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International Journal of Sustainable Aviation (9 papers in press)
Total impact estimation to support sustainability of small hybrid aircraft by Agnes Wangai, Kinzhikeyev Sergey, Daniel Rohacs, Jozsef Rohacs Abstract: Nowadays, sustainability-related research and improving the greening in aviation has become a significant focus for future aviation developments. This introduces a new methodology developed for total impact evaluation of the vehicles and transportation systems. A method to determine all the impact i.e. environmental impact, safety and security, cost, cost benefits, and sustainability. These impacts are analyzed and evaluated on the vehicle and/or on the transportation system levels by generating the total impact index. There will be shown and discussed the results of the comparison analysis of total and specially the environmental impacts of the aircraft with different (conventional, electric and hybrid) propulsion systems. The study will take into account some differences in operational concepts, too, like range, time of using the electric engines, only, etc. Keywords: Total impact assessment; small hybrid aircraft; different propulsion systems; environmental impact; sustainability.
A STUDY OF FLIGHT OPERATIONAL CHALLENGES ENCOUNTERED BY GENERAL AVIATION INDUSTRY IN CHINA by Devinder Yadav, Maryil Goriet Abstract: General aviation industry is important in promoting national and global economy. However, in China the industry is still underdeveloped, but it has a huge potential for growth. This paper outlines a research framework for a qualitative survey to identify various issues and difficulties encountered in development and operations of general aviation industry in China. A study for technical development of general aviation (GA) industry in Liaoning province of China has been carried out after performing a focused group survey and field data collection in order to analyze issues affecting GA industry in China. Primarily, it has been observed that military control of airspace and lack of qualified aviation professionals impedes the growth of this section of the aviation industry in this country. The study primarily clarifies GA situation in China and factors affecting growth of the industry are examined. It also proposes a possibility of developing in-house aircraft maintenance facilities to promote growth of the industry in regional areas of the country. Keywords: Airspace; aviation; aircraft; engineering; flight; maintenance.
Business Process Risk Management at Aviation University to support sustainable strategy: developing a framework for ESTU ATO with integration Document Analysis, Descriptive Analysis and Flow Chart by AYSE YILMAZ Abstract: All processes in the aviation sector have significant difficulties to manage risks. Aviation universities training process design and sustainability management of the designed process. Process risk management is not a one-time project. Sustainability and continuous improvement are a vital part of sustainable process management. The aim of process risk management is to ensure that the processes work effectively and efficiently. The process cannot be effective and efficient without the adoption, commitment, decision and resource allocation of an organization by executive management.
This research presents developed framework models for both the business and training process used in aviation universities. Presented conceptual models aim is to create "common" handbook model in accordance with the regulations and requirements of the flight training. These models are developed as able to be adapted for process which is in any aviation universities and their flight training departments. As research methodology of this research both descriptive analysis, flow chart and document analysis to develop both business and flight training conceptual models. Aviation process has solid, complex and controlled structure. Aviation is also a special area surrounded by laws and regulations. To sustainable management, organizations should have a systematic and holistic approach for managing their process risk. Eskisehir Technical University Faculty of Aeronautics&Astronautics is leading Flight Training Department as first organization in Turkey. Presented model have been developed to case of ESTU ATO. This case important to show the applicability of developed framework model. Training handbook model is developed for Cessna 172 series in ESTU ATO fleet. Cessna series is most used aircraft type of flight training in worldwide. This research will useful for both managers and aviation authorities who want to both improve and maintain their process in sustainable quality.
Keywords: Aviation University; Business Process Risk Management; Flight Training; Approved Training Organization; Document Analysis; Descriptive Analysis; Conceptual Framework Model; Flow Chart; Risk Management; Aviation Management; R & D; Sustainability Management.
Conceptual design method adapted to electric/hybrid aircraft developments by Joszef Rohacs, Daniel Rohacs Abstract: Developing the more electric, hybrid and full electric aircraft became to the most important tasks. The available emerging technology (because the battery low specific energy) has not allowed yet to develop a full electric aircraft with performance similar to existing conventional ones. This paper deals with an improved conceptual design method of the electric / hybrid aircraft developments. Keywords: electric and hybrid aircraft; conceptual design; battery technology; barriers; problem of battery technology; electric aircraft developments.
