Temat: valve seat - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of valve-seat angles to operation values and emissions of medium-speed diesel engines
Autorzy:: Marquardt, Leander
Kate, Heiner Joachim
Reinke, Andreas
Kockskämper, Niklas
Powiązania:: https://bibliotekanauki.pl/articles/2204626.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: medium speed engines
gas exchange
valve-seat angle
flow coefficient
thermal load
Opis:: For the development of gas exchange for large diesel engines, a compromise has to be found between efficient valve-flow and the time between overhauls. On the one hand, large effective flow areas, especially during valve-overlap, are demanded. On the other hand, there are limitations of cylinder bore regarding the maximum diameter of inlet and outlet valves and the minimum distance (dead space) between valves and piston, as well as wear-related smaller seat angles. For large medium-speed diesel engines, a valve-seat angle of = ° for inlet and outlet valves is a standard application. For engine-operation with clean fuels, a valve-seat lubrication (gasoil) or smaller seat angles (natural gas) need to be applied. With this presentation, the basic influence of different valve-seat angles on the operation values and emissions will be considered for the example of the single-cylinder research engine FM16/24. Using a self-developed testbed, experimental investigations into effective flow areas as a function of valve-lift at inlet and outlet valves have to be executed. With this input, different cycle calculations including T/C have to be carried out to determine deviances in specific fuel-oil consumption, exhaust-gas temperatures, NOx emissions and air/fuel ratio. The results will be discussed critically.
Źródło:: Acta Mechanica et Automatica; 2023, 17, 2; 173--179
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Abrasive wear resistance of Fe3Al and Satellite 6 coatings for the protection of valve seats surfaces
Autorzy:: Szczucka-Lasota, Bożena
Tarasiuk, Wojciech
Cybulko, Piotr
Węgrzyn, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/27311342.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: valve seat
abrasive wear
intermetal Fe3Al
Stellite 6
gniazdo zaworu
zużycie ścierne
Opis:: The development of a technology that increases the service life of valve seats in CNG/LNG-powered vehicles requires the appropriate selection of material and the technology of its application. Commercially used valve seat materials show accelerated wear under operating conditions, especially in natural gas vehicle engines. The authors developed a new material concept and a new technological concept for the protection of the valve seat in CNG/LNG-powered vehicles. This article aims to present the first stage of tribological research. Two materials were used in the research: Stellite 6 alloy and Fe3Al intermetal. A commonly used material for valve seats of combustion engines is Stellite 6. The Fe3Al is the new proposed material coating for the protection of the valve seats of internal combustion engines. This article compares the abrasive wear resistance of these materials. The abrasion tests were performed on a T-11 pin-on-disc tester, and the counter-sample was steel S235JR. The test conditions were similar to those prevailing during the operation of the valves in the head of the internal combustion engine, without the influence of temperature. The obtained results indicate that the Fe3Al intermetal is characterized by a lower coefficient of friction and lower wear intensity than Stellite 6. The results confirm that the Fe3Al phase is a prospective material to be used as a protective material on the valve seat of vehicles.
Źródło:: Zeszyty Naukowe. Transport / Politechnika Śląska; 2023, 118; 219--228
0209-3324
2450-1549
Pojawia się w:: Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Modelowanie sił skrawania występujących przy obróbce gniazd zaworowych
Cutting forces modeling for valve seats machining
Autorzy:: Matuszak, M.
Powałka, B.
Powiązania:: https://bibliotekanauki.pl/articles/359419.pdf
Data publikacji:: 2009
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:: modelowanie sił skrawania
obróbka gniazda zaworowego
symulacja sił skrawania
cutting forces modeling
valve seat machining
cutting forces simulation
Opis:: W artykule przedstawiono sposób modelowania sił skrawania występujących podczas obróbki gniazd zawo-rowych. Opisano siły skrawania działające na narzędzie do obróbki gniazd zaworowych oraz przedstawiono zależności matematyczne wykorzystane do modelowania sił skrawania. Zaprezentowano narzędzie użyte do obróbki gniazd zaworowych oraz opisano przebieg procesu obróbki. Dokonano symulacji wpływu usta-wienia narzędzia względem gniazda zaworowego na przebiegi pól powierzchni warstw skrawanych przez ostrza narzędzia. Zaprezentowano zasymulowane przebiegi sił skrawania dla różnych przypadków ustawienia narzędzia względem gniazda zaworowego. Zaprezentowano stanowisko, na którym weryfikowano wartości sił skrawania uzyskane podczas symulacji w porównaniu z siłami występującymi podczas obróbki gniazd zaworowych. Przedstawiono ogólne wnioski wynikające z przeprowadzonych symulacji oraz plany dalszych badań.
