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    Wyświetlanie 1-12 z 12
    Tytuł:
    The influence of steam extraction parameters on unsteady rotor forces
    Autorzy:
    Rządkowski, R.
    Gnesin, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933176.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska
    Tematy:
    steam extraction
    blade
    unsteady forces
    Opis:
    Aerodynamic unsteady forces of rotor blades in a turbine stage with steam extraction were calculated and blade failure was reported. A numerical calculation of the 3D transonic flow of an ideal gas through turbomachinery blade rows moving one in relation to another is presented. An ideal gas flow through mutually moving stator and rotor blades with periodicity on the whole annulus is described with unsteady Euler conservation equations, integrated using the explicit monotonous finite-volume difference scheme of Godunov-Kolgan and a moving hybrid H-H grid. In order to find the pressure distribution of steam parameters behind the rotor blades, calculations were performed for a steady flow through the stage and the steam extraction channels using the SPARC program and the unsteady forces of the rotor blade were calculated for four steam extraction conditions. For the maximal steam extraction the 10th harmonic of the axial force and moment was found to be close to the first natural frequency of the bladed disc with one nodal diameter. Thus, steam extraction can be the cause of the blade's failure.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 3; 253-261
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Self-excited vibration of a palisade in 2D subsonic, transonic and supersonic flow
    Autorzy:
    Rządkowski, R.
    Kovalyov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1941712.pdf
    Data publikacji:
    2000
    Wydawca:
    Politechnika Gdańska
    Tematy:
    blades
    flutter
    vibrations
    Opis:
    In recent years coupled fluid-structure problems have appeared. The computational method used to solve this problem was based on a time-marching algorithm, so it was natural to consider a time domain flutter analysis method. The time domain method of flutter analysis is based on the simultaneous integration in time of the equation of motion for the structure and the fluid. The flow model is capable of representing 2D flows over a wide Mach number range from low subsonic to supersonic, including transonic flows. The aerodynamic model fully accounts for blade thickness and camber and the angle-of-attack effects. The unsteady Euler equations are integrated by using the explicit monotonous second-order accurate Godunov scheme. The blade is modelled on the basis of extended beam theory including a bending-bending-torsional vibration and also by the simple two-degree of freedom model. The equation of motion is obtained by using the extended Hamilton's principle and the Ritz method. The direct integration method is used to find a solution of the coupled fluid-structure problem. In this work the comparison of numerical and experimental results is presented for the first and fourth standard configurations.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 1; 49-80
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural frequencies and modes shapes of two rigid bladed discs on the shaft
    Autorzy:
    Rządkowski, R.
    Sokołowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955709.pdf
    Data publikacji:
    2004
    Wydawca:
    Politechnika Gdańska
    Tematy:
    natural frequencies
    bladed disc-shaft
    Opis:
    The dynamic behavior of a rotor consisting of two bladed discs on a solid shaft is considered. The effect of shaft flexibility on the dynamic characteristics of the bladed discs and the coupling effects between the shaft and bladed disc modes are investigated. Results presented for various cases with differing blade flexibility show clearly the coupling effects in a bladed disc-shaft system. Interference diagrams are developed, from which the dynamic behavior of a system can be predicted for differing flexibility relationships between the solid shafts and the bladed discs. In this study, the global rotating mode shapes of flexible bladed disc-shaft assemblies have been calculated. Rotational effects such as centrifugal stiffening have been accounted for, and all the possible couplings between the flexible parts have been allowed. Gyroscopic effects have been included in the shaft with two discs. Calculated natural frequencies obtained from the blade, shaft, bladed disc and shaft with two discs have been checked to determine resonance conditions and coupling effects. The calculations have shown the influence of the shaft on the natural frequencies of the bladed discs up to one nodal diameter frequencies. The torsional frequency of the shaft with two discs is coupled with the zero nodal diameter modes of the single bladed discs. The bending modes of the shaft are coupled with one nodal diameter modes of the bladed discs. It is shown that including the shaft in the bladed discs model is important from a designer's point of view and can change the spectrum of frequencies considerably.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 1; 51-69
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D inviscid flutter of rotor blades and stator/rotor stage
    Autorzy:
    Rządkowski, R.
