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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

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Chapter 4 Supplement

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  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

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