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Wyszukujesz frazę "Torsional Vibration" wg kryterium: Temat

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    Wyświetlanie 1-6 z 6
    Tytuł:
    The effect of liquid temperature and viscosity on the amplitude-frequency characteristics of a viscotic torsion damper
    Autorzy:
    Homik, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/963357.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    torsional vibration
    torsional vibration damping
    torsional vibration dampers
    crankshaft
    amplitude-frequency characteristics
    liquid viscosity
    damper metric
    Opis:
    The article discusses causes of the appearance of transverse, longitudinal and torsional crankshaft vibrations in multi-cylinder internal combustion engines. Particular attention is paid to the torsional vibration which is the most severe threat to engine crankshafts. Damping methods making use of torsion dampers are presented. With the reference to viscotic dampers, problems with their damping efficiency are discussed in the context of viscosity changes of the damping liquid. The article also presents the amplitude-frequency characteristics of a series of viscotic dampers, which were recorded experimentally on the research rig and on a real object. An idea of vibration damper metric is given.
    Źródło:
    Polish Maritime Research; 2012, 4; 71-77
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Damping of torsional vibrations of ship engine crankshafts – general selection methods of viscous vibration damper
    Autorzy:
    Chomik, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/260606.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    torsional vibrations
    torsional vibration damping
    torsional vibration dampers
    crankshaft
    natural vibration frequency
    Opis:
    This paper describes causes of torsional vibrations generated in ship engine crankshafts. Means for damping the torsional vibrations as well as general methods for selection of viscous torsional vibration dampers for a given type of engine are also presented. Exemplary results of calculations connected with selection of a viscous torsional vibration damper intended for a six-cylinder engine, are attached.
    Źródło:
    Polish Maritime Research; 2011, 3; 43-47
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    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:
    Research on rub-impact loads response of ship shafting
    Autorzy:
    Dong, L.
    Shi, Y.
    Wang, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/260309.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    rub-impact
    Torsional Vibration
    Test Rig
    Rubbing Generator
    Opis:
    The anti-impact ability of shafting affects stability and security of the ship power transmission directly. Moreover, it also cannot be ignored that the rub-impact loads have influence on the torsion vibration of ship shafting. In order to solve the problem of engineering application of reliability assessment under rub-impact loads, a test rig with rubbing generator is established. By carrying out the integrative analysis, the torsional vibration characteristics, such as vibration amplitude and orbit of axle center under the rub impact load are studied. According to the rub-impact conditions obtained through numerical simulation, the experimental verification is carried out on the test rig with rubbing generator. The results show that it is not obvious the influence of rub-impact loads upon the shafting torsion vibration except in special working conditions, that can be simulated by the rubbing generator. The maximum amplitude of torsional vibration is influenced by the radial rigidity as well as the friction coefficient of rubbing body, and the degree of influence is difference under conditions of continuous rubbing and serious rubbing. By adjusting the rigidity of stern bearing, the influence of rub-impact upon shafting can be weaken, which provides a theoretical reference for the safety evaluation of ship shafting.
    Źródło:
    Polish Maritime Research; 2018, S 2; 85-91
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dilatant-fluid torsional vibration damper for a four-stroke diesel engine crankshaf
    Autorzy:
    Kozytskyi, Sergiy
    Kiriian, Sergii
    Powiązania:
    https://bibliotekanauki.pl/articles/32917498.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    torsional vibration damper
    dilatant fluid
    non-Newtonian flow
    flow index
    parameter of effectiveness
    Opis:
    This paper presents a study of a viscous torsional vibration damper for a crankshaft of a four-stroke diesel engine. The reliable operation of a widely used silicone-type viscous damper depends on the ability of the silicone oil to absorb the energy of torsional vibrations. The non-Newtonian shear flow of the silicone oil interlayer, characterised by a reduction in the shear-rate-dependent viscosity and a moment of the drag forces, negatively affects damping characteristics. A torsional vibration damper, filled with a shear-thickening fluid, was considered and a rheological approach, based on viscosity growth with the shear rate increase, was applied. For such a damper, larger velocity gradients correspond to the higher values of a viscous force, which decreases torsional vibration. The parameter of damper effectiveness (defined by the fluid flow index, values of the damper gaps, torsional vibration amplitude and frequency) was implemented. It has been established that the efficiency of the torsional vibration damper filled with a dilatant fluid does not depend on the damper dimensions and gaps and significantly increases when a shear-thickening fluid is used instead of silicone oil or a Newtonian fluid. At higher values of the flow index, when the non-Newtonian flow becomes distinct, torsional vibrations are damped more effectively. Critical vibration amplitudes at high-velocity gradients, in turn, increase the damping effect as the moment of the drag forces and flow index are power-law related.
    Źródło:
    Polish Maritime Research; 2023, 1; 121-125
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagnostics, maintenance and regeneration of torsional vibration dampers for crankshafts of ship diesel engines
    Autorzy:
    Homik, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/259223.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    crankshaft
    torsional vibrations
    damping of torsional vibrations
    torsional vibration dampers
    durability and reliability of multi-cylinder engine
    diagnostics
    maintenance
    regeneration
    Opis:
    Periodically changeable gas and inertia forces which occur during operation of engine generate transverse, axial and torsional vibrations of crankshafts of multi-cylinder combustion engines. Torsional vibrations are those which endanger crankshafts of multicylinder combustion engines the most. In order to minimize their impact a torsional vibration damper is installed at crankshaft’s free end. Its technical state directly influences lifetime and reliability of engine. In this paper methods of diagnosing, maintenance and regeneration of torsional vibration dampers used in shipbuilding, are discussed. Also, are presented results of multi-year statistical investigations carried out in cooperation with a firm maintaining and regenerating ship engine torsional vibration dampers, which illustrate types of failures occurring in viscous and spring torsional vibration dampers.
    Źródło:
    Polish Maritime Research; 2010, 1; 62-68
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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