International Journal of Sustainable Aviation (8 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.
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 Kucuk Yilmaz
Abstract: Sustainability and continuous improvement are a vital part of sustainable process management. Process risk management is not a one-time application as ad-hoc style. Which aims to ensure optimisation of process. All processes in the aviation sector have significant difficulties to manage risks. Aviation universities training process design and sustainability management of the designed process. The process cannot give optimum results without both the adoption, commitment, decision and resource allocation by management. This research presents developed framework models. Integration of both descriptive analysis, flow chart and document analysis has been used as research methodology. Presented models aims to be common handbook for both operation and training models in accordance with the aviation regulations and requirements. These models designed as able to be adapted for process which is in flight training departments of any aviation university. This research will useful for both improve and maintain flight operation and training process with sustainable quality.
Keywords: Aviation University; business process risk management; flight training; Approved Training Organization; ATO; document analysis; descriptive analysis; conceptual framework model; flow chart; risk management; aviation management; R&D; sustainability management.
A Brief Review On Computer System Control using Multiagent Technique
by Fahad Ali, Ayesha Iqbal, Zunaira Nazir, Usman Inayat, Syed Mohsin Ali, M. Rehan Saleem
Abstract: The Multiagent system technology comprises of a number of agents that exist commonly for sharing same resources and to communicate with each other. These are self-controlled, operate in a network environment and commonly used by control engineers to control specific communication and computing channels using a number of strategies. At large scale, multiagent systems are being used in smart grids communication and sensor-controlling applications. A distributed environment is needed for the operations of multiagent systems which show their autonomous nature. This feature makes multiagent different from all other commination systems. As the size of a network is increased the control can be easy without facing the complexities of sensors and communication control. For this purpose, a communication network is important among all neighboring agents. This paper reviews previous studies on controlling of multiagents in a different frame work. It will help us to remove gaps between previous research and our latest understanding of multiagent systems technology.
Keywords: autonomous systems; communication channels; computing channels; distributed operation; multiagent systems; network control; network services; intelligent controlling; self control.
Thermoelectric Generators Simulation in Aircraft Applications
by Tareq AL-Ma'aiteh, Oliver Krammer
Abstract: This paper presents the establishment of a numerical model for investigating thermoelectric generators (TEG) in aircraft applications. A single TEG module was analysed, by calculating the unit main electrical characteristics. The thermoelectric generator consists of 24 cells with p-type and n-type legs with a different Seebeck coefficient based on silicon alloy semiconductor material. Uniform mesh was applied to the module geometry, and variable resistive load were connected to the module in order to simulate the actual operation of unit. The model provided the output parameters of power, voltage and current at different load values. The single module FEM calculation was validated by comparing voltage-current and power-voltage characteristics to them in the manufacturers data sheet. The average error in the numerical model voltage-current characteristic values was found 4.42%, and the error in numerical model power-voltage characteristics at the maximum power is 10.2%. The model allowed the optimisation of TEG modules in real devices, which can be used in the applications of energy recovery and energy harvesting in aircrafts.
Keywords: Seebeck effect; thermal electric generation; finite element modelling; silicon alloy semiconductor; energy harvesting.
METHODS FOR ASSESSMENT OF NOx EMISSIONS FROM AIRCRAFT ENGINE
by Kateryna Synylo, Nicolas Duchene
Abstract: The emission inventory of aircraft emissions are usually calculated on the basis of certificated emission indexes, which are provided by the engine manufacturers and reported in the database of the International Civil Aviation Organization. Under real circumstances, however, operational conditions may vary from ICAO definition, consequently deviations from the certificated emission indices may occur. The advanced emission model of turbofan engine (TURBOGAS emission model) was developed for the assessment of aircraft engine emissions taking into account the influences of operational and meteorological conditions on emission indexes to generate precise aircraft emissions inventories as well as contrails likelihood and lifetime. Both BFFM2 and P3T3 methods have been implemented in the TURBOGAS emission model. Determination of emission indexes under real operational and meteorological conditions is actual task, as input data for models and high accurate assessment of aircraft emissions contribution to total air pollution in the vicinity of airport.
Keywords: aircraft engine; environment; turbofan engine; air pollution; emission model; emission indices.
A comparison of crash investigation of two aircraft, one with flight data recorder (FDR) and cockpit voice recorder (CVR) and the other, without them
by Hatice Arzu Inan, Hüseyin TOPAL
Abstract: In a process of continuous improvement of reducing the rates of aircraft crashes, we must examine each crash so that we will become able to take measures to prevent such accidents from happening again in the future under the same conditions. This paper uses two different crashes as case studies. This study also includes a discussion of the necessity of the FDR and CVR equipment for determining causal factors of the crashes. The major focal points in the course of following the investigative strategies of these two crashes are furnished herein, and the comparison of these crashes give us very important insights. The most important consequence obtained in this study is, therefore, a need for emphasizing the learning process from each crash and the emphasis on the implementation of deduced recommendations.
Keywords: Crash prevention; Crash cause; Flight Data Recorder; Cockpit Voice Recorder; Flight safety.
Comparative Analysis in Terms of Environmental Impact Assessment between Railway and Air Passenger Transport Operation: a Case Study
by Vladislav Zitricky, Vladimír Lupták, Ondrej Stopka, Mária Stopková
Abstract: Currently, the environmental impact of transport represents serious problem, especially in regard to the energy consumption and production of emission gases causing global warming. This research study deals with the individual comparative calculations regarding the greenhouse gases production among selected transport modes. Particularly, railway passenger transport and air passenger transport are taken into account. First two chapters include the relevant concepts and approach methodology details in terms of greenhouse gases emissions and energy consumption calculations. Subsequent, the most important, chapters consist of processing the certain case study in a given topic in order to calculate the environmental loading of railway passenger and air passenger transport, obtained results evaluation as well as related discussion.
Keywords: railway transport; air transport; energy consumption; EN 16258:2012; greenhouse gases emissions.
Examining the Factors Affecting Safety Culture in Approved Training Organizations
by Batuhan BALLI, Ugur OZDEMIR
Abstract: Safety culture has a great influence on the success of an organization. Considering pilots as the last point in the prevention of accidents or incidents in the aviation industry shows the importance of pilots' point of view on safety. In this study, Approved Training Organizations (ATOs), which are the fundamentals of aviation, and the factors affecting safety culture are examined, and the perspectives on safety culture and its components in ATOs are evaluated. Commercial Aviation Safety Survey is used to evaluate the understanding of safety. Out of 26 ATOs in Turkey, only 5 participated and total of 104 pilot candidates and pilot trainers volunteered to answer the questionnaire. Factors presented in the revised version of CASS is verified by exploratory factor analysis. Results show that some areas of safety culture in ATOs differ from Safety Management Systems (SMS) desired outcomes. Recommendations are given to uphold the requirements regarding safety culture.
Keywords: Flight Training; CASS; Safety Culture; Reporting Culture.