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    Wyświetlanie 1-7 z 7
    Tytuł:
    Decreasing of vibration load level on tractor operator’s working place by means of using of vibrations dynamic dumpers in cabin suspension
    Autorzy:
    Shekhovtsov, K. V.
    Sokolov-Dobrev, N. S.
    Pobedin, A. V.
    Liashenko, M. V.
    Shekhovtsov, V. V.
    Potapov, P. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/243907.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    tractor cabin
    suspension
    standard vibroisolator
    dynamic vibration damper
    Opis:
    This paper is devoted to describing of method of decreasing of vibration load level on tractor operator’s working place by means of using of vibrations dynamic dampers in cabin suspension (on other words – dynamic absorbers of dynamic vibroisolators). Standard cabin vibroisolators of tractors DT and VT series include monolith rubber block and have limited capabilities to change its elastic parameters adaptively during impact of vertical and lateral vibration loads with various frequencies. Elastic-damping properties of these vibroisolators does not allow to provide comfortable conditions for operator work because their abilities of vibration damping are not enough especially at low-frequency vibrations. Dynamic vibration dampers installed in cabin suspension were proposed by authors for decreasing of vibration load level on operator workplace. These dampers include additional masses connected to main mass due to elastic-damping elements. Several variants of dynamic vibroisolators schemes were proposed by authors. These schemes differ in quantity of additional masses (one, two or three) and type of connection between additional masses and main mass due elastic-damping elements (parallel or in series). Three-dimensional model of caterpillar chassis, suspension, engine, cabin and operator’s seat of tractor was created in software “Universal mechanism” for performing of computational research. On this model, researches of vibration of sprung mass were made for tractor motion with and without hook load at 3rd and 7th gears on smooth surface and on testing areas with single, periodic and random bumps. Research results indicate undoubtedly best vibroprotective properties of cabin’s suspensions with dynamic vibroisolators.
    Źródło:
    Journal of KONES; 2015, 22, 1; 276-284
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic vibration extinguished on a viscously elastic base
    Autorzy:
    Ishmamatov, M.
    Kulmuratov, N.
    Khalilov, S.
    Akhmedov, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839871.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    tłumik dynamiczny
    oscylacja
    lepkosprężystość
    dynamic damper
    oscillations
    viscoelastic plate
    integro-differential equation
    amplitude-frequency dependence
    Boltzmann-Voltaire integral
    Opis:
    The aim of the work is to develop algorithms and a set of programs for studying the dynamic characteristics of viscoelastic thin plates on a deformable base on which it is installed with several dynamic dampers. The theory of thin plates is used to obtain the equation of motion for the plate. The relationship between the efforts and the stirred plate obeys in the hereditary Boltzmann Voltaire integral. With this, a system of integro-differential equations is obtained which is solved by the method of complex amplitudes. As a result, a transcendental algebraic equation was obtained to determine the resonance frequencies, which is solved numerically by the Muller method. To determine the displacement of the point of the plate with periodic oscillations of the base of the plate, a linear inhomogeneous algebraic equation was obtained, which is solved by the Gauss method. The amplitude - frequency response of the midpoint of the plate is constructed with and without regard to the viscosity of the deformed element. The dependence of the stiffness of a deformed element on the frequency of external action is obtained to ensure optimal damping of vibrational vibrations of the plate.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 1-10
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parameters identification of Bodner-Partom model for fluid in MR damper
    Autorzy:
    Skalski, P.
    Woźnica, K.
    Bajkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/387208.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    dynamika
    tłumik magnetoreologiczny
    dynamika amortyzatora
    dynamic
    damper dynamics
    magnetorheological damper
    damper
    Opis:
    This paper presents an approach to describe a dynamic behaviour of magnetorheological damper by the Bodner-Partom constitutive law. The B-P equations usually used for metals are presented for shear stresses to express viscoplastic proprieties of MR fluid. Material parameters for the B-P law for fluid in the LORD RD 1005-3 damper are determined. Experimental results are compared with numerical results.
