Temat: pistons - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Preliminary research no vel composite materials with small hysteresis and high functional parameters for combustion engines pistons
Autorzy:: Siemińska-Jankowska, B.
Powiązania:: https://bibliotekanauki.pl/articles/246073.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
engine pistons
thermal expansion
hysteresis
Opis:: Pistons of internal-combustion engines are the most loaded elements of internal-combustion engines, belong to these specialistic elements, which have essential influence on the ecological properties of engines, their durability and reliability. The object of paper is pistons manufactured from the standard material and from new research alloy. The investigations were performed with dilatometer permitting on the registration of changes of the dimensions of sample in the function of temperature and time. The measurements are possible in straight system and in differential system. Exemplary results of investigations are presented in the paper. During the piston heating, period preutectic phases succumb the partial dissolution in solid solution a, but in the cooling process they secrete again. As a consequence the piston partial deformation occurs, which by result is gradual growth of difference between its expansibility during the warming and contraction in the process of cooling (so-called hysteresis occurs). The characteristics of the new piston silumin alloys give possibility of dearances minimalization and the obtainments of a correct engine performance in the full range of engine rotational velocities and loads. The effect are the decrease of the oil expenditure, the decrease of the emission of hydrocarbons in exhaust gases, the decrease of blowbys to crankcase, the decrease of the expenditure of piston rings grooves wear and the piston skirt wear, the decrease of the piston deformation and the increase of engine durability and reliability.
Źródło:: Journal of KONES; 2009, 16, 1; 447-452
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The stress analysis of high loaded diesel engine piston
Autorzy:: Cupiał, K.
Sobiepański, M.
Powiązania:: https://bibliotekanauki.pl/articles/247526.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: pistons
internal combustion engines
numerical analysis
stresses
Opis:: Modern diesel engines reach high power out put per volume unit. This is the main reason, why modern passenger cars and other medium size vehicles are powered by those engines. It is very important to keep reliability, characteristic for past generations of diesel engines. It is a difficult task, because of higher thermal loading of engine parts, especially pistons. Typical fuel injection systems are now, almost all, high pressure, common-rail systems. Modern common-rail injectors are situated centrally between valves, and are manufactured as minimum six nozzle injectors. Combustion chamber is made in piston crown. This is the highest thermal loaded part of whole engine. Injected fuel starts to burn when piston is near to TDC position. Flame acts piston surfaces, what can be proven by inspection of piston with help of endoscope, or after removing engine head. The thermal load of piston crown is not uniform, due to not uniform conditions of heat transfer at piston crown surface. Part of piston crown reaches higher temperature due to direct flame acting. Authors present results of numerical simulations, which were done to check how stresses in piston depend on injector position and temperature distribution in piston materiał. The results of calculations indicate, that injector should not to be situated randomly. If nozzles of injector are situated in such way, that burningfuel sprays acts piston in the piston pin plane, stresses in hub of piston pin and piston crown increase significantly. That can decrease reliability of engine due to piston failure. Authors indicate, that thermal load is the most dangerous for piston of modern, common-rail diesel engines. Load caused by mass forces and pressure are less important when temperature of some regions of piston is above 320°C.
Źródło:: Journal of KONES; 2010, 17, 4; 109-116
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Properties of novel composite alloys used for the engine pistons
Autorzy:: Kowalski, M.
Jankowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/949489.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: novel composite alloys
engine pistons
thermal derivative analysis
Opis:: The article presents the results of the investigations cover novel composite silumins with new alloying additives, such as chromium and molybdenum (not yet used in this type of silumin) and increased content of nickel and copper. The samples strength tests were performed at room temperature (20°C) and at elevated temperatures (up to 350°C), and were carried out using the strength machine, equipped with the special climate chamber. The dimensional stability of the new aluminum alloy was investigated using the precision dilatometer. This device allows one to register and record the sample dimensions as a function of temperature, during sample heating and cooling. During the DTA crystallization process investigations, derivative curves have been determined, that allows the analysis of the solidification process and the analysis of the heat transfer process in the sample structure and phase transformations. In the article shows the derivative curve and representative microstructures, and characteristic temperatures for the conventional AlSi12 alloy and novel composite alloy. All research results indicated that the newly developed composite aluminum alloy has far better parameters than aluminum alloys used previously for pistons of the internal combustion engines. This article concludes with a summary of the advantages of the new composite alloys.
