Cost benefit analysis of series systems with warm standby components
This paper deals with the cost benefit analysis of series systems with warm standby components. The time-to-repair and the time-to-failure for each of the primary and warm standby components is assumed to have the negative exponential distribution. We develop the explicit expressions for the mean time-to-failure, MTTF, and the steady-state availability, AT(∞) for three configurations and perform a comparative analysis. Under the cost/benefit (C/B) criterion, comparisons are made based on assumed numerical values given to the distribution parameters, and to the cost of the components. The configurations are ranked based on: MTTF, AT(∞), and C/B where B is either MTTF or AT(∞).
Optimal redundancies for reliability and availability of series systems
Abstract Five different series system configurations with standby units are compared based on their overall reliability and availability. The time-to-failure of a component and its repair time are assumed to have the negative exponential distribution. The mean time-to-failure, MTTF, and the steady-state availability, A T (∞), are obtained for the first three simple configurations and comparisons are performed. For all five configurations, comparisons are made based on assumed numerical values given to the distribution parameters, as well as to the cost of the components. The configurations are ranked based on: MTTF, A T (∞), cost and cost-benefit where benefit is either MTTF or A T (∞).
Cost analysis, availability and MTTF of a three state standby complex system under common cause and human failures
Abstract The paper deals with the pointwise availability, steady state availability, MTTF and variance of the time to failure of 3 state, 1-out-of-2 unit systems with cold standby, under common cause and human failures. The cost function analysis is also to get the expected gain over the time. Several graphs are presented to interpret the results.