Autor: Niewczas, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Wear profile of the cylinder liner in a motor truck diesel engine
Autorzy:: Koszałka, G.
Niewczas, A.
Powiązania:: https://bibliotekanauki.pl/articles/244295.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: diesel engine
wear
cylinder liner
Opis:: The paper presents results of investigation of cylinder liners wear. The investigation was carried out on diesel engines during long lasting operation in 5 motor trucks. Cylinder diameters were measured in two perpendicular planes on four depths using 2-point bore gauge, after removal of the cylinder head. Measurements were made every 50 000 km of vehicle mileage. Such methodology of measurements enabled to determine time course and wear profile of the cylinder liners (wear value in relation to the direction and height of the liner). It was stated that increments of diameter during the first period of operation are several times higher than during the later periods, when the wear intensity is constant. It was also found that wear of the cylinder liner in the plane perpendicular to the engine axis is bigger than in the parallel plane, and that wear in the upper part of the liner is twice as big as in its middle part. Measurement scheme for the cylinder liner; histogram of cylinder liner diameters obtained in measurements after the technological running-in of the engine after mileage of 0, 50,000 km, 150,000 km and 250,000 km, wear profiles of cylinder liners in the two directions at different vehicle mileages are presented in the paper. Estimated profiles of the cylinder liner wear will be used as input data for the calculations of the blowby intensity with the use of mathematical model of PRC set.
Źródło:: Journal of KONES; 2007, 14, 4; 183-190
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effect of friction force determination method on results obtained from model of gas flow from combustion chamber to the crankcase
Autorzy:: Koszałka, G.
Niewczas, A.
Guzik, M.
Powiązania:: https://bibliotekanauki.pl/articles/245664.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
blowby
piston ring
friction force
mathematical model
Opis:: The paper presents investigation of the influence of the friction force calculation method on the results of simulations run with the use of the model ofgas flow from the combustion chamber to the crankcase and piston rings motion in the grooves. The first series of simulations was run using the gas flow and ring motion model in which the friction force was calculated from the empirical equation. The second series was run with the use of the gas flow and ring motion model fully integrated with the ring lubrication model. In that case the friction force was derived from the hydrodynamic model of ring lubrication. Comparison of the results obtained in the first and second series of simulations indicated that despite the fact that the friction forces calculated with these two methods differed considerably, the method of friction force calculation had insignificant effect. This refers to the ąuantities determined in the simulations which are most important from practical point of view - i.e. displacements of the rings in the grooves, pressure courses in inter-ring regions and blowby rate. It is not necessary to integrate the gas flow and ring motion model with the model of ring lubrication, and doing so to complicate it very much, if the aim of the calculations is simulation of blowby and rings behaviour in the grooves.
Źródło:: Journal of KONES; 2009, 16, 4; 223-239
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A numerical model for calculation of piston rings wetted area in a combustion engine
Autorzy:: Guzik, M.
Koszałka, G.
Niewczas, A.
Powiązania:: https://bibliotekanauki.pl/articles/246518.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
ring pack
lubrication
simulation
wear
mechanical losses
Opis:: Assumptions made while modelling the oil film between the ring and the cylinder liner in IC engines, especially concerning the boundaries of the wetted area of the ring face surface, were discussed and the assumptions adopted for the developed model were presented in this study. It was assumed that the model should take into account partially flooded lubrication, which meant that the boundaries of the ring wetted area had to be determined. Based on the adopted assumptions, a model for calculation of the oil film thickness between the cylinder and moving rings, and thickness of the oil film left on the cylinder by the ring pack was developed. A computer application operating in the Windows operation system was developed to carry out numerical calculations. The results of initial numerical calculations were also presented. The proposed model can be utilized to determine the effects of the ring pack geometry, especially the geometry of the ring surface, on parameters of lubrication. These parameters, including the oil film thickness, distribution of pressure in oil film or tangential force, are crucial for friction and wear of cooperating surfaces, oil consumption, and flow of gas from the combustion chamber to the crankcase, thus playing a role in the durability, fuel consumption and emission of an engine.
Źródło:: Journal of KONES; 2012, 19, 3; 156-164
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A method of automotive engine life forcasting on the basis of laboratory start- ups test
Autorzy:: Koszałka, G.
Niewczas, A.
Kordos, P.
Powiązania:: https://bibliotekanauki.pl/articles/244201.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
cylinder liner
life estimation
start-ups
wear
Opis:: The results of previously conducted research shows that in the case of automotive engines wear accompanying engine start-ups has significant contribution to the total wear of cylinder liner. Thus, it was assumed that wear of the liner measured after high number of start-ups can be representative for given conditions of engine operation in the vehicle and can be used to forecast engine life. The paper describes a new method of automotive engine durability prediction on the basis of wear measured after so called start-ups test. The start-ups test consists of series of repeatable cycles during which engine is started-up in precisely established temperature and operates for short time with no load and then is shut down and cooled down. To conduct the new test it is indispensable to obtain data regarding start-up conditions. But these data can be precisely determined on the basis of simple measurements made on any existing engine installed in a vehicle used in expected way. Moreover, the cost of the new test is significantly lower (minimal fuel consumption, engine does not have to be installed on dynamometer stand) and duration is shorter than in the case of standard tests. Considering advantages of the new start-ups test, it can be recommended as a part of the test stand reliability research of automotive engines. The developed method is simple and short and can be a complementary one to existing standard reliability research methods.
Źródło:: Journal of KONES; 2008, 15, 2; 207-215
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A modular low- bed semi-trailer for transportation of machines and other heavy and big loads
Autorzy:: Koszałka, G.
Niewczas, A.
Kaczor, M.
Taratuta, L.
Głowacz, Ł.
Powiązania:: https://bibliotekanauki.pl/articles/245791.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: road transport
oversize and heavy loads
low-loader
steering system
strength analysis
FEM
Opis:: The paper presents the assumptions made and solutions used in a newly designed low-bed semi-trailer for the transportation of heavy and oversized loads, especially heavy self-propelled road machinery. During the design phase, special attention was paid to the versatility of the semi-trailer. The semi-trailer consists of 4 main modules: a hydraulic removable gooseneck allowing for coupling the semi-trailer to a tractor unit, an extendable low bed, a 2- axle bogie and a 3-axle bogie. The modules can be combined in different ways to create different configurations of the semi-trailer. Owing to that, the carrying capacity of the semi-trailer can be easily matched to the equipment carried. Depending on the current needs, the semi-trailer can have 2, 3 or 5 axles, a payload from 28 to 65 tons, and a length from 13.2 to 20.1 m. Wheeled and caterpillar vehicles can drive onto the lowbed from the front, after the gooseneck has been detached. The length and width of the bed can be adjusted within the range of 2 and 0.6 m, respectively. An important advantage of this semi-trailer is the fact that in a 2-axle configuration it meets the regulations for standard trailers and can be driven in public roads and carry normal loads without a special permission. Thanks to the fact that all its wheels are steered and controlled by a hydraulic steering system, the semi-trailer has very good manoeuvrability despite its long length. The semi-trailer meets rigorous safety demands – it is equipped with a braking system with ABS/EBS, an advanced load fixing system, marking and lighting systems and others. Research and development experiments performed during the design process, among others those concerning the steering system and optimization of the supporting structure of the semi-trailer using FEM analysis, are characterized in this paper.
Źródło:: Journal of KONES; 2013, 20, 3; 237-244
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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