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Condition-based maintenance optimization for continuously monitored degrading systems under imperfect maintenance actions

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Journal of Systems Engineering and Electronics 2020年第4期31卷 841-851页

作者： CHEN Chuang LU Ningyun JIANG Bin XING Yin College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China Jiangsu Key Laboratory of Internet of Things and Control Technologies Nanjing University of Aeronautics and AstronauticsNanjing 211106China School of Earth Sciences and Engineering Hohai UniversityNanjing 211100China

Condition-based maintenance(CBM) is receiving increasing attention in various engineering systems because of its effectiveness. This paper formulates a new CBM optimization problem for continuously monitored degrading systems considering imperfect maintenance actions. In terms of maintenance actions,in practice, they scarcely restore the system to an as-good-as new state due to residual damage. According to up-to-data researches, imperfect maintenance actions are likely to speed up the degradation process. Regarding the developed CBM optimization strategy, it can balance the maintenance cost and the availability by the searching the optimal preventive maintenance threshold.The maximum number of maintenance is also considered, which is regarded as an availability constraint in the CBM optimization problem. A numerical example is introduced, and experimental results can demonstrate the novelty, feasibility and flexibility of the proposed CBM optimization strategy.

关键词： condition-based maintenance(CBM) imperfect maintenance maintenance cost availability constraint optimization

Reliability-Based Full-Life Cycle Optimum Design of Offshore Jacket Platform

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海洋工程：英文版 2004年第1期18卷 47-58页

作者：王立成宋玉普 State Key Laboratory of Coastal and Offshore Engineering

Based on the consideration of operation environment and structural property, an optimum design model of offshore jacket platform is developed in this paper, namely, the reliability-based full-life cycle optimum design model. In this model, the time-dependent reliability assessment method for structural members is established by combination of the decrease of sectional size and performance deterioration of material. The initial investment, maintenance cost and failure loss cost are assembled into the model. The total cost of the platform structure system in its full service period is chosen as the objective function, and the initial reliabilities of the layer elements partitioned in advance are taken as the design variables. Different models are obtained, depending on whether the system reliability constraint is considered or not. This optimum design model can result in the lowest full-life cost and the optimal initial layer reliability of an offshore jacket platform in the design of marine structures. The feasibility of this model is illustrated with an actual jacket platform in the Liaodong Gulf as an example.

关键词： offshore jacket platform full-life cycle optimum design model maintenance cost failure loss cost reliability

Strategy-Based Forecasting Model for Civil Airlines

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Journal of Southwest Jiaotong University(English Edition) 2004年第1期12卷 36-41页

作者：梁剑左洪福 College of Civil Aviation

Airlines usually pay more attention to maintenance cost for efficiency improvement and consumption reduction. However, airlines, especially the domestic airlines, can hardly predict the cost exactly due to the uncertainty and complexity until now. In practice, the cost is calculated by collecting and calculating the invoices afterwards. To settle the problem, a maintenance cost forecasting model is proposed in this paper. maintenance activities are classified into scheduled maintenance and unscheduled maintenance. Scheduled maintenance is periodic, in which the required materials and man-power hours can be obtained properly in advance. Nevertheless, it is impossible to acquire the necessary information of unscheduled maintenance. According to the specific characteristics of each, Activity-Based costing (ABC) and cost Estimating Relationships (CERs) are introduced to attack the building of forecasting models, respectively. Then practical cases, the 3C check of MD-90 and the engine shop visit are adopted to verify the cost forecasting models proposed. The results show that the models not only can predict the actual maintenance cost successfully, but also are helpful to drawing up the maintenance program and managing the maintenance funds efficiently.

关键词： Civil airlines CERs maintenance cost Theory of grey system

A research on the Monte Carlo simulation based on-condition maintenance strategy for wind turbines

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A research on the Monte Carlo simulation based on-condition ...