    Źródło:
    Acta Mechanica et Automatica; 2009, 3, 4; 62-64
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrodynamic performance analysis of a modified sandglass-type FPSO in regular waves using boundary element method
    Autorzy:
    Graylee, Adeleh
    Yousefifard, Mahdi
    Powiązania:
    https://bibliotekanauki.pl/articles/1819078.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    sandglass FPSO
    BEM
    regular wave
    roll damper
    dynamic motions
    ANSYS-AQWA
    Opis:
    This paper presents a numerical investigation of the hydrodynamic performance of a modified sandglass-type FPSO (Floating Production, Storage and Offloading) with different geometrical parameters. The influence of the roll damping plate on heave and pitch motions of the FPSO was studied in regular waves. To estimate the hydrodynamic performance and utilize the results on the design stage of the FPSO, the boundary element method (BEM) was used. Furthermore, the hydrodynamic performance of two cylindrical and sandglass-type FPSOs under the same conditions was compared in different waves. Five sandglass-type FPSOs with dissimilar inclination angles were utilized with the constant draft. The effects of different inclination angles, including various radii of water-plane part of the floating object on hydrodynamic responses and wave forces applied to the FPSO, were investigated, and presented here. Numerical results were compared against published experimental data of a sandglass-type model, and good agreement was achieved. Based on the simulation results, a conclusion that a sandglass-type FPSO with the inclination angle of 35 degrees proposes proper hydrodynamic performance in both heave and pitch motions for all ranges of wave frequencies was reached. In addition, as it was predicted, the effect of heading sea on a sandglass-type FPSO was significant compared to other wave directions. Finally, by adding a damper plate to the floor of the platform, its hydrodynamic performance is improved. For numerical analysis of the modified FPSO, three different damper sizes are used to investigate its effect on the reduction of the pitch motion amplitude in waves.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 64 (136); 25-35
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Viscoelastic Material as Energy Dissipater Viscoelastic Damper for Building Structures to Mitigate the Seismic Vibration
    Autorzy:
    Sarwar, Waseem
    Powiązania:
    https://bibliotekanauki.pl/articles/396698.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    viscoelastic material
    viscoelastic damper
    dynamic mechanical analysis
    dynamic properties
    seismic control
    materiał lepkosprężysty
    tłumik lepkosprężysty
    dynamiczna analiza mechaniczna
    właściwości dynamiczne
    kontrola sejsmiczna
    Opis:
    The supplemental energy dissipation system is a practical approach to attenuate the structural response under extreme loading. Viscoelastic damping used to reinforce the structure against the seismic vibration, Viscoelastic material (VEM) most commonly used in viscoelastic dampers (VEDs). In this paper, dynamic mechanical analysis (DMA) approach is used to investigate the performance index of VEM. It is demonstrated that the performance index, such as storage modulus, loss modulus, and loss factor decrease noticeably as the temperature increases, which reflects the low stiffness at high temperature. Excitation frequency also influenced the performance index, and the reaction has correspondence to temperature. As the temperature increases, the VEM dynamic properties decreases, which represents the rubbery region, and it is found that higher to low-temperature dynamic properties increases, which the glassy region is. DMA is a particularly flexible approach, and it characterizes the properties of VEM simultaneously at various conditions.
    Źródło:
    Civil and Environmental Engineering Reports; 2019, 29, 2; 41-49
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Approximate method for determination of dynamic characteristics of structures with viscoelastic dampers
    Autorzy:
    Lewandowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/127718.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    structures
    viscoelastic damper
    generalized fractional model
    dynamic characteristics
    struktury
    tłumik lepkosprężysty
    uogólniony model ułamkowy
    charakterystyka dynamiczna
    Opis:
    An approximate method for determination of dynamic characteristics of structures with viscoelastic dampers is proposed in this paper. A fractional derivative is used to describe the dynamic behaviour of viscoelastic dampers. The method is based on a continuous dependency of the sensitivity of eigenvalue on a certain artificially introduced parameter which scaled up the influence of the damping term in the eigenvalue problem. Some results of a representative calculation are also presented and briefly discussed.
    Źródło:
    Vibrations in Physical Systems; 2016, 27; 219-226
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the continuous dynamic absorbers in local and global vibration reduction problems in beams
    Autorzy:
    Łatas, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/128152.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    tuned mass damper
    dynamic vibration absorber
    continuous absorber
    beam vibration
    vibration control
    tłumik masowy strojony
    dynamiczny pochłaniacz drgań
    drgania belki
    sterowanie drganiami
    Opis:
    The paper deals with the application of the continuous dynamic absorbers in vibration reduction problems in beams. The Euler-Bernoulli beam of variable cross-section is subjected to the concentrated and distributed harmonic excitation forces. The beam is equipped with a system of the continuous vibration absorbers. The problem of the forced vibration is solved employing the Galerkin’s method and Lagrange’s equations of the second kind. Performing time-Laplace transformation the amplitudes of displacement may be written in the frequency domain, similarly the time-averaged kinetic energy of any part of the beam. The results of some local and global vibration control optimization problems concerning the placement and parameters of the continuous vibration absorbers are presented.
    Źródło:
    Vibrations in Physical Systems; 2016, 27; 245-254
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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