| 1. |
- Conte, Gianpaolo, 1974-, et al.
(författare)
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High Accuracy Ground Target Geo-Location Using Autonomous Micro Aerial Vehicle Platforms
- 2008
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Ingår i: Proceedings of the AIAA Guidance, Navigation, and Control Conference (GNC). - : AIAA. - 9781563479458
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Konferensbidrag (refereegranskat)abstract
- This paper presents a method for high accuracy ground target localization using a Micro Aerial Vehicle (MAV) equipped with a video camera sensor. The proposed method is based on a satellite or aerial image registration technique. The target geo-location is calculated by registering the ground target image taken from an on-board video camera with a geo- referenced satellite image. This method does not require accurate knowledge of the aircraft position and attitude, therefore it is especially suitable for MAV platforms which do not have the capability to carry accurate sensors due to their limited payload weight and power resources. The paper presents results of a ground target geo-location experiment based on an image registration technique. The platform used is a MAV prototype which won the 3rd US-European Micro Aerial Vehicle Competition (MAV07). In the experiment a ground object was localized with an accuracy of 2.3 meters from a ight altitude of 70 meters.
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| 2. |
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| 3. |
- Jouannet, Christopher, 1974-, et al.
(författare)
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Aerodynamic database of a subscale demonstrator
- 2017
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Ingår i: 35th AIAA Applied Aerodynamics Conference. - Reston, VA, USA : American Institute of Aeronautics and Astronautics.
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Konferensbidrag (refereegranskat)abstract
- This paper reports the current status of a joint Swedish-Brazilian research project aiming at exploring sub scale flight testing. A 13% scale fighter aircraft is used as a test bench for developing methods and procedures for data acquisition. This paper will present an aerodynamic database as a partial result of the collaborative project.
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| 4. |
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| 5. |
- Lundström, David, 1978-, et al.
(författare)
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Micro Aerial Vehicle Design Optimization using Mixed Discrete and Continuous Variables
- 2006
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Ingår i: A collection of technical papers : 11th AIAAA/ISSMO Multidisciplinary Analysis and Optimization Conferences. - Reston, Virginia, USA : American Institute of Aeronautics and Astronautics. - 9781563478239 ; , s. 1277-1290
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Konferensbidrag (refereegranskat)abstract
- Micro or mini aerial vehicles are characterized by the fact that they are likely to be build in relatively low numbers for the sensors and equipment available at the time of deployment. Therefore "design and build on demand" is very attractive, where a modular concept with a more or less automated design process is desirable. In this paper design automation of a Micro or Mini Aerial Vehicle (MAV) is demonstrated using design optimization with both discrete and continuous variables. This involves both selections of components for the propulsion system, as well as geometrical parameters for the airframe.
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| 6. |
- Lundström, David, 1978-, et al.
(författare)
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RAVEN - A Subscale Radio Controlled Business Jet Demonstrator
- 2008
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Ingår i: proceedings from the ICAS 2008, CD-ROM. - Anchorage : International Council of the Aeronautical Sciences, (ICAS).
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Konferensbidrag (refereegranskat)abstract
- A dynamically scaled model of a Business-Jet has been build and is undergoing testing at Linköping University. The goal of the project was to understand the difficutlties of dynamic scaling and how to extract useful data from subscale flight testing. This paper presents the experience made during the projects up to the time of writing, and includes details from manufacturing, ground testing equipment such as car top testing, in flight data acquisition system design and preparation for the fligt testing.
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| 7. |
- Nepomuceno, Leonardo Murilo, et al.
(författare)
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Estimation of lift characteristics of a subscale fighter using low-cost experimental methods
- 2022
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Ingår i: AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY. - : EMERALD GROUP PUBLISHING LTD. - 1748-8842. ; 94:8, s. 1379-1389
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Tidskriftsartikel (refereegranskat)abstract
- Purpose While computational methods are prevalent in aircraft conceptual design, recent advances in mechatronics and manufacturing are lowering the cost of practical experiments. Focussing on a relatively simple property, the lift curve, this study aims to increase understanding of how basic aerodynamic characteristics of a complex stealth configuration can be estimated experimentally using low-cost equipment, rapid prototyping methods and remotely piloted aircraft. Design/methodology/approach Lift curve estimates are obtained from a wind tunnel test of a three-dimensional-printed, 3.8%-scale model of a generic fighter and from flight testing a 14%-scale demonstrator using both a simple and a more advanced identification technique based on neural networks. These results are compared to a computational fluid dynamics study, a panel method and a straightforward, theoretical approach based on radical geometry simplifications. Findings Besides a good agreement in the linear region, discrepancies at high angles of attack reveal the shortcomings of each method. The remotely piloted model manages to provide consistent results beyond the physical limitations of the wind tunnel although it seems limited by instrumentation capabilities and unmodelled thrust effects. Practical implications Physical models can, even though low-cost experiments, expand the capabilities of other aerodynamic tools and contribute to reducing uncertainty when other estimations diverge. Originality/value This study highlights the limitations of commonly used aerodynamic methods and shows how low-cost prototyping and testing can complement or validate other estimations in the early study of a complex configuration.
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| 8. |
- Sobron, Alejandro, 1990-, et al.
(författare)
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A Review of Current Research in Subscale Flight Testing and Analysis of Its Main Practical Challenges
- 2021
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Ingår i: Aerospace. - Basel, Switzerland : MDPI. - 2226-4310. ; 8:3
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Tidskriftsartikel (refereegranskat)abstract
- Testing of untethered subscale models, often referred to as subscale flight testing, has traditionally had a relatively minor, yet relevant use in aeronautical research and development. As recent advances in electronics, rapid prototyping and unmanned-vehicle technologies expand its capabilities and lower its cost, this experimental method is seeing growing interest across academia and the industry. However, subscale models cannot meet all similarity conditions required for simulating full-scale flight. This leads to a variety of approaches to scaling and to other alternative applications. Through a literature review and analysis of different scaling strategies, this study presents an overall picture of how subscale flight testing has been used in recent years and synthesises its main issues and practical limitations. Results show that, while the estimation of full-scale characteristics is still an interesting application within certain flight conditions, subscale models are progressively taking a broader role as low-cost technology-testing platforms with relaxed similarity constraints. Different approaches to tackle the identified practical challenges, implemented both by the authors and by other organisations, are discussed and evaluated through flight experiments.
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| 9. |
- Sobron, Alejandro, 1990-, et al.
(författare)
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Flight test design for remotely-piloted aircraft in confined airspace
- 2017
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Ingår i: 6th CEAS Air and Space Conference, Aerospace Europe, 16-20 October, 2017, Bucharest, Romania.. - Brussels.
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Konferensbidrag (refereegranskat)abstract
- 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.
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| 10. |
- Sobron, Alejandro, 1990-, et al.
(författare)
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Methods for efficient flight testing and modelling of remotely piloted aircraft within visual line-of-sight
- 2018
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Ingår i: Proceedings of the 31st Congress of The International Council of the Aeronautical Sciences (ICAS), September 9-14 2018, Belo Horizonte, Brazil.. - Bohn : International Council of the Aeronautical Sciences. - 9783932182884
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Konferensbidrag (refereegranskat)abstract
- 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.
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