Reliability Evaluation of Wired Tripled Control Channel for Common, Separate, and Mixed Cable Jackets

: pp. 15 - 24
Lviv Polytechnic National University
Lviv Polytechnic National University, Ukraine
Lviv Polytechnic National University

Aim. To develop an approach for quantifying the reliability of the wired tripled control channel with common, mixed, and separate cable jackets. Method. Reliability is formalized using block diagrams and dynamic fault trees. Static and dynamic models have been developed to evaluate the reliability indicators of the wired control channel with triple redundancy. The basis for obtaining these models is the state and transitions diagram. Static models are formed using logical-probabilistic expressions. Dynamic models are based on the principles of Markov analysis. Results. For the core failure intensity, which is higher than the intensity of the cable jacket failure, it is shown that a separate cable jacket provides the highest reliability, and a common cable jacket provides the lowest. Accordingly, the mixed cable jacket in terms of reliability occupies an intermediate position with a slight approximation to the separate. Reliability indicators calculated from static models are understated in all three cases compared to those calculated from dynamic models. Although static models give less accuracy, they do not require the structure of sophisticated Markov models. Scientific novelty. The approach for modeling the reliability of control channels with triple core redundancy for cases of separate, mixed and common cable jackets has been improved. Practical significance. The proposed approach is recommended to be used to assess the reliability during the equipment design, the operation of which may endanger the life and health of service personnel. The obtained results are a mathematical basis for studying the reliability of a wired cable channel with three cores, which are protected by reinforcement and cable jacket in different combinations.

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