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  • 1.
    Lundström, David
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Sobron, Alejandro
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Jouannet, Christopher
    Saab Aeronautics, Linköping, Sweden.
    da Silva, Roberto Gil Annes
    Instituto Tecnológico de Aeronáutica (ITA), Brazil.
    Subscale Flight Testing of a Generic Fighter Aircraft2016In: Proceedings of the 30th Congress of the International Council of the Aeronautical Sciences (ICAS) / [ed] The International Council of the Aeronautical Sciences, Bohn, 2016Conference paper (Refereed)
    Abstract [en]

    Recent technological advances in mechatronics enhance the possibilities of utilizing subscale flight testing as a tool in the development of aircraft. This paper reports the current status of a joint Swedish-Brazilian research project aiming at exploring these possibilities. A 13\% scale fighter aircraft is used as a test bench for developing methods and procedures for data acquisition. The aircraft is equipped with an instrumentation system assembled from off the shelf components as well as open source hardware and software.

  • 2.
    Sobron, Alejandro
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    On Subscale Flight Testing: Applications in Aircraft Conceptual Design2018Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Downscaled physical models, also referred to as subscale models, have played an essential role in the investigation of the complex physics of flight until the recent disruption of numerical simulation. Despite the fact that improvements in computational methods are slowly pushing experimental techniques towards a secondary role as verification or calibration tools, real-world testing of physical prototypes still provides an unmatched confidence. Physical models are very effective at revealing issues that are sometimes not correctly identified in the virtual domain, and hence can be a valuable complement to other design tools. But traditional wind-tunnel testing cannot always meet all of the requirements of modern aeronautical research and development. It is nowadays too expensive to use these scarce facilities to explore different design iterations during the initial stages of aircraft development, or to experiment with new and immature technologies.

    Testing of free-flight subscale models, referred to as Subscale Flight Testing (SFT), could offer an affordable and low-risk alternative for complementing conventional techniques with both qualitative and quantitative information. The miniaturisation of mechatronic systems, the advances in rapid-prototyping techniques and power storage, as well as new manufacturing methods, currently enable the development of sophisticated test objects at scales that were impractical some decades ago. Moreover, the recent boom in the commercial drone industry has driven a quick development of specialised electronics and sensors, which offer nowadays surprising capabilities at competitive prices. These recent technological disruptions have significantly altered the cost-benefit function of SFT and it is necessary to re-evaluate its potential in the contemporary aircraft development context.

    This thesis aims to increase the comprehension and knowledge of the SFT method in order to define a practical framework for its use in aircraft design; focusing on low-cost, short-time solutions that don’t require more than a small organization and few resources. This objective is approached from a theoretical point of view by means of an analysis of the physical and practical limitations of the scaling laws; and from an empirical point of view by means of field experiments aimed at identifying practical needs for equipment, methods, and tools. A low-cost data acquisition system is developed and tested; a novel method for semi-automated flight testing in small airspaces is proposed; a set of tools for analysis and visualisation of flight data is presented; and it is also demonstrated that it is possible to explore and demonstrate new technology using SFT with a very limited amount of economic and human resources. All these, together with a theoretical review and contextualisation, contribute to increasing the comprehension and knowledge of the SFT method in general, and its potential applications in aircraft conceptual design in particular.

    List of papers
    1. Design and Testing of a Low-Cost Flight Control and Data Acquisition System for Unstable Subscale Aircraft
    Open this publication in new window or tab >>Design and Testing of a Low-Cost Flight Control and Data Acquisition System for Unstable Subscale Aircraft
    2016 (English)In: Proceedings of the 30th Congress of The International Council of the Aeronautical Sciences (ICAS), September 25-30, Daejeon, South Korea., Bonn: The International Council of the Aeronautical Sciences , 2016Conference paper, Published paper (Refereed)
    Abstract [en]

    Current research on subscale flight testing methodologies at Linköping University is performed by using various platforms, some of them with advanced configurations. These have been previously flown in open-loop under direct commands from the pilot. However, the interest in flying some of these platforms with relaxed stability and the investigation of multi-surface control allocation techniques motivated the implementation of a simple low-cost flight control system based on commercial-off-the-shelf components. The work described in this paper evaluates the simplest available solutions that provide control augmentation for small, longitudinally unstable, free-flying models. This work also tries to define a reliable, fail-safe system architecture that can be implemented in more advanced platforms. Moreover, data acquisition and analysis are evaluated with the aim of applying system identification techniques.

