1,162,772 research outputs found

    Continuous maintenance and the future – Foundations and technological challenges

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    High value and long life products require continuous maintenance throughout their life cycle to achieve required performance with optimum through-life cost. This paper presents foundations and technologies required to offer the maintenance service. Component and system level degradation science, assessment and modelling along with life cycle ‘big data’ analytics are the two most important knowledge and skill base required for the continuous maintenance. Advanced computing and visualisation technologies will improve efficiency of the maintenance and reduce through-life cost of the product. Future of continuous maintenance within the Industry 4.0 context also identifies the role of IoT, standards and cyber security

    Integrating case-based reasoning and hypermedia documentation: an application for the diagnosis of a welding robot at Odense steel shipyard

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    Reliable and effective maintenance support is a vital consideration for the management within today's manufacturing environment. This paper discusses the development of a maintenance system for the world's largest robot welding facility. The development system combines a case-based reasoning approach for diagnosis with context information, as electronic on-line manuals, linked using open hypermedia technology. The work discussed in this paper delivers not only a maintenance system for the robot stations under consideration, but also a design framework for developing maintenance systems for other similar applications

    Invertible Program Restructurings for Continuing Modular Maintenance

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    When one chooses a main axis of structural decompostion for a software, such as function- or data-oriented decompositions, the other axes become secondary, which can be harmful when one of these secondary axes becomes of main importance. This is called the tyranny of the dominant decomposition. In the context of modular extension, this problem is known as the Expression Problem and has found many solutions, but few solutions have been proposed in a larger context of modular maintenance. We solve the tyranny of the dominant decomposition in maintenance with invertible program transformations. We illustrate this on the typical Expression Problem example. We also report our experiments with Java and Haskell programs and discuss the open problems with our approach.Comment: 6 pages, Early Research Achievements Track; 16th European Conference on Software Maintenance and Reengineering (CSMR 2012), Szeged : Hungary (2012

    A framework for effective management of condition based maintenance programs in the context of industrial development of E-Maintenance strategies

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    CBM (Condition Based Maintenance) solutions are increasingly present in industrial systems due to two main circumstances: rapid evolution, without precedents, in the capture and analysis of data and significant cost reduction of supporting technologies. CBM programs in industrial systems can become extremely complex, especially when considering the effective introduction of new capabilities provided by PHM (Prognostics and Health Management) and E-maintenance disciplines. In this scenario, any CBM solution involves the management of numerous technical aspects, that the maintenance manager needs to understand, in order to be implemented properly and effectively, according to the company’s strategy. This paper provides a comprehensive representation of the key components of a generic CBM solution, this is presented using a framework or supporting structure for an effective management of the CBM programs. The concept “symptom of failure”, its corresponding analysis techniques (introduced by ISO 13379-1 and linked with RCM/FMEA analysis), and other international standard for CBM open-software application development (for instance, ISO 13374 and OSA-CBM), are used in the paper for the development of the framework. An original template has been developed, adopting the formal structure of RCM analysis templates, to integrate the information of the PHM techniques used to capture the failure mode behaviour and to manage maintenance. Finally, a case study describes the framework using the referred template.Gobierno de Andalucía P11-TEP-7303 M

    Supporting group maintenance through prognostics-enhanced dynamic dependability prediction

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    Condition-based maintenance strategies adapt maintenance planning through the integration of online condition monitoring of assets. The accuracy and cost-effectiveness of these strategies can be improved by integrating prognostics predictions and grouping maintenance actions respectively. In complex industrial systems, however, effective condition-based maintenance is intricate. Such systems are comprised of repairable assets which can fail in different ways, with various effects, and typically governed by dynamics which include time-dependent and conditional events. In this context, system reliability prediction is complex and effective maintenance planning is virtually impossible prior to system deployment and hard even in the case of condition-based maintenance. Addressing these issues, this paper presents an online system maintenance method that takes into account the system dynamics. The method employs an online predictive diagnosis algorithm to distinguish between critical and non-critical assets. A prognostics-updated method for predicting the system health is then employed to yield well-informed, more accurate, condition-based suggestions for the maintenance of critical assets and for the group-based reactive repair of non-critical assets. The cost-effectiveness of the approach is discussed in a case study from the power industry

    Integrated reliability centred maintenance approach in public sector facilities management.

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    Reliability Centred Maintenance (RCM) is focused on ensuring an asset continues to provide its designed function in its present operating context. Through a number of stages, RCM allows for thorough and constant monitoring of assets to maintain their level of performance, expand life cycle and improve efficiency. A conceptual holistic framework was developed embedding RCM approach and assessing the impact of maintenance strategies in four dimensions: business, functional, legal and context requirements to ensure optimum level of maintenance. A prototype spread-sheet model was developed encapsulating the concept and the model was evaluated using a case study. The preliminary evaluation has shown the potential of the model to realise benefits and improve reliability of the services of the assets to the clients/users. Further research and development is essential in order to calibrate model parameters to specific company requirements as well as to develop a database of assets with failure patterns and monitoring methods

    Context-Sensitive Binding: Flexible Programming Using Transparent Context Maintenance

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    Context-aware computing is a new paradigm whose emergence has been fostered by a growing reliance on light and mobile computing devices, which adapt their behavior to changing environmental conditions. The dynamic nature of the environment is a direct result of the mobility of people and devices. Because the development of applications that entail a significant level of dynamic adaptation is a difficult and error-prone task, new design methods and constructs are needed. Precise and flexible specification of the resources needed to operate in specific contexts combined with transparent context management can simplify the development process. In this paper we propose a particular embodiment of this general design strategy in the form of a novel programming construct called context-sensitive binding. The approach allows programmers to define and use in their programs objects whose behavior is supported by code discovered at runtime within the computing environment surrounding the de-vice. The binding between the object in the program and the support object that delivers its realization is maintained transparently and is altered as the environment changes, thus making the binding context sensitive. The criteria for choosing among viable support objects are prescribed at the time the object is first instantiated. The paper introduces the concept of context sensitive binding, describes a Java-based implementation, and explores the programming implications of the proposed construct
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