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  • 1.
    Evangelista, Ignacio
    et al.
    Polytechnic Institute of Rosario, ARG.
    Cadierno, Matias
    Polytechnic Institute of Rosario, ARG.
    Farina, Juan
    Polytechnic Institute of Rosario, ARG.
    Roldan, Gabriel
    Polytechnic Institute of Rosario, ARG.
    Pozzo, Maria Isabel
    National Scientific and Technical Research Council, Rosario, ARG.
    Dobboletta, Elsa
    National Scientific and Technical Research Council, Rosario, ARG.
    Garcia-Zubia, Javier
    University of Deusto, ESP.
    Hernandez, Unai
    University of Deusto, ESP.
    Marchisio, Susana
    National University of Rosario, ARG.
    Concari, Sonia
    National University of Rosario,ARG.
    Alves, Gustavo
    Instituto Politécnico do Porto, PRT.
    Nilsson, Kristian
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Active learning of DC circuits: Spreading the use of the VISIR remote lab in Argentina2018In: EDUNINE 2018 - 2nd IEEE World Engineering Education Conference: The Role of Professional Associations in Contemporaneous Engineer Careers, Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2018, p. 216-221Conference paper (Refereed)
    Abstract [en]

    The VISIR+ Project was launched in 2015 with the objective of spreading the use of the VISIR remote laboratory in Latin America, promoting an enquiry-based approach to teaching and learning on electric and electronic circuits. Within the scope of this project, several didactical implementations were achieved both in Argentina and in Brazil. This article describes the latest implementation of VISIR in a pre-university technical school in Argentina (associated partner of the VISIR+ team) in three Physics courses with students having different background knowledge and interests. A set of activities comprising simulations, remote and hands-on experiments were designed in order to engage students in the learning process. The implementation was assessed in terms of the learning objectives and outcomes. Results showed that VISIR is an effective tool to promote active learning. Moreover, this experience seems highly valuable to encourage the dissemination of VISIR in Argentina. © 2018 IEEE.

  • 2.
    Garcia-Loro, Felix
    et al.
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Macho, Alejandro
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Cristobal, Elio San
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Diaz, Gabriel
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Castro, M.
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Kulesza, Wlodek
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Gustavsson, Ingvar
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Nilsson, Kristian
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Fidalgo, André V.
    Polytechnic of Porto, PRT.
    Alves, Gustavo
    Polytechnic of Porto, PRT.
    Marques, Arcelina
    Polytechnic of Porto, PRT.
    Hernandez-Jayo, Unai
    Universidad de Deusto, ESP.
    Garcia-Zubia, Javier
    Universidad de Deusto, ESP.
    Kreiter, Christian
    Fachhochshule Technikum Karnten, AUT.
    Oros, Ramona Georgiana
    Fachhochshule Technikum Karnten, AUT.
    Pester, A.
    Fachhochshule Technikum Karnten, AUT.
    Garbi-Zutin, Danilo
    International Association of Online Engineering (IAOE), AUT.
    Auer, Michael E.
    International Association of Online Engineering (IAOE), AUT.
    Garcia-Hernandez, Carla
    EVM., Tenerife, ESP.
    Tavio, Ricardo
    EVM., Tenerife, ESP.
    Valtonen, Kati
    OMNIA, Helsinki, FIN.
    Lehtikangas, Elina
    OMNIA, Helsinki, FIN.
    Experimenting in PILAR federation: A common path for the future2018In: PROCEEDINGS OF 2018 IEEE GLOBAL ENGINEERING EDUCATION CONFERENCE (EDUCON) - EMERGING TRENDS AND CHALLENGES OF ENGINEERING EDUCATION, IEEE Computer Society , 2018, p. 1518-1523Conference paper (Refereed)
    Abstract [en]

    The PILAR (Platform Integration of Laboratories based on the Architecture of visiR) Erasmus Plus project started in September 2016 and will last three years. The core of the PILAR project is the VISIR remote laboratory-Virtual Instruments System In Reality-. The project aims for a federation of five of the existing VISIR nodes, sharing experiments, capacity and resources among partners, and to provide access to VISIR remote lab, through PILAR consortium, to students from other educational institutions. PILAR will be the framework from which management tasks will be performed and laboratories/experiments will be shared. PILAR will also foster the Special Interest Group of VISIR under the Global Online Laboratory Consortium (GOLC) of the International Association of Online Engineering (IAOE). © 2018 IEEE.

