By Dev G. Raheja, Louis J. Gullo
ISBN-10: 0470486759
ISBN-13: 9780470486757
A certain, design-based method of reliability engineering
Design for Reliability presents engineers and executives with quite a number instruments and strategies for incorporating reliability into the layout method for complicated platforms. It in actual fact explains tips on how to layout for 0 failure of serious process features, resulting in huge, immense mark downs in product life-cycle bills and a dramatic development within the skill to compete in international markets.
Readers will discover a wealth of layout practices no longer coated in ordinary engineering books, letting them imagine open air the field while constructing reliability standards. they're going to learn how to deal with excessive failure premiums linked to structures that aren't safely designed for reliability, fending off pricey and time-consuming engineering adjustments, equivalent to over the top checking out, maintenance, upkeep, inspection, and logistics.
Special gains of this publication include:
- A unified technique that integrates principles from laptop technological know-how and reliability engineering
- Techniques acceptable to reliability in addition to safeguard, maintainability, approach integration, and logistic engineering
- Chapters on layout for severe environments, constructing trustworthy software program, layout for trustworthiness, and HALT impact on design
Design for Reliability is a must have advisor for engineers and bosses in R&D, product improvement, reliability engineering, product security, and caliber insurance, in addition to a person who must bring excessive product functionality at a lower price whereas minimizing method failure
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Additional info for Design for Reliability
Sample text
In the general case, the segment or system reliability formula is m−1 Rsegment = Rm-out-of-n = 1 − i =0 n! (n − i )! (2) 22 Chapter 2 Reliability Design Tools System failure or specific failure mode OR Block A Block B AND Block C Block D Series reliability Parallel reliability (The failure of either block causes results in failure) (Both blocks must fail for product to fail) Figure 5 AND Block C Block D Block m “m” needing “n” reliability (More than (m-n) blocks must fail for product to fail) Fault tree.
Life tests are performed by applying a stress or stresses to a component and tracking the time to failure of a portion or all of a sample set. If sufficient samples are tested to failure, the failure time versus failure quantity can be analyzed statistically to develop a failure probability distribution function (PDF), a statistical model of the probability of failure versus time. If the life tests are repeated at multiple stress levels, a different type of model, a stress model , can be developed that aligns the time to failure for a specific percentage of failures (a percentile) versus stress.
Sometimes, the design must change to accommodate a manufacturing issue that improves quality or cost issues later in the product life cycle. 28 Chapter 2 Reliability Design Tools Continued Use of Tools It is important to note that the tools covered in the “early program” are still useful in later stages. Their validity and accuracy can often be improved greatly once the design details become more developed. It is in the interest of the program to gain visibility into the reliability issues as the design develops so that changes can be known and addressed.
Design for Reliability by Dev G. Raheja, Louis J. Gullo
by Daniel
4.5