Wszystkie pola: a comparison - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A comparison of burning characteristics of iso-octane and ethanol fuels in an optical SI engine
Autorzy:: Moxey, B.
Cairns, A.
Zhao, H.
Powiązania:: https://bibliotekanauki.pl/articles/242661.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ethanol
natural light imaging
isooctane
Opis:: Over the next few decades the automotive industry will be faced with a number of challenging decisions as the world’s supply of oil reduces and the global population increases beyond 7 billion. These factors have driven some researchers to look at blending fossil fuels with alternatives such as crop-produced alcohols (or so-called biofuels). The currently reported study was concerned with the combustion characteristics of ethanol-isooctane blended fuels in a specially designed, single cylinder, spark ignition research engine equipped with full bore overhead optical access. The testing was undertaken using port fuel injection (PFI) and was focused on the behaviour of differing ethanol concentrations under varied internal exhaust gas re-circulation levels (IEGR). Simultaneous high speed imaging and in-cylinder pressure data analysis was used to understand the fundamental influence of varying ethanol content on turbulent flame propagation and subsequent mass burning. The resulting images were analysed looking at the speed of the advancing flame and the shape factor of the burning velocity. The initial evidence suggested that under the moderate speeds and loads tested, poor charge mixture preparation associated with ethanol was leading to fast but unstable burn rates. This could be avoided and combustion improved by using increased valve overlap settings, with the hot residuals entering the intake port aiding the full evaporation of the fuel.
Źródło:: Journal of KONES; 2013, 20, 2; 299-305
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Catalytic properties of hybrid alumina-Pt films produced on FeCrAl steel in a comparison test on 2-methylol-3butyn-2-ol conversion and oxidation of cyclohexane
Autorzy:: Reszka, K.
Rakoczy, J.
Lisowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/242776.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Opis:: The higher thermal resistance and the mechanical strength of the catalytic element carriers produced on metal substrates contribute to the further interest of the automotive industry on them despite that they show a smaller development of the surface compared to the ceramic carriers. The present work was focused on testing the catalytic properties of oxide films obtained as a result of the high-temperature oxidation of 0H18J5 steel foil under mixture of oxygen and argon which were coated with platinum by reactive dc magnetron sputtering. Hybrid coatings obtained by the oxidation of metal foil prior coated with aluminum nanofilms and then with platinum and the aluminum- platinum composites were also tested. The catalytic activity of the obtained coatings was tested by the pulse method in 2-methylol-3-butyn-2-ol decomposition reaction and the flow method in the process of cyclohexane oxidation. A catalytic test enabling the parameters of cyclohexane oxidation (temperature, time of reaction, cyclohexane concentration in zone of reaction) using the air to be controlled was developed for this flow method. The tests being carried out revealed an influence of different configuration of oxide films and platinum on their catalytic properties. Moreover, a high activity of alumina-Pt systems in the process of cyclohexane reheating with the air was confirmed.
Źródło:: Journal of KONES; 2007, 14, 4; 383-391
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A comparison of selected operating parameters of the diesel engine fuelled with mixtures of diesel oil or liquid bio - fuel and natural gas for low - power generators
Autorzy:: Boruta, G.
Imiołek, M.
Powiązania:: https://bibliotekanauki.pl/articles/241789.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: diesel engine
dual-fuel engine
biofuels
alternative fuels
Opis:: Following the modern fuel market, one can notice that prices of liquid petroleum derivatives - petrol and diesel oil - which most often fuel piston internal combustion engines are increasingly higher. Similarly, the price of petroleum-derivative gas (LPG - the liquefied petroleum gas - simply speaking, a mixture of propane and butane) is also growing. Many academic and industrial institutions of science conduct research to determine whether it is possible to replace liquid petroleum-derivative fuels with some other potentially cheaper ones. It would also be beneficial if these new fuels were more "ecological" - so that their combustion products would not be harmful for the environment and if they were produced with the use of plants. Fuel stations commonly offer a fuel for diesel engines which is a mixture of fatty acids methyl esters (FAMEs) from vegetable oils, in Poland for instance from rape seeds. The paper presents a comparison of selected operating parameters of the Hatz 1B40 engine fuelled with mixtures of diesel oil or liquid bio-fuel and natural gas. Indicator diagrams, exhaust gases composition and vibration signals recorded on the engine body were analyzed. The study was conducted on the Hatz 1B40 diesel engine which is used among others in FOGO power generator sets, after replacing the original feeding system by common rail system for liquid fuels and after adding natural gas feeding system.