  • 3. Gustavsson, Ingvar
    et al.
    Claesson, Lena
    Nilsson, Kristian
    Zackrisson, Johan
    Zubia, Javier Garcia
    Jayo, Unai Hernandez
    Håkansson, Lars
    Bartunek, Josef Ström
    Lagö, Thomas L
    Claesson, Ingvar
    The VISIR Open Lab Platform2011In: Internet Accessible Remote Laboratories: Scalable E-Learning Tools for Engineering and Science Disciplines / [ed] Azad, Abul K.M.; Auer, Michael E.; Harward, V. Judson, IGI Global , 2011, p. 294-317Chapter in book (Refereed)
    Abstract [en]

    The VISIR Open Lab Platform designed at the Department of Electrical Engineering (AET), the Blekinge Institute of Technology (BTH), Sweden, is a platform for opening instructional laboratories for remote access 24/7 with preserved context. VISIR is an acronym for Virtual Instrument Systems in Reality. In VISIR laboratories, students perform physical experiments and laboratory work remotely. A unique interface gives them the feeling of “being there.” The platform software is published under a GPL license, and other universities, schools, etc., are invited use it to open their laboratories and to participate in further research and development. Apart from BTH, five universities in Europe have set up VISIR online laboratories for electrical experiments and the Indian Institute of Technology Madras in India will set up one soon. A VISIR community has been established. Common projects are initiated, and the sharing of learning material is being discussed. This chapter is a general introduction to VISIR and its possibilities.

  • 4. Gustavsson, Ingvar
    et al.
    Nilsson, Kristian
    , Johan Zackrisson
    A tutorial on the VISIR Open Laboratory Platform and an invitation to join the VISIR Community2009Conference paper (Other academic)
    Abstract [en]

    A local instructional laboratory for electrical experiments can be opened for remote ac-cess using the VISIR Open Laboratory Platform. A VISIR Open Laboratory is a server/client application enabling students to perform physical electrical experiments within limits set by the teacher over the internet using a web browser 24/7. Virtual front panels and a virtual breadboard displayed on the client PCs are used to control the physical equipment connected to the server. The server is an online workbench giving the students the impression that they are working in a real laboratory. Such a workbench supplements a local laboratory equipped with workbenches comprising oscilloscope, function generator, multi-meter, triple power supply, and a solderless breadboard. Apart from Blekinge Institute of Technology in Sweden, where the platform has been created two universities, University of Deusto in Spain and FH Campus Wien in Aus-tria, have already implemented replicas of the online workbench at BTH and use them in their regular education. Other universities are ready to start. It is easy for teachers to introduce their own existing laboratory exercises. A modem connection and a web browser with Flash player are sufficient for the student. The software required to set up such a workbench has been published under a GNU GPL licence. Apart from a standard PC the hardware required to join the VISIR Com-munity and implement an online workbench is a PXI chassis containing instruments and a switching matrix for circuit wiring. The components to be used by the students are to be provided by the teachers and are installed in the matrix. Universities, schools and other teaching organizations are invited to participate and open their local laboratories for remote access in order to be able to produce engineers with a solid and documented laboratory experience but without significantly increased cost per student. This tutorial is divided into four parts: • a general overview of the platform and its performance from the perspectives of the student and the teacher and a presentation of how University of Deusto in Spain uses their VISIR workbench • a mouse-cursor-on session, where the participants are invited to perform ex-periments using their laptops. Only WLAN and Flash Player are required. • course administration • how to provide components for remote users and how to avoid damage of ex-perimental equipment

