1 / 11

Chapter 4 Supplement

Chapter 4 Supplement. Reliability. Reliability. Reliability : The ability of a product, part, or system to perform its intended function under a prescribed set of conditions Failure : Situation in which a product, part, or system does not perform as intended

lars-mendoza
Download Presentation

Chapter 4 Supplement

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 Supplement Reliability

  2. Reliability • Reliability: The ability of a product, part, or system to perform its intended function under a prescribed set of conditions • Failure: Situation in which a product, part, or system does not perform as intended • Normal operating conditions: The set of conditions under which an item’s reliability is specified

  3. Reliability is a Probability • Probability that the product or system will: • Function when activated • Function for a given length of time • Independent events • Redundancy

  4. .92 .90 .98 .90 .95 Example S-1: Reliability Determine the reliability of the system shown

  5. .98 .90+.90(1-.90) .95+.92(1-.95) .98 x .99 x .996 = .966 Example S-1 Solution The system can be reduced to a series of three components

  6. Infant mortality Failures due to wear-out Few (random) failures Time, T Failure Rate Figure 4S-1

  7. Reliability = e -T/MTBF 1- e -T/MTBF T Time Exponential Distribution Figure 4S-2

  8. Reliability 0 z Normal Distribution Figure 4S-3

  9. 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

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

More Related