RU2368939C2 - Method for installation of structural elements of digital radio electronic means - Google Patents

Abstract

FIELD: radio engineering.

SUBSTANCE: invention is related to the field of equipment design, in particular to algorithms of modules installation sequence in digital radio electronic means. In process of operation of radio electronic means (REM) their serviceability may be deteriorated by effect of electromagnetic fields (EMF). Besides REM themselves and their components may be sources of EMF radiated into external space, which may affect operation of surrounding equipment and components of instruments. Method currently available can not minimise mutual effect of structural elements inside developed device, which may result in reduction of device noise immunity at high and ultrahigh frequencies. Technical result of invention is achieved by the fact that in design of electronic units of digital radio electronic means electromagnet radiation is taken into account, which is created by structural elements (modules) of these units, in the form of particular index of electromagnet interaction between modules, which is produced by measurement of electromagnet radiation spectrum produced by structural elements (modules) of units. Modules in device are installed serially, besides, for another installation from multiple uninstalled modules the one is selected, with which function

is maximised, where F_1i is particular index of i module connection to other modules, F_2i is index of heat mode quality, F_3i is particular index of electromagnet radiation between modules, R1, R2, R3 are weight coefficients.

EFFECT: higher noise immunity of digital radio electronic facilities.

Description

The invention relates to the field of equipment design, and in particular to algorithms for the sequence of placement of modules in digital electronic equipment.

During the operation of electronic equipment (RES) due to exposure to electromagnetic fields (EMF) may violate their performance. In addition, the RES themselves and their components can be sources of electromagnetic fields emitted into the external space, which can affect the operation of the surrounding equipment and component parts of the devices. The best way to solve the problem of noise immunity, to exclude from the very beginning of the design of the device the causes that cause interference.

There is a method of placement of structural elements of digital radio electronic means (CRES), using permutations, which consists in directional optimization of the placement of the modules when fulfilling the criterion of minimizing the total length of all bonds between the elements [1].

The disadvantages of this method are:

firstly, the criterion of minimizing the total length of all connections does not always allow creating a design close to optimal, because it only indirectly takes into account the interconnection of the modules with each other, as a result, a solution is possible in which the connected modules can be spaced apart over large distances, and the space between them may be occupied by connections between other modules;

secondly, for the implementation of the algorithm laid down in this method, an initial arrangement of modules is necessary, the unsatisfactory quality of which can significantly worsen the final result of placing the modules in the device;

thirdly, the method does not allow to minimize the mutual electromagnetic effect of the modules inside the device being developed, which can lead to a loss of operability of the device at high and ultrahigh frequencies.

Closest to the proposed technical solution is a method of sequentially placing modules using the following optimization criteria: the minimum length of the longest bond, the maximum number of bonds between modules located in adjacent positions [1]. The method is implemented in two stages. First, the optimal distances between any i-th and j-th modules are determined taking into account the necessary restrictions. Next, for the next placement, from the set of unplaced modules, choose the one at which the function is maximized

F = F _1i ^R1 · F _2i ^R2 , where F _1i , F _2i are respectively particular indicators of the number of connections of the i-th module with other modules and the quality of the thermal regime; R1, R2 - weighting coefficients [1].

The disadvantage of this method is that the method does not allow to minimize the mutual electromagnetic effects of the modules inside the device being developed, which can lead to a decrease in the noise immunity of the device at high and ultrahigh frequencies.

The technical result of the proposed invention is to increase the noise immunity of digital electronic equipment.

The technical result is achieved by the fact that in the design of electronic blocks of digital electronic equipment, electromagnetic radiation is measured and taken into account, produced by the structural elements (modules) of these blocks, in the form of a particular indicator of the electromagnetic interaction between the modules. The method is based on an algorithm for sequential placement of modules, the essence of which is as follows.

At the beginning, all modules are ordered by a common attribute. For this, the optimal distances between any i-th and j-th modules are determined by the criterion of the minimum length of the longest connection. Calculate the private indicator of the quality of communication (F _1i ). The spectrum of electromagnetic radiation produced by the modules is determined. Calculate F _3i - a particular indicator of the electromagnetic interaction between the modules according to the formula:

where A _ki , A _kj are the frequency components of the spectra for the i-th and j-th modules. The thermal radiation power of the modules is determined and F _2i is calculated - a particular indicator of the quality of the thermal regime.

Further, in the established order for each of the modules, the initial position is determined. Moreover, for the next placement of the set of unplaced modules, choose the one at which the function is maximized:

F = F _1i ^R1 · F _2i ^R2 · F _3i ^R3 ,

where R1, R2, R3 are weights.

Then the process is repeated until the placement of all modules is obtained.

As a result of such placement of the modules in the device, their electromagnetic interaction will decrease, which will increase the noise immunity of the device from internal electromagnetic interference. This is due to the fact that the structural elements of the central distribution center are placed taking into account their mutual electromagnetic influence.

The method was tested when placing the modules of the demonstration electronic unit BD-1. The introduction of a particular indicator characterizing the electromagnetic interaction between the modules (F _3i ) into the objective function made it possible to reduce the level of internal noise induced by radiation from the conductors of neighboring modules by 1.3 times.

The proposed method for the placement of structural elements of digital electronic means allows you to minimize the mutual electromagnetic effect of structural elements (modules) inside the device being developed, which increases the noise immunity of digital electronic means.

Information sources

1. Presnukhin L.N., Shakhnov V.A. Design of electronic computers and systems. - M .: Higher. school., 1986, p. 249, 251-258.

Claims (1)

A method of placing structural elements of digital electronic electronic devices, based on the fact that the modules in the digital device are placed sequentially, according to the criterion of the minimum of the longest connection, taking into account the thermal regime, characterized in that before placing the modules in digital devices, the spectrum of electromagnetic radiation produced by the modules is determined , calculate the partial indicator of the electromagnetic interaction between the modules according to the formula:

,
where A _ki , A _kj are the frequency components of the spectra for the i-th and j-th modules, determine the thermal radiation power of the modules and calculate the partial indicator of the thermal regime F _2i , then in the established order for each of the modules determine the initial position, and for the next placement from the set of unplaced modules, choose the one at which the function is maximized:

,
where F _1i is a particular indicator of the connection of the i-th module with other modules,
F _2i - an indicator of the quality of the thermal regime,
F _3i is a particular indicator of the electromagnetic interaction between the modules,
R1, R2, R3 - weighting factors.