Definition of density of the thermal stationary streams on a surfaces of a sleeve of cylinder internal combustion engine by a method of optimum filtration kalmana

V. H. Zarenbyn

Abstract


Problem statement. At research warmly intensity and thermal weariness of internal combustion engines (ICE) the knowledge and the analysis of local temperatures and thermal streams in the basic details forming the chamber of combustion is defining. Theoretically the problem consists in the decision of the equation of heat conductivity at the set features of course of thermal processes on border of bodies. Thus there is a problem of accuracy of the decision since it depends on accuracy of the task of real boundary conditions which can be received only by means of physical experiment and corresponding metrological maintenance. Unlike temperature the thermal stream cannot be measured directly, therefore it define on a difference of temperatures (thermal gradient a method) or a calorimetric method. Definition of density of streams with the help as named gauges of a thermal stream when the measured temperatures are used at the decision of a return problem of heat conductivity for chosen thermometric an element is most extended. In this case, except the requirement of one-dimensionality of distribution of temperatures, linearity and the minimum distortion of temperature fields of thermal system, there are considerable difficulties of calculation derivative of the measured temperature. To perspective it is possible to carry methods of researches which it is accepted to name cybernetic diagnostics or identification of systems. Their essence consists that the deformed information on object is compared to its mathematical model and then are defined its condition, parameters or entrance influences by minimization of square-law function are nonviscous. In work definition of density of thermal stationary streams on surfaces of a sleeve of cylinder ICE by a method of optimum filtration Kalmana and also an estimation of their reliability and accuracy is made. Possibility of application of filtration Kalmana is shown at experimental researches in ICE.

The purpose. Definition of density of stationary thermal streams on surfaces of a sleeve of cylinder ICE a method of optimum filtration Kalmana, and also an estimation of their reliability and accuracy.

Conclusions. Possibility of definition of density of stationary thermal streams by a method of optimum filtration Kalmana for the developed model of a heat transfer through cylinder ICE sleeve is shown. Results of mathematical modelling have shown constant stability and convergence of identification with definitive limiting relative errors of estimations of the maximum density of a thermal stream and factor of approximation not exceeding 5 %.


Keywords


a sleeve cylinder ICE; a density thermal stream; filtration Kalman; reliability; accurac

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