Wyniki wyszukiwania - BazTech

1

Heat Transfer Model For Marine Two Stroke Engine Cylinder

Kowalski J., Tarełko W.

Journal of Polish CIMAC

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2007

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Vol. 2, no 1

273-280

EN

This paper deals with modeling of heat flow through cylinder structural components of a marine two-stroke engine. Especially, we paid attention on simulating of temperature distribution for the wet cylinder liner. Multidimensional equations for the transient heat conduction with the Dirichlet and Fourier boundary conditions have been applied. In particular, we applied local values for the convective and radiative heat transfer coefficients using the Fourier boundary conditions determined in a space of cylinder volume and a cooling space of the cylinder. In order to determine the temperature distribution for considered spaces, we applied the radiosity method. Simulation results have been presented in the form of a temperature field for cylinder structural components depended on the crankshaft position angle. Application of the iterative calculation method for solving differential equations of energy balance allowed us for using software easy to get. We carried out all iterative computations using MS Excel spreadsheet. This way, we could decrease the simulation cost significantly.

2

Application of Radiosity Method to Modelling Cylinder Liner Thermal State of Marine Engines

Tarełko S., Kowalski J., Nowaliński S.

Machine Dynamics Problems

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2006

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Vol. 30, No. 4

160-170

EN

To increase the piston engine effectiveness, we should recognize the heat-releasing phenomenon from an engine cylinder volume. Such knowledge should allow us to model and determine the thermal stresses in the individual structural components of a cylinder liner. Having, in turn, information concerning the distribution of the thermal stresses in these components, we could design an appropriate layout of cooling system elements such as cooling curves, rates, surfaces, etc. This paper deals with the modelling of heat flow through cylinder liner structural components of a two-stroke engine. Especially, we paid attention to simulating temperature distribution for the wet cylinder liner. Multidimensional equations for the transient heat conduction with the Dirichlet and Fourier boundary conditions have been applied. In particularly, we applied local values for the convective and radiative heat transfer coefficients using the Fourier boundary conditions determined in space of cylinder volume. In order to determine the temperature distribution for the considered space, we applied the radiosity method. Simulation results have been presented in the form of a temperature field for cylinder liner structural components depending on the crankshaft position angle. Application of the iterative calculation method for solving differential equations of energy balance allowed us to use software easy to get. We carried out all iterative computations using Excel spreadsheet. This way, we could decrease the simulation cost significantly.

3

Optimization using chaotic neural network and its application to lighting design

Nanba R., Hasegawa M., Nishita T., Aihara K.

Control and Cybernetics

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2002

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Vol. 31, no 2

249-269

EN

We have developed a chaotic neurodynamical searching method for solving the lighting design problems. The goal of this method is to design interior lighting that satisfies required illuminance distribution. We can obtain accurate illuminance distribution by using the radiosity method to calculate interreflection of lights. We formulate the lighting design problem that considers the interreflection of lights as a combinatorial optimization problem, and construct a chaotic neural network which searches the optimum solution of the lighting design problem. The calculated illuminance distribution is visualized using computer graphics. We compare this optimization method with the conventional neural network with gradient dynamics, simulated annealing, and the genetic algorithm, and clarify the effectiveness of the proposed method based on the chaotic neural network.