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April 10, 2008

Mtg: Reliability Performance and Measures of Repairable Systems

by @ 11:52 am. Filed under ALL, Communications, Computers/Software, Electrical/Power, Electronics Design, Engineering Mgmt

SCV Reliability Chapter
Speaker: Dr. Wendai Wang, Applied Materials
Time: Refreshments at 6:30 PM, presentation at 7:00 PM
Cost: none
Place: HP Oak Room, Bldg 48 (Hwy 280 at Wolfe Rd), Cupertino
RSVP: not required

Many multi-component systems such as automobiles, computer servers, production & industrial equipment, appliances, engines, and power systems are generally repairable in service. ? It is also known that reliability performance metrics and analysis methodologies for non-repairable systems versus repairable systems are quite different. ? You would be surprised that the reliability theory for repairable systems is so underutilized. ? Most reliability engineering practices for repairable systems were directly adapted from methodologies for non-repairable systems, which are â??well??? developed. ? Many assumptions are commonly used, consciously or unconsciously, in engineering practices, such as exponential distribution for the â??time between failures??? (TBF) and even for the â??time to restore??? (TTR).

Traditional reliability theory (which primarily applies to non-repairable systems) is built upon the fundamental (random) variable of the time to failure (TTF). ? The TTF distribution defines all reliability metrics mathematically and practically. ? Similarly, should the behavior of both time between failures (TBF) and time to restore (TTR) together describe the reliability performance of a repairable system?

Because of the complexities associated with modeling of repairable system reliability, most research studies have only focused on evaluating the limiting statistical values such as steady-state system Availability, steady-state system MTBF, and etc. These limited evaluations, in turn, are typically based on one of the stationary Stochastic Point Processes such as Homogeneous Poisson Process, Non-Homogeneous Poisson Process, Renewal Process, Markov Process, and Regeneration Process – basically a certain level of â??renewal??? at the system level. In reality, maintenance activities, such as repairing, refurbishing and replacing, are really taking place at the module level. Reliability performance of a multi-component repairable system is actual an assembly of realizations for of all components.

This seminar will start with some case studies on the behavior of both TBF and TTR of simple repairable systems and of multi-component repairable systems, from which some simple conclusions are drawn and should be applied directly in engineering practice. ? Reliability performance and measures for repairable systems are then presented and discussed.

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