Temat: valve - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Conception of the throttle-return valve for the magnetorheological fluid
Autorzy:: Pilch, Z.
Domin, J.
Powiązania:: https://bibliotekanauki.pl/articles/141020.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: magnetorheological fluid
throttle valve
return valve
throttle-return valve
FEMM
Opis:: The paper presents the concept of the throttle-return valve dedicated for magnetorheological fluid. Basic properties of the magnetorheological fluid, valve conception and field calculations were presented.
Źródło:: Archives of Electrical Engineering; 2018, 67, 1; 37-49
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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: 3.

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: 4.

Tytuł:: Measurement and evaluation of functional and operational coefficients of hydraulic solenoid valve prototypes used for variable valve timing control in combustion engines
Autorzy:: Kalinowski, Marcin
Kamiński, Zbigniew
Powiązania:: https://bibliotekanauki.pl/articles/1837936.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: variable valve timing
hydraulic solenoid valve
prototype verification
Opis:: : This paper describes the engineering structure and functions of a typical solenoid valve used in hydraulic mechanisms that are based on variable camshaft timing (VCT). The main operating parameters and functional utility coefficients of hydraulic solenoid valves have been defined. Tests of 10 reference and 10 prototype valves were run on a test stand for a comparative assessment of both engineering concepts based on Welch and Mann–Whitney statistical tests of the mean values of designated coefficients. The studies identified differences between both designs, and the obtained research material was used as an input to improve the performance of the engineered concept. To perform a final evaluation of the effects that arise as a result of changes introduced to some functional–operational coefficients, additional tests are required to be run on an engine testbed. The applied test methodology may then be used for control and verification tests of the valves, which can further be used in VCT technology.
Źródło:: Acta Mechanica et Automatica; 2021, 15, 2; 74-81
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Increase of the total efficiency using the Atkinson cycle in the spark ignition engine
Autorzy:: Sendyka, B.
Sochan, A.
Powiązania:: https://bibliotekanauki.pl/articles/242315.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: variable valve timing
setting of valve timing
Atkinson cycle
Opis:: The paper presents the results of investigations performed on a combustion engine with Atkinson cycle included and application of variable valve timing. Investigations were carried out at constant rotational speed 2500 and 3500 RPM and at throttle opening 25% and 50%. Influence of the advance/delay angle of inlet valves closing on formation of exhaust gases toxic components such as: carbon monoxide, hydrocarbons and nitric oxides was presented. Basing on the obtained results difference of toxicity of exhaust gases before and after application of phase shifter and their concentration in places of total efficiency increments was demonstrated. Especially The Atkinson cycle comparing with conventional Otto cycle, characteristics of the electric motor applied in Toyota Prius generation, starting and work of engines (combustion engine and electric motor) during vehicle standstill, relation of specific fuel consumption in function of rotational speed for a Toyota Prius engine, generation II, in total efficiency of engines with Atkinson cycle and Mitsubishi GDI in function of rotational speed, relative increase in total efficiency as rotational speed function, influence of intake valves opening angle on concentration in exhaust gases: carbon monoxide, hydrocarbons and nitric oxides at diferrent throttle opening values are presented in the paper.
Źródło:: Journal of KONES; 2009, 16, 2; 407-411
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Aortic valve stenosis and its recent treatment techniques
Autorzy:: Witkowski, Adam
Powiązania:: https://bibliotekanauki.pl/articles/1916637.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: acquired aortic valve stenosis
transcatheter aortic valve implantation
comorbidities
Opis:: Aortic stenosis is the most common acquired valvular heart disease. Aortic stenosis has growing prevalence in people older than 75 years and natural course of disease is characterized by high mortality rate. According to epidemiological data all patients with aortic stenosis will die after 2–5 years from the first signs of disease if not undergo aortic valve replacement. However, even 40% of patients do not have surgery because of comorbidities related to advanced age. This was the main reason why in 80- and 90-ties of XX century there were intensive attempt to developed an alternative, less invasive treatment methodology for people with aortic stenosis and comorbidities and at high surgical risk. Transcatheter aortic valve implantation (TAVI) was introduced by Dr Alain Cribier in February 2nd, 2002 in Rouen, France. Since that day different aortic transcatheter bioprostheses were used in many randomized clinical trials comparing their safety and effectiveness versus surgical aortic valve replacement. Gradually, it became clear that in all older patients in all risk groups TAVI was equally or even more safe and effective than surgery. Complications after TAVI are relatively rare, but some of them are life-threatening. Heart Team plays a key role in patients selection to TAVI.