  • 5. Gustavsson, Ingvar
    et al.
    Nilsson, Kristian
    Lagö, Thomas L
    On physical experiments and individual assessment of laboratory work in engineering education2009Conference paper (Refereed)
    Abstract [en]

    It is obvious that our society needs more engineers. It is also true that mankind must live in symbiosis with nature and focus on sustainability and understanding. Thus, engineers must be able to design products and services which are in line with the principles of nature and the only way to become familiar with these principles is to perform many physical experiments. A way to use instructional laboratories more effectively and offer more hours in the laboratories for students without significant increased cost per student is opening them for remote access. Hands-on experiments are indispensable but remote mouse-cursor-on ones can supplement them. The VISIR (Virtual Instrument Systems in Reality) Open Laboratory Platform offers an open standard for online workbenches enabling students not only to perform physical experiments 24/7 but also to practice laboratory work. Learning objectives of laboratory work, free access to laboratory resources, and individual assessment of such work should be important key elements in an education delivering engineers with a solid documented laboratory experience.

  • 6. Gustavsson, Ingvar
    et al.
    Nilsson, Kristian
    Lagö, Thomas L
    The VISIR Open Lab Platform2009Conference paper (Other academic)
    Abstract [en]

    The VISIR Open Lab Platform is a client/server application enabling learners to perform physical electrical experiments over the Internet using a web browser. Virtual front panels and a virtual breadboard displayed on the client PCs are used to control the physical equipment giving the learners the impression that they are working in a real laboratory.

  • 7.
    Gustavsson, Ingvar
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Nilsson, Kristian
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Zackrisson, Johan
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Alves, G.R.
    Fidalgo, A.V.
    Claesson, L.
    Zubia, J.G.
    Jayo, U.H.
    Castro, M.
    Diaz Orueta, G.
    Loro, F.G.
    Lab sessions in VISIR laboratories2016In: Proceedings of 2016 13th International Conference on Remote Engineering and Virtual Instrumentation, REV 2016, IEEE Press, 2016, p. 350-352Conference paper (Refereed)
    Abstract [en]

    Experimental activities with real components are an essential part of all courses including or devoted to electrical and electronic circuits theory and practice. The knowledge triangle composed of hand-written exercises, simulations and traditional lab experiments has been enriched with the possibility for students to conduct real experiments over the Internet, using remote labs. This tutorial is devoted to one such remote lab named Virtual Instrument Systems in Reality (VISIR). The Global Online Laboratory Consortium (GOLC) elected VISIR as the best remote controlled laboratory in the world, at the first time this distinction was awarded. At the end of this tutorial, attendees are expected to know what is VISIR, what can (not) be done with it, who is currently using it, and how can one integrate it in a given course curriculum.

  • 8.
    Gustavsson, Ingvar
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Nilsson, Kristian
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Zackrisson, Johan
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Garcia-Zubia, J.
    Hernandez-Jayo, U.
    Nedic, Z
    Göl, Ö.
    MacHotka, J.
    Håkansson, Lars
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Pettersson, Mats
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    On objectives of instructional laboratories, individual assessment, and use of collaborative remote laboratories2009In: IEEE Transactions on Learning Technologies, ISSN 1939-1382, E-ISSN 1939-1382, Vol. 2, no 4, p. 263-274Article in journal (Refereed)
    Abstract [en]

    Three key issues should be addressed to enable universities to deliver engineers who have a solid documented laboratory experience enabling them to design goods and services complying with the requirements of a sustainable society. First, introduce learning objectives of engineering instructional laboratories in courses including laboratory components. Second, implement individual student assessment. Third, introduce free access to online experimental resources as a supplement to the equipment in traditional laboratories. Blekinge Institute of Technology (BTH) in Sweden and the University of South Australia (UniSA) have created online laboratory workbenches for electrical experiments that mimic traditional ones by combining virtual and physical reality. Online workbenches not only supplement traditional ones, but they can also be used for low-cost individual assessment. BTH has started a project disseminating the BTH workbench concept, The Virtual Instrument Systems in Reality (VISIR) Open Laboratory Platform, and invites other universities to set up replicas and participate in further development and standardization. Further, online workbenches offer additional learning possibilities. UniSA has started a project where students located in different countries can perform experiments together as a way to enhance the participants' intercultural competence. This paper discusses online laboratory workbenches and their role in an engineering education appropriate for a sustainable society.

