BU385 Chapter Notes - Chapter 4s: Airbag, Liquid Oxygen, Exponential Distribution
Document Summary
Lo1 defining reliability and stating two ways of using it. Reliability: measure of its ability to perform its intended function under a prescribed set of conditions. Used in two ways: when activated, for a given time. Lo2 finding probability of function when activated independent parts; connected in series, success defined as occurrence of all events. P = p(cid:1005) * p(cid:1006) * p(cid:1007) . Three ways to increase reliability: avoid a type of failure; use more durable, quality (more expensive) materials, design simplification; less parts, use redundancy; have backups. 1 (1-p1)(1-p(cid:1006)(cid:895) or p= p(cid:1005) + (cid:894)(cid:1005)-p1)p2 + (1-p(cid:1006)(cid:895)p(cid:1007) . Probability of (cid:1005) working + if (cid:1005) fails, probability of (cid:1006) working . Solve section of parallel as one part of the series. Lo3 finding probability of functioning for a given length of time. Second way of reliability is the time dimension. Failure rate per hour = failures / total operating hours.
