Improvements in reliability, safety, and operational efficiency of aeroengines can be brought in a cost-effective way using advanced control concepts, thus requiring only software updates of their digital control systems. The article presents a comprehensive approach in modular control system design suitable for small gas turbine engines. The control system is based on the methodology of situational control; this means control of the engine under all operational situations including atypical ones, also integrating a diagnostic system, which is usually a separate module. The resulting concept has been evaluated in real-world laboratory conditions using a unique design of small turbojet engine iSTC-21v as well as a state-of-the-art small turbojet engine TJ-100. Our results show that such advanced control system can bring operational quality of an engine with old turbocompressor core iSTC-21v on par with state-of-the-art engines. Dedicated to the memory of Ladislav Madarász

The purpose of this paper is to develop an applied fuzzy model of information technology to obtain quantitative estimates of environmental start-up projects in air transport. The developed model will become a useful tool for venture funds, business angels, or crowdfunding platforms for the development of innovative air transport businesses. Obtaining a quantitative estimate of the environmental start-up projects will increase the sustainability of the decision making on the security of financing of such projects by investors. This article develops a fuzzy evaluation model of project start-ups in air transport as an application of our neuro-fuzzy model in a specific air transport environment. The applied model provides output ranking of start-up project teams in air transport based on a four-layer neuro-fuzzy network. The presented model declares the possibilities of the application to solve these economic problems and offers the space for subsequent research focused on its usability in several areas of start-up development, in sectors and processes differentiated. The benefits are also visible for several types of policies, with an emphasis on decision-making processes in regulatory mechanisms to support the state funding in Slovakia, the EU etc.

The purpose of this paper is to develop a fuzzy model of the risk assessment for environmental start-up projects in the air transport sector at the stage of business expansion. The model developed for the following software will be a useful tool for the risk decision support system of investment funds in financing environmental start-up projects at the stage of market conquest. Developing a quantitative risk assessment for environmental start-up projects for the air transport sector will increase the resilience of making risk decisions about their financing by the investors. In this paper, a set of 21 criteria for assessing the risk of launching environmental start-up projects in the air transport sector were formulated for the first time by presenting inputs in the form of a linguistic risk assessment and the number of credible expert considerations. The fuzzy risk assessment model, based on expert knowledge, uses linguistic variables, reveals the uncertainty of the input data, and displays a risk assessment with linguistic interpretation. The result of the paper is a fuzzy model that is embedded in a generalized algorithm and tested in an example risk assessment of environmental start-up projects in the air transport sector.

Small turbojet engines represent a special class of All these aims comply and put emphasis mostly on safety turbine driven engines. They are suitable for scientific issues of turbo-jet engines. Other special feature resulting purposes and research of certain thermodynamic processes from our third aim is direct use of old obsolete small ongoing in turbojet engines. Moreover such engines can be used for research in the area of alternative fuels and new turbojet engines as sources of energy with use of cheap methods of digital control and measurement. Our research, alternative fuels. We have to take in consideration that which is also presented in this article, is headed toward these there exist a huge number of such small turbojet engines in aims. We evaluate and propose a system of digital old aircraft that are in non flying condition. Such engines measurement of a particular small turbojet engine -MPM can be refurbished and used again for other purposes. All 20. Such engine can be considered as highly non-linear large knowledge obtained by experiments with such engine can scale system. According to obtained data and experiments we be expanded to higher levels and certain principles may be propose situational model and situational control algorithms used for design of particular algorithms of control that for the engine with use of certain methods of artificial could also be used in normal class turbojet engines. intelligence as new methods of control of large scale systems. II SITUATIONAL CONTROL OF LARGE SCALE SYSTEMS I INTRODUCTION Situational control was designed for the control of complex Present state of technological development and growing systems, where the traditional cybernetic models weren't complexity of systems offers many challenges and also sufficient [8]. Model proposed in [8] wasn't sufficient to opportunities to achieve better results. In the area of jet control systems characterized by features like unique,propulsion, terms like safety, economic profitability and at dynamics, incompleteness and indete.minacy of the same time high efficiency come into foreground. The description, ambiguity and presence of a free will. For traditional systems of control are becoming obsolete anda systems, where it is difficult to describe their specific traditional systems of control are becoming obsolete and a structure and behavior and where the presence of a human with the need to satisfy the mentioned terms it is needed to factor has an unforeseeable character and also where the incorporate the newest technologies of control even for use system is developing by itself in time, methods of in older systems to bring them up to nowadays standards. It situational control have been developed [7] More general wouldn't be economically favorable to test such approach to situational control is formatter control of technologies within expensive and also very complex big complexes [1] Formatter control of a complex means not turbojet engines also with regard to safety of such testing. only the control of its parameters, ...

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