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Wyświetlanie 1-15 z 54
Tytuł:
Analysis of vibroacoustic properties of the 250-C20R/2 RRC (Allison) engine in the support surface of the compressor
Autorzy:
Kowalski, M.
Powiązania:
https://bibliotekanauki.pl/articles/247973.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
vibroacoustic properties
engine vibration analysis
Opis:
The paper presents an analysis of the levels of vibration on the compressor in the support surface of the American RRC Allison 250-C20R engine built into the SW-4 Puszczyk helicopter. Then, it presents the association of occurring vibrations with their source of origin, and also the comparison of their values with the limit values specified in the operating manual of the helicopter. The methodology of the conducted research and analyses are explained. The essential elements preceding the research, such as determining time courses, on the basis of which the most important parts to conduct the detailed analyses of changes of the basic parameters and compliance with technical conditions, are defined. Moreover, the theoretical issues in terms of determination and description of the characteristic parameters of mechanical vibrations are briefly presented. The typical terms used in the procedures of vibration, description and measurements are explained. The importance of the interpretation of measurements is quite significantly emphasised and the components of the main engine, which were subject to measurement, are indicated. The difficulties in the identification of the vibration due to the high probability of overlapping of vibrations coming from several elements are emphasised. Next, the methodology of measurement is described, in which, among others, mounting points of vibration sensors are presented. The final part of the paper is mainly a graphical presentation of the results, on the basis of which the conclusions are developed. The conclusions show a lack of decisive symptoms indicating the danger at the level of vibrations, and present the future directions of work, which will allow for a more detailed analysis.
Źródło:
Journal of KONES; 2014, 21, 4; 281-288
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of the vibrations of a different kind of engine mounted in the same new motor vehicles
Autorzy:
Sitnik, L.
Magdziak-Tokłowicz, M.
Wróbel, R.
Powiązania:
https://bibliotekanauki.pl/articles/247090.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
laser Doppler vibrometry
engine vibration
vibration velocity
Opis:
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.
Źródło:
Journal of KONES; 2011, 18, 4; 443-448
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilising the resonance frequency of the engine vibration sensor in diagnostics of the exhaust valve leakage
Autorzy:
Komorska, I.
Powiązania:
https://bibliotekanauki.pl/articles/246940.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
valve defect
engine vibration
vibroacoustic model
Opis:
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.
Źródło:
Journal of KONES; 2010, 17, 2; 209-216
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The identification of piston-cylinder clearance using time-frequency methods
Autorzy:
Flekiewicz, M.
Fabiś, P.
Madej, H.
Powiązania:
https://bibliotekanauki.pl/articles/245755.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
fault diagnosis
engine vibration
Gabor Spectrogram
Adaptive Spectrogram
Opis:
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.
Źródło:
Journal of KONES; 2009, 16, 4; 93-103
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Behaviour of a torsional vibration viscous damper in the event of a damper fluid shortage
Autorzy:
Chmielowiec, Andrzej
Michajłyszyn, Adam
Homik, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/32921253.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
engine vibration
torsional vibration
viscous damper
oil channel
damper design
Opis:
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.
Źródło:
Polish Maritime Research; 2023, 2; 105-113
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of stiffness of engine suspension cushions in an all-terrain vehicle on its transverse displacement
Autorzy:
Gardyński, L.
Caban, J.
Droździel, P.
Powiązania:
https://bibliotekanauki.pl/articles/347796.pdf
Data publikacji:
2015
Wydawca:
Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Tematy:
machinery diagnostics
engine vibration
rubber vibration isolation
military all-terrain vehicle
Opis:
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.
Źródło:
Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2015, 2; 95-102
1731-8157
Pojawia się w:
Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opracowanie metody filtracji sygnału drgań silnika spalinowego
Compilation of SI engine vibration signal filtration method
Autorzy:
Fabiś, P.
Powiązania:
https://bibliotekanauki.pl/articles/197239.pdf
Data publikacji:
2008
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
silnik spalinowy
drgania silnika
filtracja sygnału
combustion engine
engine vibration
signal filtration
Opis:
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.
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.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2008, 64; 105-112
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recovery of impact signatures in diesel engine using wavelet packet transform (WPT)
Wykrywanie wymuszeń impulsowych w silniku ZS za pomocą pakietów falkowych (WPT)
Autorzy:
Flekiewicz, M.
