Eyyüp Öksüztepe, Ufuk Kaya and Hasan Kurum
More electric aircraft (MEA) is defined as the extensive usage of electric power in aircraft. The demand for electric power in new generation aircraft rises due to environmental…
Abstract
Purpose
More electric aircraft (MEA) is defined as the extensive usage of electric power in aircraft. The demand for electric power in new generation aircraft rises due to environmental and economic considerations. Hence, efficient and reliable starter/generators (SGs) are trending nowadays. The conventional main engine starting system and power generation system can be replaced with an individual SG. The constraints of the SG should be investigated to handle the aviation requirements. Even though the SG is basically an electric machine, it requires a multidisciplinary study consisting of electromagnetic, thermal and mechanical works to cope with aviation demands. This study aims to review conventional and new-generation aircraft SGs from the perspective of electric drive applications.
Design/methodology/approach
First of all, the importance of the MEA concept has been briefly explained. Also, the historical development and the need for higher electrical power in aircraft have been indicated quantitatively. Considering aviation requirements, the candidate electrical machines for aircraft SG have been determined by the method of scoring. Those machines are compared over 14 criteria, and the most predominant of them are specified as efficiency, power density, rotor thermal tolerance, high-speed capability and machine complexity. The features of the most suitable electrical machine are pointed out with data gathered from empirical studies. Finally, the trending technologies related to efficient SG design have been explained with numeric datasets.
Findings
The induction motor, switched reluctance motor and permanent magnet synchronous motor (PMSM) are selected as the candidate machines for SGs. It has been seen that the PMSM is the most preferable machine type due to its efficient operation in a wide range of constant power and speed. It is computationally proven that the using amorphous magnetic alloys in SG cores increases the machine efficiency more. Also, the benefits of high voltage direct current (HVDC) use in aircraft have been explained by a comparison of different aircraft power generation standards. It is concluded that the HVDC use in aircraft decreases total cable weight and increases aircraft operation efficiency. The thermal and mechanical tolerance of the SG is also vital. It has been stated that the liquid cooling techniques are suitable for SGs.
Originality/value
The demand for electrical power in new generation aircraft is increasing. The SG can be used effectively and efficiently instead of conventional systems. To define requirements, constraints and suggestions, this study investigates the SGs from the perspective of electric drive applications.
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Cities and the tourism industry are closely related. Cities are destinations that serve for the welfare of the people and the tourists visiting the city. The tourism sector, on…
Abstract
Cities and the tourism industry are closely related. Cities are destinations that serve for the welfare of the people and the tourists visiting the city. The tourism sector, on the other hand, uses the environmental and sociocultural resources of the cities, ensures that these resources are transferred to the future by protecting them, and contributes to the economic development of the cities by creating employment. Several urban models have been created within this framework to make urban tourism viable. Eco-city tourism is one of these urban design concepts. Eco-city tourism aims to protect cities from sociocultural, economic, and environmental factors while promoting their growth. Eco-city tourism, which includes a number of practices such as prevention of pollution, protection of biological diversity, consumption of renewable energy, production of local products, employment, and protection of cultural values, is easily implement in cities in an integrated manner with smart technological systems. Smart building and smart energy systems for energy saving, mobile applications, Wi-Fi, big data, Internet of Things (IoT), and cloud computing are among the smart technological systems used in the tourism sector.
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Ekrem Tatoglu and Mehmet Demirbag
The purpose of this paper is to consider the transformation experience of contemporary Turkey, and to provide an introduction to the special issue and a review of the papers in…
Abstract
Purpose
The purpose of this paper is to consider the transformation experience of contemporary Turkey, and to provide an introduction to the special issue and a review of the papers in the JMD special issue.
Design/methodology/approach
The paper portrays changes in Turkish business and management practices in recent years.
Findings
The paper argues that given the dynamic nature of Turkish economy, change is not an option but a required path for transformation and survival. Turbulence and anxieties, sometimes inevitably, distract or at best re‐orient the speed of change and transition.
Originality/value
The paper stimulates further work by management scholars to develop new perspectives and research agenda that will advance knowledge of the business and management practices in emerging countries.
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Zahir Irani, Muhammad Kamal, Cengiz Kahraman, Basar Oztaysi and Ozgur Kabak and Irem Ucal Sari