Advanced Maintenance Modelling for Asset Management by Adolfo Crespo Márquez Vicente González-Prida Díaz & Juan Francisco Gómez Fernández

Author:Adolfo Crespo Márquez, Vicente González-Prida Díaz & Juan Francisco Gómez Fernández
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

(4)

where q is the repair effectiveness (or rejuvenation) parameter and . According to this model, the result of assuming a value of q = 0 leads to a RP (as good as new), while the assumption of q = 1 corresponds to a NHPP (as bad as old). The values of q that fall in the interval 0 < q < 1 represent the after-repair states in which the condition of the element is better than old but worse than new, whereas the cases where q > 1 correspond to a condition worse than old. Similarly, cases with q < 0 would suggest a component or system restored to a state better than new. Therefore, physically speaking, q can be seen as an index for representing the effectiveness and quality of repairs [35]. Even though the q-value of the GRP model constitutes a realistic approach to simulate the quality of maintenance, it is important to point out that the model assumes an identical q for every repair in the item’s life. A constant q may not be the case for some equipment and maintenance processes, but it is a reasonable approach for most repairable components and systems.

The three models described above have advantages and limitations. In general, the more realistic model will be that which is more complex and complete as the mathematical expression involved.

The NHPP model has been proved to provide good results even for realistic situations with better-than-old but worse-than-new repairs [35].

Based on all those mentioned, and given their conservative nature and manageable mathematical expressions, the methodology of the case study that will be presented next concentrates on the NHPP because of its simplicity and for the following reasons [36]:(a)It is generally suitable for the purpose of modeling data with a trend, due to the fact that the accepted formats of the NHPP are monotonously increasing/decreasing functions.

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