  • 9. Gustavsson, Ingvar
    et al.
    Zackrisson, Johan
    Bartunek, Josef Ström
    Nilsson, Kristian
    Håkansson, Lars
    Claesson, Ingvar
    Lagö, Thomas L
    Telemanipulator for Remote Wiring of Electrical Circuits2008Conference paper (Refereed)
    Abstract [en]

    Nowadays, students want extended access to learning resources and increased freedom to organize their learning activities. Remote access to laboratories enables students to perform physical experiments on their own 24/7. It is easy to control most electronic instruments remotely but some kind of telemanipulator is often required. The Signal Processing Department (ASB) at Blekinge Institute of Technology (BTH) has created an online lab workbench for electrical experiments, mimicking and supplementing workbenches in local laboratories. Students being at home can, for example, use the online workbench in order to prepare themselves for supervised lab sessions and/or participate in such sessions taking place in a local laboratory. A virtual breadboard is used to control a telemanipulator (switching matrix) performing the circuit wiring. Together with virtual front panels depicting the front panels of the desktop instruments, it gives distant students the impression that they are working in a real laboratory. This paper describes the virtual breadboard and switching matrix combination, which can be used in many switching applications.

  • 10. Gustavsson, Ingvar
    et al.
    Zackrisson, Johan
    Nilsson, Kristian
    Garcia-Zubia, Javier
    Håkansson, Lars
    Claesson, Ingvar
    Lagö, Thomas L
    A Flexible Instructional Electronics Laboratory with Local and Remote Lab Workbenches in a Grid2008Conference paper (Refereed)
    Abstract [en]

    The Signal Processing Department (ASB) at Blekinge Institute of Technology (BTH) has created two online lab workbenches, one for electrical experiments and one for mechanical vibration experiments, mimicking and supplementing workbenches in traditional labo-ratories. Since some years, the workbenches are used concurrently with on-site ones in regular supervised lab sessions. The students are also free to use them on their own around the clock e.g. for preparation. The electronic workbench can be used simultane-ously by many students. The aim of a project known as VISIR (Virtual Systems in Reality) founded by ASB at the end of 2006, is disseminating the online lab workbenches using open source technologies. The goal is to create a template for a grid laboratory where the nodes are workbenches for electrical ex-periments, located at different universities. This paper focuses on standards, pedagogical aspects, and measurement procedure requirements.

  • 11. Gustavsson, Ingvar
    et al.
    Zackrisson, Johan
    Nilsson, Kristian
    Garcia-Zubia, Javier
    Håkansson, Lars
    Claesson, Ingvar
    Lagö, Thomas L
    A Flexible Instructional Electronics Laboratory with Local and Remote Lab Workbenches in a Grid2008In: International Journal of Online Engineering, ISSN 1868-1646, E-ISSN 1861-2121, Vol. 4, no 2, p. 12-16Article in journal (Refereed)
    Abstract [en]

    The Signal Processing Department (ASB) at Blekinge Institute of Technology (BTH) has created two online lab workbenches; one for electrical experiments and one for mechanical vibration experiments, mimicking and supplementing workbenches in traditional laboratories. For several years now, the workbenches have been used concurrently with on-site ones in regular, supervised lab sessions. The students are encouraged to use them on a 24/7 basis for example, in preparation for supervised sessions. The electronic workbench can be used simultaneously by many students. The aim of a project known as VISIR (Virtual Systems in Reality) founded by ASB at the end of 2006, is to disseminate the online lab workbenches using open source technologies. The goal is to create a template for a grid laboratory where the nodes are workbenches for electrical experiments, located at different universities. This paper focuses on standards, pedagogical aspects, and measurement procedure requirements.