Źródło:: Journal of KONES; 2012, 19, 4; 111-116
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Validation of reference sampling for failure detection by crankshaft angular speed analysis
Autorzy:: Dereszewski, M.
Charchalis, A.
Powiązania:: https://bibliotekanauki.pl/articles/243825.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: diagnostics
marine diesel engine
angular speed
reference comparison
Opis:: The paper presents results of the experiment focused on evaluation of records of runs of the engine in good condition as a reference for subsequent detection of faults of fuel system of medium speed diesel engine. The aim of research was determination of limits of instantaneous angular speed's spread spotted between random starts of the engine, without any fault condition simulation. Due to fine variation of the load setup and different ambient condition, every record of angular speed of independent starting, despite of attempts to sustain the same load and rotational speed value, presents some deviations between runs. Having on mind utilization of such measurement as a template for further comparison, is crucial to find out how random changes of ambient conditions and accuracy of revolutionary speed setup affect the IAS magnitude course. The answer was got in way of registration of numerous runs of the test engine after independent starts and hand adjustment of required RPM’s. The experiment was carried out at laboratory stand in GdyniaMaritimeUniversity, equipped with diesel engine Sulzer 3AL 25/30 driving electrogenerator. Sulzer 3AL 25/30 is three cylinder, medium speed, four stroke marine diesel engine, with maximum output 400 kW at 750 rpm. Independent records were treated as random variable and were compared each other. Obtained results were compared with differences between healthy engine and with simulated malfunctions of fuel injection.
Źródło:: Journal of KONES; 2014, 21, 4; 63-70
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Validation of reference sampling for failure detection by crankshaft angular speed analysis
Autorzy:: Dereszewski, M.
Charchalis, A.
Powiązania:: https://bibliotekanauki.pl/articles/247164.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: diagnostics
marine diesel engine
angular speed
reference comparison
Opis:: The paper presents results of the experiment focused on evaluation of records of runs of the engine in good condition as a reference for subsequent detection of faults of fuel system of medium speed diesel engine. The aim of research was determination of limits of instantaneous angular speed's spread spotted between random starts of the engine, without any fault condition simulation. Due to fine variation of the load setup and different ambient condition, every record of angular speed of independent starting, despite of attempts to sustain the same load and rotational speed value, presents some deviations between runs. Having on mind utilization of such measurement as a template for further comparison, is crucial to find out how random changes of ambient conditions and accuracy of revolutionary speed setup affect the IAS magnitude course. The answer was got in way of registration of numerous runs of the test engine after independent starts and hand adjustment of required RPM’s. The experiment was carried out at laboratory stand in Gdynia Maritime University, equipped with diesel engine Sulzer 3AL 25/30 driving electrogenerator. Sulzer 3AL 25/30 is three cylinder, medium speed, four stroke marine diesel engine, with maximum output 400 kW at 750 rpm. Independent records were treated as random variable and were compared each other. Obtained results were compared with differences between healthy engine and with simulated malfunctions of fuel injection.
Źródło:: Journal of KONES; 2014, 21, 3; 67-74
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Comparison of the dynamic riveting process of a rivet with and without a compensator
Autorzy:: Szymczyk, E.
Slawinski, G.
Jachimowicz, J.
Derewonko, A.
Powiązania:: https://bibliotekanauki.pl/articles/245374.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: riveted joint
mushroom rivet
FEM local model
deformation fields
Opis:: The paper deals with the analysis of deformation of a rivet hole in a riveted joint after the manual dynamic riveting process. For many years, riveting remains a traditional and the most popular method ofjoining in aircraft structures. The residual stress and strain state appear at the rivet hole after the riveting process, which improves the joint's fatigue behaviour. The local finite element models are made with Patran. The rivet and sheets are described using eight-noded, three-dimensional brick elements. The riveting tools consist of four-noded, two-dimensional shell elements. Numerical FE simulations of the upsetting process are carried out using the Ls-Dyna code. The contact with friction is defined between the collaborating parts of the specimen. The results of simulations of the dynamic riveting process of a mushroom rivet with and without a compensator are compared in this paper. Hole deformation of the upper and lower sheet, squeezing force, as well as deformations of the rivet head are analysed. The influence of the compensator on strain and displacement states is studied. Simulation shows that some technological factors may have positive influence on the residual stress fields. Using the rivet with a compensator results in a better rivet hole filling capability. The rivet hole displacement in upper and lower sheets are at the same level. Paper also present manual dynamic riveting process of reverse and standard riveting procedure and model of riveted specimen.
