Wyniki wyszukiwania - BazTech

1

Behaviour of a torsional vibration viscous damper in the event of a damper fluid shortage

Chmielowiec Andrzej, Michajłyszyn Adam, Homik Wojciech

Polish Maritime Research

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2023

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nr 2

105--113

EN

This article presents the analysis of a damping fluid deficiency in a torsional vibration viscous damper. The problem is analysed both qualitatively and quantitatively. Experimental results are presented, showing what happens to the damper in a situation where the design of the housing is inadequate and the inertia forces prevent the formation of an oil film. In addition, the article deals with the problem of the proper design of the oil channel and the dimensions required to enable the damper to operate reliably. The results of the article may be useful to the constructors of torsional vibration viscous dampers for marine engines.

2

Experimental analysis of noise and vibration of a diesel engine

Kilikevičienė K., Fursenko A., Kilikevičius A., Vainorius D., Matijošius J., Rimkus A., Bereczky A.

Journal of KONES

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2018

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Vol. 25, No. 1

225-232

EN

Noise and vibration of ignition compression engine is one of the most complicated fields to cope with since every mechanism that compose of the engine affect them separately. In this study, effect of diesel on engine noise and vibration has been studied on an unmodified compression ignition engine. Noise and vibration characteristic of a direct ignition engine, which was fuelled with diesel, were investigated. With the usage of equations obtained from regression analysis, estimation of engine characteristic fuelled with various biodiesels researches were carried out. Tests were conducted at fixed injection timing of diesel fuel. The first system is for diesel fuel injection; the second one is PFI (port-fuelled injection) and is used for injecting alcohol into the engine intake manifold. The engine applied to this study was a naturally aspirated, 3in-line, IVECO AIFO 8031 i06.05 diesel engine with direct injection. Experiments were conducted in a sound insulated room. For each experiment, vibration data gathered from the engine block with 3.2 kHz (for vibration) for 2 s and with 20 kHz sampling frequency for 0.320 s. All measurements were performed under conditions: angle 10; 4 different loads (4, 8, 12 and 20 kW).

3

The impact of stiffness of engine suspension cushions in an all-terrain vehicle on its transverse displacement

Gardyński L., Caban J., Droździel P.

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki

|

2015

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Nr 2

95--102

EN

The article presents the results of experimental research carried out for different types of diesel engine suspension cushions (plate connectors) in two all-terrain cars. The study was performed using three types of engines in three combustion engines operating conditions. The analyzed parameters were transverse displacement engine vibrations caused during various engine operating conditions between the engine and body of the vehicle. The results of the tests of different types of plate connectors for engine suspension can be useful when designing propulsion systems for military vehicles and military utility all-terrain cars, or as shown by the author [4,5] to modernize the existing military vehicles. Vibrations transmitted to the body chassis can also have a significant impact on the operation of the vehicle mounted equipment and weaponry.

4

Exposure to vibrations generated by the motor vehicle

Burdzik R., Czech P., Konieczny Ł., Folęga P.

Journal of Polish CIMAC

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2013

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Vol. 8, no 1

23--30

EN

The article provides a discussion on the studies and analysis of exposure to vibrations generated by the motor vehicle. For the driving safety and comfort it is very important what kind and values of vibration are to car boy. As the vibration source the motor-engine was chosen. The experiments were conducted on the car vehicle which was placed on the special test racks. It allows eliminate the road roughens impact on the suspension and in result to car body. The changes of the vibration signals from the motor-engine, floor panel and seat were observed and measured in 3 axes. These vibrations are producing a level of discomfort for driver.

5

Determination of the influence of the stiffness of the diesel engine suspension cushions in the terrain car

Caban J., Gardyński L.

Journal of Polish CIMAC

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2012

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Vol. 7, no 2

7-16

EN

The article presents the results of experimental investigations carried out for different types of diesel engine suspension cushions in the terrain car. The study was performed using two types of suspension cushions in a variety of combustion engine operating conditions. The effect of engine displacement as a result of vibrations between the engine and vehicle body was tested. The endurance testing of the suspension cushions was done using the endurance testing machine Zwick Z-100. Next, we analyzed the results obtained in experimental studies of the differences between the vibration of the suspension cushions. The results of the tests of different types of plate connectors for the engine suspension can be useful when designing propulsion systems for military vehicles and military utility terrain cars, or as shown by the author [1, 4] to modernize of the existing military vehicles stock.