  • 12.
    Khan, Imran
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Muthusamy, Dinesh
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Ahmad, Wasim
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Nilsson, Kristian
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Zackrisson, Johan
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Gustavsson, Ingvar
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Håkansson, Lars
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Remotely controlled laboratory setup for Active Noise Control and acoustic experiments2012Conference paper (Refereed)
    Abstract [en]

    This paper presents a remotely controlled educational experiments setup for Active Noise Control (ANC) and acoustic experiments. The experiments setup is based on the Virtual Instruments Systems in Reality (VISIR) open source platform, National Instruments LabVIEW software and a Digital Signal Processor TMS320C6713 from Texas Instruments. The software development and equipment are controlled remotely form a client PC using a standard web browser. The proposed laboratory setup focuses on ANC experiments applied to noise in a ventilation duct. The laboratory setup will enable students to test and investigate properties and behaviour of adaptive algorithms in reality as compared to more confined simulations usually carried out in Matlab etc. The general steps in ANC, such as the feasibility of active control, designing, testing and debugging ANC algorithms, configuration and implementation of an active control system, are all covered. In addition students will be able to study the effect of analog to digital converters (ADC), anti-aliasing filters, digital to analog converters (DAC) and reconstruction filters using digital signal processing in reality, etc. The laboratory setup is suitable for a wide range of courses such as sound related experiments in upper secondary school physics, digital signal processing, adaptive signal processing, and acoustics at university level.

  • 13.
    khan, Imran
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Muthusamy, Dineshkumar
    Ahmad, Waqas
    Gustavsson, Ingvar
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Zackrisson, Johan
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Nilsson, Kristian
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Håkansson, Lars
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Remotely Controlled Laboratory Setup for Active Noise Control and Acoustic Experiments2012Conference paper (Refereed)
    Abstract [en]

    This paper presents a remotely controlled educational experiments setup for Active Noise Control (ANC) and acoustic experiments. The experiments setup is based on the Virtual Instruments Systems in Reality (VISIR) open source platform, National Instruments LabVIEW software and a Digital Signal Processor TMS320C6713 from Texas Instruments. The software development and equipment are controlled remotely form a client PC using a standard web browser. The proposed laboratory setup focuses on ANC experiments applied to noise in a ventilation duct. The laboratory setup will enable students to test and investigate properties and behaviour of adaptive algorithms in reality as compared to more confined simulations usually carried out in Matlab etc. The general steps in ANC, such as the feasibility of active control, designing, testing and debugging ANC algorithms, configuration and implementation of an active control system, are all covered. In addition students will be able to study the effect of analog to digital converters (ADC), anti-aliasing filters, digital to analog converters (DAC) and reconstruction filters using digital signal processing in reality, etc. The laboratory setup is suitable for a wide range of courses such as sound related experiments in upper secondary school physics, digital signal processing, adaptive signal processing, and acoustics at university level.

  • 14.
    khan, Imran
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Muthusamy, Dineshkumar
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Ahmad, Waqas
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Gustavsson, Ingvar
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Zackrisson, Johan
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Nilsson, Kristian
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Johansson, Sven
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Håkansson, Lars
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Remotely Controlled Active Noise Control Laboratories2012Conference paper (Refereed)
    Abstract [en]

    Remotely controlled laboratories in educational institutions are gaining popularity at an exponential rate due to the multidimensional benefits they provide. The Virtual Instrument Systems in Reality (VISIR) project by Blekinge Institute of Technology (BTH) Sweden has successfully implemented remotely controlled laboratories, with remotely controlled real instruments and experimental setups. Currently these laboratories provide students the opportunity to conduct experiments in the field of electronics, antenna theory and mechanical vibration measurements. In this paper a prototype system of a remotely controlled laboratory for active noise control (ANC) is introduced. The proposed lab will focus on addressing the problem of a ventilation duct noise. The laboratory is informative and to a great extent introduces a student to the general steps in ANC when it is suggested as a plausible solution for a noise problem. The student can perform an investigation concerning feasibility of active control, design, configuration and implementation of an active control system. The laboratory is based on a modern and relevant DSP platform with the corresponding software development environment controlled remotely. In addition, it may be utilized remotely both for lab assignments in acoustics courses and digital signal processing courses.

