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Tytuł:
The effect of location on the combustion chamber for the toxicity exhaust in self-ignition engine Ursus 4390
Autorzy:
Kalina, P.
Powiązania:
https://bibliotekanauki.pl/articles/247388.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
piston engine
diesel
combustion chamber
Opis:
As a part of the research work done on the engine URSUS 4390 which aimed at increasing power while reducing exhaust gas emissions, intake channels in the head, shape of the combustion chamber and compression ratio were modified. Proper injection equipment was selected and atomizer nozzles were constructed. In the first phase of the research, toroidal combustion chamber was located in factory design location. In the article there are presented results of exhaust gas emissions in selected operating points of engine URSUS 4390 for various positions of experimental combustion chamber. An innovative method of changing the position of the combustion chamber related to the piston axis was developed. A rotating insert with eccentrically extruded combustion chamber was mounted in piston axis. Rotation of the insert by a given angle resulted in displacement of combustion chamber around the axis of rotation. For each particular position of combustion chamber, concentration of toxic flue gas components and smoke index was measured at full load with rotational speed of 1400 and 2000 rpm. Proposed piston construction with rotating insert allowed to significantly decreasing duration of the research, which aimed at verification of combustion chamber relative location to injector and inlet nozzle. This way the necessity of construction of new sets of pistons and lapping them each time was avoided. As a result of the work, 11 locations of combustion chamber were tested. The study allowed picking the position of combustion chamber, which guarantees lowest emissions of toxic flue gas components.
Źródło:
Journal of KONES; 2015, 22, 2; 97-102
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of indicator valve channel untightens and loss of patency on the parameters values image obtained from indicator diagram
Autorzy:
Cuper, D.
Łutowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/245434.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
indicating valve
piston engine
indicating
Opis:
Indication process of big marine and industrial diesel engines are taken through indicating canals with indicating valves. Influence of these channels on parameters values obtained from engines indication is significant. Depending on chosen method of TDC determination the obtained image course error could achieved even 80% of measured value. It is assumed that this error is systematic and identical for whole engine cylinders or even for whole the same engines type. From these reasons such measurement are commonly used only for comparative tests. Engines exploitation caused technical degradation of indicators canals and valves. Unburnt fuels and oil particles deposits in channel changing its patency and also untightens in connections occurs. These are the reasons of changing in indication pressure diagram image. Process of degradation could be treated as random and measured parameters could be also burden by random error. During tests which were carried out on Sulzer type 6AL20/24 engine simulations of indicator canal malfunctions were made and their influence on obtained indication parameters were checked. Obtained parameters devalue sense of engine tuning in exploitation which based only on comparative tests of indicating pressure curves.
Źródło:
Journal of KONES; 2011, 18, 3; 61-66
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concept of sagnac effect application in measurement of angular acceleration of piston engine crankshaft
Autorzy:
Łutowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/245096.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
pressure measurement
piston engine
indicating
Opis:
In the paper results of conducted in Polish Naval Academy researches aiming to diagnostic using of measurement of engine crankshaft unsteady angular speed measurement will be presented. Similar works were many times started in different research centres. Up to now, adequate accuracy of measurement had not been achieved to make proper diagnostic decision. In commercial field, measurement of unsteady rotation speed has been used only in MAPEX –TV system (Torsional Vibration detector) dedicated to SULZER engines, which up to now without any mistakes detected only the one engine cylinder switch out of work. To the advanced diagnostic system, there are a lot off work to do. For several years in navigation, more often are used optic gyroscopes, which work on the base of Sagnac effect, assuring angular speed measurements, with 0.001 o/h resolution. Such resolution is absolutely higher than needed in piston engines diagnostic, but range of measured rotation speed is much lower than rpm of low speed marine diesel engines. In scope of conducted scientific work, it was decided to build of model of Sagnac interferometer prepared to measure rotational speed in range adequate to medium speed marine diesel engines. At rotational speed, equal 750 rpm 1 mV change in output voltage had been achieved for the difference of 0.4 o/sec of rotational speed. Time of measurement is equal the time, which need light to go through distance of 100 m fibber-optic line. In practice, this method does not introduce any significant phase shifts and does not limit the number of samples per revolution.