Źródło:: Journal of KONES; 2009, 16, 4; 455-462
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Comparison of the dynamic riveting process of a rivet with and without a compensator
Autorzy:: Szymczyk, E.
Slawinski, G.
Jachimowicz, J.
Derewonko, A.
Powiązania:: https://bibliotekanauki.pl/articles/245575.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: riveted joint
mushroom rivet
FEM local model
deformation fields
Opis:: The paper deals with the analysis of deformation of a rivet hole in a riveted joint after the manual dynamic riveting process. For many years, riveting remains a traditional and the most popular method of joining in aircraft structures. The residual stress and strain state appear at the rivet hole after the riveting process, which improves the joint's fatigue behaviour. The local finite element models are made with Patron. The rivet and sheets are described using eight-noded, three-dimensional brick elements. The riveting tools consist of four-noded, two-dimensional shell elements. Numerical FE simulations of the upsetting process are carried out using the Ls-Dyna code. The contact with friction is defined between the collaborating parts of the specimen. The results of simulations of the dynamic riveting process of a mushroom rivet with and without a compensator are compared in this paper. Hole deformation of the upper and lower sheet, squeezing force, as well as deformations of the rivet head are analysed. The influence of the compensator on strain and displacement states is studied. Simulation shows that some technological factors may have positive influence on the residual stress fields. Using the rivet with a compensator results in a better rivet hole filling capability. The rivet hole displacement in upper and lower sheets are at the same level. Paper also present manual dynamic riveting process ofreverse and standard riveting procedure and model of riveted specimen.
Źródło:: Journal of KONES; 2009, 16, 3; 415-422
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Comparison of the environmental impacts of a plug-in hybrid and a full electric car using life cycle assessment
Autorzy:: Szilágyi, A.
Bereczky, A.
Powiązania:: https://bibliotekanauki.pl/articles/246610.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: full electric vehicle
plug-in hybrid electric vehicle
life-cycle assessment
Opis:: Full electric (FEV) and plug-in hybrid (PHEV) vehicles are promising, forward-looking technologies to reduce greenhouse gas (GHG) emissions and other pollution related to road transport. The powertrain of a FEV is composed of a battery, control electronics and the electric motors. A PHEV has much lower battery capacity but it contains an extra internal combustion engine and gearbox. Many argue that FEVs are more energy-efficient than internal combustion engines. However, this energy needs to be stored in heavy, large-capacity battery packs that require plenty of energy and resources to produce as well as highly polluting rare earth elements mining. In this article, an environmental comparison of FEVs and PHEVs is shown using life cycle assessment (LCA). To make the comparison realistic, two models similar in size and power have been selected: Volkswagen E-Golf FEV and Volkswagen GTE PHEV. Results show that the production of FEVs need more energy and it means more burden on the environment however during the use phase it causes less emissions. Since the local electricity production mix and, in case of PHEVs, the user behaviour highly affects the results, three different countries (Hungary, Poland and Norway) and two different use types are considered. The quantified environmental footprints as well as the break-even distances are presented. Sensitivity of the results towards the assumed conditions during the whole design lifetime of the vehicles is discussed.
Źródło:: Journal of KONES; 2018, 25, 2; 363-369
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Comparison of breakup models in simulation of spray development in direct injection SI engine
Autorzy:: Ćwikowski, P.
Jaworski, P.
Teodorczyk, A.
