METHOD FOR DETERMINING THE FREQUENCY OF DIAGNOSING SPACE SYSTEMS BY THE ACCEPTABLE LEVEL OF PROBABILITY OF UPTIME 

Sidnyaev Nikolay Ivanovich, doctor of technical sciences, professor, head of sub-department of higher mathematics, Bauman Moscow State Technical University (5 2-ya Baumanskaya street, Moscow, Russia), E-mail: Sidn_ni@mail.ru
Urakova Karina Ayratovna, master degree student, Bauman Moscow State Technical University (5 2-ya Baumanskaya street, Moscow, Russia), E-mail: urakovakarina13@gmail.com 

621.3.019 

10.21685/2307-4205-2020-2-7 

The article presents methods for predicting the reliability of created devices, designing devices with a given reliability and comparing the reliability of various space systems. To this end, fundamental questions from the theory of reliability for the design of space systems, methods for collecting and processing data on the reliability of equipment based on the results of operation and special reliability tests are stated. Methods, mathematical models are developed and an analysis of the structure of the equipment at the design stage and in the manufacture. Design ratios are given for various types of redundancy in tests, extending the life of spacecraft blocks, the basis of which is the methodology for estimating the residual life. The existing methods of reliability analysis are systematized and studied. The problems of uncertainty of information on input data in the calculations by classical methods are described. The influence of the deviation of external influences from the nominal values, the inconsistency of the failure rate, the nonlinear nature of the influence of external factors on reliability are studied. The nature of the influence of external factors on the reliability and degree of consideration of factors in existing methods is investigated. It is noted that the qualitative, organizational and technical (structural and software) reliability requirements specified in the technical specifications for each stage of the creation of elements of space systems as a whole should be fulfilled and confirmed at the corresponding stage of work. Methods of assessing
the resource of technical objects are presented, among which an important place is occupied by methods based on the physical premises of resource consumption. The importance of the economic aspect of the study of the problem of extending the life of space systems is noted. It is postulated that the principle of comparability of the results of quantitative assessments of technical systems involves the use of a single composition of the source data for a certain reporting period of time, the unity of the generalized and particular indicators used, as well as the unity of the assumptions and limitations adopted. It was emphasized that all failures and malfunctions detected at the complex, regardless of whether they affected the test results or not, should be taken into account, information documents should be drawn up on them (reports of malfunctions or complaints, research reports confirmed by research protocols) A systematic approach to the analysis and evaluation of technical systems involves a comprehensive review at each stage of the analysis of generalized and particular indicators of the technical condition as a single system of interrelated variables and decisionmaking based on generalized indicators using the significance of particular indicators. The essence of the methods for determining the periodicity of the technical condition is considered, the conditions of application, as well as the advantages and disadvantages of each method are indicated. The application of the general and element-wise statement of the state assessment of complex mechanisms using the diagnostic matrix and recognition theory in order to determine the state of technical objects is shown. The stages of the general process of diagnosing objects are described, consisting of determining changes in the parameters when exposed to the elements of the object and further processing the results using synthesis and analysis methods. 

reliability, techniques, resource, design, spacecraft, resource assessment