Źródło:: Nauka; 2020, 2
1231-8515
Pojawia się w:: Nauka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The control of valve timing with magnetoelectric actuators
Autorzy:: Siczek, K.
Kuchar, M.
Powiązania:: https://bibliotekanauki.pl/articles/245603.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
camless valve timing
valve timing control
magnetoelectric drive
Opis:: The new control algorithm for the valve timing in camless combustion engine is presented in the article. The magnetoelectric actuators have been used in the valve timing for analyzed popular combustion engine. Each titanium valve has been connected with the coil of actuator. Such coil can move in the magnetic field, generated in magnet circuit containing sintered Nd-Fe-B magnets, the core, pole shoes and air gaps. The movement of coil can occur when current flows in the coil winds and then electrodynamic force is generated. The nonlinear curves of generated electrodynamic force versus displacement of coil - valve assembly and vs. current in the coil have been computed using FEM method and presented in the article. The new mathematical model has been elaborated to calculate valve lift vs. coil lift for different coil currents and dynamic parameters of the coil. The values of current in coil should be controlled by the elaborated algorithm with the feedback. This algorithm has been based on tracing of position points of valve, during valve movement. The modelled course of valve lift vs. time has been first elaborated, for the needed rpm of engine. Next the first approximated current pulse train has been generated, the movement of the coil - valve assembly could be obtained. The calculated position of valve has been compared with the valve position from modelled course of valve lift vs. time. Basing on obtained difference of valve lift, the next current pulse train has been corrected in such a way, to obtain in any moment the closest position of valve to the one from modelled course. The obtained courses of valve lift vs. time for different modelled courses of valve lift vs. time and vs. rpm of engine have been presented in the article.
Źródło:: Journal of KONES; 2009, 16, 3; 357-365
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

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: 9.

Tytuł:: Badania biologiczne warstw powierzchniowych w aspekcie zastosowania na pierścień zastawki serca
Biological properties of surface layers for ring of heart valve application
Autorzy:: Gonsior, M.
Kustosz, R.
Borowski, T.
Ossowski, M.
Sanak, M.
Jakiełła, B.
Czarnowska, E.
Wierzchoń, T.
Powiązania:: https://bibliotekanauki.pl/articles/285447.pdf
Data publikacji:: 2011
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: zastawka serca
sztuczna komora serca
POLVAD
heart valve
heart valve rings
Opis:: Oryginalna sztuczna komora wspomagania serca POLVAD opracowana w Polsce, została zastosowana dotychczas w leczeniu ponad 210 pacjentów. Najdłuższe wspomaganie serca za pomocą komory POLVAD trwało ponad rok. Dla protezy tej opracowywana jest innowacyjna zastawka dyskowa, z nisko profilowym pierścieniem wykonanym ze stopu tytanu. Dla zminimalizowania trombogenności pierścienia zastawki opracowano dyfuzyjne warstwy powierzchniowe: azotowaną typu TiN+Ti2N+αTi(N) i tlenoazotowaną typu TiO2+TiN+Ti2N+αTi(N), wytwarzane obróbką jarzeniową na potencjale plazmy. Trombogenność różnych kompozycji warstw została porównana w aspekcie aktywacji i adhezji płytek krwi do powierzchni biomateriału. Oceniono również wpływ metody sterylizacji biomateriału na intensywność adhezji trombocytów do jego powierzchni. Warstwy TiN oraz TiO2wykazały najniższą trombogenność, przy czym dla warstwy TiN korzystniejsza jest sterylizacja gazowa, podczas gdy dla warstwy TiO2- sterylizacja plazmowa.