What Factors Predict a Consumers Support of Environmental Sustainability in Aviation? A Multi-Model Analysis
by Scott Winter, Jennifer Thropp, Stephen Rice Abstract: Environmental sustainability remains a focal point of current research in the aviation industry. The purpose of the current study was to create four statistical models which could predict the types of factors that would indicate a consumers support for the use of sustainable products in the aviation industry. Four models were proposed: overall support for sustainability in aviation, support for the use of aviation biofuels, support of sustainable construction materials in aviation, and support of sustainable aviation manufacturing. The study used an overall sample of 514 participants who were randomly divided into two separate datasets. The first dataset was used to produce the regression equations and the second dataset was used to assess model fit. The results produced four valid models with the amount of variance explained ranging from 29.0% to 41.1%. Perceived value of sustainability was found to be a significant predictor in all four models. Keywords: sustainability; aviation; prediction; regression; statistical models; environmental commitment; green manufacturing; biofuels; green airports; consumer perceptions.
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 five categories (three shaft turbofan engine, light weight two shaft turbofan engine, medium weight two shaft turbofan engine, high weight two shaft turbofan engine and two 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. DOI: 10.1504/IJSA.2019.10023174
Electric VTOL aircraft: the future of urban air mobility (background, advantages and challenges) by Darli Rodrigues Vieira, Dreyfus Silva, Alencar Bravo Abstract: This article discusses eVTOL (electric vertical takeoff and landing) aircraft technology. The groundbreaking eVTOL technology has become a major focus of urban air mobility solutions and promises to become a reality in the near future, as it offers several advantages over conventional helicopters. As of the writing of this paper, several aeronautical companies are competing to bring the first eVTOL aircraft into commercial operation. However, there are large challenges to overcome, ranging from battery technology to certification regulations. This paper discusses the major designs currently under development, their advantages and handicaps, and the challenges posed by civil certification. Keywords: aviation; electric propulsion; eVTOL; urban air mobility; air taxi; sustainable; certification. DOI: 10.1504/IJSA.2019.10023187
A sustainable method for scheduling maintenance services of an airline with the aims of minimising awaiting times and maximising flights performance by Aidin Delgoshaei, Fateme Naserbakht Abstract: In this research, an efficient multi-objective hybrid method is proposed for scheduling maintenance services of an airline in order to reduce maintenance and repair costs and the work cycle of the aircraft simultaneously. The method is developed based on real conditions in repair shops of international airlines. Schedule aircraft according to their preventive plans and flight tables in order to reduce the awaiting times in the main repair shops of the airline. The method can also rent aircraft from other airlines when necessary and allows alien airplanes to use repair shop services to utilise performance of the repair shop. Several case studies using real number of aircraft in the airlines are solved to evaluate the performance of the proposed method. The results showed the proposed method can schedule maintenance services of large scale airplanes and decrease the multi-objective functions up to 48% in the solved case studies. Keywords: aviation; maintenance planning; flight scheduling; multi-objective decision making; awaiting time. DOI: 10.1504/IJSA.2019.10023188
The life cycle assessment related to insulation thickness of external walls of the airport by Okan Kon, Ismail Caner Abstract: In this study, energy savings to be gained by the insulation of the external walls of airport buildings are examined according to Turkish Building Insulation Standard (TS 825) which is renewed in December 2013. In addition, life cycle total (LCT) cost and life cycle savings (LCS) are calculated. Unlike the residences, the airport buildings indoor temperatures should be 20°C during the heating period according. The optimum insulation thickness was determined for the external walls of the airport buildings. The degree-of-day method is used in calculations. Optimum insulation thickness is the lowest polyurethane insulation material in the highest glass wool insulation material. The optimum insulation thickness is calculated as 0.044-0.090 m for the polyurethane insulation material and 0.122-0.233 m for the glass wool insulation material. Also, extruded polystyrene (XPS) insulation material was found between 0.062-0.125 m. Keywords: life cycle assessment; LCA; TS 825; insulation; energy saving. DOI: 10.1504/IJSA.2019.10023158