Madej, H.
Powiązania:
https://bibliotekanauki.pl/articles/329184.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
diagnostyka uszkodzeń
silnik spalinowy
drgania
WPT
fault diagnosis
engine vibration
Opis:
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.
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).
Źródło:
Diagnostyka; 2007, 4(44); 25-30
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental analysis of noise and vibration of a diesel engine
Autorzy:
Kilikevičienė, K.
Fursenko, A.
Kilikevičius, A.
Vainorius, D.
Matijošius, J.
Rimkus, A.
Bereczky, A.
Powiązania:
https://bibliotekanauki.pl/articles/245124.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
biodiesel
compression ignition engine
engine vibration
sound pressure level
silnik wysokoprężny
wibracje silnika
poziom ciśnienia akustycznego
Opis:
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).
Źródło:
Journal of KONES; 2018, 25, 1; 225-232
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of performances of a dual-fuel turbocharged compression ignition engine
Autorzy:
Różycki, A.
Powiązania:
https://bibliotekanauki.pl/articles/247435.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
dual fuel compression ignition engine
knock
engine head vibration amplitude
compressed natural gas (CNG)
common rail
Opis:
The paper describes research work on a full-scale dual-fuel 4-cylinder turbocharged compression ignition engine. Compressed natural gas (CNG) was applied as the main fuel. Selfignition of the air-fuel mixture was initiated from a diesel oil dose injected by a common rail system. The research was aimed to establish maximum CNG share in the mixture delivered into the cylinder. An excessive CNG share may result in "hard" engine operation. It may also lead to the occurrence of vibrations of piston-crank construction parts resulting in failure of this mechanism. These vibrations may originate from knocking combustion (selfignition of the air-fuel mixture in the zone of non-combusted mixture) or vibration excitation as a result of rapid pressure rise after selfignition. Boundary values of the CNG energy share were determined by analysing parameters related to the rate of pressure rise and rate of heat release as well as the engine head vibration amplitude represented by the voltage signal generated by the knock sensor. Boundary values of the above mentioned parameters were determined on the basis of measurements done on the engine fuelled in a standard mode. These parameters were registered at operating points corresponding to the maximum power and load. Then, there were done measurements of basic engine operating parameters at dual fuelling in chosen points of the load characteristic for the engine speed at which the engine fuelled in a standard mode had maximum torque. Load characteristics were done for three various diesel oil doses (constant over the whole range of engine load). Load changes were realized by changes ofCNG energy share in the fuel charge. Analysis of combustion process parameters and engine head vibrations showed that CNG energy share may reach 60%. Maximum torque is possible to obtain at 45% CNG energy share. 15% decrease of maximum torque was obtained.
Źródło:
Journal of KONES; 2010, 17, 3; 393-399
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of vibration signals in the diagnosis of combustion engines - exploitation practices
Autorzy:
Stanik, Z.
Warczek, J.
Powiązania:
https://bibliotekanauki.pl/articles/245993.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
vibration diagnostics
combustion engine
Opis:
Changes in operating properties of the internal combustion engine, for various reasons, may manifest themselves with similar symptoms. An example is the drop in engine power, which may be caused by malfunctioning of the system such as power supply, or excessive wear geometric kinematic pairs as the piston-crankshaft. Identification of the causes of malfunction is the basis for carrying out corrective action. In practice, the workshop frequent disability are different manifestations of the drive units having identical symptoms. An alternative to iterative repair methods is the introduction of diagnostic tools that will help identify causes of failure, without having to remove the individual motor units. These provisions comply with the method of vibration analysis. The vibration signals provide information about the technical condition of the object. The paper presents examples of applying the methods of vibration in the identification of changes in the technical condition of the engine, which confirm their usefulness in identifying sources of failure. During the process of investigations, time courses of vibration accelerations were recorded with piezoelectric transducer mounted at half height of the first cylinder, perpendicular to its axis. The worked out method is based on vibration signals recorded at engine operation. The dominant amplitude components of time courses are strongly connected with air- fuel mixture ignition as well as with kinetic pairs of the engine.
