SRC Forum - Message Replies
Forum: Reliability & Maintainability Questions and Answers
Topic: Reliability & Maintainability Questions and Answers
Topic Posted by: Reliability & Maintainability Forum
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Posted by: JM Cloarec
Date posted: Tue Oct 28 22:57:59 US/Eastern 2003
Subject: MTBF assignment
Can we estimate a MTBF target like that :
reliability performance system is any failure should occur less than once per year. As the system is used 18h per day, the MTBF must be equal or greater to 6,570 h i.e (8,760 / 24) * 18.
Subject: MTBF Test Time
Reply Posted by: BWD
Date Posted: Tue Nov 4 11:25:42 US/Eastern 2003
Given that the reliability time factor for performance is one year or 8760 hours, operating and non-operating time must be considered. So, lowering the time factor is not acceptable. My calculation for a 90% confidence level and one or less failure in one year is a mean-time-between- failure (MTBF) of 2,250 hours.