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    Wyświetlanie 1-3 z 3
    Tytuł:
    Experimental analysis of transverse stiffness distribution of helical compression springs
    Autorzy:
    Baran, Robert
    Michalczyk, Krzysztof
    Warzecha, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2204649.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    helical spring
    coil spring
    transverse stiffness
    end coils
    stiffness distribution
    Opis:
    This paper presents the results of an experimental analysis of the distribution of transverse stiffness of cylindrical compression helical springs with selected values of geometric parameters. The influence of the number of active coils and the design of the end coils on the transverse stiffness distribution was investigated. Experimental tests were carried out for 18 sets of spring samples that differed in the number of active coils, end-coil design and spring index, and three measurements were taken per sample, at two values of static axial deflection. The transverse stiffnesses in the radial directions were tested at every 30 angle. A total of 1,296 measurements were taken, from which the transverse stiffness distributions were determined. It was shown that depending on the direction of deflection, the differences between the highest and lowest value of transverse stiffness of a given spring can exceed 25%. The experimental results were compared with the results of the formulas for transverse stiffness available in the literature. It was shown that in the case of springs with a small number of active coils, discrepancies between the average transverse stiffness of a given spring and the transverse stiffness calculated based on literature relations can reach several tens of percent. Analysis of the results of the tests carried out allowed conclusions to be drawn, making it possible to estimate the suitability of a given computational model for determining the transverse stiffness of a spring with given geometrical parameters.
    Źródło:
    Acta Mechanica et Automatica; 2023, 17, 1; 95--103
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ehksperimental'noe obosnovanie razchetnojj modeli gorizontal'no nagruzhennykh svajj s ehksponencial'nym raspredeleniem koehfficienta zhestkosti osnovanija
    Experimental reasonabless of model horizontally loaded piles whith exponentially distributed stiffness coefficient of grounds
    Autorzy:
    Luchkovskijj, I.
    Esakova, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/78203.pdf
    Data publikacji:
    2014
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    pile
    horizontal load
    distribution coefficient
    compliance
    stiffness distribution
    model testing
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 6
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stiffness characteristics and thermal deformations of the frame of high power marine engine
    Autorzy:
    Murawski, L.
    Szmyt, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/260332.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    marine main engine
    main bearing
    static and dynamic stiffness characteristics of bearing
    thermal deformation
    temperature distribution
    Opis:
    In the subject-matter literature detail data on stiffness of the crankshaft foundation connected with the frame of marine main engine are still lacking. Thermal deformation models of the engine’s casing, proposed by engine producers, are excessively simplified. However the parameters are crucial for the shaft-line alignment analysis as well as for the analysis of interactions between the shaft-line and engine crankshaft, especially in the case of high power engines. This paper presents a determination method of the marine engine body characteristics as well as results of example computations performed for a Sulzer 7 RTA 84 C engine installed on a ~3000 TEU container ship. It has been demonstrated that the producer’s assumption about parallel displacement of the crankshaft axis in thermal working conditions is too rough. The thermal deformation of the engine is of hogging character, which results in significant change of the moment load exerted on the crankshaft and shaft line. The stiffness parameters recommended by the producers for the shaft-line alignment are estimated correctly, however they represent only engine’s body flexibility, without taking into account ship’s hull flexibility.
    Źródło:
    Polish Maritime Research; 2007, 1; 16-22
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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