Wyniki wyszukiwania - BazTech

1

The challenge of mobility in Europe

Baron A., Mączka M., Piwek K.

Prace Instytutu Lotnictwa

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2010

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Nr 3 (205)

3-13

EN

This paper briefly reviews the transport networks and socio-economic indicators affecting the development of transport and shows the share of different modes of transport in passenger transport volume in Europe. Based on statistics and studies of mobility, carried out earlier in the framework of European programs, an assessment of accessibility and performance of main transport systems was made. Pointed out the need to fill the existing gap transport occurring in the range of 300 km to about 1200 km.

2

Synthesis of EPATS demand estimation

Laplace I., Chertier C., Baron A., Mączka M.

Prace Instytutu Lotnictwa

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2010

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Nr 3 (205)

67-81

EN

A mode choice model that generates on demand small aircraft travel forecasts between NUTS-2 regions connections of 28 EU countries based on interregional passengers mobility and value of time and vehicle performance characteristics is presented. The paper explains Small Aircraft Transport demand modeling at the EU mobility and airspace levels. The model is based on the assumption, that the passenger chooses the mode of transport, which minimizes their generalized cost of travel. The model has been developed under the project EPATS (European Personal Air Transportation System) funded by EU Commission. The model gives an instrument to evaluate the potential transfer of passenger demand to personal aviation by 2020 and the fleet of EPATS aircraft that would be needed to satisfy this demand. The estimations have been made first at European level and then at national level for domestic traffic of two European countries: France and Poland.

3

Polish Institute of Aviation in the European Research Area

Jeż M.

Prace Instytutu Lotnictwa

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2010

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Nr 1 (203)

1-57

EN

This booklet intends to highlight the issues of better involvement of European Union New Member States, with Poland as an example, into EU reality of aerospace sector progress. Authors try to justify the necessity of paradigm shift in the domain of European Research Area concept realization. The contents are organized in four parts dedicated consecutively to: European Communities, European aeronautics stakeholders, EREA Association conception and development and finally the Polish Institute of Aviation activity in European Research Area.

PL

To opracowanie rozświetla zagadnienia lepszego włączenia nowych członków Unii Euro - pejskiej, na przykładzie Polski, do bieżących procesów i postępu w europejskim sektorze lotniczym. Autorzy starali się uzasadnić konieczność zmian metodycznych w realizacji koncepcji Europejskiej Przestrzeni Badawczej (ERA). Celem jest ukazanie europejskim partnerom naszej orientacji i dążeń oraz pomoc polskim inżynierom w przełamaniu zwątpień i podjęciu zdeterminowanej aktywności dla odzyskania wkładu polskiego podatnika do funduszy Departamentu Badań i Innowacji Komisji Europejskiej. Zawartość tej publikacji została zorganizowana w czterech częściach poświęconych kolejno: wspólnotom europejskim, interesariuszom lotnictwa europejskiego, Stowarzyszeniu Lotniczych Instytutów Europejskich (EREA) oraz wyzwaniom Instytutu Lotnictwa wobec ERA.

4

Fenomen górnej granicy wybuchowości (GGW) paliw w powietrzu i tlenie w warunkach podwyższonego ciśnienia i temperatury

Rarata G.

Prace Instytutu Lotnictwa

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2010

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Nr 2 (204)

1-70

PL

Przedstawiona paca doświadczalna została wykonana w laboratoriach Instytutu Techniki Cieplnej PW. Artykuł zawiera wyniki serii pomiarów, których celem było ustalenie wpływu wybranych parametrów fizycznych na wartość ciśnienia wybuchu dla mieszanin gazowych alkanów z tlenem. Dane takie, łącznie z wyznaczoną wartością górnej granicy wybuchowości (GGW) dla poszczególnych mieszanin, mają podstawowe znaczenie dla ustalania odpowiednich norm bezpieczeństwa w przemyśle chemicznym. Badaniom poddano gazowe alkany, a więc metan, etan, propan oraz n-butan. Wyniki, prezentowane w postaci sumarycznych danych (tabel), zostały uzyskane w wyniku przeprowadzenia pomiarów w stalowym naczyniu kulistym o objętości 2,3 dm3. Jako źródło zapłonu użyto tzw. eksplodujący drucik (exploding wire), który uwalniał około 0,1 J energii za każdym razem. Przebieg zmian ciśnienia w czasie rejestrowano przy użyciu szybkiego czujnika piezoelektrycznego. Zbadano wpływ temperatury początkowej mieszanin testowych, w zakresie od 20°C do 200°C. Przeprowadzono również pomiary w zakresie wzrastającego ciśnienia początkowego mieszanin. Na ich podstawie autor wyznaczył wyraźne zależności GGW od początkowej wartości T oraz p badanych mieszanin.

EN

The presented research work has been done in the Institute of Heat Engineering laboratories at Warsaw University of Technology. The explosive range of chosen gases is determined by specific conditions of temperature and pressure. These values also depend on different factors, such as the shape of the explosion vessel, ignition energy or the presence of other substances which may, for instance, have catalytic properties. The obtained results relate the influence of chosen physical parameters on the value of the Upper Explosive Limit (UEL). Other research data is also presented in the paper. This was obtained from specially designed spherical explosion chamber of a volume of 2.3 dm3. Exploding wire was used as the ignition source. It released about 0.1 J energy each time. The influence of the increased initial temperatures of those mixtures on their value of UEL was also investigated in the range of 20°C up to 200°C. Further experiments on the influence of elevated conditions, as well as the position of ignition source and residence time, were carried out as well. A number of higher alkanes were examined (up to n-butane), both in air and oxygen mixtures. These experiments allowed the author to find distinct dependencies in the values of UEL under the investigation conditions. The results have been compared and validated with literature data and numerical code, according to the experimental conditions, methodology and adopted criteria of UEL determination. Some of the effects found were possible to explain only by acceptance of such phenomenon as cool flames appearing in the regions close to UEL. This seems to be particularly important when safety parameters or numerical modelling standards for UEL are sought.

5

Evaluation of the air transport efficiency definitions and their impact on the European Personal Air Transportation System Development

Rohacs J.

Prace Instytutu Lotnictwa

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2010

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Nr 3 (205)

14-32

EN

The large US SATS (Small Aircraft Transportation System and EU supported EPATS (European Personal Air Transportation System [4, 5]) projects target to develop and introduce new transportation system based on the newly designed small and smart aircraft mostly personal used in completely redesigned and rebuilt airport and ATM systems. Introduction of such innovative system can be characterized by innovation diffusion process. The diffusion of innovation is the process by which an innovation is communicated through certain channels over time among the members of social system. The penetration of the new innovative system into society and economy can be characterized by “S” curve. In case of earlier time of diffusion, when only the relatively small number of users, called innovators and early adaptors are applying the new system, the evaluation of efficiency of the new system plays a determining role. Generally, it seems the efficiency can be defined and applied for evaluation of the new technology easy. However, the efficiency means different meaning for different group of people, like designers, operators, users, owners, stakeholders, or simple “neutrals”, namely for those who does not belong no one from the named groups. So, the new system must be evaluated with use of different terms, different methods, as technical or energetic efficiency, benefits, etc. This short paper tries to summarize the different definitions of efficiency and their use for evaluating the EPATS and their impacts on the EPATS development process.