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This Special Issue contains selected papers from works presented at the 10th EASN International Conference on Innovation in Aviation & Space to the Satisfaction of the European Citizens, which was held successfully from the 2nd until the 4th of September, 2020
Liberata Guadagno; Spiros Pantelakis; Andreas Strohmayer. Special Issue “10th EASN International Conference on Innovation in Aviation & Space to the Satisfaction of the European Citizens”. Aerospace 2021, 8, 111 .
AMA StyleLiberata Guadagno, Spiros Pantelakis, Andreas Strohmayer. Special Issue “10th EASN International Conference on Innovation in Aviation & Space to the Satisfaction of the European Citizens”. Aerospace. 2021; 8 (4):111.
Chicago/Turabian StyleLiberata Guadagno; Spiros Pantelakis; Andreas Strohmayer. 2021. "Special Issue “10th EASN International Conference on Innovation in Aviation & Space to the Satisfaction of the European Citizens”." Aerospace 8, no. 4: 111.
This Special Issue contains selected papers from works presented at the 9th EASN International Conference on Innovation in Aviation & Space, which was successfully held in Athens, Greece, between the 3rd and 6th of September 2019
Spiros Pantelakis; Andreas Strohmayer. Special Issue “9th EASN International Conference on Innovation in Aviation & Space”. Aerospace 2021, 8, 110 .
AMA StyleSpiros Pantelakis, Andreas Strohmayer. Special Issue “9th EASN International Conference on Innovation in Aviation & Space”. Aerospace. 2021; 8 (4):110.
Chicago/Turabian StyleSpiros Pantelakis; Andreas Strohmayer. 2021. "Special Issue “9th EASN International Conference on Innovation in Aviation & Space”." Aerospace 8, no. 4: 110.
Recently, the new Green Deal policy initiative was presented by the European Union. The EU aims to achieve a sustainable future and be the first climate-neutral continent by 2050. It targets all of the continent’s industries, meaning aviation must contribute to these changes as well. By employing a systems engineering approach, this high-level task can be split into different levels to get from the vision to the relevant system or product itself. Part of this iterative process involves the aircraft requirements, which make the goals more achievable on the system level and allow validation of whether the designed systems fulfill these requirements. Within this work, the top-level aircraft requirements (TLARs) for a hybrid-electric regional aircraft for up to 50 passengers are presented. Apart from performance requirements, other requirements, like environmental ones, are also included. To check whether these requirements are fulfilled, different reference missions were defined which challenge various extremes within the requirements. Furthermore, figures of merit are established, providing a way of validating and comparing different aircraft designs. The modular structure of these aircraft designs ensures the possibility of evaluating different architectures and adapting these figures if necessary. Moreover, different criteria can be accounted for, or their calculation methods or weighting can be changed.
Dominik Eisenhut; Nicolas Moebs; Evert Windels; Dominique Bergmann; Ingmar Geiß; Ricardo Reis; Andreas Strohmayer. Aircraft Requirements for Sustainable Regional Aviation. Aerospace 2021, 8, 61 .
AMA StyleDominik Eisenhut, Nicolas Moebs, Evert Windels, Dominique Bergmann, Ingmar Geiß, Ricardo Reis, Andreas Strohmayer. Aircraft Requirements for Sustainable Regional Aviation. Aerospace. 2021; 8 (3):61.
Chicago/Turabian StyleDominik Eisenhut; Nicolas Moebs; Evert Windels; Dominique Bergmann; Ingmar Geiß; Ricardo Reis; Andreas Strohmayer. 2021. "Aircraft Requirements for Sustainable Regional Aviation." Aerospace 8, no. 3: 61.
The high-power density and good scaling properties of electric motors enable new propulsion arrangements and aircraft configurations. This results in distributed propulsion systems allowing to make use of aerodynamic interaction effects between individual propellers and the wing of the aircraft, improving flight performance and thus reducing in-flight emissions. In order to systematically analyze these effects, an unmanned research platform was designed and built at the University of Stuttgart. As the aircraft is being used as a testbed for various flight performance studies in the field of distributed electric propulsion, a methodology for precise identification of its performance characteristics is required. One of the main challenges is the determination of the total drag of the aircraft to be able to identify an exact drag and lift polar in flight. For this purpose, an on-board measurement system was developed which allows for precise determination of the thrust of the aircraft which equals the total aerodynamic drag in steady, horizontal flight. The system has been tested and validated in flight using the unmanned free-flight test platform. The article provides an overview of the measuring system installed, discusses its functionality and shows results of the flight tests carried out.
Dominique Bergmann; Jan Denzel; Ole Pfeifle; Stefan Notter; Walter Fichter; Andreas Strohmayer. In-flight Lift and Drag Estimation of an Unmanned Propeller-Driven Aircraft. Aerospace 2021, 8, 43 .
