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International Journal of Sustainable Aviation (6 papers in press)
The role of integration in achieving sustainable benefits from airline alliances by Gamze Orhan, Deniz Taşcı Abstract: Air transport is one of the industries where strategic alliances are most common. While alliance strategies by airlines are widespread, the performance and sustainability of alliances is currently in debate. However, the importance of the level of integration for the benefits from mergers and alliances in the literature is an important topic discussed. In this study, we relate the sustainability of alliances to the benefits gained from that cooperation and aimed to demonstrate the importance of the level of integration on the alliance benefits in the airline industry. To achieve this aim, after a comprehensive literature, we conducted a research on three global airline alliance members. The study comprises 26 international airlines who are members of one of global airline alliances Star, SkyTeam and Oneworld. The results suggest that there is a significant and positive relationship between level of integration of airlines to the global alliance and the alliance benefits gained from the alliance membership. Keywords: strategic alliances; strategic management; sustainable benefits; integration level; airline alliances.
Robust planning the landing process of unmanned aerial vehicles by Nguyen Dinh Dung, Joszef Rohacs Abstract: Unmanned aerial vehicle (UAV) is a particular robotics type that has been studied by scientists in the world. Currently, the study of flying robots in complex environments is relatively well developed and has many achievements. However, the fact that the landing process of UAVs in complex or unknown environments is a significant challenge for scientists. In this paper, the problem that how to determine the desired landing orbit will be solved. The approach and landing process might be constructed from the straight lines and orbit curves. This study indicates that the UAV has four landing trajectories because the UAV can turn left or right to reach the left or right circle in the landing process. The methodology for calculating these landing trajectories will be shown in this paper, which is calculated based on solving aircraft equations of motion and analytical method. The desired landing orbit is the shortest route selected from these trajectories. This paper also shows the methodologies to determine the landing routes that the UAV can be landing in any direction or given direction. The simulation results utilizing MATLAB software show that the calculated landing orbit is the shortest. Keywords: unmanned aerial vehicle; landing trajectory; landing process; desired landing orbit.
Cultural and Political Attitudes Towards Paying to Support Airport Sustainability Projects by Mattie Milner, Dylan Bush, Emily Anania, Taro Ito, Daniel Marte, Stephen Rice, Scott Winter Abstract: The current research explores different factors affecting individuals support for airports implementing environmentally-friendly programs. Using social identity theory, the researchers manipulated participants identification with one of the two major political parties to explore the relationship between political affiliation and support for environmentally-friendly initiatives. Participants (recruited from the U.S. and India) were presented with a hypothetical scenario in which twelve different sustainable aviation projects would be implemented at their local airport. Implementation of these projects would include a $15 fee to their ticket price. Participants were then asked to indicate their support for the additional fee for each of the twelve programs. Results from this study indicate significant differences in acceptance of sustainable aviation programs based on a variety of political and cultural factors. In general, liberals/progressives and Indians were more willing to pay the additional fee, regardless of the type of program. Keywords: sustainable aviation; social identity theory; political affiliation; cultural attitudes; environmental concern; support for sustainable projects.
Turbofan engine weight estimation for preliminary design by Mustafa Karabacak, Onder Turan Abstract: The aim of the study is to prepare weight estimation model of turbofan engines to help designer in the conceptual stages of modern turbofan design. To achieve this purpose, statistical data is used on yielding robust analytical expression and experiments are conducted to prepare model for turbofan engine weight estimation is not easy due to the high cost and insufficient technical facility. Turbofan engine classified into 5 categories (3 shaft turbofan engine, light weight 2 shaft turbofan engine , medium weight 2 shaft turbofan engine, high weight 2 shaft turbofan engine and 2 shaft geared turbofan engine) and turbofan engine weight model is developed for each category separately to increase model sensitivity. Model sensitivity is investigated for each category by error analysis to give idea about model reflection of real world to conceptual designer. Keywords: turbofan engine weight; thrust to weight ratio; bypass ratio; aircraft.
A SIMPLISTIC FLIGHT MODEL FOR EXERGY EMBODIMENT OF COMPOSITE MATERIALS TOWARDS NEARLY-ZERO EXERGY AVIATION by S.A.N. KILKIS, Siir KILKIS Abstract: For airliners, weight is energy spending and money. The heavier a plane, the more fuel it has to carry for a given range that limits the range and lowers the fuel economy. This snowball effect is a major concern not only for the economic outlook of the airline industry but also for the future of sustainable aviation. The motivation of increasing fuel efficiency and improving the aerodynamic performance of new aircraft has led designers to move away from using metals in airframes. Aluminum has the highest embodied energy, exergy, and carbon dioxide emissions among all basic materials while carbon fiber composites have much higher energy and exergy embodiments. For this reason, a careful balance between the advantages of lighter aircraft during operation and the disadvantages of an aircraft with more embodiments must be considered. In this paper, a new model for the embodied exergy payback period is presented, which considers the exergy savings during acceleration and takeoff, climb, trim-level cruise, descent and thrust reversal in landing for each flight versus higher exergy embodiment of composites that are used during manufacturing when compared to metals. The research work has ramifications for determining the optimum balance of lightweight and conventional material usage, thus improving the economic and environmental performance of aircraft for decoupling sustainable aviation and carbon dioxide emissions. The research work concludes with a vision for nearly-zero exergy aviation that involves a complete set of measures for the airside and landside. Considering new metrics for fuel savings and CO2 emissions based on exergy, the use of composite materials in new aircraft requires support from air traffic optimization, jet fuel produced from renewable energy systems, nearly-zero exergy airport terminals, and sustainable taxiing solutions. The research work has the potential for supporting the Carbon Neutral Growth Strategy of the aviation sector. Keywords: Exergy embodiment; CO2 embodiment; fuel economy; composite materials in aircrafts.
Effect of Different Weightage of Enova by A.B.D. RAHIM ABU TALIB, Ibrahim Mohammed, Wahiyuddin Rujhan, Nadiir Bheekhun Abstract: The study presents the use of the green coat of Enova Keywords: Aluminium alloy; composite; Enova® IC3100; Flax fibre; ISO2685 standard.