Powiązania:: https://bibliotekanauki.pl/articles/247550.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: direct injection
combustion
gasoline
breakup models
SGDI
Opis:: Nowadays the wide range of spark ignition (SI) engines with spray guided direct injection (SGDI) is in production. Spray development is playing a major role in advanced engine design with three-dimensional computational fluid dynamics (CFD). Nevertheless still there is a need for improvement in CFD injection simulations because of the high pressure injection. The high pressure injection influences the drop breakup, coalescence and evaporation which are critical for proper representation of simulated phenomenon. Computer codes, like FIRE, give a possibility to simulate the process of injection with various types of breakup models. In spite of the importance of atomization, mechanisms of breakup are still not well understood. To obtain better understanding of breakup models simulations have been performed for the engine combustion chamber with inlet andoutlet system and SGDI strategy. For that the model was at first constructed and then imported to the Fire code. After meshing process the model has 2 million cells. The engine is not boosted and as fuel the ethanol is used. The calculations were performedfor 3500 rpm. The influence of different breakup regimes on the spray shape is presented in this study. Comparison is made for Wave, TAB (Taylor Analogy Breakup) and Reitz-Diwkar breakup models.
Źródło:: Journal of KONES; 2010, 17, 4; 123-130
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Control effectiveness comparison of wheel loaders longitudinal vibrations by means of passive and active vibration stabilisers
Autorzy:: Kosiara, A.
Powiązania:: https://bibliotekanauki.pl/articles/244576.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: wheel loader
longitudinal oscillations
active stabiliser
passive stabiliser
state controller synthesis
Opis:: When wheel loaders move with velocity higher than 10 km/h, they are subject to intense longitudinal vibrations. These vibrations are experienced particularly unpleasantly by an operator. Passive vibration stabilisers are used for controlling their intensity. They make outrigger's support more flexible so that outrigger's vibrations counteract the wheel loader's longitudinal oscillations when moving. Unfortunately, the effectiveness of passive stabilisers is insufficient and at present more effective alternative means are sought. One of the solutions for angular longitudinal vibrations includes the replacement of passive stabilisers with active stabilisers. Nevertheless, the possibility of active stabilisers’ use in minimising longitudinal vibrations requires a scientific assessment. Hence, this paper, meeting the needs, includes calculations, which allow for comparing the effectiveness of active and passive stabilisers in minimising the vibrations of a typical wheel loader. Active stabilisers, which are the subject of the study, worked based on state controller, whose synthesis was carried out on the basis of optimal control linear theory with square quality indicator. The calculations were conducted on linear models under stochastic road excitations. Stochastic excitations were defined by means of power spectral density of road's unevenness. Active stabiliser's effectiveness was analysed, both for a loader moving with an empty bucket, and for a loader transporting a 3-tonne load. In order to facilitate the analysis of the results obtained, vibrations minimising quality indicator was introduced, defined as a root of a vehicle longitudinal deflections power.
Źródło:: Journal of KONES; 2011, 18, 1; 287-294
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Comparison of the instantaneous fuel consumption of vehicles with a different type of propulsion system at constant velocity
Autorzy:: Gołębiewski, W.
Stoeck, T.
Powiązania:: https://bibliotekanauki.pl/articles/244685.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: instantaneous fuel consumption
UDC cycle
passenger car
propulsion system
constant velocity
Opis:: The paper presents a comparative analysis of the instantaneous fuel consumption of a FIAT Panda vehicle equipped with a 1.3 JTD MultiJet compression ignition engine with Common Rail fuel system. Different types of propulsion system were taken into consideration (engine positioned front-lengthwise to the direction of travel and rear-wheel drive, engine positioned front-transversely to the direction of travel and front-wheel drive, and all-wheel drive). The method for determining the instantaneous fuel consumption was based on an experimental part where the load characteristics were established (relationship between specific fuel consumption and engine torque). It was carried out for the steady states of these parameters corresponding to specific traffic conditions that represent the resistance to motion, i.e. rolling resistance and air resistance. Technical and operating characteristics of a vehicle and its design features, such as maximum weight, transmission system ratios, dynamic wheel radius, drag coefficient, width and height, and efficiency of propulsion system, had a significant impact on their individual contribution. The efficiency of transmission was adopted from a simulation for different types of propulsion system. It was important in determination of the value of instantaneous fuel consumption for constant vehicle velocities used in the UDC test (Urban Driving Cycle – subtest of the EUDC cycle). The lowest fuel consumption for a given speed of a car occurred for the front-wheel drive transmission system, whereas the highest for the all-wheel drive system (4x4).
Źródło:: Journal of KONES; 2014, 21, 3; 113-120
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Comparison the piston air engine performance with aviation gasoline (Avgas) or the E-85 ecological fuel supply
Autorzy:: Balicki, W.
Irzycki, A.