AMA StyleDominique Bergmann, Jan Denzel, Ole Pfeifle, Stefan Notter, Walter Fichter, Andreas Strohmayer. In-flight Lift and Drag Estimation of an Unmanned Propeller-Driven Aircraft. Aerospace. 2021; 8 (2):43.
Chicago/Turabian StyleDominique Bergmann; Jan Denzel; Ole Pfeifle; Stefan Notter; Walter Fichter; Andreas Strohmayer. 2021. "In-flight Lift and Drag Estimation of an Unmanned Propeller-Driven Aircraft." Aerospace 8, no. 2: 43.
Purpose The separation of energy conversion and propulsor is a promising aspect of hybrid-electric propulsion systems, allowing for increased installation efficiencies and setting the basis for distributed propulsion concepts. University of Stuttgart’s Institute of Aircraft Design has a long experience with electrically powered aircraft, starting with Icaré 2, a solar-powered glider flying, since 1996. Icaré 2 recently has been converted to a three-engine motor glider with two battery-powered wing-tip propellers, in addition to the solar-powered main electric motor. This adds propulsion redundancy and will allow analyzing yaw control concepts with differential thrust and the propeller-vortex interaction at the wing-tip. To ensure airworthiness for this design modification, new ground vibration tests (GVTs) and flutter calculations are required. The purpose of this paper is to lay out the atypical approach to test execution due to peculiarities of the Icaré 2 design such as an asymmetrical aileron control system, the long wing span with low frequencies of the first mode and elevated wing tips bending under gravity and thus affecting the accuracy of the wing torsion frequency measurements. Design/methodology/approach A flutter analysis based on GVT results is performed for the aircraft in basic configuration and with wing tip propulsors in pusher or tractor configuration. Apart from the measured resonant modes, the aircraft rigid body modes and the control surface mechanism modes are taken into consideration. The flutter calculations are made by a high-speed, low-cost software named JG2 based on the strip theory in aerodynamics and the V-g method of flutter problem solution. Findings With the chosen atypical approach to GVT the impact of the suspension on the test results was shown to be minimal. Flutter analysis has proven that the critical flutter speed of Icaré 2 is sufficiently high in all configurations. Practical implications The atypical approach to GVT and subsequent flutter analysis have shown that the effects of wing-tip propulsors on aeroelasticity of the high aspect ratio configuration do not negatively affect flutter characteristics. This analysis can serve as a basis for an application for a permit to fly. Originality/value The presented methodology is valuable for the flutter assessment of aircraft configurations with atypical aeroelastic characteristics.
Wojciech Chajec; Wieslaw A. Krzymien; Andreas Strohmayer. The effect of wing-tip propulsors on Icaré 2 aeroelasticity. Aircraft Engineering and Aerospace Technology 2019, 91, 509 -524.
AMA StyleWojciech Chajec, Wieslaw A. Krzymien, Andreas Strohmayer. The effect of wing-tip propulsors on Icaré 2 aeroelasticity. Aircraft Engineering and Aerospace Technology. 2019; 91 (3):509-524.
Chicago/Turabian StyleWojciech Chajec; Wieslaw A. Krzymien; Andreas Strohmayer. 2019. "The effect of wing-tip propulsors on Icaré 2 aeroelasticity." Aircraft Engineering and Aerospace Technology 91, no. 3: 509-524.
Future aircraft design highly depends on the successful implementation of new technologies. However, the gap between conventional designs and new visions often comes with a high financial risk. This significantly complicates the integration of innovations. Scaled unmanned aircraft systems (UAS) are an innovative and cost-effective way to get new configurations and technologies in-flight. Therefore the Institute of Aircraft Design developed the e-Genius-Mod taking into account all relevant similitude requirements. It is a scale model of the electric motor glider e-Genius. Since the Reynolds number for the free-flight model cannot be adhered to, an airfoil was developed with lift-to-drag and lift-to-angle-of-attack courses reproducing the full-scale e-Genius flight characteristics. This will enable testing and assessment of new aviation technologies in a scaled version with an opportunity for free-flight demonstration in relevant environment.
Dominique Paul Bergmann; Jan Denzel; Asmus Baden; Lucas Kugler; Andreas Strohmayer. Innovative Scaled Test Platform e-Genius-Mod—Scaling Methods and Systems Design. Aerospace 2019, 6, 20 .
AMA StyleDominique Paul Bergmann, Jan Denzel, Asmus Baden, Lucas Kugler, Andreas Strohmayer. Innovative Scaled Test Platform e-Genius-Mod—Scaling Methods and Systems Design. Aerospace. 2019; 6 (2):20.
Chicago/Turabian StyleDominique Paul Bergmann; Jan Denzel; Asmus Baden; Lucas Kugler; Andreas Strohmayer. 2019. "Innovative Scaled Test Platform e-Genius-Mod—Scaling Methods and Systems Design." Aerospace 6, no. 2: 20.