Źródło:
Journal of KONES; 2014, 21, 4; 319-326
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the thermal loads in the Subaru EJ25 engine
Autorzy:
Wendeker, M.
Magryta, P.
Majczak, A.
Biały, M.
Powiązania:
https://bibliotekanauki.pl/articles/242017.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
modelling
thermal model
ABAQUS
piston engine
Opis:
The research focuses on the solutions to avoid overheating the intake and exhaust valves due to engine overload. Subaru EJ25 engines are currently mounted in passenger cars such as Subaru Impreza but the author's innovative idea is to use them in small passenger airplanes. The paper describes the coupled thermo - mechanical load model of a supercharged Subaru EJ25 engine. The engine piston was tested thermally and mechanically, and the intake and exhaust valves only thermally. The calculations were done using the finite element method (FEM) in ABAQUS 6.10. Parts where divided into Hex and Tet mesh elements, depending of their geometry. The models used in the simulation were previously created using CATIA v5. Because there were only separate parts, the authors used only Part Module. The process of 3D scanning based on the method of reverse engineering was for fine mapping the surface of the examined parts, e.g. a piston. The boundary conditions and material properties are based on the literature and the information provided by the companies that sell spare parts for this engine. The simulations were done for varied heating times and mechanical load (25, 50, 100, 250, 400 seconds).
Źródło:
Journal of KONES; 2011, 18, 1; 683-688
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unsteady angular speed of diesel engine crankshaft preliminary examination
Autorzy:
Łutowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/241845.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
cylinder pressure measurement
piston engine
indicating
Opis:
The paper discusses issues related to measurement of unsteady angular speed of diesel engine crankshaft. The focus is on the selection and optimization of the measuring method to obtain high accuracy, eliminating errors resulting from the unsteady angular speed of markers on diesel engine crankshaft. A method that uses a counter markers placed on the engine flywheel had been worked out. Markers location has been read out by two slit optical sensors. Number of markers and the distance between the sensors were chosen so as to counter tooth during the transition between the sensors count the more than 10,000 pulses at rated speed of the shaft. This provided a measurement method resolution at 0.01 %. Initial studies were performed on one-cylinder diesel engine with the greatest unsteady of angular speed. Additionally analysis which treated the measured unsteady angular speed of diesel engine crankshaft as a deforming pressure mapping as a function of the calculated piston movement was performed. This deformation is caused by the assumption that a constant rotation speed is proportional to time, and measurements are made at a constant rate. In the case of synchronized measurements of PLL circuits duplicating markers on the shaft against the expectations the deformations due to the activity of the follow-up mode of such systems are increased. The influence of these deformations on the designation of an average error of cylinder indicated pressure and other parameters obtained from the analysis of the pressure and vibration envelope has been examined.
Źródło:
Journal of KONES; 2012, 19, 4; 393-399
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the marine 4 - stroke diesel engine malfunctions on the nitric oxides emission
Autorzy:
Lewińska, J.
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/247875.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
emission
malfunction
piston engine
marine engine
nitric oxides
Opis:
The article presents the results of the laboratory study on nitric oxides (NOx) emission level from marine fourstroke diesel engine. The object of the study was laboratory piston engine, operating at constant speed. Measured engine parameters were necessary to determine the NOx emission in accordance of the requirements of the Annex VI to MARPOL 73/78 Convention. The study consisted of tests during the engine operation without malfunctions and engine operation with simulated malfunctions. Malfunctions of the charge gas exchange in the form of throttling of the air intake duct and the throttling of the exhaust gas duct were taken into account in the simulations. Measurements during the engine operation with simulated malfunctions of the fuel pump on one of the cylinders were also carried out. Mentioned malfunctions were delay of the fuel injection by 5° of the crankshaft angle position and the leakage of the fuel pump of the second engine cylinder. The simulated malfunctions decrease the total weighted NOx emission in all considered the engine loads. All simulated malfunctions resulted in an increase of the NOx emissions during engine operation at low the engine loads and a decrease of the mentioned emission at maximum the engine loads operation. The calculations of the weighted specific fuel consumption present a little change in engine efficiency which are within the range of measuring error of the used method.