The original ventricular assist device POLVAD developed in Poland was used in over 210 patients so far. The longest POLVAD heart assistance excided one year. The innovative tilting disk valve with low profile ring made of titanium is developed for POLVAD. To minimize the valve ring thrombogenicity the diffusive surface layers were manufactured: nitriding TiN+Ti2N+αTi(N) and oxynitriding TiO2+TiN+Ti2N+αTi(N), in the glow discharge process on the plasma potential level. The thrombogenicity of different layers compositionwas compared regarding platelets activation and platelets adhesion to the material surface. The influence of material sterilization method on the platelets adhesion intensity was evaluated in addition. The nitriding TiN and oxynitriding TiO2layers have demonstrated the lowest thrombogenicity while the gas sterilization was the most profitable for nitriding layers – TiN and the plasma sterilization for oxynitriding layers – TiO2.
Źródło:: Engineering of Biomaterials; 2011, 14, 102; 15-22
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Variable valve timing scheduling in a 4-stroke internal combustion cylinder utilizing artificial neural networks
Autorzy:: Bapiri, S.
Chaghaneh, O.
Ghomashi, H.
Powiązania:: https://bibliotekanauki.pl/articles/103166.pdf
Data publikacji:: 2017
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: variable valve timing
cylinder pressure
independent valve operation
artificial neural network
Opis:: The apparently simple structure of a four-stroke internal combustion cylinder belies the complicated problem of optimizing valve operation in response to a change in crankshaft rotation speed. The objective of this study was to determine the cylinder pressure for valve event angles in order to determine the optimal strategy for the timing of valve events when independently-actuated valves are available. In this work, an artificial neural network is applied to create a prediction matrix to anticipate the best variable valve timing approach according to rotation speed.
Źródło:: Advances in Science and Technology. Research Journal; 2017, 11, 3; 114-121
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Pośrednia metoda pomiaru mikroprzecieków w zaworach hydraulicznych
Indirect method of measuring micro-leaks in hydraulic valves
Autorzy:: Zastempowski, B.
Domanowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/2071522.pdf
Data publikacji:: 2011
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: zawór
przecieki
valve
leaks
Opis:: W napędach płynowych stosowanych w przemyśle spożywczym najkorzystniejszą cieczką robocząjest woda. Czysta woda jest idealnym medium spełniającym warunki higieniczno-sanitarne. W związku z małą lepkością wody ważnym zagadnieniem jest ocena przecieków wewnętrznych przez zawory hydrauliczne. W artykule przedstawiona została pośrednia metoda pomiarów mikro-przecieków.
Water is the best working liquid for fluid drives used in food industry. Clean water is ideal medium which meets sanitary-hygienic conditions. Due to low viscosity of water an important issue is to estimate the internal leakage of hydraulic valves. The paper presents an indirect method of measuring such micro-leaks.
Źródło:: Inżynieria i Aparatura Chemiczna; 2011, 3; 93-94
0368-0827
Pojawia się w:: Inżynieria i Aparatura Chemiczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Badania zaworu kulowego zintegrowanego z kryzowym systemem pomiarowym
Tests of a Ball Valve Integrated with the Orifice Measuring System
Autorzy:: Matysko, R.
Lackowski, M.
Krzemiński, E.
