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Wyszukujesz frazę "turbo" wg kryterium: Temat


Tytuł:
A trial to improve fuel-efficiency rates of a turbo-charged engine
Autorzy:
Mysłowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/243654.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
engine
supercharging
turbo-compound
Opis:
The paper discusses theoretical bases and examples of practical application of the turbo-compound supercharging. The turbo-compound engines had been supposed to be used for propelling of buses, where it turned out that they were not fully meeting the expectations. This in particular applies to Volvo, where an axial-flow turbine was used as a power turbine. Such solution was given up in the construction of turbochargers for vehicles long time ago, for the benefit of turbines with radial flow (centripetal) due to much better dynamic rates of turbochargers with centripetal turbine and with centrifugal compressor. The solution with such turbocharger combined with the power axial-flow turbine impairs follow-up of the engine-turbocharger-power turbine set and hence the departure from such type of solution. As mentioned by the authors of the Volvo solution, it is much more suitable for aircraft engines (jet turbine engines) that operate at the maximum speed all the time, which is the most advantageous due to the efficiency of rotor machines. Application of the radial-flow turbine as a power turbine - as it is the case in the Scania engines -is much more advantageous solution. Results of simulation and operational tests of engines with such type of supercharging have been presented. A method of proceeding at determination of the engine operational parameters by means of simulation calculations has been described.
Źródło:
Journal of KONES; 2008, 15, 3; 375-380
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approximation of the offset curves in the formation of turbo roundabouts
Aproksymacja krzywych offsetowych w kształtowaniu rond turbinowych
Autorzy:
Borowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/118957.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Geometrii i Grafiki Inżynierskiej
Tematy:
spiral of Archimedes
offset curve
turbo roundabout
spirala Archimedesa
krzywa offset
rondo turbo
Opis:
W pracy przedstawione są rezultaty analizy numerycznej dla problemu aproksymacji krzywej offsetowej off(c(t); s) spirali Archimedesa c(t) (o odległości s) przez inną spiralę Archimedesa c1(t). Szczególnie rozważane były te spirale, które mogą posłużyć do kształtowania rond turbinowych. Artykuł zawiera matematyczne fakty i wyniki obliczeń pomocne w projektowaniu rond turbinowych kształtowanych za pomocą spirali Archimedesa.
This article describes the results of numerical analysis of the following problem: the approximation of the offset curve off(c(t); s) of the Archimedean spiral c(t) at distance s by the other Archimedean spiral c1(t). We focus on the spirals which can be used to shape the turbo roundabouts. The paper contains mathematical facts which are helpful in designing the turbo roundabouts formed by means of the Archimedean spiral.
Źródło:
Journal Biuletyn of Polish Society for Geometry and Engineering Graphics; 2018, 31; 53-60
1644-9363
Pojawia się w:
Journal Biuletyn of Polish Society for Geometry and Engineering Graphics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The road safety at turbo roundabouts in Poland
Autorzy:
Macioszek, E.
Powiązania:
https://bibliotekanauki.pl/articles/223668.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
turbo roundabouts
road safety
traffic engineering
rondo turbo
bezpieczeństwo ruchu drogowego
inżynieria ruchu
Opis:
There are to two groups of turbo roundabouts used currently in Poland. The first group is turbo roundabouts with geometry and traffic organization designed following the model of Dutch turbo roundabouts with raised lane dividers. The other group is turbo roundabouts with traffic organization which entirely or partly corresponds to traffic organization of conventional turbo roundabouts, but with lane dividers not present, with their function performed by a single continuous line of P-2 type. Turbo roundabouts in the world are considered as solutions which are characterized by a high level of road safety and allow for effective flow at substantial traffic intensities. The data about turbo roundabouts in Poland analysed by the author show that there are substantially more turbo roundabouts without raised lane dividers. The paper attempts to answer to the question of whether turbo roundabouts with lane dividers in the form of a single continuous line ensure the appropriate level of road safety. Furthermore, the comparison of the level of road safety in turbo roundabouts equipped in raised lane dividers with turbo roundabouts with lane separators in the form of continuous line revealed that turbo roundabouts with raised lane dividers are safer solutions than turbo roundabouts with traffic lane dividers in the form of continuous line.
