Temat: engine system - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Aircraft engines : analysis of reported systems failures in Polish aviation during years 2008-2015
Autorzy:: Balicki, W.
Glowacki, P.
Tematy:: aircraft engine
failure
engine system
ATA chapter
safety system; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/243587.pdf Link otwiera się w nowym oknie
Opis:: Aircraft engine failure during different aircraft flight phases can cause accidents or incidents. ICAO Annex 19 requires from each state establishing the state safety program (SSP) and from the subordinate aviation organizations safety management system (SMS). Point 5.2.1 of Annex 19 instructs to establish safety database, which should be used for effective analysis of actual and potential safety deficiencies. Such analysis should lead to determining necessary measures in order to improve safety. Polish Civil Aviation Authority among other databases manages an important one called European Coordination Centre for Aviation Incident Reporting Systems (ECCAIRS). The authors have done a laborious processing of the data contained in that database analysing engine failures based on criteria like phases of flight, ATA chapters concerning powerplant and category of the occurrence. Separately, under consideration were taken engines installed on aircraft with an MTOM <5700 kg (mainly General Aviation) and for aircraft with MTOM > 5700 kg (commercial aviation). The article presents a proposed method of predicting the number of events, the alert levels for the next years and for ATA chapters’ determination, assuming a normal distribution (Gaussian). It is one of the first attempts to use the actual data contained in the database of events in Poland. The results of this analysis can support the decisions of supervisory authorities in the areas where security threats are most important.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Engine fuel characterisation through ultraviolet absorption spectra
Autorzy:: Baszanowska, E.
Otremba, Z.
Tematy:: fuel
spectroscopy
absorptivity
diesel engine system; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/245537.pdf Link otwiera się w nowym oknie
Opis:: In the article, light absorption properties of the fuel oil are considered with a view to create basis for establish optical indicator of the type and quality of this kind of crude oil derivative, in this case the Diesel fuel. The organic solvent – n-hexane – was chosen as a solvent to prepare samples of dilutions of Diesel fuel in several oil concentration. Spectrophotometer Aqualog Horiba were applied to record the absorbance spectra in the ultraviolet and visual range of the light (from 240 to 600 nm) for each previously prepared samples. Obtained results allow concluding that the changes of absorbance occur primarily in the wavelength range from 240 nm to 355 nm. Moreover, the absorbance spectra are characterized by the characteristic sharp peak located at 270 nm for excitation wavelength. Spectra of absorbance were converted to spectra of absorption coefficient based on Lambert-Beer law. Due to the independence the absorption coefficient from the fuel concentration, this parameter could be used as a potential indicator to access composition and quality Diesel fuel used in the diesel engine system. Therefore, preliminary tests allow concluding that absorption coefficient for selected wavelength located at 270 nm could be a sensitive indicator for quick access to fuel quality.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Light absorption spectra for lubricate oil quality tracking in the combustion engine
Autorzy:: Baszanowska, E.
Otremba, Z.
Tematy:: lubricate oil
dissolved oil
absorption spectroscopy
absorption coefficient
engine system; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/243648.pdf Link otwiera się w nowym oknie
Opis:: The important role in the proper functioning of combustion engines plays the quality of lubricates oil. However, the quality of oil changes with the time of exploitation. Therefore, several parameters for examination of oil quality were determined; however, the indicator for quick and efficient tracking of evolution of oil with exploitation time is still searched. Taking into account the complex composition of oils, the ability of oils components to absorb light in various wavelengths is considered. In the article absorption properties of oils is discussed in relation to the time of circulation of oil in the engine lubricate system. For this study, two lubricate oils designated to lubricate the cylinder of vessel engines with different brightness and transparency were used. Oil samples were dissolved in organic solvent –n-hexane and several oil concentration were prepared based on dilution method. Absorbance spectra for eachsamples of oil were registered in the range of wavelength 240-600 nm. Obtained results indicate the changes of value of absorbance in relation to the kind of oil; however, the shape of absorbance spectra is independent from the kind of oil. For studied kinds of oil, characteristic peak independent from the kind of oil located at 260 nm was determined. Based on Lambert-Beer law absorption coefficient was identified as a potential indicator to oil quality evaluation with the time of exploitation in the engine system. Preliminary test for two fresh lubricate oils allow to conclude that absorption coefficient for selected wavelength located at 260 nm could be a sensitive parameter for quick estimating the degree of deterioration of the oil in engine system.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The concept of an integrated laboratory control system for a dual - fuel diesel engine
Autorzy:: Śmieja, M.