Źródło:
Journal of KONES; 2013, 20, 1; 171-177
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aviation piston engines : flight parameter analysis
Autorzy:
Boguszewicz, P.
Glowacki, P.
Powiązania:
https://bibliotekanauki.pl/articles/245160.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aviation piston engine
on-condition maintenance
engine flight parameter
Opis:
A program and tools enabling general aviation operators in our country the exploitation of the piston engines oncondition has been developed in the Institute of Aviation. Apart from the existing and strictly supervised engine manuals tasks, the program introduces, among other things, new maintenance mandatory activities like engine parameter monitoring during cruise and climb and a way of assignation diagnostic tolerance limits for them. That has never been performed in the aviation piston engines maintenance practice. In order to improve such analysis a flight data recorder (FDR) EDM 900 has been installed on the DA20- C1 „Katana” aircraft equipped with IO-240-B engine, which will allow elimination of the pilot's read errors and examination of the changes in the parameters during the entire flight. This will enable estimating if at a certain time of the flight a specified engine parameter is not exceeding the permissible values. Parameters from cruise have to be recorded in the similar range of the engine rpm’s. The parameters are oil pressure, oil temperature, cylinder head temperature, EGT, fuel flow, outside air temperature, rpm and altitude. Lower and upper acceptable limit values should be set, in which they can be contained throughout engine life. Engineers should also observe the trend of their changes. This article shows results of the aviation piston engine parameters analysis taken from FDR for ground runs, take-offs and cruise flight phases.
Źródło:
Journal of KONES; 2016, 23, 3; 41-48
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obróbka dyskretnie pomierzonych przebiegów momentu obrotowego i prędkości kątowej w warunkach pracy ustalonej okrętowego zespołu napędowego z silnikiem tłokowym
Working discretely measured waveforms of torque and angular velocity in the operating conditions established marine powertrain with an engine
Autorzy:
Polanowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/223225.pdf
Data publikacji:
2006
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
silnik tłokowy
napędy
diagnostyka
piston engine
drives
diagnostics
Opis:
W referacie na przykładzie obróbki pomierzonych dyskretnie prędkości kątowej i momentu obrotowego zaprezentowano cztery metody obróbki danych o przebiegach cyklicznych: interpolację i transformację Fouriera, aproksymację średniokwadratową wielomianami trygonometrycznymi, uśrednianie synchroniczne i ruchomą aproksymację. Pokazano, że dla wyłonienia sygnału użytecznego na tle zakłóceń oraz dekompozycji zakłóceń wystarczy zastosować uśrednianie synchroniczne i wielokrotną ruchomą aproksymację. Dla wyłonienia znaczących prążków widma może być zastosowana aproksymacja średniokwadratowa wielomianami trygonometrycznymi. Metoda ta dysponuje kryterium dla filtracji sygnałów oraz jest odporna na zakłócenia, ucięcie przebiegu i nierównomierność próbkowania. FFT może mieć znaczenie pomocnicze dla wstępnej analizy widma. Jej główną wadą jest to, że dla utworzenia filtru wygładzającego parametry tego filtru należałoby ustalić wcześniej, np. stosując pozostałe metody.
The paper uses processing of discretely measured angle speed and torque as an example to present four methods of data processing of cyclic distribution: interpolation, Fourier transformation, quadratic mean approximation with trigonometric polynomials, synchronic averaging and movable approximation. It shows that in order to extract a usable signal against interference and decomposition of interference it is enough to use synchronic averaging and polynomial movable approximation. To extract significant spectrum stripes the quadratic mean approximation with trigonometric polynomials can be used. The method contains the criterion for filtering signals and is resistant to interference, cutting of distribution and irregularity in sampling. FFT can have some additional significance for the initial analysis of spectrum. Its main disadvantage is that to make a perfecting filter the parameters of this filter should be established in advance, e.g. using the other methods.
