Lifetime cost optimization with time-dependent reliability

Abstract

Product lifetime cost is largely determined by product lifetime reliability. In product design, the former is minimized while the latter is treated as a constraint and is usually estimated by statistical means. In this work, a new lifetime cost optimization model is developed where the product lifetime reliability is predicted with computational models derived from physical principles. With the physics-based reliability method, the state of a system is indicated by computational models, and the time-dependent system reliability is then predicted for a given set of distributions and stochastic processes in the model input. A sampling approach to extreme value distributions of input stochastic processes is employed to make the system reliability analysis efficient and accurate. The physics-based reliability analysis is integrated with the lifetime cost model. The integration enables the minimal lifetime costs including those of maintenance and warranty. Two design examples are used to demonstrate the proposed model.

Keywords:

• product design
• lifetime cost
• reliability

Acknowledgements

This material is based upon work supported in part by the Office of Naval Research through contract ONR N000141010923 (Program Manager: Dr Michele Anderson), the National Science Foundation through grant CMMI 1234855, and the Intelligent Systems Center at the Missouri University of Science and Technology.