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The Scientific World Journal
Volume 2013, Article ID 415327, 7 pages
Research Article

Reliability Evaluation Based on Different Distributions of Random Load

1Department of Chemical Mechanical Engineering, Liaoning Shihua University, Liaoning 113001, China
2Department of Mechanical Engineering and Automation, Northeastern University, Liaoning 110004, China

Received 18 August 2013; Accepted 18 September 2013

Academic Editors: S. Kou and A. Szekrenyes

Copyright © 2013 Peng Gao and Liyang Xie. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The reliability models of the components under the nonstationary random load are developed in this paper. Through the definition of the distribution of the random load, it can be seen that the conventional load-strength interference model is suitable for the calculation of the static reliability of the components, which does not reflect the dynamic change in the reliability and cannot be used to evaluate the dynamic reliability. Therefore, by developing an approach to converting the nonstationary random load into the random load whose pdf is the same at each moment when the random load applies, the reliability model based on the longitudinal distribution is derived. Moreover, through the definition of the transverse standard load and the transverse standard load coefficient, the reliability model based on the transverse distribution is derived. When the occurrence of the random load follows the Poisson process, the dynamic reliability models considering the strength degradation are derived. These models take the correlation between the random load and the strength into consideration. The result shows that the dispersion of the initial strength and that of the transverse standard load coefficient have great influences on the reliability and the hazard rate of the components.