Źródło:
Archives of Transport; 2015, 33, 1; 57-67
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approximation of the ellipse offset curves in turbo roundabouts design
Aproksymacja krzywych offsetowych elipsy w projektowaniu rond turbinowych
Autorzy:
Borowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/119077.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Geometrii i Grafiki Inżynierskiej
Tematy:
ellipse offset curve
accuracy of delineating
turbo roundabout
krzywa offsetowa elipsy
dokładność wyznaczania
rondo turbo
Opis:
Eliptyczne ronda turbinowe są bardziej bezpieczną i efektywniejszą alternatywą dla standardowych rond wielopasmowych. W pracy przedstawiono wyniki analizy numerycznej dla problemu aproksymacji krzywych offsetowych off(el(a, b); s) danej elipsy el(a, b) o odległości s przez elipsę el(a-s, b-s) oraz el(a+s, b+s). Rozważamy elipsy, które mogą posłużyć do kształtowania rond turbinowych. Przetestowano, dla których wartości parametrów s (szerokość pasa ruchu) i e (mimośród) maksymalne odchylenie krzywej offsetowej elipsy od elipsy el1 (el2) nie przekracza dokładności tyczenia krzywych w terenie.
The elliptical turbo roundabouts are a safer and more effective alternative to the known multi-lane roundabouts. This paper contains the results of numerical analysis for the problem of approximation of the offset curves off(el(a, b); s) of an ellipse el(a, b) at distance s by ellipses el1(a+s, b+s) and el2(a-s, b-s). We considered the ellipses which can be used to shape the turbo roundabouts. It was tested for which parameter values s (the width of the lane) and e (eccentricity) the maximum deviation of the ellipse offset curve from the ellipse el1 (el2) does not exceed the accuracy of the delineating the curves in the terrain.
Źródło:
Journal Biuletyn of Polish Society for Geometry and Engineering Graphics; 2018, 31; 43-51
1644-9363
Pojawia się w:
Journal Biuletyn of Polish Society for Geometry and Engineering Graphics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safety evaluation of turbo roundabout considering autonomous vehicles operation
Autorzy:
Severino, Alessandro
Pappalardo, Giuseppina
Trubia, Salvatore
Powiązania:
https://bibliotekanauki.pl/articles/1853683.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rondo turbo
pomiar zastępczy
konflikt ruchu
ocena bezpieczeństwa
turbo roundabout
surrogate measure
traffic conflict
safety evaluation
Opis:
A microsimulation approach was carried out in this paper to evaluate the safety performance of turbo roundabouts in which the "CAVs" of connected autonomous vehicles are mixed with the "CVs" of conventional vehicles the research aims to evaluate the advantages in terms of safety and performance of turbo roundabouts. The paper shall also lead to describe the methodological path followed to build VISSIM models of turbo roundabout changing O_D matrix as real case applications, to calibrate the simulation models, and to estimate the potential conflicts when the percentages of CAVs are introduced into the traffic mix. The results, in accordance with the existing bibliography, have shown that the safety levels and the parameters that determine an improvement in the service level in a turbo roundabouts are significantly influenced not only by the geometric characteristics, but also by the distribution of vehicular flows. Therefore, it follows that in absence of crash data including CAVs, the surrogate measures of safety must be considered a strong approach to evaluate the safety performance of a roundabout so far, any road entity.
