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Understanding Reliability: Key Concepts and Strategies for System Performance

This chapter focuses on reliability, the essential ability of a product, part, or system to perform its intended function under specified conditions. It defines critical terms such as failure, normal operating conditions, and probability of functionality over time. The text discusses various factors that impact reliability, including component design, assembly techniques, and preventive maintenance. Additionally, it provides mathematical insights into reliability, such as MTBF (Mean Time Between Failures) and MTR (Mean Time to Repair). Strategies for improving reliability through redundancy and user education are also highlighted.

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Understanding Reliability: Key Concepts and Strategies for System Performance

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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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