Źródło:
Zeszyty Naukowe Akademii Marynarki Wojennej; 2006, R. 47 nr 2 (165), 2 (165); 89-112
0860-889X
Pojawia się w:
Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of novel composite pistons for diesel engine
Autorzy:
Jankowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/247362.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
internal combustion engine
diesel engine
piston engine
composite alloy
combustion engine performance
Opis:
The paper presents the requirements to be met by diesel engines and their components, in particular pistons for engines of military vehicles. These requirements are related to the mass of modern military vehicles, which has greatly increased. Materials for the piston should have a good strength properties and low hysteresis of thermal expansion coefficient α across the range of operating temperatures, good resistance to galling, low abrasion, low coefficient of friction and good functional properties. On the clearance of the piston in the cylinder, the coefficient of thermal expansion α and its hysteresis has a decisive influence. The paper includes information on the piston working clearances, the requirements for pistons materials, their chemical composition, standard materials for the forged pistons, for the cast pistons (silumin alloys) and for the composite pistons. The paper presents the changes in coefficient of thermal expansion for the alloy in the raw state and after heat treatment and pistons made of new composite material prior to motor testing and after these tests. The completed new pistons have a lower coefficient of thermal expansion and lower hysteresis α, which allows reducing the running piston and cylinder clearances with the resulting effects.
Źródło:
Journal of KONES; 2014, 21, 4; 211-216
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design considerations of a linear generator for a range extender application
Autorzy:
Seo, U.
Riemer, B.
Appunn, A.
Hameyer, K.
Powiązania:
https://bibliotekanauki.pl/articles/141103.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
linear generator
free piston engine
range extender electric vehicle
Opis:
The free piston linear generator is a new range extender concept for the application in a full electric vehicle. The free piston engine driven linear generators can achieve high efficiency at part and full load which is suitable for the range extender application. This paper presents requirements for designing a linear generator deduced from a basic analysis of a free piston linear generator.
Źródło:
Archives of Electrical Engineering; 2015, 64, 4; 581-592
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bench Tests for Exhaust Gas Temperature Distribution in an Aircraft Piston Engine with and without a Turbocharger
Autorzy:
Czarnigowski, Jacek Andrzej
Skiba, Krzysztof
Rękas, Daniel
Ścisłowski, Karol
Jakliński, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2123277.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
temperature distribution
piston engine
exhaust system
turbocharging
Rotax 912
Opis:
In ultralight aviation, a very important engine parameter is the power-to-weight ratio. On the one hand, there is a tendency to minimize the size and weight of engines, and on the other hand, there is a demand to achieve the highest possible power by using supercharging systems. Increasing power brings many benefits, but it also increases temperature in the exhaust system, posing a threat to delicate parts of the ultralight aircraft fuselage. Therefore, it is necessary to control temperature values in the engine exhaust system. This article presents the temperature distribution in the exhaust system of an aircraft engine by the example of a four-cylinder Rotax 912 engine with an electronic fuel injection system. The research was conducted in two stages: measurements were made first for the engine without a turbocharger with an original exhaust system and later for its modified version with an added turbocharger system. The paper presents a comparative analysis of exhaust gas temperatures measured at three points: 30, 180 and 1000 mm from the cylinder head. The tests were conducted for the same preset engine operating conditions at constant speed and manifold air pressure. It has been shown that the exhaust temperature in the exhaust manifold decreases with the distance from the cylinder head. The highest gradient, over three times higher than the gas temperature from 589.9 °C to 192.3 °C, occurred in the manifold with a turbocharger for 2603 RPM and 31 kPa of manifold air pressure. The introduction of turbocharging causes an increase in exhaust gas temperatures before the turbocharger by an average of 12%, with this increase being greater for operating points of higher inlet manifold pressure. Turbocharging also causes a significant decrease in exhaust gas temperatures behind the turbocharger and the silencer because the temperature drops there by an average of 25%.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 3; 155--166
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie obciążeń układów korbowych w różnych typach silników tłokowych
Comparison of loads of crank systems of different types of piston engines
Autorzy:
Gwiazda, A.
