Оптимизационные модели термоэлемента Пельтье и тепловой трубы
The article discusses the thermal model of Peltier element and a heat pipe intended for inclusion in the overall thermal model design of electronic equipment to optimize system parameters to ensure its thermal regime. Models are constructed on the basis of experimental data of the manufacturer and contain the minimum number of adjustable parameters.
The article suggests and describes a laboratory stand, allowing analysis printed board assembly electronic equipment (low-frequency amplifier) with the aim of monitoring the technical condition and diagnosis. This method has been implemented stand "Troubleshooting Handbook." The stand is designed for laboratory work by students in the course "means and methods of technical diagnostics."
The article considers the questions assessing the reliability of mechanical components used in the electronic equipment in the early stages of design. The calculations of failure rates springs shock absorbers according to various methods. It is shown that the use of models failure rates of mechanical elements, taking into account the peculiarities of their structural and technological performance, not only allows us to solve the problem of calculating, but also to ensure the required level of reliability and mechanical components, and containing electronic equipment.
The quasi-3D BGA package thermal model is proposed. The general 3D heat transfer problem is correctly transformed to the set of 2D equations for temperature distribution in different layers of BGA package construction. It is shown that quasi-3D model provides the reasonable accuracy for standard and thermally enhanced BGAs. The software tool OVERHEAT-BGA is developed to obtain an numerical solution with considerably (6 – 10 times) reduced CPU time in comparison with universal 3D simulators.
The good agreement between designed and measured temperatures for standard and XP BGA packages is achieved.
This paper presents method that allow to extend computer-aided design of radio-electronic devices and to automate choosing process of thermal regime and temperature control systems for electronic chips and entire device. That process both structural and parametrical optimization is determined as a thermal regime system synthesis. We consider various classes of on-board aerospace and mobile military devices sensitive to mass and dimension. The study proposed a new optimal design criterion of thermal regime systems and suggested mathematical expediency estimation rank for every parameter changing on every optimization step.
In this paper the comparative characteristics of the РС ASONIKA-K and PМ of reliability calculations are given.
Generalized error-locating codes are discussed. An algorithm for calculation of the upper bound of the probability of erroneous decoding for known code parameters and the input error probability is given. Based on this algorithm, an algorithm for selection of the code parameters for a specified design and input and output error probabilities is constructed. The lower bound of the probability of erroneous decoding is given. Examples of the dependence of the probability of erroneous decoding on the input error probability are given and the behavior of the obtained curves is explained.
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostructures and some problems related to modeling and radiation testing of such structures are considered.
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.