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In many practical cases, during a system failure or downtime, all non-failed components are kept idle to eliminate further damage to the system. This phenomenon is known as suspended animation (SA) because the aging process of the non-failed components is suspended. Suspended animation introduces dependencies among the component states. Therefore, we cannot calculate the system availability using...
Compared with a binary system model, a multi-state system model provides a more flexible tool for representing engineering systems in real life. In conventional multi-state theory, it is assumed that the exact probability and performance level of each component state are given. However, it may be difficult to obtain sufficient data to estimate the precise values of these probabilities and performance...
Inventory optimization attempts to find the distribution of inventory that best meets specified cost and availability goals. When equipment availability is considered, most reported work treats the impact of preventive maintenance (PM) and corrective maintenance (CM) on the production system as a given cost corresponding to the loss resulting from unmet demand. This paper treats the impact of PM and...
Accurate assessment of system reliability with limited or insufficient statistical data is difficult. This paper presents a method which overcomes the drawbacks of traditional fault tree analysis (FTA) by using FTA based on possibilistic measures and fuzzy logic. This method is designed specifically for situations wherein reliability and safety assessment is imprecise by nature and necessary statistical...
A multi-objective optimization algorithm for solving a mixed-integer programming problem that normally arises in system-reliability design is proposed. Our algorithm uses a genetic algorithm based on Pareto tournament and equivalence sharing, and a population-based constraint handling method. To evaluate the performance of the algorithm, we apply it in a practical reliability optimization problem...
The vibration signal of a gearbox carries the signature of the fault in the gears, and early fault detection of the gearbox is possible by analyzing the vibration signal using different signal processing techniques. Time domain average can extract the periodic waveforms of a noisy vibration signal, whereas wavelet transformation is able to characterize the local features of the signal in different...
Temporised object-oriented Petri nets with changeable structure (TOPNs-CS), which is an extension of OPNs-CS, is capable of modelling one-of-a-kind production (OKP) systems subject to changes. This paper proposes an automatic approach to overcoming the difficulty in building complex TOPNs-CS models for an OKP system. TOPNs of production resources are simplified by the characteristic modelling elements...
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