Quantitative System Reliability and Availability Analysis Using SysML

A SysML library and method for calculating system reliability and availability is described. The method can be used to model and predict reliability and availability early in the design and continue through detailed design and system integration. Values for failure rates, restoration rates, recovery probabilities, and other parameters are stored in specialized reliability blocks that are defined from a single parent reliability block, and equations for reliability block configurations (series, parallel, active/standby, and k out of n) have been implemented and included in the library. The paper includes an example demonstrating the application of the library model elements and how the library can be extended to include additional system redundancy configurations.