Browsing by Author "Mehen, Jorn"

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    ‘In-situ’Inspection Technologies: Trends in Degradation Assessment and Associated Technologies
    (Elsevier, 2017-03-02) Addepalli, Sri; Roy, Rajkumar; Axinte, D.; Mehen, Jorn
    The advent of advanced, innovative and complex engineered systems has established new technologies that are far more superior and perform well even in harsh environments. It is well established that such next generation systems need to be maintained regularly to prevent any catastrophic failure as a result of regular wear and tear. Non-destructive and structural monitoring technologies have been supporting maintenance activities for over a century and industries still continue to rely on such technologies for effective degradation assessment. Maintenance ‘in-situ’ has been adopted for decades where the health of system or component needs to be inspected in its natural environment, especially those safety critical systems that need in-field inspection to determine its health. This paper presents selective case studies adopted in the area of damage assessment that qualify for both field and ‘in-situ’ inspection. The future directions in the applicability of traditional and advanced inspection techniques to inspect multiple materials and in the area of inaccessible area degradation assessment have also been presented as part of this study.
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    Maintenance Informatics Dashboard Design for Through-life Engineering Services
    (Elsevier, 2017-03-02) Okoh, Caxton; Roy, Rajkumar; Mehen, Jorn
    This article introduces maintenance informatics dashboard design approach for visualising maintenance, repair and overhaul events on a timeline. This paper presents a proposed methodology for aggregate visualisation techniques and a 2D graphical plot method as well as a summary of events on a timeline. In this paper, these events are occurrences which are classified and categorised into levels. The occurrences are accumulated over time as historical information and represented in a visual format over a timeline based on an entity relationship diagram. The information modelling technique with respect to data visualisation is emphasised. The result is a single-page-view of maintenance activities. The maintenance activities of aircraft engines are visualised to ease the accessibility of getting accurate and relevant information for making better maintenance decision. The result can be used to gain insight of the root cause of the events from inception to end of life of the engine.
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    Secure IoT Devices for the Maintenance of Machine Tools
    (Elsevier, 2017-03-02) Tedeschi, Stefano; Mehen, Jorn; Tapoglou, N.; Roy, Rajkumar
    Through the Internet of Things (IoT) interaction between objects becomes possible in a way we have never seen before. With the advent of IoT and its introduction into almost all aspects of life, safety and security of IoT devices has to be considered for their whole life cycle. This concerns not only the large amounts of data that needs to be exchanged securely but also the design of the hardware of the devices themselves. Security has to be designed right from the start into IoT devices rather than added on later. This paper will introduce a global strategy for secure Design for IoT which includes: • Safe solutions for environments with rich information • Guarantee that the devices are functioning as intended by the manufacturer and are not damaged • Life cycle security across devices, networks and data centers • Support for industry standards and interoperability of devices • Ability to solve the challenges of the information link • Secure Clouds for traditional systems. This paper lays the foundation for the creation of a safe remote monitoring system for machine tools through IoT devices and analyses the critical issues focusing on the manufacturing environment.
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    A Simulation Based Approach to Model Design Influence on the Fatigue Life of a Vented Brake Disc
    (Elsevier, 2017-03-02) Kakandar, Ebiakpo; Roy, Rajkumar; Mehen, Jorn
    The brake disc is considered a safety critical components in vehicles, hence the growing concern on its service life performance. Brake disc performance is measured by several criteria of which prominent amongst these criteria is fatigue life and disc thermal deflection. This study considers the influence of geometric design features of a vented brake disc on its fatigue life at particular sections of the brake disc which are considered critical and its deflection due to thermal inputs. A parametric study is carried out with CAE/FEA using Taguchi design of experiment. The study identified the geometric design features that significantly influence the studied performance measures. Sensitivity plots were also obtained to show the manner these design factors affect the fatigue life at these points as well as the disc thermal deflection. Two design features, the inboard plate thickness and the length of the effective offset are observed to contribute majorly to the fatigue life of the brake disc as well as its thermal deflection. Hence, design effort should be concentrated on these features for optimal fatigue life design at these points of interest in this study.