Учёт герметизации при расчёте надёжности функциональных узлов космических аппаратов
equipment needed it sealed. Sealing is ensured by
Gasket, which are reliable, and owing to a failure intensity.
Gasket failure rate depends on many different factors, counting
which is needed to calculate thereof. However, this calculation is not
trivial task for this need to be used more modern
sources of information.
For the effective functioning of the onboard avionics, require sealing. Gasket failure rate directly affects the probability of successful operation of the device in a sealed condition. Gasket failure rate, in turn, depends on many factors.
The publication contains materials of the conference dedicated scientific-technical problems in the field of Radioelectronics, telecommunications and computer engineering.
The publication is intended for researchers, engineers and graduate students.
The standard procedures used in the engineering practice for the dependability prediction of electronic equipment (analytical methods) have a number of significant limitations. Turning to numerical methods, allowing the removal of these limitations, causes the necessity to create the failure model of electronic components for the dependability prediction of electronic components. The aim of the present research is to improve the design work quality by improving the dependability prediction of electronic equipment, taking into account the reliability, durability and storability of electronic components. To develop the failure model, the methods of the dependability theory, the probability theory and computational mathematics have been developed. A failure model of electronic components, representing the functional, linking the implementation of the running time and the base random variable, has been created. In this case, the model parameters have been calculated on the basis of the data on dependability characteristics of their dependencies on the modes and conditions for using the electronic components, as shown on a specific example. Unlike the standardized failure model of electronic components, the proposed model permits simultaneously to take into account the limitations, imposed by the characteristics of reliability, durability and storability, normalized in the Data Sheet.
The monograph contents totaled the many years results of Scientific school «The Automated System for Ensuring of Reliability and Quality of Equipment - ASONIKA» National research University «Higher school of Economics» (scientific supervisor of the Scientific school - academician of RANS, doctor of technical sciences, professor YU. Kofanov) and long-term cooperation with the scientists of Kiev Institute of mathematical machines and systems problems of the Ukrainian National Sciences Academy (Deputy Director on science, doctor of technical sciences V.P. Strelnikov). The final structure of the monograph had been formed in the discussion of modern problems of reliability aerospace electronic equipment at the XVII International scientific-technical conference «Systemic problems of reliability, quality, mathematical modelling, information and infocommunication technologies in innovation projects». This conference was dedicated to the 20th anniversary of the HSE. The book outlines the basics of probability-physical approach to the study and the assessment of the reliability of onboard aerospace equipment. Presents the methods of estimation of reliability parameters of electronic components, as according to reference data and test or operating results in the presence or absence of failures. Developed the methods of calculation of reliability parameters of mechanical elements of aerospace equipment as well as research methods reliability of redundant and non-redundant, non-renewable and renewable systems on the basis of adequate two-parameter distributions of diffusion. Established the theory of planning reliability test with lightweight, durable, including accelerated testing with new methods of processing the testing results and reliability assessment. We propose new methods of evaluation and prediction of the aerospace equipment reliability to measure the determining parameters. Developed methodology of the statistical characteristics evaluation of the degradation process for the study of single samples of aerospace equipment using information about its representative minobject (minibranch, mineralizatsiya). All problems of reliability, which is solved in this book (mathematical modeling, calculation and experimental evaluation of the reliability of systems) result in the identification of the time until failure (or to failure) distribution. It is proved that when assessing the reliability of onboard aerospace equipment, most accurate results diffusion DN-distribution. On the basis of the law of distribution can be carried out the evaluation of all the necessary parameters of aerospace equipment reliability (mathematical expectations developments, gamma-interest developments, the probability of non-failure operating time for the specified time, the residual resource and others). The book provides a large number of examples and problems, proving the effectiveness and efficiency of the proposed methods. Material monograph mostly taught HSE in the various courses of lectures. The monograph is intended for a wide circle of specialists working in the field design, testing and operation of onboard aerospace equipment, as well as students and graduate students of the HSE in the execution of their coursework, independent scientific research, and the preparation of graduation theses and dissertations.
The method of optimization of systems to ensure thermal regimes REA (TCS), which as a model of heat transfer method uses electrothermal analogy and relies on the criterion of optimal design RESEARCHER. The criteria taken into account by the ratio of costs to sell is the amount of the value of the system elements RESEARCHER, the cost of power consumption and the amount of weight applied RESEARCHER to produce effects (qualitative assessment) is the deviation of temperature on the cooled element from the set of values to ensure the required reliability.
This paper considers the optimization of the parameters of the radiator and installed in the cooler by the expert criterion of minimum cost while restrictions on the provision of the given thermal conditions and parameters.
Constant growth of spacecraft operating life requirements leads to creating equipment which fits these requirements. From this point of view, specifically durability prediction allows to evaluate the potential of creating equipment with a long operating life. On early stages of equipment’s development analytical methods of durability prediction are used. Obviously, the more precise the estimation is, the more likely that the practical test will confirm the durability predictions. Therefore, improving the engineering techniques of the durability prediction is a relevant problem.
The objective of this research is to improve the quality of design work by enhancing the engineering techniques of the durability prediction, which raise the authenticity of the evaluations.
Life of the equipment are calculated using the statistical modelling method (Monte-Carlo method). This method takes into consideration probabilistic characteristics of constituent elements’ life.
As a result, the problem of predicting operating life of electronic equipment using the reference data on early stages of development is solved. An analysis of standardized method of durability prediction was performed which revealed existing limitations for using this method when predicting operating life of electronic equipment. An alternate, statistical method of predicting operating life of electronic equipment was suggested and a software implementation was created. Developed software was tested and verified. Analytical experiments were performed to show the authenticity of the suggested method and to compare it to the standardized one.
Thus, results of the performed research show that the standardized method is applicable only for calculating the minimum operating time. Also, it was concluded that the truncation parameter of element’s life distribution, variation coefficient of life and some specific qualities of dependability prediction scheme have to be taken into consideration when predicting durability of electronic equipment.
The described method and algorithm for automatic synthesis of systems vibrodiagnostic while broadband random vibration and shock impacts on the design of electronic equipment. In carrying out the process of optimization of the system parameters vibrodiagnostic in vibro-impact creates a common basis for summation vibration and shock - spectral density effects. Shock impulse, given in the time domain translates in spectral shape (spectral density overload) using a direct Fourier transform. The calculation of the overload on the structure and deformation vibration isolators in vibro-impact produced using the inverse Fourier transform of the transition from a spectral representation of a reaction to a temporary. To optimize a global optimality criterion that takes into account the requirements for efficient installation of system of vibrodiagnostic and weakening of the shock and vibration effects on the construction in which the possible values of operating temperatures. The described algorithm was developed PC program.