Powiązania:: https://bibliotekanauki.pl/articles/1813735.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: zawór kulowy
kryza wielootworowa
charakterystyka zaworu
spadek ciśnienia na zaworze
ball valve
multi-hole orifice
valve characteristics
valve pressure drop
Opis:: W artykule opisano nową konstrukcję zaworu kulowego zintegrowanego z kryzą pomiarową wielootworową. Innowacyjna konstrukcja tego zaworu pozwala albo na odcinanie przepływu albo pomiar strumienia objętości przepływającego płynu (biogaz, powietrze). W artykule przedstawiono metodykę określania wartości wydatku objętościowego oraz współczynnika wymiarowego KV zaworu zintegrowanego z kryzą pomiarową wielootworową. Przedstawiono również wyniki badań oraz obliczeń wartości wydatku objętościowego uzyskanego z zaworu zintegrowanego z kryzami wielootworowymi. Zbadano stabilność pomiaru wydatku objętościowego w odniesieniu do wartości referencyjnej. Porównano stabilność pomiaru wydatku dla kryzy wielootworowej oraz jednootworowej zainstalowanej w zaworze. Określono KV tego zaworu z zainstalowaną oryginalną kryzą wielootworową. Proponowane rozwiązanie zaworu z systemem pomiarowym może być implementowane w instalacjach biogazowych oczyszczalni ścieków zarówno do pomiaru jak i odcinania przepływu biogazu.
This paper describes a new design of a ball valve integrated with multi-hole measuring orifice. The innovative design of this valve allows simultaneous cutting off the flow or measuring volumetric flow rate of the fluid (air) flowing through. The article presents methodology for determining the value of the volumetric flow rate and dimension factor of the valve integrated with multi-hole measuring orifice. It shows also research and calculations results of volumetric flow rate values obtained from the valve integrated with multi-hole measuring orifices. Stability of the volumetric flow rate measurement in relation to the reference value was examined. Stability of the volumetric flow rate measurement for the multi-hole and single-hole measuring orifices installed in the valve was compared. of the valve with installed original multi-hole measuring orifice was determined. The proposed solution of a valve with a measuring system can be implemented in biogas installations of sewage treatment plants for both measuring and shutting off biogas flow.
Źródło:: Rocznik Ochrona Środowiska; 2018, Tom 20, cz. 2; 1727-1745
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Motion properties of hydraulically actuated valve train
Właściwości ruchu zaworu rozrządu wymuszanego hydraulicznie
Autorzy:: Zbierski, K.
Smoczyński, M.
Powiązania:: https://bibliotekanauki.pl/articles/245787.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: silniki spalinowe
rozrząd hydrauliczny
rozrząd bezkrzywkowy
zmienne fazy rozrządu
combustion engine
hydraulic valve timing
camless valve timing
variable valve timing
Opis:: This paper shows motion properties of hydraulically actuated engine valve train. The experimental model of the hydraulic valve drive is to be presented in this paper. It consists of parts: engine valve, hydraulic actuator and electric control hydraulic distributor, which control the flow of supply oil to the hydraulic actuator. It is hydraulic single-acting drive for valves of internal combustion engines. The methodology of the experimental research is to be explained. The measurements of the valve movement for the different supply pressures and for different opening distributor times were realized in this research. The recorded valve motion was base to detail analysis of velocity and acceleration of the engine valve motion. The researches show possibility of short opening time for typical valve of the high-speed internat combustion engine. Called attention to high speed and stroke against seat, while valve is closing. Especially called attention to possibility to formatting of the course of the valve lift. It may be used for better load exchange in internal combustion engines. The paper points out on the power supply of the system with the working pressure about 15 MPa what gives: smaller delay movement of the timing valve, quicker its opening, and also the large value of stroke of the timing valve.