Snopkiewicz, K.
Powiązania:: https://bibliotekanauki.pl/articles/243897.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: nternal combustion engine
piston air engines
ecological fuels
exhaust pollutant
Opis:: The fuel presently used for feeding of aircraft piston engines (petrol including TEL) is characterized by "strong unfriendliness" for environment. Many research centres have been going on fuels investigation, which could substitute Avgas utilized in aviation. This is why are there no being in force for Europe standards defining the allowable emission of pollutions in exhaust gases of aircraft piston engines (equivalent to EURO - standards introduced for traction engines). The mixtures of gas o line and alcohols are tested as "alternative" aircraft fuels for spark ignition engines, and in case of Diesel engines - evenjet kerosene. During the research works on test bed carried out at Institute of Aviation the performance offour-stroke aircraft carburettor piston engine supplied by "classical" aircraft petrol and the E - 85 fuel (mixture of petrol and ethanol) were compared. Except for measuring the functional parameters of engine (rotational speed, torque, specific fuel consumption, pressures and temperatures) the emissions of gaseous pollutants incorporated in exhaust gas were measured and analyzed. The range of modifications of engine supply system - necessary to introduce in case of changing of fuel type within the tested engine -was worked up. There are foreseen comparative test of fuelling the engine with mixtures of petrol and alcohols in different proportions in the next phase of research works.
Źródło:: Journal of KONES; 2010, 17, 3; 25-32
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Comparison of pollutant emissions test cycles for IC engines
Porównanie cykli badawczych do pomiaru emisji zanieczyszczeń z silników spalinowych
Autorzy:: Żółtowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/243136.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
silniki spalinowe
emisja zanieczyszczeń
badania silników
internal combustion engines
emission of pollutants
engine testing
Opis:: Na świecie opracowano wiele cykli badawczych używanych do wyznaczania emisji toksycznych składników spalin z układów wylotowych silników. W niniejszej pracy porównano wyniki badań emisji zanieczyszczeń z silnika stosowanego do napędu autobusu, zmierzone na stanowisku hamownianym przy zastosowaniu trzech różnych cykli badawczych symulujących nieustalone warunki pracy silnika. Użyte w badaniach cykle pomiarowe to European Transient Cycle stosowany w homologacji europejskiej, Heavy Duty Diesel Transient Cycle stosowany w USA oraz Non Road Transient Cycle, stosowany przy homologacji silników maszyn ruchomych. Cykle te porównano ze sobą dokonując ich analizy statystycznej poprzez określenie funkcji rozkładu częstości występowania momentu i prędkości obrotowej silnika. Przeprowadzono dyskusję nad otrzymanymi wynikami pomiarów emisji, wykazano różnice w średnich parametrach charakteryzujących porównywane cykle badawcze uzasadniając tym uzyskane wyniki pomiarów emisji. Praca stanowi próbę odpowiedzi na pytanie, czy jest możliwe zamienne stosowanie cykli badawczych do wyznaczania wskaźników charakteryzujących właściwości emisyjne silnika i czy w wyniku zamiany cyklu badawczego można spodziewać się otrzymania podobnych wyników ?
There are many test cycles used for measurement of pollutant emissions from exhaust systems in internal combustion engines. In the paper are compared results of pollutant emissions testing in three different test cycles simulating transient conditions of engine operating in bus. There were used following test cycles: European Transient Cycle used in European type approval testing, Heavy Duty Diesel Transient Cycle used in USA and Non Road Transient Cycle used in type approval testing for off-road engines. These cycles were compared by using statistic analysis as well as drawing of histogram for engine torque and speed. In discussion about test results are indicated differences between mean parameters specific for each cycle. These differences are the reason why emission test results for each cycle are different. Author of this paper wanted to find answer to following question: is it possible to replace with one another emission transient test cycles and can we look forward similar emission test results for different kind of cycles?
Źródło:: Journal of KONES; 2007, 14, 2; 591-598
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Simulative comparison of the traction properties of Daewoo Lublin 3 Mi van with particular types of gearbox
Autorzy:: Prajwowski, K.
Gołębiewski, W.
