Wyniki wyszukiwania - Biblioteka Nauki

1

Modeling a negotiation process between aircraft using petri nets

100%

Żuchowska D. , Stelmach A.

|

2023

|

tom z. 121

267--285

EN

New air traffic control ideas are sought. Many studies point out the delegation of the responsibility for ensuring separation from air traffic controllers to the aircraft crews, but it should be assumed that the transition from centralized to decentralized air traffic control will occur in stages. It is, therefore, necessary to ensure effective communication between conflicting aircraft and to define the negotiation process between aircraft. The concept of the process of negotiation and communication between aircraft in conflict using a monotonic concession protocol is presented. The proposed solution was modeled using a Petri Net, which allowed us to analyze all the dependencies present in the system. The analysis allowed us to evaluate the method in the context of safety. The conducted research showed that, under the assumed conditions, the negotiation method allows obtaining the desired effect of negotiations while maintaining an adequate level of safety.

2

PHYSICAL ACTIVITY OF PRIMARY SCHOOL STUDENTS

80%

Zdzienicka – Chyła A. , Stelmach A. , Pasiak W.

|

nr 9

13-18

XX

A significant decrease in physical activity and a growing incidence of obesity are becoming problems of contemporary times, the economic and social costs of which we are bound to face. The systemic actions undertaken are aimed at creating space for physical activity and shaping health-oriented attitudes among children and young people. Promotion of health-oriented attitudes among children is one of the ways of preventing illnesses associated with lifestyle, and are also a significant factor influencing the condition of society and future generations. This study forms a preliminary evaluation of attitudes among primary school students in Lublin towards physical activity – its preferred forms and frequency. Moreover, the study presents a preliminary and general analysis of pain within the locomotor system in children. A survey in the form of a questionnaire was conducted in a primary school in Lublin among children at various stages of education. The questionnaire contained data about the children’s age and gender. Other questions concerned preferred forms of physical activity, its frequency and attitudes of schoolchildren to physical activity. The results obtained indicate that the majority (99%) of the children definitely like to undertake physical activity in various forms and they regard it as fun and an interesting way of spending free time. A significant share (51%) of the respondents reply that they undertake physical activity every day (apart from activities organized at school). However, the number of affirmative answers to the question about pain is worrying. The results obtained demonstrate quite a high level of physical activity among schoolchildren. However, the alarming results concerning incidences of pain (47%) point to the need for further indepth research on this area.

3

Selection of signal registration points in the monitoring process and diagnosing the condition of the rail vehicle

80%

Chudzikiewicz A. , Stelmach A. , Wawrzyński W.

Journal of Civil Engineering and Transport

|

2019

|

tom Vol. 1

7--13

EN

The article discusses the process of selecting points on a rail vehicle in which sensors recording signals will be located, with a view to their later use in the process of monitoring the condition of the vehicle and in particular elements of the first and second degree suspension system. The number of such points and their location is significant considering the complexity of the monitoring system and thus the costs of its construction and subsequent operation, as well as the possibility of using registered signals in the process of diagnosing the technical condition of the vehicle, bearing in mind the functioning of such a system in online mode.

PL

W artykule omówiony został proces wyboru punktów na pojeździe szynowym, w których ulokowane będą czujniki rejestrujące sygnały, mając na uwadze późniejsze ich wykorzystanie w procesie monitorowanie stanu pojazdu a w szczególności elementów układu podatnego I i II stopnia usprężynowania. Liczba takich punktów oraz ich rozmieszczenie ma istotne znaczenie biorąc pod uwagę złożoność systemu monitorowania a tym samym koszty jego budowy i późniejszej eksploatacji a także możliwość wykorzystania zarejestrowanych sygnałów w procesie diagnozowania stanu technicznego pojazdu mając na uwadze funkcjonowanie takiego systemu w trybie on-line.

4

Modeling and simulation of a control system of wheels of wheelset

71%

Chudzikiewicz A. , Gerlici J. , Sowińska M. , Stelmach A. , Wawrzyński W.

|

tom Vol. 55, iss. 3

73--83

EN

Modern light rail vehicles, such as a tram or rail bus, due to the need to provide mobility for the elderly or disabled people and the requirements of operators operating passenger rail transport or transport in urban areas must have a 100% low floor. Structurally, this is associated with the use of wheelset with independently rotating wheels (IRW) in such vehicles. It is also possible to use a bogie structure without the use of a wheelset axle by mounting the wheels directly in the side parts of the bogie frame. This construction is more complex and will not be discussed in this article. Bearing in mind the dynamic behavior of such vehicles during operation (lateral stability, profile wear) in various driving conditions (curve traffic, crossovers) and taking into account operating costs, it becomes necessary to install wheel rotation control systems to maintain center movement mass of the wheelset around the centerline of the track. The subject of the article will be considerations on modeling and simulation of rail vehicle bogie motion with IRW sets including the wheel control system. Nominal and mathematical models of the analyzed vehicle will be presented, as well as a controlled strategy based on the comparison of the angular velocities of the wheels of the wheelset A review of works on solutions of such systems will be presented, and a control concept will be proposed. The summary contains conclusions regarding the possibility of practical use of the proposed method of steering wheels of a wheelset in the case of independently rotating wheels.

5

THE INFLUENCE OF SELECTED FACTORS ON OXYGEN EFFICIENCY

61%

Pasiak W. , Stelmach A. , Pasiak P. , Weber D. , Bańbuła M. , Zubliewicz T.

|

nr 11

51-60

EN

Oxygen (aerobic) efficiency is one of the most important determinants of our physical ability, which in turn is the most significant aspect of the human body. Physical activity is very often connected with health and life long health care. The purpose of this article is to show how aerobic efficiency is affected by different lifestyles and predilections among groups selected by the researcher. This will enable the determination of those factors that influence oxygen efficiency. Purpose. The purpose of this research is to establish how aerobic efficiency, being the most important determinant of physical activity, presents in the chosen groups of respondents and how it is affected by various factors. Materials and methods. 30 respondents between the ages of 18 and 24 who study or work took part in the research. All of them claimed to pursue regular physical activity. Based on the interview with the respondents several subgroups were indicated: males, females, smokers, non-smokers, consumers of alcohol and non-drinkers.Results. Research conducted for the purpose of this manuscript enabled the evaluation of how oxygen efficiency presented in the different groups selected for the purpose of this study. Respondents who took part in the research varied based on gender and use of stimulants: Cigarettes reduce the Fitness Index (FI) rate. Males have a better FI rate than females. Alcohol does not reduce the FI rate. Those who smoke cigarettes have a lower oxygen efficiency rate then those drinking alcohol.