chapter  7
16 Pages

Large-Scale Reliability-Redundancy Allocation Optimization Problem Using Three Soft Computing Methods

ByMohamed Arezki Mellal, Edward J. Williams

The industrial world is subject to various risks, whether traditional (technical, economic, or societal risks) or emerging (informational or psychosocial risks). According to the International Standard Organization 31010: 2009-Risk management—Principles and guidelines, the word “risk” is defined as follows: “effect of uncertainty on objectives.” Thus, the definition provided engineers could be modified: “risk is the combination of an event probability and its consequence.” Moreover, a competitive industrial plant should have a high level of system reliability. System reliability belongs to the dependability of the plant. Dependability deals with the industrial risks and is based on several basic concepts whose definitions and interpretations are increasingly refined. These concepts are known by the acronym RAMS+C: reliability, availability, maintainability, safety, and cost, but nowadays supplemented with other concepts, such as durability, testability, resilience,... or combinations of these concepts. Dependability reflects the confidence that can be attributed to a system. The International Electrotechnical Commission 60050 (2002) provides some standard definitions for the elements of dependability.