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    Wyświetlanie 1-8 z 8
    Tytuł:
    A simple formula for predicting the first natural frequency of transverse vibrations of axially loaded helical springs
    Autorzy:
    Michalczyk, Krzysztof
    Bera, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/282017.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    helical springs
    natural frequencies
    helical spring vibrations
    transverse vibrations
    helical spring stability
    Opis:
    A new formula that allows the first natural frequency of transverse vibrations of axially loaded steel helical springs to be determined has been presented in the paper. The relationship is easy to use and allows finding the first natural frequency of spring vibrations without the necessity of solving analytical or numerical models. According to the authors’ knowledge, this is the first such a formula and, consequently, when this frequency becomes zero, it enables determination of the critical axial force or deflection causing the buckling of the spring. The way of obtaining the described formula is presented in the paper. The results of this formula are compared with those obtained using FEM and experiments. The advantages, drawbacks and limitations of the proposed relationship are also discussed.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 779-790
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of support compliances on stability and limiting slenderness ratio of compression helical springs
    Autorzy:
    Krużelecki, J.
    Szubartowski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/281637.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    helical spring
    stability
    support compliance
    slenderness ratio
    Opis:
    In the paper, the influence of support compliances on the stability and the limiting slenderness ratio of compression helical springs was investigated. To analyze the stability of helical springs, the concept of an equivalent column was applied and a general system of supports described by three independent compliances was utilized. In the general case, the solution obtained, which describes the critical force, depends on two rotational compliances and a lateral compliance of a transverse shift of the support. The influence of the individual compliances on the critical load and on the limiting slenderness ratio was studied. Simple approximation formulas were proposed to describe these relationships.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2014, 52, 1; 81-92
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new method for generating virtual models of nonlinear helical springs based on a rigorous mathematical model
    Autorzy:
    Michalczyk, Krzysztof
    Warzecha, Mariusz
    Baran, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/30148247.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    helical spring
    spring design
    spring stiffness
    load-deflection curve
    spring geometry
    Opis:
    This paper presents a new method for generating nonlinear helical spring geometries based on a rigorous mathematical formulation. The model was developed for two scenarios for modifying a spring with a stepped helix angle: for a fixed helix angle of the active coils and for a fixed overall height of the spring. It allows the development of compression spring geometries with non-linear load-deflection curves, while maintaining predetermined values of selected geometrical parameters, such as the number of passive and active coils and the total height or helix angle of the linear segment of the active coils. Based on the proposed models, Python scripts were developed that can be implemented in any CAD software offering scripting capabilities or equipped with Application Programming Interfaces. Examples of scripts that use the developed model to generate the geometry of selected springs are presented. FEM analyses of quasi-static compression tests carried out for these spring models showed that springs with a wide range of variation in static load-deflection curves, including progressive springs with a high degree of nonlinearity in characteristics, can be obtained using the proposed tools. The obtained load-deflection curves can be described with a high degree of accuracy by power function. The proposed method can find applications in both machine design and spring manufacturing.