Źródło:: Journal of KONES; 2017, 24, 4; 109-116
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Badania wstępne możliwości oceny stanu technicznego układów cylindrowych silnika na podstawie analizy procesu sprężania
Preliminary tests able to assess the condition of the engine cylinder layouts based on the analysis of the compression process
Autorzy:: Łutowicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/222374.pdf
Data publikacji:: 2004
Wydawca:: Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:: sprężarka
silnik turbinowy
tłoki
compressor
turbine engine
pistons
Opis:: W niniejszym opracowaniu przedstawiono koncepcję obróbki wykresów indykatorowych polegającą na dopasowaniu modelu procesu sprężania do zarejestrowanego przebiegu ciśnienia wewnątrzcylindrowego tłokowego silnika spalinowego. W procesie dopasowania modelu można odtworzyć nieznane lub niepewne parametry wejściowe dla tego modelu, które doprecyzują jakość stawianej diagnozy o stanie technicznym przestrzeni roboczych silnika pod względem jakościowym i ilościowym.
The paper presents an initial concept of processing indicator diagrams which consists in matching the compression process model to the recorded inside-cylinder pressure distribution in an internal combustion engine. In the model matching process it is possible to recreate unknown or uncertain input parameters for this model, which particularize the quality of the diagnosis related to the technical condition of the working spaces in the engine with respect to quality and quantity.
Źródło:: Zeszyty Naukowe Akademii Marynarki Wojennej; 2004, R. 45 nr 2 (157), 2 (157); 97-107
0860-889X
Pojawia się w:: Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Wieloparametrowy model przebiegu ciśnienia sprężania w cylindrze silnika okrętowego
Multiparameter model of the course of compression pressure in the cylinder marine engine
Autorzy:: Polanowski, S.
Powiązania:: https://bibliotekanauki.pl/articles/222522.pdf
Data publikacji:: 2005
Wydawca:: Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:: silniki okrętowe
tłoki
sprężarki
marine engines
pistons
compressor
Opis:: W modelu procesu sprężania bazującym na modelu politropowym zastosowano zmienny wykładnik w postaci wielomianu potęgowego, gdzie argumentem jest bezwymiarowa droga tłoka. Do modelu wprowadzono parametry konstrukcyjne, regulacyjne i eksploatacyjne silnika, wielkości wynikające ze zużycia cylindra oraz błąd położenia GMP tłoka i błędy transformacji osi czasu do osi kąta obrotu wału korbowego. Na przykładzie aproksymacji rzeczywistych wykresów indykatorowych silników okrętowych metodą najmniejszych kwadratów i metodami teorii eksperymentu pokazano właściwości modelu i możliwości jego wykorzystania do pozyskiwania informacji pomiarowej i diagnostycznej z wykresów indykatorowych.
In the compression model based on politropic model used was the variable index in the form of power multinominal, where the argument is constituted by nondimensional piston path. The following were introduced into the model: design, regulatory, and operation parameters, the magnitudes resulting from the cylinder wear, and the error in piston GPM position, and errors in transformation on the time axis in relation to the axis of crankshaft revolution angle. Approximation of real indicator diagram for marine engines with the least square method and experiment theory methods was used to show the properties of the model and the possibilities of employing it to obtain measurement and diagnostic information from indicator diagrams.
Źródło:: Zeszyty Naukowe Akademii Marynarki Wojennej; 2005, R. 46 nr 1 (160), 1 (160); 109-130
0860-889X
Pojawia się w:: Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Composite alloy for IC engine pistons
Autorzy:: Jankowska-Sieminska, B.
Jankowski, A.
Sławinski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/246922.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
engine pistons
composite alloys
thermal analysis
Opis:: Aluminum is the most popular matrix for the metal matrix composites The Al alloys are attractive due to their low density, their capability to be strengthened by precipitation, their good corrosion resistance, high thermal and electrical conductivity, and their high damping capacity. The characteristics of metal matrix composite materials are determined by their microstructure and internal interfaces, which are affected by their production and thermal mechanical treatment. Investigations to improve the combustion piston engines arę leading to improve the working process performance by increase ofits parameters, especially the average temperature of the thermodynamic cycle. New piston consists of two parts manufactured of standard and composite materials are presented in the paper. Composite alloy has chemical composition of short fibre with Al2 O3 was following, in the mass percentage: 96% Al2 03, 4%, SiO2. As the binder the colloidal silica was used in quantity 5%. The volume of fibres in the insert was 22 plus or minus 2% by volume. Bending strength of the insert was 0.5 MPa. Temperature and stresses distribution in standard piston and different versions of composite pistons are introduced in the paper. The paper presents the resistance of investigated materials on thermal shocks. Experimental veriflcation of manufactured composite pistons in the engine proved the larger exhaust temperaturę for about 20-70°C, in comparison with the engine with standard pistons (that gives the greater effectiveness of turbo charging application), proved the lowering of a individual volume of gases blow-bys to the crankcase, the lowering of noise level, larger resistance on thermal loads.