6

Analysis of directional distribution of vibrations generated by the combustion engine

Burdzik R., Czech P., Konieczny Ł., Wojnar G.

Journal of Polish CIMAC

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2012

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Vol. 7, no 1

27-32

EN

The article provides a discussion on the studies and analysis of directional distribution of vibrations generated by the combustion engine. The engine is one of the sources of the vibrations in vehicles. The analysis of the vibration propagation from source should take into account the directions of the propagation and the dynamics of the vibration. The experiment was conducted on the vehicles combustion engine and the orthogonal axes vibrations were measured. Analysis of the results allows comparing the values and frequencies of the vibration propagation.

7

Diagnozowanie uszkodzenia zaworu wylotowego silnika spalinowego na podstawie analizy falkowej drgań

Komorska I., Stanik Z.

Silniki Spalinowe

|

2011

|

R. 50, nr 3

PL

W referacie zaproponowano metodę diagnozowania nieszczelności zawór wylotowy - cylinder w oparciu o pomiar sygnału drgań głowicy silnika. Przedstawiono wyniki analizy pomiarów sygnału drgań silnika w warunkach uszkodzonego zaworu wylotowego silnika oraz niewłaściwego luzu zaworowego. W tym celu przeprowadzono czynny eksperyment diagnostyczny na silniku samochodu Fiat Punto 1.2. W czasie testów drogowych zarejestrowano sygnał przyspieszenia drgań, a także pomocnicze sygnały służące synchronizacji oraz identyfikacji faz rozrządu. Wykorzystano przy tym naturalne wzmocnienie drgań w zakresie częstotliwości rezonansowej czujnika piezoelektrycznego. Zadowalające rezultaty uzyskano w oparciu o analizę falkową sygnału przyspieszenia drgań silnika. Wyznaczono miary sygnału w jednoznaczny sposób określający stan zaworu. Metoda jest nieinwazyjna, a badania przeprowadzane są w warunkach eksploatacyjnych. Z pewnymi modyfikacjami metoda może być zastosowana do diagnozowania zaworów on-line.

EN

The paper proposes the method of diagnosing of cylinder exhaust valve leakage based on the measurement of the cylinder head vibration signal. The results of vibration signal analysis of the engine with the damaged exhaust valve and with changed exhaust valve clearance are presented. In this purpose the diagnostic experiment was carried out with car engine Fiat Punto 1.4. During road test the acceleration vibration signal was recorded with additional signals for synchronization and engine timing. The natural amplification of vibration at the range of resonance frequency of the piezoelectric sensor was used. Satisfactory results were obtained based on wavelet analysis of engine vibration signal. The measures of signal were determined that allow determination of the valve condition. This is the non-invasive method and the investigations are conducted during car maintenance. With some modification the method can be used for on-line diagnosis of the exhaust valves.

8

Comparative analysis of the vibrations of a different kind of engine mounted in the same new motor vehicles

Sitnik L., Magdziak-Tokłowicz M., Wróbel R.

Journal of KONES

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2011

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Vol. 18, No. 4

443-448

EN

The paper presents the results of tests carried out on two spark-ignition engines: 1.4BZ 90CV CD and 1.4BZ 120CV CD installed in new Fiat Bravo (model 198, version 54A) motor cars. The latter engine model (120CV) was equipped with a supercharging system. The research consisted in comparing engine vibrations measured in specific and representative points. In order to determine the vertical component vibrations, the measurements were performed via a mirror. A PSV-400 laser Doppler vibrometer made by Polytec was used to measure vibration velocities. The vibrometric system directly measures two quantities: displacement and velocity. In the investigated case, vibration velocity is the variable which supplies better diagnostic information. Vibrations were measured for the car standing on its wheels and for the car jacked up to reduce the influence of the car vibration damping systems on the measurement results. The latter are presented in the form of comparative diagrams. Moreover, the fast Fourier transform was used to determine the frequency distribution. Prior to that signal was subjected to conditioning operations using parametric windowing and filtering. Interesting conclusions emerge from the obtained results and on their basis the effect of the drive unit on the behaviour of the car body can be assessed for different engine types and rotational speeds. It is shown that the way in which the engine is mounted affects the vibrations of the car.