Źródło:
Archives of Civil Engineering; 2021, 67, 1; 439-460
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PZL-10 turboshaft engine : system design review
Autorzy:
Czarnecki, Michał
Olsen, John
Ma, Ruixian
Powiązania:
https://bibliotekanauki.pl/articles/245142.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
gas turbine
design
topology
turbo shaft
performance
Opis:
The PZL – 10-turboshaft gas turbine engine is straight derivative of GTD-10 turboshaft design by OKMB (Omsk Engine Design Bureau). Prototype engine first run take place in 1968. Selected engine is interested platform to modify due gas generator layout 6A+R-2, which is modern. For example axial compressor design from successful Klimov designs TB2-117 (10A-2-2) or TB3-117 (12A-2-2) become obsolete in favour to TB7-117B (5A+R-2-2). In comparison to competitive engines: Klimov TB3-117 (1974 – Mi-14/17/24), General Electric T-700 (1970 – UH60/AH64), Turbomeca Makila (1976 – H225M) the PZL-10 engine design is limited by asymmetric power turbine design layout. This layout is common to early turboshaft design such as Soloview D-25V (Mil-6 power plant). Presented article review base engine configuration (6A+R+2+1). Proposed modifications are divided into different variants in terms of design complexity. Simplest variant is limited to increase turbine inlet temperature (TIT) by safe margin. Advanced configuration replace engine layout to 5A+R+2-2 and increase engine compressor pressure ratio to 9.4:1. Upgraded configuration after modification offers increase of generated power by 28% and SFC reduction by 9% – validated by gas turbine performance model. Design proposal corresponds to a major trend of increasing available power for helicopter engines – Mi-8T to Mi-8MT – 46%, H225M – Makila 1A to 1A2 – 9%, Makila 1A2 to Makila 2-25%.
Źródło:
Journal of KONES; 2019, 26, 1; 23-29
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of convolutional interleavers in turbo codes with unequal error protection
Autorzy:
Vafi, S.
Wysoki, T. A.
Powiązania:
https://bibliotekanauki.pl/articles/309096.pdf
Data publikacji:
2006
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
convolutional interleavers
unequal error protection
turbo codes
Opis:
This paper deals with an application of convolutional interleavers in unequal error protection (UEP) turbo codes. The constructed convolutional interleavers act as block interleavers by inserting a number of stuff bits into the interleaver memories at the end of each data block. Based on the properties of this interleaver, three different models of UEP turbo codes are suggested. Simulation results confirm that utilizing UEP can provide better protection for important parts of each data block, while significantly decreasing the number of stuff bits.
Źródło:
Journal of Telecommunications and Information Technology; 2006, 1; 17-23
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of unequal power allocation in turbo coded multi-route multi-hop networks
Autorzy:
Wada, T.
Jamalipour, A.
Ohuchi, K.
Okada, H.
Saito, M.
Powiązania:
https://bibliotekanauki.pl/articles/309168.pdf
Data publikacji:
2006
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
multi-route transmissions
turbo codes
power allocation
Opis:
Multi-hop ad hoc networks are promising candidates for next generation mobile communications. They have sufficient channel capacity to achieve high data rate transmission for large number of users. One advantage of multi-hop networks is to realize multi-route transmissions. Since information bit streams can be transmitted over multiple routes, we can obtain route diversity effect. In order to enhance the route diversity effect, we usually introduce forward error correction schemes. Turbo coding is one of suitable coding methods for multi-hop networks. The turbo encoder generates one message stream and two parity streams whilst the message stream is more important than the parity streams for achieving reliable communications. Thus an unequal power allocation to the message and parity streams could be effective in improving the performance. In this paper, the effect of unequal power allocation for turbo coded multi-hop networks is investigated. Assuming the channel as additive white Gaussian and binary symmetric, we will show considerable performance improvement by unequal power allocation in terms of the bit error rate performance in multi-route multi-hop networks.
Źródło:
Journal of Telecommunications and Information Technology; 2006, 1; 46-53
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of traffic flow characteristics of signal controlled intersection and turbo roundabout
Autorzy:
Kalašová, Alica
Skřivánek Kubíková, Simona
Čulík, Kristián
Palúch, Ján
Powiązania:
https://bibliotekanauki.pl/articles/262877.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
traffic flow
turbo roundabout
signal controlled intersection
simulation
Opis:
In the Slovak republic, there is an increase of building roundabouts in both urban and non-build-up areas. The construction of roundabouts in urban areas brings mainly calming of traffic intensity. A roundabout in non-build-up areas could be built only within certain conditions. In this paper, we have been studying a small roundabout location and its traffic characteristics in the city of Hlohovec. In some cases, a small roundabout could be very good solution for exceeded traffic flow capacity of signal controlled intersections as well as for intersections with a high number of traffic incidents. But in our case, a small roundabout is not suitable for such intensity of vehicles as we measured in transport survey. So we focused on other possibilities how to improve this current situation. We have decided to make a proposal of signal controlled intersection as well as a turbo roundabout and compare the results of traffic characteristics of each proposal. We have made several simulations of each variant of traffic situation, using transport-planning software Aimsun, and calculate average values of all recorded traffic characteristics. As inputs, we have used intensities and other basic data obtained from transport survey. Using simulations outputs of transport planning software, we have been able to compare a current state with signal controlled intersection and turbo roundabout. Traffic characteristics of turbo roundabout show significant improvements compare to signal controlled intersection, f.e. in delay time (more than 68%), travel time (more than 22%), number of stops (more than 73%). Turbo roundabout seems to be the best solution for traffic organising at this chosen intersection in the city of Hlohovec, regarding travel time, delays, number of stops and safety at all.