Źródło:
Journal of KONES; 2011, 18, 3; 405-412
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibro-acoustic methods in marine diesel engines diagnostics
Autorzy:
Lus, T.
Powiązania:
https://bibliotekanauki.pl/articles/245521.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine diesel engine
turbocharger
diagnostics
vibration
Opis:
Vibro-acoustic diagnostic methods which are used on marine high-speed diesel engines with turbochargers are presented in this paper. Vibration and acoustic signals generated by turbochargers need different signal processing methods to be effective and faultless in turbochargers diagnostics. Diagnostic methods which based on vibration and acoustic signals analysis are sensitive on engine load and speed changes. Methods presented in this paper based on vibration and acoustic signals processing in time and frequency domain. Using this methods checking technical condition of the turbochargers and its rotors and bearings without stopping the engine and dismantling it is possible. Examples of radial-flow rotor turbine overgrown by carbon soot and axial-flow rotor turbine without turbine blades, sound intensity level of turbocharger and acoustic spectrum of turbocharger in octave mode acoustic spectrum of turbocharger in octave mode for two different technical conditions, acoustic and vibration signal spectrum of the turbocharger, vibration acceleration amplitude of first harmonic for three turbochargers, values of harmonic vibrations of accelerations equivalent of turbine blades number, amplitude of vibrations accelerations in frequency domain for turbocharger in good and bad technical conditions are presented in the paper.
Źródło:
Journal of KONES; 2011, 18, 3; 203-210
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trimassnaja vibracionnaja mel'nica s chetyr'mja vibrovozbuditeljami
Three mass of oscillation mill with four causative vibroagents
Autorzy:
Solonaya, E.
Liubin, V.
Powiązania:
https://bibliotekanauki.pl/articles/76991.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
synchronization
vibro-mill
oscillation
asynchronous engine
vibration
Opis:
The task of synchronization of treemassvibromill is in-process considered with three unbalance vibration exciters which are started going from independent asynchronous engines and have identical angulators. Two causative vibroagents from presented are set on additional bodies [1].
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 4
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automotive vehicle engine mount based on an MR squeeze-mode damper: modeling and simulation
Autorzy:
Sapiński, B.
Snamina, J.
Powiązania:
https://bibliotekanauki.pl/articles/281564.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
engine mount
vibration reduction
MR damper
control
algorithm
Opis:
The study investigates the performance of a semi-active vehicle engine mount incorporating an MR damper working in the squeeze mode (MRSQD), summarising its design, operating principles and key characteristics. The mathematical model of the mount is formulated based on the newly developed MRSQD. Two control algorithms are proposed for MRSQD control. The first algorithm (ALG1) uses the inverse model of the engine-frame system, the other is the sliding mode algorithm (ALG2). The effectiveness of the engine mount system is demonstrated in computer simulation.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 377-388
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of components of vibration signal from the Hatz 1B40 engine
Autorzy:
Boruta, G.
Imiołek, M.
Powiązania:
https://bibliotekanauki.pl/articles/245448.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
mechanics
compression-ignition (diesel) internal combustion engine
vibration and sound
engine control
Opis:
An experiment is described consisting in recording of vibration signals on the body of a HATZ 1B40 single-cylinder compression-ignition engine, applied among other things as a driving source for FOGO power generators. Characteristic time courses fragments of the recorded vibration signals were linked to occurrence of specific phenomena in the working engine and with operation of specific engine mechanisms generating these signals. Potential was found for utilization of the vibration signal recorded on the body of a HATZ 1B40 compression-ignition engine for optimization of simultaneous feeding of the engine with diesel oil and natural gas. There are potential possibility of application of a simple knock sensor from a spark-ignition engine as a component of a feeding control system of a compression-ignition engine with diesel oil and natural gas. Theoretical time course of vibration signal of the HATZ 1B40 engine, example oscilloscope trace of time courses of signals reflecting, location of mounting of the vibration acceleration sensor on the engine, allocation of the theoretical and empirical time course of the vibration signal of the HATZ 1B40 engine, example vibration signal time courses recorded at the head of an engine fed with various mixtures of air and natural gas and diesel oil with oval-marked fragments corresponding to diesel oil injection are presented in the paper.
Źródło:
Journal of KONES; 2011, 18, 3; 45-51
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
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