9

Comparative analysis of the vibrations of a spark-ignition engine with and without supercharger mounted in new motor vehicles

Kaźmierczak A., Reksa M., Moczko P., Wróbel R.

Journal of Polish CIMAC

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2010

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Vol. 5, no 3

49-54

EN

The paper presents the results of tests carried out on two spark-ignition engines: 1.4BZ 90CV CD and 1.4BZ 120CV CD installed in new Fiat Bravo (model 198, version 54A) motor cars. The latter engine model (120CV) was equipped with a supercharging system. The investigations consisted in comparing engine vibrations measured in spe-cific and representative points. In order to determine the vertical component vibrations, the measurements were per-formed via a mirror. A PSV-400 laser Doppler vibrometer made by Polytec was used to measure vibration velocities. The vibrometric system directly measures two quantities: displacement and velocity. In the investigated case, vibration velocity is the variable which supplies better diagnostic information. Vibrations were measured for the car standing on its wheels and for the car jacked up to reduce the influence of the car vibration damping systems on the measure-ment results. The latter are presented in the form of comparative diagrams. Moreover, the fast Fourier transform was used to determine the frequency distribution. Prior to that the signal was subjected to conditioning operations using parametric windowing and filtering. Interesting conclusions emerge from the obtained results and on their basis the effect of the drive unit on the behaviour of the car body can be assessed for different engine types and rotational speeds. It is shown that the way in which the engine is mounted affects the vibrations of the car.

10

Utilising the resonance frequency of the engine vibration sensor in diagnostics of the exhaust valve leakage

Komorska I.

Journal of KONES

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2010

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Vol. 17, No. 2

209-216

EN

A vibroacoustic signal of an internal combustion engine contains several diagnostic information, which are -for the most part - not utilised since they require complex processing methods in order to separate useful data and to eliminate disturbances. The way of analysis ofsuch complex signal depends on the diagnostic aim. It is a rich source of information not only concerning the combustion process, but also various mechanical defects occurring in the driving system (valves, clutch, gearbox). Wear of elements as well as small mechanical defects cause the adaptation of the control system to new parameters. Thus, in many cases these adaptive systems can be masking mechanical defects. Burning out of exhaust valves or an improper valve clearance are examples of such defects. The method of diagnostics of leakages in a system: exhaust valve - cylinder, on the basis of measuring the vibration signal of the engine head is proposed in the paper. The results of the analysis of the engine vibration signal under conditions of a defected exhaust valve and an increased valve clearance are presented. The active diagnostic experiment was performed on the engine of Fiat Punto 1.2. During road tests the vibrations acceleration signal was recorded as well as certain auxiliary signals used for a synchronisation and identification of engine timing. The natural acceleration of vibrations in the resonance frequency range of the piezoelectric sensor was utilized. The vibration signal was pre-processed i.e. filtered, synchronously averaged and windowed. Satisfying diagnostic results of the valve defect or the improper valve clearance were obtained on the basis of the analysis of the engine vibration acceleration signal envelope. The signal measures explicitly indicating the valve condition were determined. The method, after certain modifications, can be applied for the on-line valve diagnostics.

11

On board recognition of different fuels in SI engines with the use of dimensional and non-dimensional vibration signal parameters

Fabiś P., Flekiewicz B., Flekiewicz M.

Silniki Spalinowe

|

2009

|

R. 48, nr 1

69-75

EN

Gaseous fuels such as natural gas and propane butane mixtures are currently the most popular fuels for dual fuel internal combustion engines. Gaseous fuels are more resistant to knocking than conventional liquid fuels they mix better with air. There have been many published works on the use of gaseous fuels but the problem of the combustion noise, as a very important source of acoustic discomfort is not getting enough attention. Combustion noise occurs in a direct and indirect form. It is transmitted throughout the engine block as a vibration at a different spectrum of frequencies. In this study an attempt has been made to correlate the combustion noise with the operating parameters of an engine fueled with LPG, CNG and CNG-hydrogen mixtures as compared to petrol fueled engine. Signals of multiple resonance in the combustion chamber and corresponding vibration signals of the cylinder block of engine have been considered for one combustion cycle. A four cylinder, 1.6 dm3 spark-ignition engine converted to run on LPG, CNG and CNG-hydrogen mixtures has been tested in the project. A well known diagnostic parameter was used for comparison of the engine noise for its operation on gasoline and alternative fuels. A new non-dimensional indicator has also been proposed for the engine vibration estimation purposes the Increase Wavelet Ratio precisely described in the paper.