W artykule opisano właściwości ruchu zaworu rozrządu wymuszanego hydraulicznie. Zaprezentowano model doświadczalny składający się z zaworu rozrządu, siłownika hydraulicznego i rozdzielacza sterującego przepływem oleju zasilającego siłownik hydrauliczny. Jest to model hydraulicznego napędu zaworu jednostronnego działania. Uzasadniono przyjętą metodykę badań oraz przeprowadzono pomiary przebiegów wzniosu zaworu przy różnych wartościach ciśnień zasilających siłownik hydrauliczny i różnych czasach otwarcia rozdzielacza. W oparciu o zarejestrowane przebiegi wzniosów zaworu przeprowadzono szczegółową analizę prędkości i przyspieszeń zaworu. Pokazano możliwość uzyskania krótkiego czasu otwarcia dla typowego zaworu szybkoobrotowego silnika spalinowego. Zwrócono uwagę na dużą prędkość i uderzenie zaworu o gniazdo w chwili jego zamykania. Zwrócono także uwagę na stosunkowo dużą możliwość kształtowania krzywej wzniosu. Może zostać ona wykorzystana dla polepszenia wymiany ładunku w tłokowych silnikach spalinowych. Artykuł zwraca uwagę na zasilaniu układu ciśnieniem roboczym o wartości około 15 MPa, co daje: mniejsze opóźnienie ruchu zaworu rozrządu, szybsze jego otwieranie, a także dużą wartość skoku zaworu rozrządu.
Źródło:: Journal of KONES; 2009, 16, 3; 517-526
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Control of fiat multiair valve-lift system using atmega microcontroller
Autorzy:: Racewicz, S.
Olejnik, A.
Powiązania:: https://bibliotekanauki.pl/articles/242931.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: Fiat MultiAir system
valve-lift system
variable valve timing
open motor controller
Opis:: The article presents a device based on the ATmega microcontroller for precise Fiat MultiAir valve-lift system control. The Fiat MultiAir system is the patented electromechanical actuation system of the inlet valves. It allows a control of the inlet valves open time for each combustion chamber independently. The described device has been installed in the Fiat 0.9 TwinAir CNG 80 HP internal combustion engine controlled by the ECU Master open motor controller. As the ECU Master Controller software and hardware does not support Fiat’s MultiAir system control, the above-mentioned device had to be designed. The device consists of the ATmega88 microcontroller, which analyses the signals from the shaft and the cam sensors. Then, the DC converter is powering the solenoid valves of the MultiAir system via two transistors. When the solenoid valve is closed, the incompressible hydraulic fluid transmits the inletcam lobe’s motion to the valve as in a traditional engine. When the solenoid valve is open, the oil bypasses the passage, decoupling the valve, which then closes conventionally via spring pressure. In order to find the specific moments of turning the solenoids on and off the measurements on the original Fiat motor controller have been performed. The acquired oscillograms have been analysed and presented in the article. Studied Fiat 0.9 TwinAir engine is a part of the power generation unit and has been coupled with the three-phase electric power generator MeccAlte 16 kW with an AC exciter.
Źródło:: Journal of KONES; 2017, 24, 3; 229-236
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: An analysis of the impact of valve closure time on the course of water hammer
Autorzy:: Kodura, A.
Powiązania:: https://bibliotekanauki.pl/articles/240994.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:: time of valve closure
butterfly valve
pressure characteristic
transient flow
water hammer
Opis:: The knowledge of transient flow in pressure pipelines is very important for the designing and describing of pressure networks. The water hammer is the most common example of transient flow in pressure pipelines. During this phenomenon, the transformation of kinetic energy into pressure energy causes significant changes in pressure, which can lead to serious problems in the management of pressure networks. The phenomenon is very complex, and a large number of different factors influence its course. In the case of a water hammer caused by valve closing, the characteristic of gate closure is one of the most important factors. However, this factor is rarely investigated. In this paper, the results of physical experiments with water hammer in steel and PE pipelines are described and analyzed. For each water hammer, characteristics of pressure change and valve closing were recorded. The measurements were compared with the results of calculations perfomed by common methods used by engineers – Michaud’s equation and Wood and Jones’s method. The comparison revealed very significant differences between the results of calculations and the results of experiments. In addition, it was shown that, the characteristic of butterfly valve closure has a significant influence on water hammer, which should be taken into account in analyzing this phenomenon. Comparison of the results of experiments with the results of calculations? may lead to new, improved calculation methods and to new methods to describe transient flow.
Źródło:: Archives of Hydro-Engineering and Environmental Mechanics; 2016, 63, 1; 35-45
1231-3726
Pojawia się w:: Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:: Biblioteka Nauki

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