Forum: Reliability & Maintainability Questions and Answers
Topic: Reliability & Maintainability Questions and AnswersTopic Posted by: Reliability & Maintainability Forum (email@example.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Original Message:Posted by:Rob (firstname.lastname@example.org )
Organization:Design Analytx Int'l.
Date posted: Wed Jul 26 17:04:27 US/Eastern 2000
Subject: Availability Calculations
Problem: In modeling for Operational Availability (Ao) in a single redundant system, when a failure occurs the redundant spare switches in after fifteen seconds. I want to model for the probability of a second failure while the first is being switched/active maintenance begins. The latter begins after the system is restored by the redundant spare. What happens to my availability during the period of active repair? It is my contention that the Availability equation should be replaced by System Reliability equation once the failed unit is replaced by the redundant spare, thereby removing any further redundancy for any future event until a working spare is put in place. Where should I go to research further. I have most texts and they don't treat this subject in enough detail to satisfy my need for in-depth details.