PL

Paliwa gazowe, takie jak mieszanki propanu butanu czy gaz ziemny są obecnie najpopularniejszymi paliwami zasilającymi silniki spalinowe. Paliwa gazowe znane są z większej odporności na spalanie detonacyjne niż paliwa płynne oraz łatwiejszego wymieszania z powietrzem. Wiele prac poświecono zasilaniu silników paliwami gazowymi, lecz problemu hałasu w trakcie spalania, jako bardzo ważnego źródła dyskomfortu, do tej pory nikt nie rozpatrywał. Hałas procesu spalania można podzielić na wewnętrzny i zewnętrzny. Wewnętrzny hałas jest transmitowany przez ścianki bloku silnika przy różnej częstotliwości. W artykule przedstawiono wyniki analiz sygnału drganiowego ścianki bloku silnika przy zasilaniu różnymi paliwami. Silnik o ZI o pojemności 1,6 dm3 przystosowano do zasilania paliwem LPG, CNG oraz mieszankami CNG i wodoru. Przeprowadzono badania wpływu obciążenia i prędkości obrotowej na poziom drgań bloku silnika. Do oceny wyników badań użyto znanego wskaźnika bezwymiarowego. W artykule zaproponowano także nowy wskaźnik bezwymiarowy do oceny drgań bloku silnika. Jest to przyrost współczynnika falkowego.

12

Estimation of IC engine fault using wavelet transform

Fabiś P., Flekiewicz B., Flekiewicz M., Sroka R.

Silniki Spalinowe

|

2009

|

R. 48, SC2

21--26

EN

A fault diagnosis technique for internal combustion engines using time-frequency representations of vibration signal is presented in this paper. Engine block vibration results as a sum of many excitations, mainly connected with engine speed and their intensity increases with the appearance of a fault or in case of higher engine elements wearing. An application of acceleration signals for the purposes of selected faults detection like piston skirt clearance increase by means of excessive wear, inlet system leaks as well as misfire has been described in this paper. Engine management system adaptive algorithms can mask some faults especially in their early progress. Reciprocating machines are difficult to diagnose using traditional frequency domain techniques because of generated transient vibrations. The Wavelet Transform has been chosen in the case of described project.

PL

W artykule przedstawiono wyniki badań silników ZI metodami wibroakustycznymi. Celem badań było określenie przydatności wybranych metod przetwarzania sygnałów wibroakustycznych do wykrywania błędów, takich jak: luz w układzie tłok-cylinder spowodowanym zużyciem eksploatacyjnym, nieszczelność układu dolotowego oraz wypadanie zapłonów. Badania przeprowadzono na hamowni podwoziowej przy stałej prędkości obrotowej i obciążeniu silnika. Z dotychczasowych badań wynika, że adaptacyjne systemy sterowania silników mogą powodować maskowanie niektórych uszkodzeń, zwłaszcza we wczesnych fazach rozwoju. Dlatego w diagnostyce silników spalinowych poszukuje się nowych metod przetwarzania sygnałów wrażliwych na rozwój uszkodzeń. Z przeprowadzonych badań wynika, analiza falkowa jest skutecznym narzędziem umożliwiającym ocenę stanu technicznego i pracy silnika.

13

The identification of piston-cylinder clearance using time-frequency methods

Flekiewicz M., Fabiś P., Madej H.