The paper presents cutting forces simulation method for valve seats machining. Cutting forces affecting on tool used for valve seats machining and mathematical relations used for simulating forces were described. Tool used for valve seats machining was presented and machining process was described. Analysis of tool setting against machined valve seat impact on area of the chip on tool blades was made by simulation. Simulated cutting forces for different tool settings against machined valve seat were presented. Test stand for verifying simulated cutting forces against measured cutting forces was characterized. General conclusions arising from simulations and further research plans were presented.
Źródło:: Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2009, 17 (89); 63-67
1733-8670
2392-0378
Pojawia się w:: Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The influence of the engine load on value and temperature distribution in the valve seats of turbo diesel engine
Wpływ obciążenia na wartość i rozkład temperatury w gniazdach zaworowych doładowanego silnika z zapłonem samoczynnym
Autorzy:: Gustof, P.
Hornik, A.
Powiązania:: https://bibliotekanauki.pl/articles/375592.pdf
Data publikacji:: 2009
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: silnik Diesla
gniazdo zaworowe
metoda elementów skończonych
modelowanie numeryczne
program COSMOS/M
diesel engine
valve seat
numerical modeling
finite element method
COSMOS/M program
Opis:: In this paper was presented the numerical computations of the influence of engine load on value and temperature distribution of characteristic surfaces of the heat transfer of the valve seats in Turbo diesel engine at the beginning phase of its work. The computations were performed by means of a two-zone combustion model, the boundary of III kind conditions and the finite elements method (FEM) by adaptation of the COSMOS/M program.
W niniejszej pracy przedstawiono wyniki obliczeń wpływu obciążenia na wartość i rozkład temperatury charakterystycznych powierzchni wymiany ciepła gniazd zaworowych dla doładowanego silnika z zapłonem samoczynnym w początkowej fazie jego pracy. Obliczenia numeryczne zostały przeprowadzone przy zastosowaniu dwustrefowego modelu procesu spalania, warunków brzegowych III rodzaju oraz metody elementów skończonych (MES) za pomocą programu COSMOS/M.
Źródło:: Transport Problems; 2009, 4, 2; 37-42
1896-0596
2300-861X
Pojawia się w:: Transport Problems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The researches on the tribological properties of elements of the seat insert-valve-valve guide assembly
Autorzy:: Siczek, K.
Powiązania:: https://bibliotekanauki.pl/articles/247690.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
valve timing
lightweight valve
seat insert
valve guide
Opis:: The researches have been carried out, where the object has been the elements of valve trains in the different combustion engines. Those elements have been valve, valve guide and seat insert. The analysed valves have been driven by special camshaft, with the cams of trapezoid shape. The special research stand has been elaborated and its scheme has been presented in the article. The mentioned research stand has been driven by electric motor. The rotational velocity of the camshaft has been controlled and measured. The aim of the researches has been to obtain values of wear for valve, seat insert, valve guide vs. valve lift, and rpm of camshaft. The dynamic parameters have been analyzed for the seat insert - valve - valve guide assembly, experimentally and by simulation either. During researches the values of valve lift, of valve acceleration, of temperature for seat insert and additionally sound level have been measured. The wear of valve, seat insert and valve guide has been measured, basing on their initial and post-research geometry. The results of experimental researches obtained for different materials for valve, valve guide and seat insert have been presented in the article. The simulation model of the analyzed seat insert - valve - valve guide assembly has been elaborated and presented in the article. Such model has been needed to calculate the values o f the settle velocityfor the analyzed valve. The wear of titanium valve has been a little greater than of the steel valve, the wear of cast iron seat insert mating with steel valve has been much greater than for titanium valve case. The wear of valve guides, made of bronze has been several times less than those of cast iron.
Źródło:: Journal of KONES; 2010, 17, 4; 423-430
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The simulation researches on the wear for elements of the seat insert-valve-valve guide assembly
Autorzy:: Siczek, K.
Kuchar, M.
Powiązania:: https://bibliotekanauki.pl/articles/247694.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
valve timing
lightweight valve
seat insert
valve guide
Opis:: The researches have been carried out, where the object has been the elements of valve trains in the different combustion engines. Those elements have been valve, valve guide and seat insert. The analysed valves have been driven by special camshaft, with the cams of trapezoid shape. The special research stand has been elaborated and its scheme has been presented in the article. The mentioned research stand has been driven by electric motor. The rotational velocity of the camshaft has been controlled and measured. The aim of the researches has been to obtain values of wear for valve, seat insert, valve guide vs. valve lift, and rpm of camshaft. The dynamic parameters have been analyzed for the seat insert - valve - valve guide assembly, experimentally and by simulation either. During researches the values of valve lift, of valve acceleration, of temperature for seat insert and additionally sound level have been measured. The wear of valve, seat insert and valve guide has been measured, basing on their initial and post-research geometry. The results of experimental researches obtained for different materials for valve, valve guide and seat insert have been presented in the article. The simulation model of the analyzed seat insert - valve - valve guide assembly has been elaborated and presented in the article. Such model has been needed to calculate the values o f the settle velocityfor the analyzed valve. The wear of titanium valve has been a little greater than of the steel valve, the wear of cast iron seat insert mating with steel valve has been much greater than for titanium valve case. The wear of valve guides, made of bronze has been several times less than those of cast iron.