Źródło:: Journal of KONES; 2010, 17, 2; 159-166
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Researches novel materials on the pistons with low hysteresis to combustion engines
Autorzy:: Sieminska, B.
Slawinski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/243012.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
engine pistons
composite alloy
thermal expansion
hysteresis
Opis:: The researches were carried out at the use of the precise dilatometer of the firm BAHR 802/801. The device makes possible the registration of changes of measurements of the sample in the function of the temperature. Measurements in the simpler and differential are possible. Heating and cooling is performed in the special device, which realizes the programme temperature, controlled computer. Changes of dimensions are measured with an inductive sensor. Samples were placed in the quartz-pipe and changes of their length were transferred by quartz-rods. The temperature of tested material was measured by means of the Pt-PtRh thermocouple. Material on the pistons has a fundamental meaning for the value of the clearances between the cylinder and the piston. Too small clearness between the piston and cylinder on the cold engine cannot be applying, because during the work of an engine it would be able to occur seizing of an engine. From here, also the large resistance on seizing of material of the piston is essential. Investigated composite materials performed based on piston-silumins AK12 and AK18 in which a composite addition was silicon carbide (SiC) and ferric sulphide (FeS).
Źródło:: Journal of KONES; 2012, 19, 4; 549-554
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Coefficient of thermal expansion as a component quality estimation of alloys on pistons of combustion engines
Autorzy:: Sieminska, B.
Powiązania:: https://bibliotekanauki.pl/articles/245892.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
engine pistons
thermal expansion
coefficient of thermal expansion
Opis:: The aim of realized works in the area of materials on pistons is: low thermal expansion, small differences of coefficient of thermal expansion between heating and cooling, high stiffness at elevated temperatures, high hardness and wear resistance. Changes in thermal expansion coefficient during heating and cooling may be very large, as well as during subsequent cycles of heating and cooling of an internal combustion engine pis ton with respect to standard silumin alloys usedfor pistons of internal combustion engines. The paper presents: coefficient of linear expansion a for the AlSi standard alloy, coefficient of linear expansion a for the AlSi alloy with the apositive differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the a negative differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the apositive and negative differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the apositive, negative and positive differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the very small a differences between cooling and heating, coefficient relative elongation as afunction of temperature with the positive elongation differences between cooling and heating, coefficient relative elongation with the very small elongation differences between cooling and heating, coefficient the course of derivative as a function of temperature (T) during heating and cooling with the positive elongation differences.
Źródło:: Journal of KONES; 2009, 16, 4; 575-583
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Investigations of strength, thermal expansion and engine of novel pistons for combustion engines
Autorzy:: Siemińska, B.
Powiązania:: https://bibliotekanauki.pl/articles/243623.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
engine pistons
novel alloys
novel materials
thermal expansion
Opis:: Pistons of internal-combustion engines work in the conditions of high mechanical and thermal loads. The typical alloy materials applied on pistons of internal-combustion engines have inadequate parameters for such applications. It mainly refers to the fatigue strength of the mechanical and thermal character and to the thermal shocks. In relation with fact that the piston of internal-combustion engine has unsymmetrical shape, that in every case of the piston temperature increase the unequal deformations appear and stresses related with this, what causes fatigue loads of the piston structure. The paper presents special demands, which pistons of contemporary of internal-combustion engines must fulfil with respect to strength, thermal and useful properties, mirrored in the engine work parameters, like engine oil consumption, fuel consumption, noise, gas blow by to the crankcase and the emission of toxic exhaust elements, mainly hydrocarbons. One turned attention on the new material that can be used in manufacture of pistons for the internal-combustion engines, which is the carbon material. In the article the results of research for the mechanical, thermal and engine properties are submitted for the pistons manufactured from a new material. On the emphasis deserve fact, that the application of new materials permits on the obtainment of the small difference in the coefficient of linear thermal expansion during the heating and the cooling, that will bring many profitable effects of both functional and useful nature.
