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Read e-book online Advanced Reliability Models and Maintenance Policies PDF

By Toshio Nakagawa

ISBN-10: 1848002939

ISBN-13: 9781848002937

Reliability concept is an enormous obstacle for engineers and executives engaged in making prime quality items and designing hugely trustworthy structures. Advanced Reliability versions and upkeep Policies is a survey of recent examine subject matters in reliability concept and optimization concepts in reliability engineering.

Advanced Reliability types and upkeep Policies introduces partition and redundant difficulties inside of reliability versions, and gives optimization options. The e-book additionally exhibits tips on how to practice upkeep in a finite time span and at failure detection, and to use restoration recommendations for computers. New topics akin to reliability complexity and repair reliability in reliability thought are theoretically proposed, and optimization difficulties in administration technological know-how utilizing reliability ideas are presented.

Advanced Reliability types and upkeep Policies is a necessary consultant for graduate scholars and researchers in reliability idea, and a precious reference for reliability engineers engaged either in upkeep paintings and in administration and computing device systems.

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Extra resources for Advanced Reliability Models and Maintenance Policies

Example text

1) 0 We find an optimum number N ∗ that minimizes C(N ). It is clearly seen that limN →∞ C(N ) = ∞ and ∫ S C(1) = cI + cD F (t) dt. 2) 0 Thus, there exists a finite number N ∗ (1 ≤ N ∗ < ∞) that minimizes C(N ). , F (t) = 1 − e−λt . 1) is rewritten as ( ) cD S 1 − e−λS cD C(N ) = cI + − (1 − e−λS ) (N = 1, 2, . . ). 3) N λ 1 − e−λS/N Forming the inequality C(N + 1) − C(N ) ≥ 0, [1 − e−λS/(N +1) − e−λS/N cD S ≥ cI − [1 − e−λS/N ]/(N + 1) e−λS/(N +1) ]/N (N = 1, 2, . . ). 4) becomes simply N ∑ j=1 j= N (N + 1) λS cD S ≥ .

More detailed studies on system complexity will be done in Chap. 9. 5. We can obtain the optimum number n∗ that maximizes Rs (n, n). The reliability of a series-parallel system increases with n for large q, however, the reliability of the complexity decreases with n. 5 presents the optimum n∗ for α = 10−1 –10−8 and q = 1 − 10−1 , 1 − 10−2 , and 1 − 10−3 . This indicates naturally that n∗ decreases with both α and q. 3 Three Redundant Systems As one application of redundant techniques, this section considers the following three typical redundant systems and evaluates them to make the optimization design of system redundancies: (1) System 1: One unit system with n-fold mean time.

We can obtain the optimum number n∗ that maximizes Rs (n, n). The reliability of a series-parallel system increases with n for large q, however, the reliability of the complexity decreases with n. 5 presents the optimum n∗ for α = 10−1 –10−8 and q = 1 − 10−1 , 1 − 10−2 , and 1 − 10−3 . This indicates naturally that n∗ decreases with both α and q. 3 Three Redundant Systems As one application of redundant techniques, this section considers the following three typical redundant systems and evaluates them to make the optimization design of system redundancies: (1) System 1: One unit system with n-fold mean time.

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Advanced Reliability Models and Maintenance Policies by Toshio Nakagawa


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