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    Wyświetlanie 1-7 z 7
    Tytuł:
    Parametric vibrations of pipes induced by pulsating flows in hydraulic systems
    Autorzy:
    Łuczko, J.
    Czerwiński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/281143.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    hydraulic systems
    flow-induced vibration
    parametric resonance
    Opis:
    The paper discusses the model of transverse vibrations of a pipe induced by flow velocity pulsation. The motion is described by a system of two non-linear partial differential equations with periodically variable coefficients. The analysis uses the Galerkin method with orthogonal polynomials as the shape functions. The instability regions are determined by Floquet’s method. The influence of selected parameters on natural frequencies and on the character and level of vibrations is studied. The possibility of the excitation of periodic and quasi-periodic oscillations is demonstrated. The results of theoretical analysis are compared with the experimental data.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2014, 52, 3; 719-730
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study on vibration of a rotating pipe in still water and in flow
    Autorzy:
    Geng, Xinge
    Wu, Weiguo
    Liu, Erpeng
    Lin, Yongshui
    Chen, Wei
    Rheem, Chang-Kyu
    Powiązania:
    https://bibliotekanauki.pl/articles/32916494.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    flow-induced vibration
    rotating pipe
    vibration frequency
    whirl
    VIV
    Opis:
    To illustrate the vibration characteristics of a rotating pipe in flow, experiments were conducted for a pipe in flow, a rotating pipe in still water and a rotating pipe in flow. For the pipe in flow without rotation, the trajectory diagram is ‘8’ shaped. For the rotating pipe in still water, a multiple frequency component was induced, and a ‘positive direction whirl’ was found. For the flow and rotation, at a flow velocity of 0.46 m/s, the vibration is dominated by the combination of flow and rotation. With an increase in rotating frequency, the trajectory of the rotating pipe varies from an ‘8’ shape to a circular shape and the ‘reverse direction whirl’ is induced, which is different from ‘positive direction’ in still water. The vibration frequency ratio increases uniformly with flow velocity. At a flow velocity of 1.02 m/s, at which the frequency is close to the theoretical natural frequency, the vibration frequency ratio is f*≈1. Predominantly governed by vortex-induced vibration (VIV), the vibration behavior of a rotating pipe subjected to fluid flow conditions has been found to exhibit complete vanishing of whirl. The vibration characteristics of a rotating pipe in flow are studied by the experiments which is benefit for structural drilling design.
    Źródło:
    Polish Maritime Research; 2023, 1; 65-77
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fretting wear analysis of different tube materials used in heat exchanger tube bundle
    Autorzy:
    Abbas, T.
    Khushnood, S.
    Nizam, L. A.
    Usman, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/957958.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    fretting wear
    flow-induced vibration
    flexible tube
    cross flow velocity
    Opis:
    Research on heat exchange has been carried out for more than five decades because of its importance in process industries and power generation plants. Heat exchanger experiencing cross flow are vulnerable to flow-induced vibration. This vibration causes the interaction of tubes with the baffle resulting in a fretting wear of the tubes. The present study focuses on fretting wear analysis of different tube materials. Fretting wear tests were performed on aluminum, copper and stainless steel instrumented central tubes against mild steel baffle. For each tube material the tests were performed for three different test durations i.e. 60 minutes, 120 minutes and 180 minutes at a cross flow velocity of 0.55 m/s. It was observed that vibrational amplitude of the flexible test tube is affected by its weight. A scanning electron microscope was used to analyze and measure the sizes of wear scar. The results indicated that wear loss in case of aluminum tube is the highest while that in case of stainless steel tube is the lowest.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 4; 123-133
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Minimization of critical flow velocity of aeroelastic energy harvester via delayed feedback control
    Autorzy:
    Sarbinowski, Filip
    Starosta, Roman
    Powiązania:
    https://bibliotekanauki.pl/articles/2146571.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    energy harvesting
    delayed feedback control
    flow-induced vibration
    harvesting energii
    sprzężenie zwrotne z opóźnieniem
    drgania wzbudzone przepływem
    Opis:
    The paper describes the procedure of modelling and optimization of the aeroelastic energy harvester from the point of view of their operation at very low flow velocities. Using analytical solutions of models of different device variants, the relationships between their efficiency and flow velocity were presented. By way of analytical considerations, the conditions for high performance operation of the device have been demonstrated, indicating at the same time the difficulty in maintaining it at low operation velocities. As a solution to the problem, the application of external delayed feedback control was proposed and its effectiveness was demonstrated.
    Źródło:
    Vibrations in Physical Systems; 2020, 31, 2; art. no. 2020225
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vibrations of steel pipes and flexible hoses induced by periodically variable fluid flow
    Drgania sztywnych i elastycznych przewodów wzbudzonych okresowo zmiennym przepływem cieczy
    Autorzy:
    Czerwiński, A.
