, hydraulic, mechanical and pneumatic systems. The aim of this essay is to present the efficiency of application of the system-dynamic simulating modelling in investigation of behavior dynamics of the propulsion systems. In this case, the anchor windlass and its driving asynchronous motor shall be presented by mental- verbal, structural and mathematical computing models. The System Dynamics Models are, in essence, continuous models because the realities are presented by the set of non-linear differential equations, i.e.” equations of state”. They are at the same time discrete models, because they used basic time step for counting i.e. discrete sampling DT, which value is determined in total accordance with “SAMPLING THEOREM” (Shannon and Koteljnikov). With the choice of basic time step DT it is possible to do computer modelling of continuous simulation models on digital computer, which is very suitable for education of the marine students and engineers, because they can study complex dynamics behavior of marine systems and process.
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