Operational Availability and Reliability Model

The operational Availability and Reliability (OAR) model is designed to evaluate the availability and reliability of systems with components in any combination of series, parallel, and r-out-of-n:G combinations. In terms of the OAR model, systems are composed of Optimal Replaceable Units (ORUs). Failure, corrective maintenance, and spare acquisition probabilities are calculated via random sampling of the ORU failure, corrective maintenance, and spare acquisition distributions. ORU failures are statistically independent and, to allow for versatility in describing system characteristics, ``3-parameter Weibull'' distributed. System availability and reliability are then computed by employing the system failure, corrective maintenance, and spare acquisition data.