Lifetime Cost Optimization with Time-Dependent Reliability


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. © 2013 Taylor & Francis.


Mechanical and Aerospace Engineering

Keywords and Phrases

Computational methods; Optimization; Product design; Random processes; Reliability; Reliability analysis; Computational model; Extreme value distributions; Lifetime costs; Physical principles; Product lifetime; Reliability methods; Time dependent reliability; Time-dependent systems; Costs

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Document Type

Article - Journal

Document Version


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© 2014 Taylor & Francis, All rights reserved.

Publication Date

01 Oct 2014