Оценка долговечности СВЧ-транзисторов
The question of ensuring reliability, especially of durability of mobile communication systems on the stage of planning, is considered in this paper. The purpose of this work is rising quality of projection radio engineering devices (their components) of mobile communication systems. Research of real methods for calculating the indicators of longevity radio engineering devices was conducted for aim achievement. They have some disadvantages, because according to industry standards 4.012.013-84 they use constant value of variation coefficient in mathematical expression. Unified method in the form of IDEF0-diagram was proposed for elimination of defects. It allows to remove quantification of the durability of the constituent parts of the mobile communication systems of «resource» type. Method consists of five successive steps: the formation of source data, updated calculation of variation coefficient, calculation of storage time, evaluation of complex load factor and calculating of indicators of «resource» type. Notably attention is paid to calculating of updated variation coefficient, which makes a significant contribution to the result. It was detected that it is necessary to apply complex load factor in mathematical expressions in the evaluation of resource of radio engineering devices of mobile communicational systems, because it considers both electrical load and temperature, which is explained by the thermally dependent electrical parameters of electrical components. A summary table of the mean group value of the coefficient of variation for certain subgroups of electrical components was compiled. This table is accessory to counting indicators of durability of «resource» type if the necessary electronics are not available in handbooks about reliability. The calculation of the quantitative values of the durability of the video transmitter with the construction of visual dependencies of gamma-percent resource on the complex load factor was completed. Dependences that have been obtained mirror underestimation of gamma-percent resource with the method which is given in industry standards 4.012.013-84 compared with the proposed. It is recommended to integrate the results of research into methodology of calculating of reliability indicators of «resource» type of components at enterprises and research institutes engaged in the development of mobile communication systems.
The article discusses the application of statistical modeling for the durability prediction of electronic equipment. Durability indicators are one of the important characteristics of onboard electronic equipment of spacecraft with long terms of active existence. The purpose of the study is to improve the quality of design work by improving the method of calculating the life of electronic equipment, taking into account the probabilistic characteristics of the life components of its electronic components. The object of the study is a typical procedure for calculating the life of electronic equipment at the design stage from data on the characteristics of the durability of electronic components. The subject of the study are methods, models and algorithms applicable to the analysis of the design level of the durability of electronic equipment. To study the effectiveness of statistical modeling, software was developed and the reliability of its work was tested. With the help of this software, computational experiments were carried out. Comparison of the results of statistical modeling and calculations by a typical methodology made it possible to identify a number of significant limitations of the deterministic method. In the standard methodology, it is assumed that the variation coefficient of life is a constant for all electronic components. But the analysis of Data Sheet of electronic components has shown that the values of the variation coefficient can be different for electronic components of different types. The calculations have confirmed the need to take into account the values of the variation coefficient of life in predicting the durability of electronic equipment. In addition, in the standard methodology it is assumed that the life of electronic equipment that contains electronic components with the same life values will be equal to the life of electronic equipment that contains only one such electronic component. Computational experiments have shown that the life of electronic equipment that contains electronic components with the same life values will be less than the life of electronic equipment that contains only one such electronic component. Based on the studies, the scope of the standard methodology was determined and the effectiveness of statistical modeling was proved. However, the results obtained by the statistical modeling method should be corrected by the results of the tests and the controlled operation of electronic equipment.
The monograph presents the Proceedings of the School of modeling , information technology and automated systems (NS Mitas ) A.S.Shalumova Professor and Scientific School " ASONIKA " Professor Yu.N. Kofanova Considered a range of issues related to the creation of an automated system to ensure reliability and quality equipment ASONIKA , virtualization testing and resistance to destabilizing factors in the operation of electronic equipment on the basis of ASONIKA : ensuring electromagnetic compatibility; finite element modeling and optimization of mechanical processes ; resistance raddioelektronnyh funds to mechanical vibration isolators vzdeystviyam estimation of time to fatigue fracture conclusions radioelements , the definition of reliability and durability , analysis and control of the thermal characteristics of structures , development of database system ASONIKA .
The article deals with the issue of reliability, namely the durability of computer engineering. The methodology of the refined estimation of durability indicators of computer engineering in the IDEF0-diagram format is developed. The example of usage of the developed methodology is given. The object of research the graphics card of the AMD Radeon type is chosen. A summary table of the mean group value of the variation coefficient for the subgroups of electrical components, which are part of the selected graphics card, is formed. A comparison of the numerical values of the gamma-percentile operating life of the graphics card, taking into account the different values of the coefficient of variation, was made. The influence of the coefficient of variation on the value of gamma-percentile operating life is considered. The methodology allows obtaining more accurate values of durability indicators and thereby increasing the reliability of the calculated assessment of durability characteristics.
The project developed the climate control system, which will be used to study the durability of electronic components parameters