Szafraniec, M.
Powiązania:
https://bibliotekanauki.pl/articles/408959.pdf
Data publikacji:
2011
Wydawca:
Politechnika Śląska
Tematy:
układ korbowy
silnik tłokowy
obciążenie
crank system
piston engine
load
Opis:
Układy korbowe stanowią zasadniczy element silników tłokowych. Charakterystyka ich pracy decyduje bezpośrednio o charakterystyce pracy całego silnika. W związku z tym w niniejszym opracowaniu przedstawiono analizę obciążeń układów korbowych w różnych typach silników. Wskazano także na wady i zalety każdego z omawianych rozwiązań, które należy ocenić gdyż wpływają na zakres jego wykorzystania.
Crank systems are the essential part of piston engines. Their operating characteristics directly determine the characteristics of work of the whole engine. Therefore, this study presents an analysis of crankshaft system loads in different types of engines. It also shows the advantages and disadvantages of each of these solutions that should be assessed, because they affect the extent of its use.
Źródło:
Wybrane Problemy Inżynierskie; 2011, 2; 107-112
2083-1021
Pojawia się w:
Wybrane Problemy Inżynierskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of the engine tuning on its technical condition assessment based on limited Number of available parameters
Autorzy:
Łutowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/27315857.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
piston engine
indicated pressure
diagnostics
silnik tłokowy
ciśnienie wskazywane
diagnostyka
Opis:
Due to the limited scope of the diagnostic equipment on the ship, the technical condition of the engine is based on the measurement of pressure and temperature at the available measuring points. Usually it is the exhaust temperature at the outlet of individual cylinders, supercharging pressure, oil temperature and cooling water temperature. Sometimes the bearing temperature and turbocharger speed are also measured. Normally, if the engine is adapted to this, the maximum combustion pressure is measured periodically although distorted through the channels with the indicator valves. The paper presents examples of the exploitation of marine diesel engines, where there is a discrepancy between the actual technical state of the engine and the technical state of the engine based on the traditional diagnostic method based on a limited set of available parameters. These discrepancies resulted, inter alia, from the regular fuel injection timing and fuel dose adjustment, so that the measured parameters were adequate to the actual load of the engine. This adjustment is justified, but leads to masking engine components wear symptoms. In this situation, it can only be stated that the state of the fuel injection equipment is suitable for the current technical state of the some engine components and does not provide a sufficient basis for the extension of the repair interval.
Źródło:
New Trends in Production Engineering; 2018, 1, 1; 721-727
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ faz rozrządu i wzniosów zaworów na napełnianie cylindrów silnika tłokowego
Influence of valves timing and valves lifts on piston engine cylinder filling
Autorzy:
Boguszewicz, P.
Czyż, S.
Powiązania:
https://bibliotekanauki.pl/articles/213686.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
silnik tłokowy
napełnianie cylindra
rozrząd
piston engine
filling of cylinder
timing
Opis:
Celem pracy było przedstawienie wpływu ustawienia parametrów układu rozrządu silnika na sprawność napełniania. W pracy przedstawiono również kilka przykładowych systemów zmiennych faz rozrządu stosowanych w silnikach trakcyjnych. Za pomocąuproszczonego modelu matematycznego wymiany ładunku w cylindrze przedstawiono wpływ zmiany czasu otwarcia zaworów oraz wzniosu na napełnienie cylindra. Z przeprowadzonych obliczeń wynika, że maksymalną sprawność napełniania uzyskuje się przy najniższych prędkościach obrotowych silnika. Przy maksymalnych prędkościach obrotowych, gdy spodziewamy się największych osiągów, konieczne jest odpowiednie dobranie momentu otwarcia i zamknięcia zaworów dolotowych.