Źródło:: Journal of KONES; 2008, 15, 3; 471-478
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Different types of power transforming machines with rotating pistons
Autorzy:: Drogosz, P.
Powiązania:: https://bibliotekanauki.pl/articles/248159.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: power transforming machines
rotating pistons
internal combustion engines
pumps
hydraulic engines
Opis:: This article describes the basic principles for determining the geometry of different types of power transforming machines with rotating pistons. Those machines can be used as internal combustion engines, pumps, hydraulic engines, compressors, flowmeters, feeders etc. An attempt is made to clarify whether it is possible to construct machines with rotating pistons for more general use. Differences in description in many sources lead to problems when it comes to comparison of information coming from these sources. An analysis of the data indicates that reorganizing the basic mathematical issues would be useful. In this article we choose and describe one most convenient name and form of mathematical equation. Many other applications of the chosen form of mathematical equation ascertain proper and convenient use. This is the first time that the chosen form of mathematical equation is proposed to be used to find constructions of different types of power transforming machines with rotating pistons. The main advantage of this form of mathematical equation is the application of two main parameters: curve size parameter and dimensionless curve parameter. These two parameters decided about the convenience in changing volume of internal combustion engines and comparisons of performance characteristic of different types of power transforming machines with rotating pistons. In this paper some convenient values of parameters dimensionless curve parameter are put and discussed.
Źródło:: Journal of KONES; 2012, 19, 1; 79-82
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: The method of measurement of thermal deformation piston. Analysis of measurement error
Metoda pomiaru odkształceń cieplnych tłoka. Analiza błędu pomiaru
Autorzy:: Mitukiewicz, G.
Pawelski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/1365080.pdf
Data publikacji:: 2011
Wydawca:: Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:: amortyzator pneumatyczny
odzysk energii
turbogenerator
internal combustion engines
pistons
thermal loading
Opis:: At the Department of Vehicle and Fundamentals of Mechanical Engineering of Technical University of Lodz the test rig was built to measure the thermal deformation of the piston. The article shows how to measure thermal deformations of the piston on this rig. For the measurement were used laser sensors for distance measurement, which measure the distance from the object to the sensor with a resolution of 4[mu]m. The piston expands during heating and it resuting as a reduction in the distance between the sensor and the piston. The changes of geometric dimensions of the piston was determined using the geometrical dependence. The temperature of the piston was measured with 4 thermocouples placed near the piston crown. Distance measurements were mesured simultaneously on two axes: the Axis perpendicular to the crown. Distance measurements were mesured simultaneously on two axes: the axis perpendicular to the axis of piston pin and the piston pin axis. A research position with the burner used to heat the piston and the temperature stabilization system were described. Specially designed burner was powered by propane gas. To ensure proper conditions for combustion of gas in addition to the mixer is fed compressed air. By adjusting the expense of gas and air could affect on the flame temperature. Temperature stabilization system allowed to maintain a constant coolant temperature of 62 [degrees]C. In the second part of the article presents the analysis undertaken, the systematic error of measurement and statistical processing of the preliminary results of measurements on this test rig.
W artykule dokonano oceny możliwości odzyskiwania części energii drgań pojazdu. Jedną z potencjalnych możliwości, jest wykorzystanie ciśnienia płynu w amortyzatorze do napędu turbogeneratora zasilającego akumulator. Interesujące wydaje się zastosowanie amortyzatorów pneumatycznych, z uwagi na możliwość bezpośredniego wyprowadzenia rozprężanego powietrza do atmosfery - co może ułatwiać konstrukcje układu odzyskującego energię. Celem przedstawianych w artykule badań jest ocena możliwości odzyskania energii z amortyzatora pneumatycznego, bez pogarszania poziomu tłumaczenia drgań, jaki zapewniają amortyzatory hydrauliczne. W artykule zamieszczono schemat proponowanego amortyzatora pneumatycznego, jego model matematyczny, wyniki obliczeń narastania ciśnienia w amortyzatorze w funkcji przemieszczenia jego tłoka, dla różnych prędkości tłoka. Porównano charakterystyki amortyzatorów: hydraulicznego i pneumatycznego z odzyskiwaniem energii. Zaprezentowano też model koła i związanej z nim masy samochodu. Przy użyciu tego modelu wykonano symulacje ruchu koła i masy samochodu dla zadanej prędkości ruchu pojazdu. Opracowano także model nierówności drogi. Przy pomocy wspomnianych modeli obliczono energię odzyskiwaną na drodze 1 km podczas ruchu pojazdu osobowego.