Źródło:
Archiwum Motoryzacji; 2020, 88, 2; 19-36
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving spark-ignited engines efficiency by heat energy recovery system
Autorzy:
Sutkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/132997.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
heat recovery system
turbo-compound
system odzysku ciepła
Opis:
The current trends in regulations changes focus more and more on emissions reduction. Earlier environment protection mechanisms covering emissions limits of particulates, nitrogen oxides, sulphur oxides and carbon monoxide were recently extended also to cover carbon dioxide emissions. One way to reduce carbon dioxide emission is the improvement of the efficiency of a powertrain system or main driver efficiency. This paper explains main limitations for efficiency improvement when conventional methods are used. The effective heat energy recovery system principles and its technical specification are described including its control principles. System was initially tested in the engine laboratory and experience from the laboratory tests is included in the paper. After successful and promising laboratory tests the solution was transferred to commercial operation which covered already period of more than 2 years. Statistics and operational data from commercial operation is shown with relevant examples of various operational modes. At the end of the paper simple feasibility study is shown. Alternative applications with basic evaluation of their feasibility and efficiency improvement potential are included in this paper as well.
Źródło:
Combustion Engines; 2015, 54, 2; 64-67
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Capability of synchronous machines to ride through events with high ROCOF
Autorzy:
Assenkamp, Alf
Kreischer, Christian
Kulig, Stefan
Powiązania:
https://bibliotekanauki.pl/articles/140451.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ROCOF
under-excitation protection
turbo-generator
low-inertia grids
Opis:
The transition of power grids to implement large amounts of nonsynchronous renewables reduces the inertia in the power system. Therefore, the rate of change of fre- quency (ROCOF) after a fault of given energy is higher in low inertia grids than in grids with mainly synchronous machines operating. Standard faults for the design of existing synchronous machines assume fixed frequency grids, in which an electrically close fault happens. It is not tested, if the machines can ride through transient disturbances with high ROCOF. For ROCOF values of up to 1 Hz/s as foreseen for the upcoming grid code of the Republic of Ireland and up to 2 Hz/s for Northern Ireland, a thorough verification, if generators are capable to ride through such events is necessary. For this study, ROCOF frequency traces provided by the transmission system operators (TSOs) of Ireland were first benchmarked with a full-grid model and in a second step impressed on a model of generators connected to the power grid via a step-up transformer to study transient stability and nonlinear response of the generator. This paper focusses on the ability of nine different synchronous machines to stay connected to the transmission system during severe ROCOF events without losing synchronism.
Źródło:
Archives of Electrical Engineering; 2019, 68, 2; 325-339
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Full-electric, hybrid and turbo-electric technologies for future aircraft propulsion systems
Autorzy:
Łukasik, B.
Wiśniowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/243487.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
full electric
turbo-electric
hybrid systems
distributed propulsion systems
Opis:
Recently a huge progress in the field of electrical machines makes them more available for aviation. Assuming a big leap forward of electric technology in the near future, many research institutes around the World examine a revolutionary propulsion system which employs electrical machines. This idea can be a perfect response to a drastically growing air traffic and its demands about emission and fuel consumption reduction. There are already manufactured full electric, ultralight airplanes, which show that the technology is promising and future-proof. What is more it seems to be a key enabler for the development of the other technology that will influence the future of aircraft design and will allow introducing completely new airplane architectures. That is why Institute of Aviation in collaboration with The Ohio State University conducts investigation and analysis on feasibility of using such systems for aircraft propulsion. For this task a completely new tool based on Numerical Propulsion System Simulation (NPSS) environment is being developed. It will enable to analyse the electric devices conjugated with turbine engine as a whole propulsion system in the matter of its performance characteristics. The purpose of this paper is to present some of the most promising ideas and already accomplished analysis of different kinds of architectures. The analysis and optimization of the system, as well as cost effectiveness will be presented.