  • 15.
    Khan, Imran
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Muthusamy, Dineshkumar
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Ahmad, Waqas
    Sällberg, Benny
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Nilsson, Kristian
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Zackrisson, Johan
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Gustavsson, Ingvar
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Håkansson, Lars
    Performing active noise control and acoustic experiments remotely2012In: International Journal of Online Engineering, ISSN 1868-1646, E-ISSN 1861-2121, Vol. 8, no special issue 2, p. 65-74Article in journal (Refereed)
    Abstract [en]

    This paper presents a novel and advanced remotely controlled laboratory for conducting Active Noise Control (ANC), acoustic and Digital Signal Processing (DSP) experiments. The laboratory facility, recently developed by Blekinge Institute of Technology (BTH) Sweden, supports remote learning through internet covering beginners level such as simple experimental measurements to advanced users and even researchers such as algorithm development and their performance evaluation on DSP. The required software development for ANC algorithms and equipment control are carried out anywhere in the world remotely from an internet-connected client PC using a standard web browser. The paper describes in detail how ANC, acoustic and DSP experiments can be performed remotely The necessary steps involved in an ANC experiment such as validity of ANC, forward path estimation and active control applied to a broad band random noise [0-200Hz] in a ventilation duct will be described in detail. The limitations and challenges such as the forward path and nonlinearities pertinent to the remote laboratory setup will be described for the guidance of the user. Based on the acoustic properties of the ventilation duct some of the possible acoustic experiments such as mode shapes analysis and standing waves analysis etc. will also be discussed in the paper.

  • 16. Larsson, Martin
    et al.
    Nilsson, Kristian
    Johansson, Sven
    Claesson, Ingvar
    Håkansson, Lars
    An Active Noise Control Approach for Attenuating Noise Above the Plane Wave Region in Ducts2011Conference paper (Refereed)
    Abstract [en]

    In a narrow duct, a relatively simple single-channel feedforward ANC system may be used to attenuate noise propagating as plane waves. However, for ducts with larger dimensions the cut-on frequencies for one or several higher-order acoustic modes may be within the frequency range where ANC is applied. In such situations it is generally necessary to use a multiplechannel feedforward ANC system with several secondary sources, error sensors, and perhaps reference sensors. Such a system has a significantly higher complexity than a single-channel ANC system. In this paper another approach is described. Instead of using a multiple-channel feedforward ANC system on a duct of large dimension, the idea is to divide the duct into several more narrow parallel ducts. In this way the complexity of the ANC system may be reduced. In the experiments conducted for this paper, a duct was divided into two more narrow ducts. The noise propagating in each duct was controlled by a feedforward ANC system based on the leaky filtered-x LMS algorithm, where different reference- and error microphone configurations were used. The different configurations were compared to a configuration where the noise in respective narrow duct was controlled using a basic single-channel ANC system per duct. The results preliminary show that high attenuation of low-frequency noise in a duct of large dimension may be achieved using this approach.

  • 17.
    Lima, Natercia
    et al.
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Viegas, Maria Clara
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Zannin, Marcelo
    Universidade Federal de Santa Catarina, BRA.
    Marques, Arcelina
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Alves, Gustavo
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Felgueiras, Carlos
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Costa, Ricardo
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Fidalgo, André
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Marchisio, Susana
    Universidad Nacional de Rosario, ARG.
    Lerro, Federico
    Universidad Nacional de Rosario, ARG .
    Merendino, Claudio
    Universidad Nacional de Rosario, ARG.
    Da Silva, Juarez
    Universidade Federal de Santa Catarina, BRA.
    Pozzo, Maria Isabel
    Consejo Nacional de Investigaciones Cientificas y Tecnicas, ARG.
    Dobboletta, Elsa
    Consejo Nacional de Investigaciones Cientificas y Tecnicas, ARG.
    Gustavsson, Ingvar
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Nilsson, Kristian
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Garcia-Peñalvo, Francisco
    Universidad de Salamanca, ESP.
    Do students really understand the difference between simulation and remote labs?2017In: ACM International Conference Proceeding Series, Association for Computing Machinery , 2017Conference paper (Refereed)
    Abstract [en]

