Reliability analysis of hybrid redundancy systems

The paper presents a new approach to the reliability evaluation of redundant systems. The exact logic design of the switches is analysed in order to distinguish between fatal and nonfatal faults in the switching logic. System unreliability is then calculated by summing the probabilities that unrecoverable faults occur. In addition to the more accurate reliability evaluation achieved by the new approach, it is also useful for comparing various designs of the switching logic or different switching strategies.