    Źródło:
    Applied Computer Science; 2023, 19, 2; 96-111
    1895-3735
    2353-6977
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Analysis of lateral vibrations of the axially loaded helical spring
    Autorzy:
    Michalczyk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/279466.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    helical spring vibrations
    axially loaded spring
    coil spring
    Timoshenko equivalent beam
    Opis:
    It is shown in this paper that the proposed concept by Krużelecki and Życzkowski (1990) of the equivalent rod can be applied in calculations of natural lateral vibrations of springs and that the obtained results will be nearer FEM results than the standard model based on the Timoshenko equivalent beam. The model, created on this base, allows one to calculate natural frequencies of the clamped-clamped spring. It is also shown that models based on the equivalent beam concept, which are easier to apply than the models treating the spring as the spatially curved rod, have only a slightly smaller accuracy. It is also indicated that in the most common practice making of manufacturing end coils of springs, the natural frequencies differ significantly from the frequencies calculated by means of all tested methods. The performed simulations show that differences between the first and the second as well as the third and the fourth natural frequency of the spring are small and, therefore, the axially symmetrical equivalent beam model can be used without a large error. The diagram allowing one to determine whether the desired frequencies are lower or higher than the cut-off frequency is developed for the presented model.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2015, 53, 3; 745-755
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Projektowanie sprężyny śrubowej naciskowej w Inventorze: weryfikacja modułu obliczeniowego generatora
    Design of helical compression spring in Inventor: verification of generators calculation module
    Autorzy:
    Maciejczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/311637.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    sprężyna śrubowa
    program Inventor
    projektowanie komputerowe
    helical spring
    Inventor programme
    computer-aided design
    Opis:
    W artykule omówiono konstrukcję śrubowej sprężyny naciskowej z użyciem generatora dostępnego w Inventorze. Wartości obciążeń niezbędne do wprowadzenia do modułu obliczeniowego generatora uzyskano metodami analitycznymi. Omówiono i przeanalizowano pracę generatora. Dokonano weryfikacji wyników obliczeń wytrzymałościowych otrzymanych podczas pracy modułu obliczeniowego generatora, z uzyskanymi w drodze obliczeń konwencjonalnych.
    The article discussed the design of the helical compression spring using generator available in Inventor. Necessary Load values for the calculation module of the generator obtained by analytical methods. Work of the generator was discussed and analyzed. Was verified the results of strength calculations obtained during operation calculation module generator with those obtained by conventional calculation.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 6; 925-929, CD
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural transverse vibrations of helical springs in sections covered with elastic coatings
    Autorzy:
    Michalczyk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200869.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    helical spring vibrations
    natural frequencies
    free transverse vibrations
    axially loaded spring
    spring with coatings
    drgania sprężyny śrubowej
    częstotliwości naturalne
    wolne wibracje
    Opis:
    It has been demonstrated in previous studies that local elastomer coatings covering the end coils of helical springs can efficiently reduce the amplitudes of circum-resonant vibrations in such springs. The analysis of the influence that elastic coatings have on the frequencies and modes of natural transverse vibrations of springs is presented in this paper. The concept of the equivalent beam of the Timoshenko type is utilized in calculations of the frequencies and modes of transverse vibrations. The model developed allows users to determine the frequencies and modes of symmetric as well as antisymmetric vibrations of axially loaded springs with elastic coatings of arbitrary length. A comparison of the results obtained using FEM analysis, in which the model represented the actual spring geometry, with the results obtained by means of the presented model indicates its high accuracy.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 6; 949-959
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Projektowanie adaptacyjnej sprężyny śrubowej naciskowej przy użyciu programu Inventor
    Design of adaptive compression helical spring using Inventor
    Autorzy:
    Maciejczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/314170.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    śrubowa sprężyna naciskowa
    program Inventor
    modele 3D
    compression helical spring
    App Inventor
    3D models
    Opis:
    W oparciu o przykładowy rysunek wykonawczy śrubowej sprężyny naciskowej, w artykule przedstawiono i omówiono krok po kroku procedurę projektowania adaptacyjnej sprężyny śrubowej z wykorzystaniem programu Inventor Professional. Sprężyna została zamodelowana w stanie swobodnym. Skonstruowaną sprężynę adaptacyjną umieszczono w uproszczonym modelu złożenia. W złożeniu sprężyna powinna mieć wysokość zmontowania. Wykazano, że w zależności od potrzeb, możliwe są płynne zmiany wysokości sprężyny.
    Based on a sample technical drawing of the helical compression spring, are presented and discussed step by step procedure for designing adaptive helical spring, using Inventor Professional. The spring has been modeled in a free state. Constructed adaptive spring placed in the simplified assembly model. In an assembly, the spring must have the height of the assembly. It has been shown that depending on the needs, there are possible a smooth changes of the spring height.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 12; 1174-1177
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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