Technical science and innovation


Methods of increasing the reliability of components and assemblies of control systems for technological processes and production, as well as methods of using fault-tolerant architecture and redundancy are analyzed. A methodology for assessing the reliability of software (SW) of an automatic control system for technological processes and production is proposed. A mathematical model for assessing the reliability of software is obtained by extending methods for assessing the reliability of hardware to software, taking into account the specifics of the latter. In this case, reliability is understood as the faultlessness of the program, and the main focus is on testing and debugging software in order to identify and correct errors. The mathematical model of software reliability is based on the well-known predictive model, which is based on the assumption of the independence of failures and the exponential distribution of time between failures. The software reliability model takes into account the parameters of the software structure (the number of types, groups of software modules N), the means of implementing the modules (programming language, development environment), which determine the value of the module failure rate; time of formation of the result and the number of detected errors. It is shown that the assessment of the software reliability of the control system is carried out at the design stage when choosing the structure and means of software implementation using expert assessments as model parameters. The mathematical model of the research object allows to assess the reliability of the software: at the design stage, the control system; when choosing the structure and means of software implementation; in the development and debugging of software, as well as in the process of operating the control system.

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