Cyber physical systems-reliability modelling: critical perspective and its impact

The main aim of present work is to investigate the reliability measures of cyber physical systems. Cyber physical systems care very complex systems as these are configured using several cyber and physical subsystems. So, reliability of CPS systems become very critical aspect for these. For this purpose, a novel reliability model is formulated for cyber physical systems. The concept of cold standby redundancy for subsystems namely analog component, sensors & actuators, and distribution system has been implemented. All the random variables associated with failure and repair rates of various subsystems followed exponential distribution. The switch devices and repairs are perfect. All random variables are identically and independently distributed. Markov birth–death process is applied to derive the Chapman–Kolmogorov differential-difference equations. Numerical value of system availability is derived using Runga–Kutta method of 4th order. It is revealed that subsystems with provision of redundancy are very less effected by variation in failure, repair, and time. Though the subsystem like physical environment is highly influenced by variation in failure rate and time. So, it is concluded that special attention should be given to such subsystems.

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