Method of nonlinear digitization of a grid of final elements in the engineering analysis of Radioelectronic Systems thermal modes

Object of research in the given work is the method of nonlinear digitization of a grid of final elements with reference to the analysis of thermal modes of small-sized radar stations (SSRS).

The given work sets as the purpose decrease in dimension of thermal model with use of nonlinear digitization of a grid of final elements at preservation of the set accuracy of the decision. The primary goals of research thus are: an estimation of accuracy of the received decision on the basis of comparison of experimental data with the data received at calculation of thermal model of the device with use of a method of nonlinear digitization; an estimation of speed of the settlement program (time spent by the computer for reception of the end result). At use of a method of nonlinear digitization four areas of regulation of a step of a grid of final elements are allocated: area D1 - represents a surface of a source of heat, area D2 - a near zone of a source of heat, area D3 - a zone removed from sources of heat, area D4 - interactions of thermal fields of the next sources of heat. In work settlement parities for calculation of a step of a grid in each of the listed areas are resulted.

As a result of a quantitative estimation of efficiency of application of a method of nonlinear digitization of grid FE, at comparison of experimental data with settlement for five radio-electronic devices (video card FX5200, assemblage of blocks AFAR, block RES of demountable type, motherboard ASUS) it is established that:

- Use of a method of nonlinear digitization of grid FE allows to accelerate on the average process of calculation of indicators of a thermal mode in 1.5 - 3 times at the expense of decrease in dimension of thermal model (total of final elements in model) in 2... 4 times.

- Decrease in accuracy of results of calculation of indicators of thermal modes doesn't exceed 0,4 - 1.5 % of percent. Thus high efficiency of use of a method of nonlinear digitization of a grid of final elements is revealed at the analysis of thermal modes of radio-electronic devices.

The decision of similar problems also is considered in articles and A.A.Aljamovsky's books with reference to modeling of physical processes of transfer of heat by means SAPR.