    Place, publisher, year, edition, pages
    Bonn: The International Council of the Aeronautical Sciences, 2016
    Keywords
    subscale, flight testing, flight control, data acquisition, relaxed stability
    National Category
    Aerospace Engineering
    Identifiers
    urn:nbn:se:liu:diva-142393 (URN)978-3-932182-85-3 (ISBN)
    Conference
    30th Congress of The International Council of the Aeronautical Sciences (ICAS), Daejeon, Korea, September 25-30, Daejeon, South Korea.
    Projects
    MSDEMO
    Available from: 2017-10-30 Created: 2017-10-30 Last updated: 2018-11-05
    2. Subscale Flight Testing of a Generic Fighter Aircraft
    Open this publication in new window or tab >>Subscale Flight Testing of a Generic Fighter Aircraft
    Show others...
    2016 (English)In: Proceedings of the 30th Congress of the International Council of the Aeronautical Sciences (ICAS) / [ed] The International Council of the Aeronautical Sciences, Bohn, 2016Conference paper, Published paper (Refereed)
    Abstract [en]

    Recent technological advances in mechatronics enhance the possibilities of utilizing subscale flight testing as a tool in the development of aircraft. This paper reports the current status of a joint Swedish-Brazilian research project aiming at exploring these possibilities. A 13\% scale fighter aircraft is used as a test bench for developing methods and procedures for data acquisition. The aircraft is equipped with an instrumentation system assembled from off the shelf components as well as open source hardware and software.

    Place, publisher, year, edition, pages
    Bohn: , 2016
    Keywords
    subscale, free flight test, demonstrator, data acquisition
    National Category
    Aerospace Engineering
    Identifiers
    urn:nbn:se:liu:diva-142398 (URN)978-3-932182-85-3 (ISBN)
    Conference
    30th Congress of the International Council of the Aeronautical Sciences (ICAS), September 25-30, Daejeon, South Korea
    Projects
    MSDEMO
    Available from: 2017-10-30 Created: 2017-10-30 Last updated: 2018-11-05
  • 3.
    Sobron, Alejandro
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Lundström, David
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Jouannet, Christopher
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Sandoval Goez, Luiz Carlos
    Instituto Tecnológico de Aeronáutica, Brasil.
    Flight test design for remotely-piloted aircraft in confined airspace2017In: 6th CEAS Air and Space Conference, Aerospace Europe, 16-20 October, 2017, Bucharest, Romania. / [ed] The Council of European Aerospace Societies, Brussels, 2017Conference paper (Refereed)
    Abstract [en]

    Thispaper presents various techniques and procedures that aim to simplify flighttesting of fixed-wing, remotely-piloted aircraft with the purposes ofperformance evaluation and system identification. These methods have beenspecifically developed for flight within visual line-of-sight, a type ofoperation that limits the available airspace severely but offers major costadvantages considering the current regulations for unmanned flight in mostWestern countries.

  • 4.
    Sobron, Alejandro
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Lundström, David
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Larsson, Roger
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Jouannet, Christopher
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Methods for efficient flight testing and modelling of remotely piloted aircraft within visual line-of-sight2018In: Proceedings of the 31st Congress of The International Council of the Aeronautical Sciences (ICAS), September 9-14 2018, Belo Horizonte, Brazil. / [ed] The International Council of the Aeronautical Sciences, Bohn, 2018Conference paper (Refereed)
    Abstract [en]

    Remotely piloted scaled models not only serve as convenient low-risk flying test-beds but also can provide useful data and increase confidence in an eventual full-scale design. Nevertheless, performing advanced flight tests in a safe and cost-effective manner is often a challenge for organizations with limited resources. A typical scenario is testing within visual line-of-sight at very low altitude, a type of operation that offers major cost advantages at the expense of a reduced available airspace. This paper describes some of the authors' work towards efficient performance evaluation and system identification of fixed-wing, remotely piloted aircraft under these challenging conditions. Results show that certain techniques, manoeuvre automation, and platform-optimised multisine input signals can improve the flight test efficiency and the modelling process. It is also probable that some of the benefits observed here could be extrapolated to flight testing beyond visual line-of-sight or even to full-scale flight testing.

  • 5.
    Sobron, Alejandro
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Lundström, David
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Staack, Ingo
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Design and Testing of a Low-Cost Flight Control and Data Acquisition System for Unstable Subscale Aircraft2016In: Proceedings of the 30th Congress of The International Council of the Aeronautical Sciences (ICAS), September 25-30, Daejeon, South Korea., Bonn: The International Council of the Aeronautical Sciences , 2016Conference paper (Refereed)
    Abstract [en]

    Current research on subscale flight testing methodologies at Linköping University is performed by using various platforms, some of them with advanced configurations. These have been previously flown in open-loop under direct commands from the pilot. However, the interest in flying some of these platforms with relaxed stability and the investigation of multi-surface control allocation techniques motivated the implementation of a simple low-cost flight control system based on commercial-off-the-shelf components. The work described in this paper evaluates the simplest available solutions that provide control augmentation for small, longitudinally unstable, free-flying models. This work also tries to define a reliable, fail-safe system architecture that can be implemented in more advanced platforms. Moreover, data acquisition and analysis are evaluated with the aim of applying system identification techniques.

1 - 5 of 5
CiteExportLink to result list
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
More languages
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  • html
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  • asciidoc
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