Wierzbicki, S.
Tematy:: biogas
diesel engine
dual-fuel feed system
microprocessor engine control system; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246809.pdf Link otwiera się w nowym oknie
Opis:: The need to limit greenhouse gases emissions and to increase the share of renewable fuels in the general energy balance forces people to look for new alternative energy sources. Methane or biogas, in which methane is the main combustible component, is one of such fuels, which is believed to be a promising diesel engine fuel. It is worth emphasizing that biogas might be believed to be one of the cleanest fuels due to the fact that it can be produced from waste, which in normal conditions decomposes releasing methane into the atmosphere. Methane (biogas) combustion in diesel engines requires a dual-fuel feed system, in which the liquid fuel initiating auto-ignition will be injected into the combustion chamber. It comes as a consequence of a relatively high spontaneous combustion temperature of methane, which is not able to self-ignite in the chamber without an external source of ignition. This article presents a concept of constructing an integrated laboratory control system, which will provide optimal feed control of complex composition gaseous fuel and of the injection of an appropriate pilot dose of a liquid fuel into the combustion chamber. The solution proposed to control a dual-fuel diesel engine, which was mounted on the test bed, enables performing comprehensive diesel engine research, ensuring not only stable working conditions for the engine, but also granting an opportunity to smoothly regulate the composition of the artificial biogas which feeds the engine and to control basic parameters of the liquid fuel pilot dose.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Metodyka wyznaczania poziomu oleju w silniku spalinowym
The methodology for determining the level of oil in the internal combustion engine
Autorzy:: Suchecki, A.
Knefel, T.
Nowakowski, J.
Tematy:: silnik spalinowy
układ smarowania
internal combustion engine
engine lubrication system; Pokaż więcej
Wydawca:: Instytut Naukowo-Wydawniczy "SPATIUM"
Powiązania:: https://bibliotekanauki.pl/articles/314450.pdf Link otwiera się w nowym oknie
Opis:: W artykule przedstawiono sposób postępowania umożliwiający przeprowadzenia doboru odpowiednich, bezpiecznych dla pracy silnika poziomów oleju w misce olejowej oraz określenie ich wpływu na parametry pracy silnika. Przeanalizowano również możliwość pracy silnika w przechyłach wzdłużnych i poprzecznych w stosunku do osi pojazdu, w celu określenia zakresu kątów, dla których nastąpi zassanie oleju na stronę dolotową silnika. Ponadto, w oparciu o uzyskane wyniki, podjęto próbę wskazania najbardziej optymalnego poziomu oleju w misce olejowej silnika spalinowego.
In this article the methodology for determining the appropriate volume of oil in the sump and its influence on the operation of the engine is described. Also examined the possibility of operating the engine in the heel and transverse to the longitudinal axis of the vehicle, in order to determine the range of angles for which the oil will be sucked towards the inlet of the engine. Further, based on the obtained results, it was attempted to identify the most optimum level of the oil sump of the internal combustion engine.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Material consumption criteria of piston – con – rod elements system of combustion engine
Autorzy:: Rosłanowski, J.
Charchalis, A.
