Optimisation of a single-component maintenance system: a smoothed perturbation analysis approach

Article Abstract:

The method of smoothed perturbation analysis (SPA) may be used to optimize threshold values in a maintenance model. This is done for a model in which a single component is minimally repaired up to an age threshold t and preventively replaced at age tp, where tp > t. With each maintenance action, such as minimal repair, replacement after failure or preventive replacement, costs are related. These costs may depend on the sample path history of the component. An estimator for the derivative of the cost performance with respect to t and tp is presented.

Usage, Mathematical optimization, Optimization theory, Maintenance

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Comments on flow shop and open shop scheduling with a critical machine and two operations per job

Article Abstract:

A polynomial time solution algorithm for a flow-shop scheduling problem is discussed, which appears to be simple. The article contains several comments related to the algorithm, to its complexity, to the proof of optimality and to a possible extension.

Management dynamics, Analysis, Company business management, Closed shop

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Ship scheduling with soft time windows: an optimisation based approach

Article Abstract:

Research the introduction of soft time windows in real ship scheduling problems is presented. It is emphasized that the introduction of soft, rather than hard windows in ship scheduling may lead to reductions in transportation costs.

Ships

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