    Laboratory experiments play a crucial role in engineering education as they strongly contribute to the development of important skills for the professional practice. This paper addresses a students' understanding gap between simulations and remote labs. These two resources (and namely the remote laboratory VISIR - Virtual Instrument Systems in Reality) have been commonly used on several didactical implementations, along with other didactical resources in different Engineering degrees at the Federal University of Santa Catarina and Polytechnic of Porto School of Engineering. This work, developed in the scope of the VISIR+ Project, intends to evaluate students' perceptions considering simulation and remote lab results. Quantitative and qualitative data were analyzed to better understand how deeply students realize the differences between these resources and their type of data. Preliminary results indicate that a considerable number of student's don't have a clear idea of these differences, even though sometimes they know their definition. Furthermore, this gap does not seem to differ much with the context (country, course, academic year, course content), students' final grades, teacher approach or implemented tasks. © 2017 Association for Computing Machinery.

  • 18.
    Magnus, Berggren
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Nilsson, Kristian
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Håkansson, Lars
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Agnesson, Helen
    Hedsten, Stefan
    Noise measurements in incubators at neonatal intensive care unit2012Conference paper (Refereed)
    Abstract [en]

    The purpose of this study was to investigate the noise properties and levels of common noise sources in a neonatal intensive care unit (NICU) and in particular inside and around an incubator. Many previous studies have been made on noise levels in NICU, frequently focusing on A-weighted sound levels. In this study it was not assumed that infant's hearing follows the same equal loudness curve as adults and hence instead of A-weighting, short time averaged sound spectra in the frequency range 20 Hz to 20 kHz was logged to identify the frequency distribution of specific noise generating events. It was seen that alarms and CPAP air-flow increased the noise level by up to 8 dB outside but was barely noticed inside when considering the un-weighted noise level. However, by analyzing individual frequencies, most events were noticeable inside the incubator. For instance, frequencies above 1 kHz were increased by 10 dB inside and 11 dB outside the incubator when CPAP was turned on. Opening and closing the incubator increased the un-weighted noise level by 8 dB inside and 7 dB outside.

  • 19.
    Nilsson, Kristian
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Development and Evaluation of OpenLabs and the VISIR Open Electronics and Radio Signal Laboratory for Education Purpose2014Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Part I and II of this thesis constitute a theoretical and practical approach on how to open up a laboratory for remote access and enabling students to have access to the equipment 24/7. Part I covers a more general solution for enabling remote access to equipment; the suggested solution can be applied to all types of instruments that can be controlled from a PC based system. Part III and IV of this thesis present an encouragement to collaborate within in the field of remote engineering to utilize the recourses more efficiently. The idea is that universities around the world can share their experiments in a grid laboratory; every university contributes with a small part, but gets access to a wide range of experiments in this grid. Part V of this thesis concerns the modelling and simulation of the remote electronics laboratory with the purpose of estimating the maximum number of simultaneous users without losing the experience of working with a real instrument. The results indicate that one single remote electronics laboratory can handle up to 120 users simultaneously and with 120 users the delay for each user is approximately 2 seconds.

  • 20. Nilsson, Kristian
    et al.
    Zackrisson, Johan
    Pettersson, Mats
    Remote Access of Computer Controlled Experiments2008In: International Journal of Online Engineering, ISSN 1868-1646, E-ISSN 1861-2121, Vol. 4, no 4, p. 52-56Article in journal (Refereed)
    Abstract [en]

    In this paper, we present a way for students to access and operate laboratory equipment, controlled by a laboratory computer via a remote access program. In this way, the solution is not dependent on the specific laboratory equipment, as long as the equipment can be remotely controlled. The system can easily be altered to be used in another laboratory setup. Students are able to make reservations of experiment sessions through a web interface, which is administrated by the system administrator. The solution proposed in this paper is one way to speed up the development of remote accessible laboratories. Most of the proposed solution is based on open source software and the hardware is built on ordinary consumer parts, which makes the proposed remote laboratory architecture cost effective.

