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    Wyświetlanie 1-4 z 4
    Tytuł:
    Model considering residual stiffness and stiffness discontinuity of bolted joints
    Autorzy:
    Wang, Sheng-Ao
    Zhu, Min
    Xu, Zi-Jian
    Guo, Ming
    Li, Biao
    Wu, Fei
    Powiązania:
    https://bibliotekanauki.pl/articles/2087050.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    nonlinear dynamic behaviour
    Iwan model
    energy dissipation
    Opis:
    The nonlinear dynamic behavior has an important impact on energy dissipation and vibra- tion damping characteristics of bolted joints. Firstly, the development of tangential dynamic models is summarized and analyzed. Secondly, a five-parameter Iwan model based on a trun- cated power-law distribution is proposed. The backbone and hysteresis curves are obtained. Thirdly, normalized and dimensionless analysis is performed. On the basis of the above, a more concise four-parameter Iwan model with stiffness continuity is proposed. Finally, the validity of the model is verified by comparing the energy dissipation vs excitation force amplitude curve with the experimental data.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 1; 63--75
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental investigation for non-linear vibrations of free supported and cantilever FFF rectangular plates
    Autorzy:
    Abdeddine, E.
    Majid, A.
    Beidouri, Z.
    Zarbane, Kh.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200580.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    fused filament
    nonlinear dynamic behaviour
    nonlinear transverse vibrations
    nieliniowe zachowanie dynamiczne
    nieliniowe drgania poprzeczne
    Opis:
    Purpose: The aim of this paper is to investigate experimentally the effect of large vibration of a cantilever and a fully free rectangular plate made by a Fused Filament Fabrication process. Furthermore, this investigation attempts to compare our measurements and those obtained in the literature experimentally. Design/methodology/approach: For this purpose, a test rig was designed and manufactured for all experimental trials. The plate was excited randomly and harmonically at large displacement respectively, to obtain the linear and non-linear frequencies parameter. Findings: The non-linear dynamic behaviour of our structure at forced vibration is figured by exciting the plate at large displacement. The dependence of frequency and amplitude vibration are examined for the first, second, and third mode shapes. The non-linear dynamic behaviour of cantilever plates is compared with literature to illustrate the convergence of our results by using our specific mechanical properties, printing parameters, and process. Furthermore, the non-dimensional comparison is shown by 33.38%, 5.83%, and 20.58% for the first, second, and third mode shapes, respectively. Research limitations/implications: Experimental tests will be performed on a 3D-printed metal plate to improve the present work. Practical implications: This work is intended to determine the dynamic proprieties of our parts in order to manufacture a safe and comfort machine. Originality/value: Actually, the dynamic behaviour of our 3D printing plates is compared with the obtained in the case of the isotropic plate for the aim to predict the convergence of both structures.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 116, 2; 49--56
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Force Modeling and Dynamic Behaviour of Multi-Dimensional Vibration Assisted Micro-End Milling: Linear and Nonlinear Analyses
    Autorzy:
    Sobamowo, M. G.
    Ojolo, S. J.
    Olawale, O. K.
    Adesina, O. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030114.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Dynamic analysis
    Micro-milling
    Multidimensional vibration
    Stability
    Vibration assisted micro-milling
    Opis:
    The concept of component miniaturization is core in the production of sensitive components of the micro, nano and meso-scale. Vibration assisted micro-end milling is a miniaturized machining method that effectively produce these components. This paper presents the linear and nonlinear models describing the vibratory behavior of the sensitive system bearing in mind the amplitude stability phenomenon. The linear case is considered and solved analytically, the non-linear case is solved using differential transform method. With the aid of the developed solutions, parametric studies are carried out and the results are discussed. It is hope that the present study will help the manufacturing industry’s desire for maximizing metal removal rates while maintaining acceptable surface finish and tool life especially in the micro machining of various components for industrial applications, medical and energy industries.
    Źródło:
    World Scientific News; 2020, 143; 224-261
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study of the nonlinear behaviour of deep-sea mooring polyester fibre ropes
    Autorzy:
    Zhang, He
    Zeng, Ji
    Jin, Bowen
    Chou, Chiate
    Li, Hangyu
    Dong, Hailei
    Powiązania:
    https://bibliotekanauki.pl/articles/34611198.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    polyester fibre ropes
    static stiffness
    creep coefficient
    long-term cyclic loads
    dynamic stiffness
    Opis:
    Mooring ropes are essential components of ships and offshore floating structures and they are subjected to cyclic axial loads. This study investigates the evolution of the full-cycle stiffness of fibre polyester ropes under long-term static and dynamic loading. First, the static stiffness characteristics of the ropes, including the rope elongation properties at different stages, shrinkage rates, and creep coefficients after an idle period, are examined under static loads; an empirical formula for static stiffness is established. Second, the dynamic stiffness characteristics of the ropes are investigated under cyclic loads that are typical of platform production operations. The stabilities of the structure under different tensions are compared; the effects of mean tension, tension amplitude, and load cycle on the dynamic stiffness of the ropes are analysed and an empirical formula is established to predict the dynamic stiffness during the engineering design phase. The results of this study can be helpful for the rational design of deep-sea taut-leg mooring systems because they present the evolution of the full-cycle stiffness characteristics of mooring ropes.
    Źródło:
    Polish Maritime Research; 2023, 3; 153-162
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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