Математическая макромодель вибрации этажерочной конструкции радиоэлектронной аппаратуры
In this paper the method of constructing a macro model the dynamics of stacked bar construction of electronic equipment in the frequency domain based on the finite element method and electromechanical analogy.
Macro model has a dimension equal to the number of variable parameters in the optimization process. This greatly reduces the time optimization with a small number of variable parameters.
The scientific significance of the scientific results outlined in the work is to investigate the mechanisms of formation of contact radio interference that arise as a result of the electromagnetic field of radio transmitters located on aircrafts on current-carrying mechanical contacts of structures with nonlinear and time-varying resistances, as well as the formation of electromagnetic interference. The scientific results obtained as a result of the studies showed the mechanisms of formation of a flowing current caused by induced EMF, along the elements of the airplane structure, which lead to the formation of a radiation mechanism by these elements of the secondary electromagnetic field interacting with the primary irradiating electromagnetic field of the radio transmitter. By registering and analyzing the spectral composition of the electromagnetic radiation of mechanically connected elements of the ES structure, it is possible to control the quality of assembly of the structural elements. Carrying out complex diagnostics based on measuring the spectral composition of the whole product, having the measuring antennas around the product under investigation it is possible to conduct reliable estimates of the quality of assembly of both individual mechanical elements and the entire ES design as a whole. The studies carried out in the work can be put into the development and study of a contactless express method for assessing the quality of assembly and installation of structures. The method is based on the registration and analysis of artificially generated contact jamming under the influence of mechanical vibrations and a high-frequency harmonic electrical signal on the elements of aircraft structures forming a phase-amplitude-modulated oscillation circuit, which are recorded by a spectrum analyzer or a FAM receiver or AM oscillations. In this case, the levels of its spectral components are measured with a change in the frequency of mechanical influences in the range determined by the operating conditions. The measured level of the spectral components of the emitted amplitude-modulated oscillations is compared with the level of the spectral components of the signal emitted by the design of the reference block with given mechanical parameters and having a standardized level of contact interference. The main result of these studies allows us to use the considered in the field of electromagnetic compatibility (EMC) as an undesirable phenomenon, the formation of contact jammers has been used successfully to evaluate the mechanical properties of structures (assessing the quality of their assembly) of a wide variety of aircraft technical devices and devices, including the quality of assembly and installation related to the tightening torque of fasteners).
The methodology of application of circuit simulation programs in the educational process of learning students of information and technical specialties in the system of higher and specialized secondary education is under consideration in the article. There is an example of the use of this methodology for computer simulation and studying the principles of designing and working of the random access memory of the microcomputer using Electronics Workbench.
The article describes the principle of selection parameters model item of electronic equipment, which are to be changed in the optimization process most effectively improves the ratio of price-quality electronic equipment
In this paper the technique of parametric and structural synthesis of systems of maintenance of thermal modes of electronic equipment, as optimality criterion uses the ratio of the price system - the quality (the degree of approximation of the temperature to the desired values). Describes the developed software which allows to obtain practical results through effective selection systems for ensuring the thermal regime at the stage of preliminary design and the detailed design of electronic equipment.
In this paper we propose an optimization model for investment in an advertising campaign of the university. The problem is solved in a limited advertising budget, taking into account the effectiveness of promotional activities.
In article the features of the vibration loads reviewed acting on the radio-electronic means. Also analyzed the method of mathematical modeling of vibration and associated dissipation of mechanical energy. Authors conducted a computational experiment to simulate the dissipation of mechanical energy in the printed circuit assembly and gave a general evaluation of its results.
This volume presents new results in the study and optimization of information transmission models in telecommunication networks using different approaches, mainly based on theiries of queueing systems and queueing networks .
The paper provides a number of proposed draft operational guidelines for technology measurement and includes a number of tentative technology definitions to be used for statistical purposes, principles for identification and classification of potentially growing technology areas, suggestions on the survey strategies and indicators. These are the key components of an internationally harmonized framework for collecting and interpreting technology data that would need to be further developed through a broader consultation process. A summary of definitions of technology already available in OECD manuals and the stocktaking results are provided in the Annex section.