1 / 12

Chapter 4 Supplement Reliability

Chapter 4 Supplement Reliability. Reliability: the probability that a manufactured good, piece of equipment, or system performs its intended function for a stated period of time under specified operating conditions. Several ways to looking at reliability: First view:

tad
Télécharger la présentation

Chapter 4 Supplement Reliability

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 4 SupplementReliability Saba Bahouth – UCO

  2. Reliability:the probability that a manufactured good, piece of equipment, or system performs its intended function for a stated period of time under specified operating conditions. • Several ways to looking at reliability: • First view: • Related to the probability of working properly when needed. • Second view: • Related to the life of the product (How long does it work before it breaks) • Probability of a product serving longer than a specified period of time Saba Bahouth – UCO

  3. RP = 0.98 RL = 0.95 RF = 0.97 Saba Bahouth – UCO

  4. Example of Overhead Projector RP = 0.98 RL = 0.95 RF = 0.97 RbL= 0.96 Rs = 0.94 Saba Bahouth – UCO

  5. Probability of first component working Probability of second component working + x Providing Backups Rss = Rm + {(1-Rm) x Rb} Probability of needing second component Rss = Saba Bahouth – UCO

  6. 100 80 60 40 20 0 n=1 n=10 Reliability of the System (Percent) n=50 n=100 n=300 n=400 n=200 100 99 98 97 96 Average Reliability of all Components (Percent) System Reliability - Components in Series Saba Bahouth – UCO

  7. .80 .70 .90 Basic Rule Lamp 3 (backup for Lamp 2) Lamp 2 (backup for Lamp1) 1 – P(all fail) 1-[(1-.90)*(1-.80)*(1-.70)] = .994 Lamp 1 Saba Bahouth – UCO

  8. Availability The fraction of time a piece of equipment is expected to be available for operation. MTBF = mean time between failures MTR = mean time to repair Saba Bahouth – UCO

  9. Infant mortality Regular failure Wear-out failure Failure rate Lifetime Saba Bahouth – UCO

  10. Improving Reliability • Component design • Production/assembly techniques • Testing • Redundancy/backups • Preventive maintenance procedures • User education • System design Saba Bahouth – UCO

  11. Reliability = e -T/MTBF 1- e -T/MTBF T Time Exponential Distribution Saba Bahouth – UCO

  12. Reliability 0 z Normal Distribution Saba Bahouth – UCO

More Related