The purpose of this paper was to present the influence of the four stroke engine valve train parameters on the efficiency of cylinder filling. Examples of variable valve timing system were shown as well. The effect of valve timing and lift change versus fill of the cylinder were shown using a simplified mathematical model of charge exchange in the cylinder. The performed calculations show that maximum efficiency of cylinder filling is achieved at the lowest engine rotation speeds. At the maximum engine rotation speeds, at which we expect the largest performance, it is necessary to select the appropriate moment of opening and closing of the intake valves.
Źródło:
Prace Instytutu Lotnictwa; 2016, 3 (244); 329-345
0509-6669
2300-5408
Pojawia się w:
Prace Instytutu Lotnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania statystycznych właściwości silnika spalinowego w statycznych warunkach pracy
The study of statistical properties of the internal combustion engine in static conditions
Autorzy:
Chłopek, Z.
Piaseczny, L.
Powiązania:
https://bibliotekanauki.pl/articles/222428.pdf
Data publikacji:
2004
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
silniki spalinowe
azot
układy pomiarowe
combustion piston engine
nitrogen
measuring systems
Opis:
Zmienność statycznych warunków pracy silnika spalinowego w zakresie wyższych częstotliwości ma charakter szumów, wynikających ze zjawisk nieuwzględnianych w jawny sposób w programie badań oraz z właściwości układów pomiarów. Poznanie właściwości tych szumów obserwowanych sygnałów statycznych ma istotne znaczenie w procedurach wyznaczania reprezentatywnych wartości wielkości traktowanych jako statyczne i wolnozmienne w warunkach nieuniknionych zakłóceń. Badania przeprowadzono w statycznych warunkach pracy silnika okrętowego Sulzer typu 6AL 20/24, określonych momentem obrotowym Me = 4,33 kN*m i prędkością obrotową n = 660 min–1. Do analiz wybrano wielkości charakteryzujące emisję zanieczyszczeń zawartych w spalinach w warunkach opisanych punktem pracy silnika: moment obrotowy, prędkość obrotową oraz stężenia tlenku węgla, węglowodorów i tlenków azotu. Badania przeprowadzono w dziedzinach: czasu, wartości procesu oraz częstotliwości. Stwierdzono, że badane przebiegi szumów, generowanych przez zjawiska nieuwzględniane w jawnej postaci w programie badań statycznych silnika spalinowego oraz przez układy pomiarów, mają w przeważającym zakresie charakter nieskorelowanych szerokopasmowych szumów normalnych. Wyniki badań uzasadniają m.in. zasadność uśredniania wyników pomiarów w warunkach statycznych oraz uśredniania synchronicznego w warunkach ustalonych.
Changeability in static work conditions of an internal combustion engine for higher frequencies appears as noises resulting from phenomena which are not taken into account in an explicit way in the investigation program or from properties of measurement systems. To discover the properties of the noises in the statistic signals being observed is important for procedures used to determine representative values of magnitudes treated as static and free-changeable in the conditions of unavoidable disturbances. The investigations were carried out for static work conditions of Sulzer 6AL 20/24 engine, for torque Me = 4,33 kN*m and rotational speed n = 660 min–1. To do analyses, selected were magnitudes characterizing pollution emission contained in exhaust gases in conditions described with engine work point: torque, rotational speed, carbon dioxide concentration, hydrocarbons and nitrogen oxides. The investigations were carried out for time, values of process and frequencies. It was found out that the distribution of the noises investigated, generated by the phenomena not taken into account in the explicit way in the in the investigation program or from properties of measurement systems are mainly of uncorrelated wideband normal noises character. The results of the investigations justify averaging the measurement results in statistical conditions or synchronic averaging in fixed conditions.
Źródło:
Zeszyty Naukowe Akademii Marynarki Wojennej; 2004, R. 45 nr 1 (156), 1 (156); 71-88
0860-889X
Pojawia się w:
Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 179

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