University Events

Description: TOPIC: IMPACT OF CORRELATED COMPONENT FAILURES ON MAINTENANCE POLICIES FOR FAULT-TOLERANT SYSTEMS

LOCATION: Lester W. Cory Conference Room, Science & Engineering Building (Group II), Room 213A

ABSTRACT:
The primary goal of maintenance is to minimize the risk and consequences of component and system failures. Maintenance actions can be divided into two subcategories: (i) Preventive Maintenance (PM) at predetermined time intervals prior to failure and (ii) Emergency Repair (ER) upon failure, where ER >> PM with respect to cost or downtime. Many maintenance models have been developed over the past several decades. However, most of them assume component failures are statistically independent. This assumption simplifies the calculations, but is especially dangerous for safety critical maintained systems because correlated failures can lower the mean time to failure and increase the probability of ER. We study the impact of correlated component failures in the context of five maintenance policies, including: (i) periodic group repair based on operation time, (ii) preventive maintenance: minimal repair with complete renewal model, (iii) periodic preventive maintenance: minimal repair with partial renewal, (iv) age replacement to minimize cost, and (v) age replacement to maximize availability. Examples illustrate that our approach identifies optimal maintenance strategies despite the presence of correlated failures.

NOTE: All ECE Graduate Students are ENCOURAGED to attend.
All interested parties are invited to attend. Open to the public.

Advisor: Dr. Lance Fiondella

Committee Members: Dr. Liudong Xing, Department of Electrical & Computer Engineering and Dr. Firas Khatib, Department of Computer and Information Science

*For further information, please contact Dr. Lance Fiondella at 508.999.8596, or via email at lfiondella@umassd.edu.