    Łuczko, J
    Powiązania:
    https://bibliotekanauki.pl/articles/368891.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    drgania wzbudzone przepływem
    rurociągi
    krytyczna prędkość przepływu
    rezonans parametryczny
    drgania chaotyczne
    flow-induced vibration
    pipeline
    critical flow velocity
    parametric resonance
    chaotic vibrations
    Opis:
    This paper is concerned with the analysis of a model describing the vibrations of simply supported straight pipes conveying periodically pulsating fluid. The vibrations of the hydraulic system are described by a fourth-order partial differential equation, with the inclusion of geometrical non-linearities. Through the application of the Galerkin method, the non-linear problem is reduced to the solution of four ordinary differential equations. The influence of several significant parameters of the model on the rms value of velocity is investigated. The possibility of exciting sub-harmonic and chaotic excitations at certain intervals of excitation frequency and flow velocity is presented.
    W pracy poddano analizie model opisujący drgania przegubowo podpartych prostoliniowych przewodów, spowodowane pulsacjami prędkości przepływającej cieczy. Ruch układu opisano równaniem różniczkowym cząstkowym czwartego rzędu, uwzględniającym nieliniowości geometryczne. Wykorzystując metodę Galerkina, zagadnienie rozwiązania równania różniczkowego cząstkowego sprowadzono do problemu analizy układu czterech równań różniczkowych zwyczajnych. Zbadano wpływ wybranych parametrów na wartość skuteczną prędkości drgań. Wykazano możliwość wzbudzania się w pewnych zakresach prędkości przepływu i częstości wymuszenia drgań podharmonicznych i chaotycznych.
    Źródło:
    Mechanics and Control; 2012, 31, 2; 63-71
    2083-6759
    2300-7079
    Pojawia się w:
    Mechanics and Control
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Effects of the Incident Flow Angle on Vibration Behavior in Heat Exchanger Tube Bundle
    Autorzy:
    Usman, Muhammad
    Khushnood, Shahab
    Nizam, Luqman Ahmad
    Tanveer, Waqas
    Shafi, Ahmad
    Ayub, Muhammad
    Khan, Hassan Farid
    Rustam, Behzad
    Powiązania:
    https://bibliotekanauki.pl/articles/102083.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    incident flow angle
    fluid elastic instability
    flow-induced vibration
    parallel triangular array
    cross flow velocity
    flexible tube
    kąt przepływu
    niestabilność sprężysta płynu
    drgania indukowane przepływem
    równoległy układ trójkątny
    prędkość przepływu poprzecznego
    elastyczna rura
    Opis:
    An experimental study on the incident flow angle effects on the vibration behavior was carried out on aluminum tube in parallel triangular tube bundle with P/D ratio of 1.375. Fluid elastic instability is the most fatal mechanism from all the vibration mechanisms and therefore must be dealt with a lot of attention. Experiments were performed on low speed water tunnel with the velocity of water ranges from 0.3 m/s to 0.7 m/s. The experiments were designed in a unique way to study the effects of incident flow angle on the vibration behavior. The monitored tube was mounted flexibly in an array of rigid tubes. The experiments were conducted on a flexible tube for different velocities ranging from 0.3 m/s to 0.7 m/s with different array rotated angles (0 to 90 degrees). It was observed that the vibration level was significantly high at 75 degree configuration as compared to other rotated angle configurations. It was also observed that the damping response is dispersed with all positive values, indicating that there is no instability in the tube.
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 2; 186-194
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of vortex-induced vibration response of deep sea top-tensioned riser in sheared flow considering parametric excitations
    Autorzy:
    Gao, Guanghai
    Cui, Yunjing
    Qiu, Xingqi
    Powiązania:
    https://bibliotekanauki.pl/articles/260560.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    top-tensioned riser
    vortex-induced vibration
    wake oscillator model
    time-varying axial tension force
    sheared flow
    Opis:
    It is widely accepted that vortex-induced vibration (VIV) is a major concern in the design of deep sea top-tensioned risers, especially when the riser is subjected to axial parametric excitations. An improved time domain prediction model was proposed in this paper. The prediction model was based on classical van der Pol wake oscillator models, and the impacts of the riser in-line vibration and vessel heave motion were considered. The finite element, Newmark-β and Newton‒Raphson methods were adopted to solve the coupled nonlinear partial differential equations. The entire numerical solution process was realised by a self-developed program based on MATLAB. Comparisons between the numerical calculation and the published experimental test were conducted in this paper. The in-line and cross-flow VIV responses of a real size top-tensioned riser in linear sheared flow were analysed. The effects of the vessel heave amplitude and frequency on the riser VIV were also studied. The results show that the vibration displacements of the riser are larger than the case without vessel heave motion. The vibration modes and frequencies of the riser are also changed due to the vessel heave motion
    Źródło:
    Polish Maritime Research; 2020, 2; 48-57
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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