    Gnesin, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1967639.pdf
    Data publikacji:
    2001
    Wydawca:
    Politechnika Gdańska
    Tematy:
    3D inviscid flutter
    flutter
    blades
    stator/rotor stage
    rotor blades
    unsteady forces
    3D finite element model
    Opis:
    The approach is based on solution of the coupled aerodynamic-structure problem for 3D flow through the turbine stage in which fluid and dynamic equations are integrated simultaneously in time. An ideal gas flow through the mutually moving stator and rotor blades with periodicity on the whole annulus is described by unsteady Euler conservation equations, which are integrated using the explicit monotonous finite-volume difference scheme of Godunov-Kolgan and moving hybrid H-H grid. The structure analysis uses the modal approach and 3D finite element model of a blade. A calculation was performed for the last stage of the steam turbine with rotor blades of 0.765 m.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 4; 567-577
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frequencies and modes of rotating flexible shrouded bladed discs-shaft assemblies
    Autorzy:
    Sokołowski, J.
    Rządkowski, R.
    Kwapisz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954654.pdf
    Data publikacji:
    2003
    Wydawca:
    Politechnika Gdańska
    Tematy:
    blades
    discs
    shaft
    free vibration
    Opis:
    It is now increasingly necessary to predict accurately, at the design stage and without excessive computing costs, the dynamic behaviour of rotating parts of turbomachines, so that resonant conditions at operating speeds are avoided. In this study, global rotating mode shapes of flexible shrouded bladed disc-shaft assemblies are calculated. The rotating modes have been calculated by using a finite element cyclic symmetry approach. Rotational effects, such as centrifugal stiffening have been accounted for, and all the possible couplings between the flexible parts have been allowed. Gyroscopic effects have been neglected. The numerical results have been compared with the experimental. The calculations show the influence of shaft flexibility on the natural frequencies of shrouded bladed discs up to four nodal diameters for the two first frequencies series.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 2; 215-231
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural frequencies of tuned and mistuned bladed discs on a shaft
    Autorzy:
    Rządkowski, R.
    Drewczyński, M.
    Kubitz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955332.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska
    Tematy:
    bladed disc
    blade
    mistuning
    Opis:
    The dynamic behaviour of a rotor consisting of two tuned and mistuned bladed discs on a solid shaft is considered. The effect of the shaft's flexibility on the dynamic characteristics of the bladed discs and the coupling effects between the shaft and bladed disc modes are investigated. Results show clearly the coupling effects in a bladed disc-shaft system. Interference diagrams are developed, from which the dynamic behaviour of a bladed disc can be predicted for varying flexibility relationships between solid shafts and bladed discs. The global rotating mode shapes of flexible tuned and mistuned bladed disc-shaft assemblies are calculated. Rotational effects, such as centrifugal stiffening, are accounted for and all the possible couplings between the flexible parts are allowed. Calculated natural frequencies obtained from the blade, the bladed disc and the shaft with two discs are checked to discover resonance conditions and coupling effects. It is shown that blade mistuning strongly affects the interaction between flexible bladed discs and a flexible shaft. This interaction affects the flexible bladed disc modes and is not restricted to the modes with zero, one and two nodal diameters. The torsional frequency of the shaft with two bladed discs is coupled with the zero nodal diameter modes of the single bladed discs. It is shown that including the shaft in the bladed discs model is important from the designer's point of view and may alter the spectrum of frequencies considerably.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 3; 275-289
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelowanie strukturalnej warstwy nośnej łożyska foliowego
    Numerical modelling of the structural layer of foil bearing
    Autorzy:
    Kiciński, J.
    Żywica, G.
    Rządkowski, R.
    Drewczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/386867.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    modelowanie
    łożysko foliowe
    model numeryczny
    modelling
    foil bearing
    numerical models
    Opis:
    Łożyska foliowe dzięki swoim wielu zaletom znajdują w ostatnim czasie coraz więcej zastosowań. Dzisiejszy poziom wiedzy pozwala na modelowanie własności łożysk foliowych przede wszystkim na podstawie badań eksperymentalnych, gdyż dotychczas opracowane modele obliczeniowe nie pozwalają na otrzymanie wiarygodnych wyników. W niniejszej pracy przedstawiono wstępny etap prac nad modelowaniem strukturalnej warstwy nośnej łożyska foliowego. Opracowano model dyskretny fragmentu folii gładkiej i falistej oraz przeprowadzono symulację komputerową pracy takiego układu. Otrzymany model numeryczny został następnie zweryfikowany eksperymentalnie. Uzyskano dużą zgodność wyników symulacji i eksperymentu, co świadczy o dużej przydatności opracowanego modelu w przewidywaniu własności łożysk foliowych.
    Foil bearings fulfil most of the requirements of novel oil-free turbomachinery. Only the experimental investigation of foil bearings giving us the fundamental knowledge of their behaviour, because of the luck of good numerical models. This work presented the preliminary stage of numerical modelling of the structural layer of foil bearing. The FEM model of bump and top foil was prepared and mutual motion was analyzed. The results of FEM model were verified experimentally. A good agreement between numerical simulation and experiment was obtained.
    Źródło:
    Acta Mechanica et Automatica; 2008, 2, 1; 45-50
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rotor blade vibration simulator of steam turbine with aliasing frequencies up to 25 Hz
    Autorzy:
    Piechowski, L.
    Rządkowski, R.
    Troka, P.
    Piechowski, P.
    Szczepanik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/175409.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tip-timing
    rotor blade vibration
    blade vibration simulator
    Opis:
    The tip-timing measurement of rotor blade vibration of a real turbine is very expensive. An electronic simulator of unshrouded steam turbine rotor blade vibrations for aliasing frequencies up to 25 Hz is presented in this paper. The results of the simulated blade vibrations were compared with ones carried out on a real steam turbine. The simulator can be also used to: calibrate the measurement channels, help in the designing and manufacturing new tip-timing systems, and check the reliability of other tip-timing systems.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 134; 121-129
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Free vibrations analysis of shrouded bladed discs with one loose blade
    Autorzy:
    Rządkowski, R.
    Kwapisz, L.
    Drewczyński, M.
    Szczepanik, R.
    Rao, J.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955347.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska
    Tematy:
    blade
    shrouded bladed disc
    free vibration
    Opis:
    As a failure of rotor blades in a gas turbine was reported, the rotating-mode shapes of flexible shrouded bladed disc assemblies were calculated using a finite element approach. Rotational effects, such as centrifugal stiffening were accounted for, and all couplings between the flexible parts were allowed. The spin softening effects were neglected. A dynamic analysis of the shrouded bladed disc demonstrated that it was designed with a sufficient safety region of resonance. In case of one blade getting loose, it is vibrating in resonance.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 1; 83-95
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic analysis of first stage compressor bladed disk of an aircraft engine
    Analiza dynamiczna ułopatkowanej tarczy pierwszego stopnia sprężarki silnika lotniczego
    Autorzy:
    Rzadkowski, R.
    Drewczyński, M.
    Soliński, M.
    Maurin, A.
    Maciejewska, A.
    Szczepanik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/257863.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
    Tematy:
    łopatka wirnikowa
    tarcza ułopatkowana
    drgania wymuszone
    rotor blades
    bladed disk
    forced vibration
    Opis:
    There have been a number of SO-3 first stage compressor blade failures. An experiment was carried out on a first stage rotor blade in the compressor of an SO-3 engine at the Air Force Institute of Technology in Warsaw. The natural frequencies of rotor blades were measured. Next, the tip-timing measurement of rotor blade was done in an engine working at various speeds. Various operation conditions were assumed, such as the presence of a foreign object in the engine inlet. Structure and flow calculations were carried out to compare the experimental results. An FEM was used to calculate the natural frequencies of a mistuned bladed disk. The FLUENT code was used to calculate the unsteady forces acting on rotor blades. The mistuned bladed disk was forced to vibrate when rotating at 15000 rpm.