  • 21. Nilsson, Kristian
    et al.
    Zackrisson, Johan
    Pettersson, Mats
    Remote Access of Computer Controlled Experiments2008Conference paper (Refereed)
    Abstract [en]

    In this paper, we present a way for students to access and operate laboratory equipment, controlled by a laboratory computer via a remote access program. In this way, the solution is not dependent on the specific laboratory equipment, as long as the equipment can be remotely controlled. The system can easily be altered to be used in another laboratory setup. Students are able to make reservations of experiment sessions through a web interface, which is administrated by the system administrator. The solution proposed in this paper is one way to speed up the development of remote accessible laboratories. Most of the proposed solution is based on open source software and the hardware is built on ordinary consumer parts, which makes the proposed remote laboratory architecture cost effective.

  • 22.
    Swartling, Mikael
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Ström Bartunek, Josef
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Nilsson, Kristian
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Gustavsson, Ingvar
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Fiedler, Markus
    Blekinge Institute of Technology, School of Computing.
    Simulations of the VISIR Open Lab Platform2012Conference paper (Refereed)
    Abstract [en]

    This paper presents a queue simulation of the VISIR Open Lab Platform. A model of the platform and statistical distributions of how users interact with the system based on real log files are presented. The system is then simulated in order to determine how many concurrent students that can be allowed to use the platform while at the same time keeping a low response time to ensure the quality of the service. The results show, in a worst case setup with approximately 300 ms response time per experiment, that roughly 100 concurrent users is an upper limit to ensure an average response time below 2 s. The results also show that raising the limit of the desired experiment response time does not necessarily increase the number allowed concurrent users significantly once the system is saturated. However, improving the experiment response time can significantly increase the number of users that can simultaneously be connected.

  • 23. Tawfik, Mohamed
    et al.
    Sancristobal, Elio
    Sergio, Martin
    Gil, Rosario
    Diaz, Gabriel
    Colmenar, Antonio
    Nilsson, Kristian
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Zackrisson, Johan
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Håkansson, Lars
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Gustafsson, Ingvar
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Virtual Instrument Systems in Reality (VISIR) for Remote Wiring and Measurement of Electronic Circuits on Breadboard2013In: IEEE Transactions on Learning Technologies, ISSN 1939-1382, E-ISSN 1939-1382, Vol. 6, no 1, p. 60-72Article in journal (Refereed)
    Abstract [en]

    This paper reports on a state-of-the-art remote laboratory project called Virtual Instrument Systems in Reality (VISIR). VISIR allows wiring and measuring of electronic circuits remotely on a virtual workbench that replicates physical circuit breadboards. The wiring mechanism is developed by means of a relay switching matrix connected to a PCI eXtensions for Instrumentation (PXI) instrumentation platform. The entire equipment is controlled by LabVIEW server software, in addition to a measurement server software that protects the equipment from hazard connections by verifying input circuit designs, sent by students, before being executed. This paper addresses other approaches such as remote labs based on Data Acquisition Cards (DAQs), NetLab, and RemotElectLab, comparing them with VISIR in order to emphasize its singularity. Topics discussed are as follows: the technical description, software, operation cycle, features, and provided services. In addition, the feedback received by students at several universities and the encountered drawbacks along with the proposed solutions are highlighted. The paper finally addresses the ongoing and future challenges within the VISIR community including its integration with Learning Management Systems (LMSs) and iLab Shared Architecture (ISA), its new hardware version release that is based on LAN eXtensions for Instrumentation (LXI), and its new open platform version that supports federated access.

1 - 23 of 23
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