Tematy:: criteria of mechanical and thermal load of the engine
tribological criteria of piston-crank combustion
engine system; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246321.pdf Link otwiera się w nowym oknie
Opis:: The following article includes the analysis of mechanical and thermal load criteria of combustion engine. Those criteria have been divided into tribological, technical in detail and technical in general. The above criteria have been related to piston-con-rod system, in which, two tribological centres were specified. One centre included, piston-piston rings and cylinder, in which, piston rings serve as labyrinth seal and the cylinder constitutes piston guides. Crank bearings and main bearings of engine crankshaft constitute the second centre. From the point of tribological view, piston-piston rings and cylinder constitute slide and thrust bearing lubricated hydrodynamically, while crankshaft bearings a-c-t as slide and journal bearings also lubricated hydrodynamically. In the description of thermal load of the above-mentioned tribological centres, special attention was paid to criteria that ensure their motion reliability and durability of engine operation. Whereas in the description of mechanical load of elements constituting investigated centres, some criteria were determined resulting from their functionality and fatigue strength of the material they were made of. Criteria of thermal loads were based on mean density flux of heat conducted through the walls of engine elements, paying attention to their low precision of evaluation. It has been emphasized that synthetic criteria indicators are the most precise. They are determined on the basis of engine load measurements during its operation. Those criteria allow us to describe the operating process of con-rod-piston diesel engines and at the same time it is possible to expose their technical condition which is of essential practical meaning. The wear process of tribological centres that takes place during operating in piston-con-rod system, affects the course of engine working process and its techno-economic indicators.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Evaluation of operation in piston–con–rod system of ship propulsion engine on the basis of harmonic torque
Autorzy:: Rosłanowski, J.
Charchalis, A.
Tematy:: criteria of mechanical and thermal load of the engine
tribological criteria of piston-crank combustion
engine system; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247247.pdf Link otwiera się w nowym oknie
Opis:: The following article includes the analysis of mechanical and thermal load criteria of combustion engine. Those criteria have been divided into tribological, technical in detail and technical in general. The above criteria have been related to piston-con-rod system, in which, two tribological centres were specified. One centre included, piston-piston rings and cylinder, in which, piston rings serve as labyrinth seal and the cylinder constitutes piston guides. Crank bearings and main bearings of engine crankshaft constitute the second centre. From the point of tribological view, piston-piston rings and cylinder constitute slide and thrust bearing lubricated hydrodynamically, while crankshaft bearings a-c-t as slide and journal bearings also lubricated hydrodynamically. In the description of thermal load of the above-mentioned tribological centres, special attention was paid to criteria that ensure their motion reliability and durability of engine operation. Whereas in the description of mechanical load of elements constituting investigated centres, some criteria were determined resulting from their functionality and fatigue strength of the material they were made of. Criteria of thermal loads were based on mean density flux of heat conducted through the walls of engine elements, paying attention to their low precision of evaluation. It has been emphasized that synthetic criteria indicators are the most precise. They are determined on the basis of engine load measurements during its operation. Those criteria allow us to describe the operating process of con-rod-piston diesel engines and at the same time it is possible to expose their technical condition which is of essential practical meaning. The wear process of tribological centres that takes place during operating in piston-con-rod system, affects the course of engine working process and its techno-economic indicators.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Tendencje rozwojowe układów chłodzenia silników samochodowych
Development trends of automotive engine cooling systems
Autorzy:: Kneba, Z.
Tematy:: układ chłodzenia silnika
sterowanie układem chłodzenia
engine cooling system
cooling system control; Pokaż więcej
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Powiązania:: https://bibliotekanauki.pl/articles/133214.pdf Link otwiera się w nowym oknie
Opis:: Dzięki daleko idącym modyfikacjom układów zasilania i zapłonu silników samochodowych oraz udoskonaleniom układów oczyszczania spalin uzyskano znaczne zmniejszenie emisji związków toksycznych. Układy chłodzenia z pompą cieczy napędzaną mechanicznie stają się archaiczne nie pozwalając na swobodne sterowanie obiegiem cieczy. Również różna wartość temperatury potrzebnej do schładzania różnych procesów wymaga sterowanych zaworów trójdrożnych . Artykuł opisuje sterowanie elektroniczne obecnie wprowadzane do układów chłodzenia.
The far-reaching modifications power systems and ignition automobile engines and aftertreatment improvements achieved significant reduction in toxic emissions. Cooling fluid pump driven mechanically become archaic not allowing the free circulation of fluid control. Also, various temperature levels needed for different cooling processes require controlled three-way valve. The article describes the electronic control currently introduced into the cooling system.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Possibilities of lowering coolant pump driving power in car engines
Możliwości zmniejszenia mocy potrzebnej do napędu pompy cieczy chłodzącej silnika samochodowego
Autorzy:: Kneba, Z.