    Odnotowano wiele uszkodzeń łopatek wirnikowych pierwszego stopnia sprężarki silnika SO-3. W Instytucie Technicznym Wojsk Lotniczych w Warszawie przeprowadzono cykl eksperymentów na łopatkach wirnikowych pierwszego stopnia sprężarki silnika SO-3. Zmierzono częstotliwości drgań własnych łopatek wirnikowych. Wykonano pomiary przemieszczeń łopatek wirnikowych metodą tip-timing dla różnych prędkości obrotowych wirnika. W trakcie badań uwzględniono także obecność obcego ciała we wlocie silnika. Przeprowadzono obliczenia numeryczne przepływu w pierwszym stopniu sprężarki i drgającej ułopatkowanej tarczy, w celu porównania z wynikami otrzymanymi z badań eksperymentalnych. Metoda elementów skończonych zastosowana została do analizy drgań wymuszonych ułopatkowanej tarczy z łopatkami różniącymi się wymiarami geometrycznymi, dla nominalnej prędkości obrotowej n=15 000 obr./min. Program FLUENT zastosowany został do obliczenia niestacjonarnych sił działających na łopatki wirnikowe.
    Źródło:
    Problemy Eksploatacji; 2011, 1; 157-165
    1232-9312
    Pojawia się w:
    Problemy Eksploatacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary studies of riveted joints at feed force
    Autorzy:
    Bielawski, R.
    Kowalik, M.
    Rządkowski, W.
    Pyrzanowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/102917.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    laminates
    damage mechanics
    mechanical testing
    joints
    joining
    Opis:
    The aim of the study was to determine the feasibility of riveted joints in composites materials. Static tensile test method was used. In the test one type of glass fabric was used (Interglas 92140) from which two types of composite samples were prepared. In each sample the same type of fiber with the same fiber orientation – 3 layers - was used. The samples had dimensions of 100×100 mm and thickness of approximately 1 mm. The composite probes were located in a metal frame with a screw connection which was made of screws with nominal thread pitch M5. Screws were tightened with constant torque. It was to provide an axial force to the sample during the tensile test. The frame was placed between cross-bars of tensile machine INSTRON 8516. The samples were stretched at a speed of 0.05 mm/s at a distance up to 15 mm. During the tensile test displacement of the samples and pull force were registered. Depending on the fibre orientations and the value of feed force, damage models were described. On the basis of the results the possibility of usage of aluminium rivet nuts connections in composite materials was determined.
    Źródło:
    Advances in Science and Technology. Research Journal; 2015, 9, 27; 23-27
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Study on the Riveted Joints in Glass Fibre Reinforced Plastics (GFRP)
    Autorzy:
    Bielawski, R.
    Kowalik, M.
    Suprynowicz, K.
    Rządkowski, W.
    Pyrzanowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/139928.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laminates
    mechanical properties
    damage mechanics
    mechanical testing
    riveted joint
    mechanical joining
    laminaty
    właściwości mechaniczne
    mechanika uszkodzeń
    badania mechaniczne
    złącze nitowane
    łączenie mechaniczne
    Opis:
    The aim of the paper is to validate the use of measurement methods in the study of GFRP joints. A number of tests were carried out by means of a tensile machine. The studies were concerned with rivet connection of composite materials. One performed two series of tests for two different forces and two fibre orientations. Using Finite Element Method (FEM) and Digital Image Correlation (DIC), strain maps in the test samples were defined. The results obtained with both methods were analysed and compared. The destructive force was analysed and, with the use of a strain gauge, the clamping force in a plane parallel to the annihilated sample was estimated. Destruction processes were evaluated and models of destruction were made for this type of materials taking into account their connections, such as riveting.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 3; 301-313
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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