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Методика расчета показателей надежности типа ресурс для составных частей систем мобильной связи с учетом уточненного значения коэффициента вариации
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.