Źródło:: Archiwum Motoryzacji; 2011, 2; 41-58
1234-754X
2084-476X
Pojawia się w:: Archiwum Motoryzacji
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Researches of novel composite pistons for combustion engines
Autorzy:: Jankowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/247291.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
engine pistons
composite alloy
thermal expansion
hysteresis
engine test
Opis:: Novel composite material was worked out based on experiences and researches realized in the Institute of Aviation, the Lodz Technical University and PZL WOLA Company. Actually applied silumins on the pistons secure them high-quality for durability, low Rm and HB values at increased temperature, high hysteresis of the coefficient a during heating and cooling, high clearance between the piston and the cylinder, increased oil consumption, blowthrough and obtainment relatively low-power engine. Thereby works concerning elaborations of novel composite material based on the standard silumin with better from at present applied on the piston properties are presented. Novel composite material on the pistons has mechanical properties in the ambient temperature: Rm ≥ 400 MPa; Rp0.2 ≥ 330 MPa; A5 ≥ 3.5%; HB ≥ 130 and in the temperature 250°C: Rm ≥ 320 MPa; Rp0.2 ≥ 240 MPa; A5 ≥ 5%; HB ≥ 90. Metallographic and ATD researches, the researches of the hardness, the researches of Rm, Rp0.2 and A5, the researches of the coefficient of thermal expansion "α", engine researches were performed. Curves ATD and the microstructure the alloy are presented. Test results of the S12-U diesel engine engine are introduced too.
Źródło:: Journal of KONES; 2013, 20, 4; 141-146
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Comparative researches of lube oil consumptions engine WOLA S12-U with composite pistons
Autorzy:: Kołomecki, J.
Powiązania:: https://bibliotekanauki.pl/articles/241861.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
diesel engine
composite pistons
lube oil consumption
engine tests
Opis:: An object of the paper are test results of the lube oil consumption in reference to two versions of standard and novel pistons worked out within the framework of the project of developmental No. O R00 0052 05 under the title "The elaboration of the modern technology of composite materials of the novel generation to uses on the pistons of combustion engines to military uses". The project was coordinated by Institute of Aviation; a project manager was Antoni Jankowski. Unique properties, which are characterized by worked out novel material, mainly high hardness and strength, the low hysteresis and coefficient of thermal expansion ....create many novel opportunities. As one of essential evaluation criteria of the novel piston, is lube oil consumption what is the object of the paper. The researches of the pistons were performed in WOLA S12-U engine. Novel solution of the pistons lets on the optimization of the shape of the piston and decreasing of the clearances between piston and cylinder. This causes decreasing of the lube oil consumption, decreasing of blowthroughs to the crank case, decreasing of the noise level and the vibration and the emission level of harmful components of exhaust gases; the improvement of the durability and dependability of the work of the engine and the pistons; increasing of mechanical loads , the pressure increasing combustion , and to the same opportunities increasing of the engine power and the BSFC decreasing.
Źródło:: Journal of KONES; 2012, 19, 4; 315-320
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Does "downsizing" limit the durability of piston-cylinder assembly?
Czy "downsizing" ogranicza trwałość zespołu tłok - cylinder?
Autorzy:: Iskra, A.
Powiązania:: https://bibliotekanauki.pl/articles/247570.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: silnik spalinowy
tłok
film olejowy
downsizing
combustion engines
engine pistons
oil film
Opis:: Internal combustion engines purposed for passenger car drive are not perfect but there is no alternative drive yet that could replace IC engine in noticeable percentage. However, among IC engines there is a tough competition between two kinds of ignition. At present, a gasoline engine subjected to the "downsizing" [4] is the only alternative to very popular diesels. Such engine shows specific fuel consumption similar to diesel maintaining the principal advantages of spark engine. The fundamental advantage is generating the maximum torque at about 1500 rpm and keeping it up to 3500 rpm for an engine operating within 850 to 5000 rpm range. However, such advantageous characteristics of torque can cause a limited durability of the piston-cylinder assembly. High torque at low speed creates unfavourable conditions of collaboration between the upper compression ring and cylinder surface. Presented paper analyzes the oil film parameters between the upper compression ring and cylinder liner of ,"downsizing" engine and compares these parameters with analogue ones of a regular gasoline engine of comparable power. High ring to cylinder pressure caused by gaseous forces at low piston speed leads to two disadvantageous phenomena, namely the drop in oil film minimum thickness and an increase in friction force. The paper presents an analysis of both parameters and the assessment of their scale. A minor effect of "downsizing" on ring-cylinder friction power has been established, which is confirmed by the producers' data concerning fuel consumption [4].
