Abstract
In the process of performing a complex of works on refueling of civil aviation aircraft, one of the key issues is to ensure flight safety by controlling the quality of aviation fuel directly during refueling operations. Currently, to ensure the purity of the refueled jet fuel, water separators with filter elements of a normalized degree of purification are installed on the aircraft refueling facilities, the operation of which in the working area provides normalized indicators of cleaning jet fuel from water and mechanical impurities. As practice shows, in the process of refueling aircraft, for various objective and subjective reasons, sometimes there are stochastic situations in which quality indicators go beyond the limits established by regulatory documentation and are not deterministic, and the subsequent state of such a system is described by values that characterize an extremely low level of jet fuel purification with negative consequences for flight safety. This paper presents a mathematical description of the functioning of water separator filters in the working area, where standardized indicators of the quality of aviation fuel are provided during the refueling of aircraft. The article deals with the issue of blocking the refueling of aircraft in the event of the appearance of non-normalized technical documentation indicators of the quality of aviation fuel, which arise due to a number of different factors that lead to negative cause-and-effect relationships for flight safety. Based on the mathematical description, an approach to creating a system for protecting and blocking the refueling process under the working name "Barrier" is proposed. Of the greatest interest for the study are typical water separator filters installed on refueling vehicles as terminal technical devices for fuel purification during refueling of aircraft.
Highlights
IntroductionThe subject of study in the present paper is the working area of the filter elements of the filter water separators as the jet fuel cleaning products, installed at refueling facilities as the terminal technical facilities adjacent to the aircraft tanks2.The purpose of the research is to develop the basics of the mathematical model of system for protecting the refueling facilities from the fuel quality indicators exceeding the working area, both by pressure drop Р, and consumption Q based on manufacturer’s technical documentation for the cleaning products.The authors have set the problem – to use the suggested mathematical description in the mathematical software of the on-board digital controller capable of blocking the refueling process while meeting the fuel quality stochastic criteria, as working fluid of jet and turbojet aircraft engines [1].The working hypothesis is accepted in the research, as a statistically distributed proposal about the difference between the mathematical fields [2] of non- and working area of filter elements, due to the standardized diff of the fuel quality indicators, divided by the aircraft refueling process blocking borders, along with the ways of solving the given problem due to the hypothetic connection of the research subject and the proposed actions.Statement of the research problem: to give the mathematical description of the working areas of terminal fuel cleaning products filter elements while functioning in the working zone as the predictive process, and as the random and unpredictive process forming the borderline of blocking the aircraft refueling process in order to distinguish them
This paper presents a mathematical description of the functioning of water separator filters in the working area, where standardized indicators of the quality of aviation fuel are provided during the refueling of aircraft
The working hypothesis is accepted in the research, as a statistically distributed proposal about the difference between the mathematical fields [2] of non- and working area of filter elements, due to the standardized diff of the fuel quality indicators, divided by the aircraft refueling process blocking
Summary
The subject of study in the present paper is the working area of the filter elements of the filter water separators as the jet fuel cleaning products, installed at refueling facilities as the terminal technical facilities adjacent to the aircraft tanks2.The purpose of the research is to develop the basics of the mathematical model of system for protecting the refueling facilities from the fuel quality indicators exceeding the working area, both by pressure drop Р, and consumption Q based on manufacturer’s technical documentation for the cleaning products.The authors have set the problem – to use the suggested mathematical description in the mathematical software of the on-board digital controller capable of blocking the refueling process while meeting the fuel quality stochastic criteria, as working fluid of jet and turbojet aircraft engines [1].The working hypothesis is accepted in the research, as a statistically distributed proposal about the difference between the mathematical fields [2] of non- and working area of filter elements, due to the standardized diff of the fuel quality indicators, divided by the aircraft refueling process blocking borders, along with the ways of solving the given problem due to the hypothetic connection of the research subject and the proposed actions.Statement of the research problem: to give the mathematical description of the working areas of terminal fuel cleaning products filter elements while functioning in the working zone as the predictive process, and as the random and unpredictive process forming the borderline of blocking the aircraft refueling process in order to distinguish them. The subject of study in the present paper is the working area of the filter elements of the filter water separators as the jet fuel cleaning products, installed at refueling facilities as the terminal technical facilities adjacent to the aircraft tanks. The working hypothesis is accepted in the research, as a statistically distributed proposal about the difference between the mathematical fields [2] of non- and working area of filter elements, due to the standardized diff of the fuel quality indicators, divided by the aircraft refueling process blocking borders, along with the ways of solving the given problem due to the hypothetic connection of the research subject and the proposed actions. Statement of the research problem: to give the mathematical description of the working areas of terminal fuel cleaning products filter elements while functioning in the working zone as the predictive process, and as the random and unpredictive process forming the borderline of blocking the aircraft refueling process in order to distinguish them. In terms of control optimization – this is the area of boundaries of derivation of the signals for the refueling process rejection
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