Źródło:
Journal of KONES; 2016, 23, 4; 305-310
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Efficient Early Iteration Termination for Turbo Decoder
Autorzy:
Salija, P.
Yamuna, B.
Powiązania:
https://bibliotekanauki.pl/articles/958052.pdf
Data publikacji:
2016
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
early termination
complexity reduction
mean of extrinsic information
turbo decoder
Opis:
Turbo code finds wide applications in mobile communication, deep space communication, satellite communication and short-range communication despite its high computational complexity and iterative nature. Realizing capacity approaching turbo code is a great achievement in the field of communication systems due to its efficient error correction capability. The high computational complexity associated with the iterative process of decoding turbo code consumes large power, introducing decoding delay, and reducing the throughput. Hence, efficient iteration control techniques are required to make the turbo code more power efficient. In this paper, a simple and efficient early iteration termination technique is introduced based on absolute value of the mean of extrinsic information at the component decoders of turbo code. The simulation results presented clearly show that the proposed method is capable of reducing the average number of iterations while maintaining performance close to that of fixed iteration termination. The significant reduction in iteration achieved by the method reduces decoding delay and complexity while maintaining Bit Error Rate performance close to standard fixed iteration turbo decoder.
Źródło:
Journal of Telecommunications and Information Technology; 2016, 2; 113-122
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of HCM 2010 in the determination of capacity of traffic lanes at turbo roundabout entries
Zastosowanie metody HCM 2010 do wyznaczania przepustowości pasów ruchu na wlotach rond turbinowych
Autorzy:
Macioszek, E.
Powiązania:
https://bibliotekanauki.pl/articles/375367.pdf
Data publikacji:
2016
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
turbo roundabout
roundabouts capacity
HCM 2010
rondo turbinowe
pojemność ronda
Opis:
The main aim of this study was to verify whether it is possible to utilize the model contained in the HCM 2010 methodology for evaluation of traffic capacity of the lanes at the entries to turbo roundabouts in Poland. The models contained in the HCM 2010 methodology were compared with the empirical values obtained for traffic capacity of the traffic lanes at the entries to turbo roundabouts with values of traffic capacity determined based on the author's own models developed based on the data collected at turbo roundabouts located in Poland. The comparison demonstrated a moderate consistency of the compared values of traffic capacity.
Głównym celem artykułu było sprawdzenie, czy możliwe jest wykorzystanie modelu zawartego w metodzie HCM 2010 do szacowania przepustowości pasów ruchu na wlotach rond turbinowych w Polsce. Modele zawarte w metodzie HCM 2010 porównywano z empirycznymi wartościami przepustowości pasów ruchu na wlotach rond turbinowych oraz z wartościami przepustowości wyznaczonymi z modeli autorskich, skonstruowanych na podstawie danych zebranych na rondach turbinowych zlokalizowanych w Polsce. Pozwoliło to na stwierdzenie umiarkowanej zgodności porównywanych wartości przepustowości.
Źródło:
Transport Problems; 2016, 11, 3; 77-89
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sum-α Stopping Criterion for Turbo Decoding
Autorzy:
Ouardi, Aissa
Powiązania:
https://bibliotekanauki.pl/articles/1844500.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stopping criterion
correct frames
sum-α criterion
cross-entropy
turbo decoding
Opis:
In this article, we propose a new stopping criterion for turbo codes. This criterion is based on the behaviour of the probabilistic values alpha 'α' calculated in the forward recursion during turbo decoding. We called this criterion Sum-α. The simulation results show that the Bit Error Rates BER are very close to those of the Cross-Entropy CE criterion with the same average number of iterations.
Źródło:
International Journal of Electronics and Telecommunications; 2021, 67, 3; 477-482
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł

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