On the role of Prognostics and Health Management in advanced maintenance systems

The advanced use of the Information and Communication Technologies is evolving the way that systems are managed and maintained. A great number of techniques and methods have emerged in the light of these advances allowing to have an accurate and knowledge about the systems’ condition evolution and remaining useful life. The advances are recognized as outcomes of an innovative discipline, nowadays discussed under the term of Prognostics and Health Management (PHM). In order to analyze how maintenance will change by using PHM, a conceptual model is proposed built upon three views. The model highlights: (i) how PHM may impact the definition of maintenance policies; (ii) how PHM fits within the Condition Based Maintenance (CBM) and (iii) how PHM can be integrated into Reliability Centered Maintenance (RCM) programs. The conceptual model is the research finding of this review note and helps to discuss the role of PHM in advanced maintenance systems.EU Framework Programme Horizon 2020, 645733 - Sustain-Owner - H2020-MSCA-RISE-201

La exploración con espejos y la enseñanza de la geometría en la educación secundaria obligatoria: sobre competencias de los alumnos y sus procesos cognitivos (estudio exploratorio)

Este trabajo presenta un estudio exploratorio sobre la enseñanza/aprendizaje de los procesos matemáticos de describir, clasificar, definir y demostrar utilizando como contexto la exploración con espejos. El estudio toma como ámbito de estudio estudiantes de 2º y 3º de la enseñanza secundaria obligatoria de la Comunitat Valenciana y como marco de referencia investigaciones llevadas a cabo en el Departamento de Didáctica de las Matemáticas de la Universitat de València y en el Instituto de Freudenthal. Se determina la actividad matemática que se puede desarrollar a partir de la exploración con espejos; realizamos un análisis teórico de investigaciones sobre las problemáticas planteadas; elaboramos un Modelo de enseñanza para la experimentación y para el examen de los datos obtenidos se interroga la actuación de los alumnos centrando la atención en las competencias que desarrollan y en sus procesos cognitivos

Exploración con espejos y enseñanza/aprendizaje de la geometría en la educación secundaria obligatoria: sobre la actuación de la profesora y la transferencia de procedimientos

Este trabajo es parte de un estudio exploratorio sobre la enseñanza/aprendizaje de contenidos curriculares de la Enseñanza Secundaria Obligatoria de la Comunidad Valenciana que surgen al utilizar la exploración con espejos como contexto. Tiene como objetivo recoger información para reelaborar los componentes del Modelo Teórico Local elaborado previamente para servir de referente en esta investigación. Hemos diseñado un Modelo de Enseñanza que hemos desarrollado en la ESO en contexto laboratorio. Las observaciones las hemos distribuido en tres grupos: 1) las competencias de los alumnos y sus procesos cognitivos, 2) los efectos de la actuación de la profesora y 3) la transferencia que los alumnos hacen de los procedimientos. Aquí nos centramos en el Modelo de Enseñanza y en las observaciones de los grupos 2 y 3

Urban sound quality: influence of audio-visual interactions on sound environment assessment

17 págs, 3 figuras.[EN] Some studies have proved that the perception of the environment is intersensorial. However, the studies focused on the evaluation of sound environment have been conducted without taking into account the influence of other sensorial information perceived in the environment. With the aim of analysing the incidence of the audio-visual interactions in the soundscape and how they affect the global assessment of the urban contexts, an experimental study was carried out on a sample of 313 subjects. The visual and auditory stimuli representing several urban environments were presented individually and combined. Their evaluation was made in a 7 point-scale of pleasantness. The results show that visual settings influence on the assessment of natural, technological and social sound environments. This interaction is significant and complex, depending on the pleasantness given to both visual and auditory stimuli. Results also emphasize that the global evaluation of urban environments depends on the audio-visual interactions.[ES] Diferentes estudios han comprobado que la percepción del medio es intersensorial. Sin embargo, los trabajos que analizan la respuesta de la población ante el ambiente sonoro no suelen contemplar la influencia de otras informaciones sensoriales del entorno en dicha respuesta. Con objeto de conocer la incidencia de las interacciones audiovisuales en la valoración del paisaje sonoro, así como en la evaluación global del ambiente urbano, se llevó a cabo un estudio experimental en el que participaron 313 sujetos. Los estímulos visuales y auditivos fueron presentados individualmente y combinados. Su evaluación se realizó en términos de agrado en una escala de 7 puntos. Los resultados muestran una incidencia de la imagen en la valoración de los diversos ambientes sonoros evaluados, tanto naturales como sociales y tecnológicos. Esta relación es significativa y compleja, dependiendo principalmente del nivel de agrado sentido en relación a ambos estímulos. Asimismo, se constató que la valoración global del ambiente depende de la interacción entre ambas informaciones, visuales y auditivas.Peer reviewe

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

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

Numerical solution for an inverse variational problem

Research partially supported by Junta de Andalucía Grant FQM359. Funding for open access charge: Universidad de Granada /CBUA.Funding Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature.In the present work, firstly, we use a minimax equality to prove the existence of a solution to a certain system of varitional equations providing a numerical approximation of such a solution. Then, we propose a numerical method to solve a collage-type inverse problem associated with the corresponding system, and illustrate the behaviour of the method with a numerical example.CRUE-CSIC agreementSpringer Natur

Conservación del águila imperial ibérica -futuro incierto-

Treball presentat a l'assignatura de Deontologia i Veterinària Legal (21223

Review and Comparison of Intelligent Optimization Modelling Techniques for Energy Forecasting and Condition-Based Maintenance in PV Plants

Within the field of soft computing, intelligent optimization modelling techniques include various major techniques in artificial intelligence. These techniques pretend to generate new business knowledge transforming sets of "raw data" into business value. One of the principal applications of these techniques is related to the design of predictive analytics for the improvement of advanced CBM (condition-based maintenance) strategies and energy production forecasting. These advanced techniques can be used to transform control system data, operational data and maintenance event data to failure diagnostic and prognostic knowledge and, ultimately, to derive expected energy generation. One of the systems where these techniques can be applied with massive potential impact are the legacy monitoring systems existing in solar PV energy generation plants. These systems produce a great amount of data over time, while at the same time they demand an important e ort in order to increase their performance through the use of more accurate predictive analytics to reduce production losses having a direct impact on ROI. How to choose the most suitable techniques to apply is one of the problems to address. This paper presents a review and a comparative analysis of six intelligent optimization modelling techniques, which have been applied on a PV plant case study, using the energy production forecast as the decision variable. The methodology proposed not only pretends to elicit the most accurate solution but also validates the results, in comparison with the di erent outputs for the di erent techniques