Powiązania:: https://bibliotekanauki.pl/articles/244475.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: traction characteristics of a vehicle
theory of motion
combustion engines
external characteristic of an engine
power transmission system
Opis:: A problem of comparing the traction properties of Daewoo Lublin 3 Mi van with respective types of gearbox has been taken up in the paper. There were three gearbox types: TS5-21, PD.97 and ZF. These properties were concluded based on vehicle traction graph. They included: reaching the reserve driving force in respective gears, obtaining accelerations, overcoming the resistances to motion (rolling resistance, air resistance and grade resistance) as well as achieving the maximum speed. Vehicle traction diagram has been made based on the torque curve of Andoria 4CTi90 engine external characteristics obtained on engine test bed in a direct way using an AVL eddy current brake. The engine was supplied with a complete fuel dose and loaded with the resistance torque produced by engine brake. The characteristics was performed every 200 rpm from 1000 rpm to maximum revolutions and the other way from maximum revolutions to 1000 rpm every 200 rpm. The torque characteristics points were determined as a mean value obtained from these two measurements. After considering the data from engine external characteristics, vehicle information (including, among others, respective gear ratios and final drive ratio, under-the-bonnet power loss coefficient, and dynamic wheel radius) and the resistances to motion, a vehicle traction diagram of Daewoo Lublin 3 Mi van was made for three types of gearboxes. Based on this, the authors found that a Daewoo Lublin 3 Mi van equipped with ZF gearbox is the best from the point of view of traction properties.
Źródło:: Journal of KONES; 2011, 18, 1; 483-490
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Comparison of dynamic loads four-cylindre and six-cylindre combustion engine with similar work
Porównanie obciążeń dynamicznych cztero- i sześciocylindrowego silnika spalinowego o podobnych wskaźnikach pracy
Autorzy:: Kaźmierczak, A.
Wójtowicz, E.
Powiązania:: https://bibliotekanauki.pl/articles/245672.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
silnik spalinowy
dynamika
układ korbowy
combustion engines
dynamic
PRC unit
Opis:: The aim of this research was comparison of dynamic forces affecting on a crank — shaft - piston arrangement in four and six cylinder's engine with similar circumstances of work. For this research crank - shaft - piston arrangement was separated on parts for determine mass and centers of gravity for every part. After reduction of this mass were calculated dynamical inertial forces of first and second order and centrifugal forces affecting in unbalanced arrangement and affecting with balanced arrangement. Third step was calculations of total moments from mass forces in crank shaft's limb. Sum of these forces after addition is an external balance of engine. Last step of research was calculations of final force affecting on a crank - shaft -piston arrangement, and final force affecting in cylinder's pivot what is a sum of gas force and mass force. Knowledge value of this force let to calculate force affecting in piston of crank shaft, force affecting on a surface of cylinder, perpendicular T force and radial R force. Calculations of mass-forces showed that in the crank-system of a four-cylindrical engine, their values were greater than in a six-cylin drical system approx. 23% -for inertial forces on the reciprocating run, and approx. 42% -for centrifugal forces.
Celem pracy jest porównanie obciążeń dynamicznych silnika czterocylindrowego i sześciocylindrowego 0podobnych parametrach pracy. W tym celu układ korbowo-tłokowy został podzielony na poszczególne elementy tak, aby możliwe było określenie masy każdego elementu osobno oraz wyznaczenie środków ciężkości korbowodów i ramion wykorbienia. Po dokonaniu redukcji mas zostały obliczone siły bezwładności pierwszego i drugiego rzędu oraz siły odśrodkowe, działające w układzie niewyrównoważonym i wy równoważonym przeciwciężarami. Następnie, obliczono występujące w układzie momenty pochodzące od sił masowych działających na ramieniu wału korbowego, które po zsumowaniu stanowią wypadkowe wy równoważenie zewnętrzne silnika. Końcowym etapem pracy było obliczenie siły wypadkowej obciążającej układ korbowy, działającej w osi cylindra, która jest sumą siły gazowej i siły bezwładności. Znając wartość siły wypadkowej możliwe było określenie siły działającej w osi korbowodu, siły działającej na gładź cylindra oraz siły stycznej i promieniowej. Obliczenia sił masowych wykazały, że w układzie korbowym silnika czterocylindrowego ich wartości są większe niż w układzie sześciocylindrowym o około 23% — dla sił bezwładności w ruchu posuwisto-zwrotnym, oraz o około 42% - dla sił odśrodkowych.
Źródło:: Journal of KONES; 2009, 16, 4; 217-226
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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