COST ANALYSIS OF A TWO-UNIT ELECTRONIC PARALLEL REDUNDANT SYSTEM WITH OVERLOADING EFFECT.

A two-unit parallel redundant repairable electronic system with exponential failure-time distribution and overloading effect is considered. The system is to be in any of three states: good, degraded and failed. One repair facility is available when the system is either in degraded or failed state. The repair for the system in any state follows a general distribution. To make the system more applicable to practical life problems, time dependent probabilities have been evaluated so as to forecast the expected profit and operational availability of the system at any time. Using supplementary variable technique, Laplace transforms of various state probabilities have been evaluated. Making use of Abel's theorem, various time independent probabilities have been computed. The overloading effect for the expected profit on the operational availability of the complex system has been studied.