Maintenance and replacement policies under technological obsolescence

Clavareau, Julien; Labeau, Pierre-Etienne

doi:10.1016/j.ress.2008.03.033

Cited by 29 publications

(25 citation statements)

References 8 publications

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“…The description of the units is based on previous works on technological obsolescence [5][6][7][8]. Complete description of the reliability model of a single production unit can be found in [8] and is recalled here below.…”

Section: Unit Modelmentioning

confidence: 99%

“…Complete description of the reliability model of a single production unit can be found in [8] and is recalled here below.…”

Section: Unit Modelmentioning

confidence: 99%

“…This K strategy, adapted to the case of non-negligible intervention times [6][7][8], is introduced as follows: first, new-type units are used only to replace one by one the old-type units, once their effective working time exceeds a given threshold or if they have to be correctively replaced; then, after the Kth individual replacement, a grouped preventive replacement of the remaining n-K old-type units of the current generation by new-type ones is immediately scheduled. The 0 strategy corresponds to the preventive replacement of all old-type units at the initial moment the new-generation units become available.…”

Section: Replacement Policiesmentioning

confidence: 99%

“…When the decision is taken to start the transition to the next-generation units, the manager has also to decide what to do with the remaining old-type units in stock. In [6,8] a solution inspired by the K strategy was proposed. A number J of the stored old-type spares are used to first perform replacements within the same technological generation, before starting the replacements by next-generation equipment.…”

Section: Replacement Policiesmentioning

confidence: 99%

“…Works [4][5][6][7][8] attempt to treat this replacement problem under obsolescence for a set of identical items when one new type of equipment is available. These works try to answer, among others, the following questions: How to schedule the replacement of the old-type units by the new-type ones?…”

Section: Introductionmentioning

confidence: 99%

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A Petri net-based modelling of replacement strategies under technological obsolescence

Clavareau

Labeau

2009

Reliability Engineering & System Safety

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a b s t r a c tThe technological obsolescence of a unit is characterised by the existence of challenger units displaying identical functionalities, but with higher performances. Though this issue is commonly encountered in practice, it has received little consideration in the literature. Previous exploratory works have treated the problem of replacing old-technology items by new ones, for identical components facing a unique new generation of items. This paper aims to define, in a realistic way, possible replacement policies when several types of challenger units are available and when the performances of these newly available units improve with time.Since no fully generic model can exist in maintenance optimisation, a modular modelling of the problem, allowing easy adaptations to features corresponding to specific applications is highly desirable. This work therefore proposes a modular Petri net model for this problem, underlying a Monte Carlo (MC) estimation of the costs incurred by the different possible replacement strategies under consideration.

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Section: Unit Modelmentioning

confidence: 99%

“…Complete description of the reliability model of a single production unit can be found in [8] and is recalled here below.…”

Section: Unit Modelmentioning

confidence: 99%

Section: Replacement Policiesmentioning

confidence: 99%

Section: Replacement Policiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Petri net-based modelling of replacement strategies under technological obsolescence

Clavareau

Labeau

2009

Reliability Engineering & System Safety

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Optimal replacement policy for obsolete components with general failure rates

Mercier

2008

Appl Stoch Models Bus & Ind

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Identical components are considered, which become obsolete once new-type ones are available, more reliable and less energy consuming. We envision different possible replacement strategies for the old-type components by the new-type ones: either purely preventive, where all old-type components are replaced as soon as the new-type ones are available; either purely corrective, where the old-type ones are replaced by new-type ones only at failure; or a mixture of both strategies, where the old-type ones are first replaced at failure by new-type ones and next simultaneously preventively replaced after a fixed number of failed old-type components.To evaluate the respective value of each possible strategy, a cost function is considered, which represents the mean total cost on some finite time interval [0, t]. This function takes into account replacement costs, with economical dependence between simultaneous replacements, and also some energy consumption (and/or production) cost, with a constant rate per unit time.A full analytical expression is provided for the cost function induced by each possible replacement strategy. The optimal strategy is derived in long-time run. Numerical experiments conclude the paper. fixed time, say time 0, some new components appear in the market, issued from a new technology, which makes them more reliable, less energy consuming and more performing. Such new-type of components may be substituted to the older ones with no problem of compatibility. There is no stocking of old-type components and after time 0, no old-type component is available anymore (or the industrialist is not allowed to use old-type components anymore, e.g. for safety reasons). After time 0, any failed component, either old-type or new-type, is then instantaneously replaced by a new-type one. At time 0, each old-type component is in use since some random time, with some random remaining lifetime. If the new-type components are much less energy consuming than the older ones and if the period of interest is very long, it may then be expedient to remove all old-type components immediately at time 0 and replace them by new-type ones, leading to some so-called purely preventive replacement strategies. On the contrary, in case there is no much improvement between both technologies and if the period of interest is short, it may be better to wait until the successive failures of the old-type components and replace them by new-type ones only at failure, leading to some purely corrective replacement strategy. More generally, some mixture of both strategies, preventive and corrective, may also be envisioned and may lead to lower costs, as can be seen later. The point of the present paper is to look for the optimal replacement strategy among the purely preventive one, the purely corrective one and the mixtures of both strategies envisioned here. To evaluate the respective value of each possible strategy, a cost function is considered, which represents the mean total cost on some finite time interval [0, t]. This function takes into a...

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Preventive Maintenance Models: A Review

2011

Replacement Models With Minimal Repair

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Maintenance and replacement policies under technological obsolescence

Cited by 29 publications

References 8 publications

A Petri net-based modelling of replacement strategies under technological obsolescence

A Petri net-based modelling of replacement strategies under technological obsolescence

Optimal replacement policy for obsolete components with general failure rates

Preventive Maintenance Models: A Review

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