Odarushchenko O. Methods and means for ensuring reliability and functional safety of instrumentation and control systems with considering the physical and design defects of the components

Based on the development of von Neumann's paradigm and the hypothesis of the possibility of building reliable and functionally safe systems from insufficiently reliable software and hardware components, a methodology for assessing and ensuring the reliability and functional safety of I&Cs by describing their information and technical condition, improving the principles of risk reduction and assessment its violations due to design and physical defects and defects of interaction taking into account the variability of the parameters of the flows of failures and recoveries, which provides an increase in the accuracy of estimating the required indicators. Probabilistic models for assessing the reliability of software (SRGM - software reliability growth models) by taking into account secondary defects have been improved. A method for assessing the reliability and functional safety of I&C with structural-version redundancy has been developed, which provides an increase in the accuracy of calculating the readiness function and the probability of failure for a common cause. Models for assessing the readiness and functional safety of I&C on self-diagnostic platforms and a method for ensuring functional safety by using different options for version redundancy (diversity), which increased the accuracy of estimates to 5%. Methods of verification and validation of software platforms and I&C based on them and the resulting method of evaluation and ensuring the reliability and functional safety of I&C, which accumulates all previous scientific results and their benefits, have been developed. It allows to carry out complex estimation of the specified properties and provides achievement by systems of a level of functional safety of SIL-3. The obtained results allowed to solve the scientific and applied problem of complex evaluation and ensuring the reliability and functional security of software and hardware complexes of information and control systems of critical application. Keywords: information control systems, software and hardware complexes, reliability and functional safety, hardware, software tools, set of defects, software design defect, software reliability models.