Journal of KONES

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2009

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Vol. 16, No. 4

93-103

EN

A fault recognition technique for the internal combustion engines using time-frequency representations of vibration signal has been presented in this paper. Engine block vibration results as a sum of many excitations mainly connected with engine speed and their intensity increases with the appearance of a fault or in case ofhigher engine elements wearing. In this paper an application of acceleration signals for the estimation of the influence of piston skirt clearance on diesel engine block vibrations has been described. Engine body accelerations registered for three simulated cases representing piston skirt clearance variations were an object of preliminary analysis. The presented procedures were applied to vibration and pressure signals acquired for a 0.5 dm3 Ruggerini, air cooled diesel engine. reciprocating machines are difficult to diagnose using traditional frequency domain techniques due to the fact they generale transient vibrations. In the experiments that were conducted Gabor Analysis and Adaptive Spectrogram has been chosen The Gabor spectrogram is a powerful tool for on-line monitoring and diagnosis of combustion process. There are important features of the vibration signal that are sensitive to the change of IC engine condition. For that reason the DWT transform was applied. Based on the results, authors propose detection and piston skirt clearance monitoring algorithm.

14

Opracowanie metody filtracji sygnału drgań silnika spalinowego

Fabiś P.

Zeszyty Naukowe. Transport / Politechnika Śląska

|

2008

|

z. 64

105-112

PL

W artykule przedstawiono wyniki filtracji sygnału drganiowego zarejestrowanego dla silnika spalinowego zsynchronizowanego z prędkością obrotową wału korbowego. Filtr ten umożliwi identyfikację zjawisk wibroakustycznych występujących w cyklu pracy silnika spalinowego. Przydatność filtra została zweryfikowana w trakcie badań stanowiskowych.

EN

The paper present results of SI engine vibration signal filtration method synchronized with RPM. Filter allow to identification of vibroacoustics phenomenas occurs during engine cycle working. Fitness for filter purpose was verified during bench research.

15

Ocena przebiegu zmienności siły gazowej i stycznej w funkcji kąta obrotu wału korbowego

Fabiś P.

Zeszyty Naukowe. Transport / Politechnika Śląska

|

2006

|

z. 63

109-117

PL

W artykule przedstawiono dekompozycję sygnału drgań kadłuba silnika spalinowego zasilanego paliwem benzynowym. Wyznaczono przebieg dwóch sił wymuszających drgania korpusu silnika, siły gazowej i siły normalnej porównując je z przebiegami rzeczywistymi.

EN

The paper presented decomposition of the gasoline IC engine vibration analysis. Appointed two forces which was an excitation of the block surface's, normal and gas force compared them with real result.

16

Recovery of impact signatures in diesel engine using wavelet packet transform (WPT)

Flekiewicz M., Madej H.

Diagnostyka

|

2007

|

nr 4(44)

25-30

EN

A fault diagnosis technique for internal combustion engines using time-scale representations of vibration signal is presented in this paper. Engine block vibration results as a sum of many excitations mainly connected with engine speed and their intensity increases with the appearance of a fault or in case of higher engine elements wearing. In this paper an application of acceleration signals for the estimation of the influence of piston skirt clearance on diesel engine block vibrations has been described. Engine body accelerations registered for three simulated cases representing piston skirt clearance variations were an object of preliminary analysis. The presented procedures were applied to vibration and pressure signals acquired for a 0.5 dm3 Ruggerini, air cooled diesel engine. Reciprocating machines are difficult to diagnose using traditional frequency domain techniques because of generate transient vibration. In conducted experiments WPT has been chosen as the decomposition tool for feature extraction as a tool providing a flexible time-frequency resolution and a rich library of redundant wavelet bases.

PL

W artykule przedstawiono wyniki badań diagnostycznych silnika ZS za pomocą analizy czasowo-częstotliwościowej. Drgania bloku i głowicy badanego silnika są spowodowane wieloma wymuszeniami związanymi z jego prędkością obrotową a ich intensywność wzrasta wraz z pojawianiem się uszkodzeń mechanicznych, zużycia eksploatacyjnego oraz występowania anomalii w procesie spalania. Sygnały przyspieszeń drgań wykorzystano do określenia wpływu stanu symulowanego luzu w złożeniu tłok cylinder. W ramach badań silnika ZS, chłodzonego powietrzem o pojemności 0,5 dm3 firmy Ruggerini zasymulowano trzy wartości luzu. Ze względu na fakt, że silniki spalinowe są złożonymi obiektami diagnozowania wykorzystanie tradycyjnych metod analizy częstotliwościowej nie zapewnia precyzyjnej identyfikacji charakterystycznych wymuszeń. W prowadzonych badaniach przeprowadzono dekompozycję sygnału drganiowego za pomocą pakietów falkowych (WPT).