Tematy:: układ chłodzenia silnika
pompa cieczy chłodzącej
engine cooling system
coolant pump; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247524.pdf Link otwiera się w nowym oknie
Opis:: W artykule opisano wybrane problemy napędu pompy cieczy chłodzącej silnika samochodowego. Celem prezentowanego artykułu jest określenie możliwości zmniejszenia mocy potrzebnej do napędu pompy cieczy chłodzącej. W klasycznym i dzisiaj najbardziej rozpowszechnionym układzie chłodzenia cieczą silników samochodowych pompa cieczy chłodzącej jest napędzana przez przekładnię pasową od wału korbowego silnika. W tradycyjnych układach chłodzenia wydajność pompy jest zbyt duża przy wysokich prędkościach obrotowych silnika. Zmniejszenie prędkości obrotowej wirnika pompy jest korzystne ze względu na mniejszy pobór mocy do napędu jak i na unikanie kawitacji przy dużych prędkościach przepływu cieczy. Pełną niezależność wydajności pompy od prędkości obrotowej wału korbowego można osiągnąć tylko stosując dodatkowy silnik elektryczny czy hydrauliczny do napędu pompy. Takie rozwiązania pojawiły się 5 lat temu w silnikach samochodów osobowych a były i są powszechnie stosowane w silnikach okrętowych. Dla zapewnienia bezawaryjnej pracy konieczne jest sterowanie wydajnością pompy w funkcji wybranej łatwo mierzalnej temperatury części silnika na przykład tulei cylindrowej. Mierząc temperaturę tulei cylindrowych autor proponuje obniżenie wydajności pompy dla zmniejszenia mocy potrzebnej do jej napędu. Wśród różnych koncepcji technicznej realizacji zmniejszenia mocy potrzebnej do napędu pompy korzystnie wyróżnia się napęd niezależny z silnikiem elektrycznym. Jest to rozwiązanie najbardziej kosztowne.
Some engine coolant pump drive problems are described in the paper. Presented aim of article is the presentation of possibilities to the decrease of the necessary power to drive the liquid cooling pump. In the classical and today most widespread in the car engines liquid cooling system, the pump of cooling liquid is driven through rubber belt from engine crankshaft. Due to recent applications of the new generation cooling systems, many simulations and engine measurements have to be done. Coolant pump velocity is too big at high engine speeds in traditional cooling systems. The speed decrease of the circulation pump rotor is advantageous, considering the smaller power consumption to pump drive and on the avoidance of cavitation related with the large velocities of liquid flow. The full independence of the pump output from of crankshaft rotational speed is only possible to achieve by applying the additional electric engine or hydraulic drive to power the pump. Such solutions appeared 5 years ago in the personal vehicle engines, but generally they were and are currently used in ship's engines only. For the assurance of a failure-free engine performance, the necessary task is the control of pump output in the function of a selected easily mensurable temperature of the engine parts, for example cylinder liner. Having knowledge of cylinder liner extreme temperature the author proposed lowering coolant pump rotational speed. Among different ideas of a technical realization of the decrease of necessary power to drive the coolant pump, the advantageous and favoured one is the independent pump propulsion with electric engine. This solution is the most expensive one.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The concept of a new refrigerant in combustion engines in aspect of the requirements of modern drive systems
Autorzy:: Szramowiat, Mateusz
Tematy:: combustion engine
engine cooling system
electromagnetic pump
silnik spalinowy
układ chłodzenia silnika
pompa elektromagnetyczna; Pokaż więcej
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Powiązania:: https://bibliotekanauki.pl/articles/132930.pdf Link otwiera się w nowym oknie
Opis:: The article presents currently applied construction solutions for currently used cooling systems for internal combustion engines. There were presented their defects and possible development directions were indicated. On this basis the concept of a cooling system which will enable the improvement of heat exchange in the internal combustion engine has been proposed.
Dostawca treści:: Biblioteka Nauki

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