Examinando por Autor "Ruiz-Arenas, S."
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Ítem DUAL-ASPECT MODEL FOR FAILURE FORECASTING IN CYBER-PHYSICAL SYSTEMS(2014-05-23) Ruiz-Arenas, S.; Horváth, Imre; Opiyo, Eliab Z.; Mejá-Gutiérrez, R.; Ruiz-Arenas, S.; Horváth, Imre; Opiyo, Eliab Z.; Mejá-Gutiérrez, R.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)Cyber physical systems (CPSs) are complex systems whose performance depends on the interactions between heterogeneous subsystems, the external environment, and the interrelation between the natural systemsÍtem Implementation of system operation modes for health management and failure prognosis in cyber-physical systems(MDPI AG, 2020-01-01) Ruiz-Arenas, S.; Rusák, Z.; Mejía-Gutierrez, R.; Horváth, I.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)Cyber-physical systems (CPSs) have sophisticated control mechanisms that help achieve optimal system operations and services. These mechanisms, imply considering multiple signal inputs in parallel, to timely respond to varying working conditions. Despite the advantages that control mechanisms convey, they bring new challenges in terms of failure prevention. The compensatory action the control exerts cause a fault masking effect, hampering fault diagnosis. Likewise, the multiple information inputs CPSs have to process can affect the timely system response to faults. This article proposes a failure prognosis method, which combines time series-based forecasting methods with statistically based classification techniques in order to investigate system degradation and failure forming on system levels. This method utilizes a new approach based on the concept of the system operation mode (SOM) that offers a novel perspective for health management that allows monitoring the system behavior, through the frequency and duration of SOMs. Validation of this method was conducted by systematically injecting faults in a cyber-physical greenhouse testbed. The obtained results demonstrate that the degradation and fault forming process can be monitored by analyzing the changes of the frequency and duration of SOMs. These indicators made possible to estimate the time to failure caused by various failures in the conducted experiments. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.Ítem Integration of DFMA throughout an academic product design and development process supported by a PLM strategy(2011-01-01) Osorio-Gomez, G.; Ruiz-Arenas, S.Quantitative Design for Manufacture and Assembly (DFMA) approaches are often applied during the last stages of the Product Design and Development Process (PDDP) as a unique activity, but it would be integrated more efficiently working from the first stages throughout the whole process according to the Concurrent Engineering philosophy. It is proposed a holistic PDDP where the activities and tools of DFMA Methodologies are integrated through its different stages in a single and distributed way, in order to obtain an integral implementation of DFMA in a "Product Lifecycle Management -PLM" strategy further along. This attempt is oriented to the implementation of a holistic PLM strategy in a standardized academic PDDP in the B.Eng. in Product Design Engineering at EAFIT University- Colombia. Besides, it is an initial proposal to integrate DFX methodologies in PLM, seeing that previous experiences have demonstrated that, at academic level, in projects where the application of all taught courses should be evident in the final designed products, students forget to apply considerations related to manufacturing and assembly issues. Copyright © 2002-2012 The Design Society. All rights reserved.Ítem A multi-agent approach for engineering design knowledge modelling(SPRINGER, 2011-01-01) Mejía-Gutiérrez, R.; Cálad-Álvarez, A.; Ruiz-Arenas, S.Usually a product design process implies collaborative work between experts located in different geographical locations. This context makes the process of taking design decisions more difficult and slow. Nowadays, definition of variables and constraints is a key issue, that experts related with product design have to face throughout the product lifecycle. A Multi-Agent system is proposed for tutoring experts in a standardized manner for the definition of variables and constraints. This domain specific knowledge will be use to build "Constraint Satisfaction Problem" models to support early stages of product design, specifically embodiment design. © 2011 Springer-Verlag.Ítem Towards the maintenance principles of cyber-physical systems(ASSOC MECHANICAL ENGINEERS TECHNICIANS SLOVENIA, 2014-01-01) Ruiz-Arenas, S.; Horváth, I.; Mejía-Gutiérrez, R.; Opiyo, E.Z.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)Cyber-physical systems (CPSs) are rapidly proliferating in different applications. Their system features significantly differ from those of linear complex systems (LCSs). Consequently, they pose novel challenges with regard to ensuring the dependability of system operation. Maintenance of CPSs raises new theoretical and practical issues. To guarantee a high level of dependability, new and efficient system maintenance principles should be explored and operationalized in various contexts. This paper reports on the first results of the authors' work in this direction. A comprehensive literature review has been conducted with the objective of identifying the specific features of LCSs and CPSs. We analysed the major maintenance principles and approaches currently applied to complex systems to see how they can be applied to CPSs. We found that the existing maintenance principles have various relationships with CPSs: (i) some of them cannot be considered in the context of CPSs due to incongruent system features, (ii) some of them can be adapted due to certain partial congruencies, and (iii) some of them can be applied directly due to the congruency of some system features of LCSs with CPSs. It was also found and demonstrated through a number of practical examples that many specific maintenance principles need to be developed for CPSs. We assert that the system features of CPSs without parallel in LCSs primarily reveal what sort of new maintenance principles and approaches are needed. The ultimate goal of our on-going research is to define and test these new maintenance principles. In this paper, we identify and define these principles, starting from the unique system features of CPSs and aiming to develop a maintenance advisory system. © 2014 Journal of Mechanical Engineering. All rights reserved.