Tłokowe silniki spalinowe napędzające samochody osobowe nie są rozwiązaniami idealnymi ale jak na razie nie istnieje konkurencyjny silnik, który mógłby zastąpić w zauważalnym procencie ten - niepozbawiony wad -rodzaj napędu. Istnieje natomiast ostra konkurencja między dwoma rodzajami zapłonu w tłokowych silnikach spalinowych. Aktualnie może ograniczyć ekspansję silników o zapłonie samoczynnym (ZS) silnik o zapłonie iskrowym (ZI) poddany procesowi tzw. "downsizing'u" [4]. Taki silnik wykazuje jednostkowe zużycie paliwa zbliżone do silnika ZS zachowując podstawowe zalety silnika ZI. Podstawowa zaleta to generowanie maksymalnego momentu obrotowego już od prędkości obrotowej ok. 1500 [obr/min] i utrzymywanie tego momentu do 3500 [obr/min] dla silnika pracującego w zakresie 850-5000 [obr/min]. Taka, bardzo korzystna charakterystyka momentu silnika wykorzystywanego do napędu samochodu, może jednak prowadzić do ograniczenia trwałości zespołu tłok cylinder. Duża wartość momentu przy niewielkiej prędkości obrotowej stwarza niekorzystne warunki współpracy górnego pierścienia uszczelniającego z gładzią cylindra. W artykule przeanalizowano parametry filmu olejowego między górnym pierścieniem uszczelniającym a gładzią cylindra silnika "downsizing'owanego" oraz porównano te parametry z analogicznymi parametrami klasycznego silnika ZI o zbliżonej mocy znamionowej. Duży nacisk pierścienia na gładź cylindra wywołany siłami gazowymi przy niewielkiej prędkości ruchu tłoka powoduje dwa niekorzystne zjawiska, a mianowicie zmniejsza się minimalna grubość filmu olejowego oraz zwiększa się siła tarcia. W artykule przeanalizowano oba parametry a zarazem oceniono skalę przytoczonych zjawisk. Potwierdzono niewielki wpływ "downsizing'u" na moc tarcia pierścieni o gładź cylindra, co potwierdzają dane producentów dotyczące zużycia paliwa [4].
Źródło:: Journal of KONES; 2008, 15, 3; 195-200
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Analyzing mechanical vibrations of an aircraft opposed piston engine
Autorzy:: Biały, Michał
Grabowski, Łukasz
Skórzyński, Bartłomiej
Barański, Grzegorz
Majczak, Adam
Powiązania:: https://bibliotekanauki.pl/articles/2097574.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:: DIAdem
mechanical vibrations
opposed pistons
PZL-100
vibroacoustics
drgania mechaniczne
tłoki przeciwstawne
wibroakustyka
Opis:: The paper presents the results of the bench tests to measure mechanical vibrations of a new aircraft opposed piston engine with reciprocating pistons. The PLZ-100 engine is a three-cylinder, six-piston, two-shaft drive unit with a two-stroke diesel cycle. This type of engine is dedicated for powering light aircraft, e.g. autogyros. The tests were carried out on a test bench at the Lublin University of Technology. The engine was loaded with constant torque, for several fixed values of rotational speed of a crankshaft. The angle of the start of diesel injection was changed for each of the rotational speeds. The mechanical vibrations that accompanied the operation of this drive unit were recorded with three measurement transducers and a National Instruments conditioning system. Each of the transducers was mounted on a different axis of the engine. The signals were analyzed from their diagrams with the DIAdem software. The results were the diagrams of effective speed and vibration acceleration to conduct a vibration-acoustic evaluation of the PLZ-100, detect and prevent various types of defects or failures.
Źródło:: Combustion Engines; 2021, 60, 4; 3--7
2300-9896
2658-1442
Pojawia się w:: Combustion Engines
Dostawca treści:: Biblioteka Nauki

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