Źródło:: Journal of KONES; 2010, 17, 4; 431-438
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Tribological properties of the seat insert - valve - guide assembly for valve driven magnetoelectrically
Autorzy:: Siczek, K.
Powiązania:: https://bibliotekanauki.pl/articles/247681.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
valve timing
seat insert
valve guide
magnetoelectrical drive
Opis:: The researches have been carried out, where the object has been the set of two friction couples: valve stem - valve guide and valve seat - seat insert. The camless driven valve has been common for each of such cases. The analyzed valve has been driven by magnetoelectrical drive. The speciał research stand has been elaborated and its scheme has been presented in the article. It has been measured the valve lift and valve acceleration, the impact force, the friction force, temperature values for valve guide and for seat insert, sound level during impacting on the stand. The aim of researches has been to determine the dynamic parameters, the friction force between valve stem and valve guide, the impact force for valve impacting seat insert vs. frequency and valve lift. The analyzed valves have mated with seat inserts and valve guides made of cast iron, in oil absence. The valves have been made of TiAl6Zr4Sn2Mo2 alloy. The researched friction couples have operated in temperature equal 293 K. The increase of frequency has resulted in small changes for values of lift and in greater changes of acceleration, during valve impact into its seat insert. The greatest values of impact force and acceleration have been for the small, middle and high values of valve lift, either. The ratio of impact force and valve acceleration has changed in thin bands. The friction force has decreased slightly with frequency increase and has decreased with valve lift increase. The sound level has increased with the frequency increase, and has not been dependent upon valve lift.
Źródło:: Journal of KONES; 2010, 17, 4; 439-445
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Research on the tribological parameters for materials couples used for valves, valve guides and seat inserts
Badania parametrów tribologicznych skojarzeń materiałów stosowanych na zawory, prowadnice i gniazda
Autorzy:: Siczek, K.
Kuchar, M.
Powiązania:: https://bibliotekanauki.pl/articles/188115.pdf
Data publikacji:: 2010
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: stop TiAl
zawór
prowadnica
gniazdo
tribotester
model symulacyjny
TiAl alloys
valve
valve guides
seat insert
model
Opis:: Research on the tribological properties of TiAl alloys used for valves mating with valve guides and seat inserts, made of cast iron, has been done. The aim of the research has been to obtain values of the coefficient of friction for such tribological pairs and to simulate the dynamics of the material sample – rotating plate assembly, characteristic used in the research stand. The modified research stand is presented in the article. During research the values of the coefficient of friction, the temperature of sample, the level of sound and the acceleration of material sample were measured. The model of the research stand was for the simulation of the dynamics for the material sample – rotating plate assembly. The plots of the coefficient of friction vs. loading, slide velocity, and the duration of the motion of material sample in respect to the rotating plate are presented in the article. Using simulation results, the values of the damping coefficient were estimated, which allow one to obtain the value for the amplitude of the modelled motion for the material sample in respect to the rotating plate near to the value of the amplitude for the real motion. This estimation allows one to forecast the dynamics of the mentioned assembly for other values of velocity and loading.
Przeprowadzono badania własności tribologicznych stopów TiAl, używanych dla zaworów współpracujących z żeliwnymi prowadnicami i gniazdami. Celem badań było uzyskanie wartości współczynnika tarcia dla tych par ciernych i symulacja dynamiki układu próbka materiału–wirująca tarcza, odpowiadającej wykorzystywanemu stanowisku badawczemu. W artykule przedstawiono zmodyfikowany tribotester typu pin-on-disc. Podczas badań mierzono wartości współczynnika tarcia, temperatury próbki, poziomu hałasu i przyspieszenia próbki materiału, a ich zależności od prędkości, obciążenia i liczby obrotów przedstawiono na wykresach. Opracowano model tribotestera do symulacji parametrów dynamicznych układu próbka materiału–wirująca tarcza. W oparciu o wyniki symulacji oszacowano wartości współczynników tłumienia, pozwalające uzyskać symulowana amplitudę ruchu próbki względem wirującej tarczy zbliżoną do amplitudy rzeczywistego ruchu. Określenie tego współczynnika tłumienia pozwala przewidywać parametry układu przy innych wartościach prędkości i obciążenia.
Źródło:: Tribologia; 2010, 5; 253-262
0208-7774
Pojawia się w:: Tribologia
Dostawca treści:: Biblioteka Nauki

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