stability of cracked fluid conveying pipeline on elastic

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stability of cracked fluid conveying pipeline on elastic

Flow-Induced Vibration Analysis of Supported Pipes

Dynamic analysis of supported pipes conveying pulsating fluid is investigated in Hamiltonian system using precise integration method (PIM).First,symplectic canonical equations of supported pipes are deduced with state variable vectors composed of displacement and momentum.Then,PIM with linear interpolation formula is proposed to solve these equations.Finally,this approach's precision is

verview of Mechanics of Pipes onveying FluidsPart I

Other topics related to this part include emote impact analysis and parameter identification,pipe amage-induced by pressure elastic waves,the dynamic response nd stability of long pipes,marine risers together with pipes asirating fluid,and carbon nanotubes conveying fluid.DOI 10.1115/1.4001271 verview of Mechanics of Pipes onveying FluidsPart I Other topics related to this part include emote impact analysis and parameter identification,pipe amage-induced by pressure elastic waves,the dynamic response nd stability of long pipes,marine risers together with pipes asirating fluid,and carbon nanotubes conveying fluid.DOI 10.1115/1.4001271

(PDF) DETECTION OF FAULTS IN PIPE THAT TRANSMITS

The fluid velocity can be expressed as follows Jweeg et al.[1] presented the dynamic behavior and the stability of pipes conveying fluid using a modern (1) analysis,such as Galerkins method to determine the The fluid acceleration can be expressed as follows frequencies in various conditions. presenting a crack in the pipe that (PDF) Dynamics and Stability of a Fluid Conveying Vertical The history of such analysis dates back over five decades when the vibration and stability of fluid conveying Trans-Arabian pipeline network was first studied; albeit for an on-shore environment

An efficient stochastic natural frequency analysis method

The flow-induced vibration and stability analysis of pipes conveying fluid have been studied comprehensively in past several decades (Ibrahim,2011).With the rapid development of FGM,the research of vibration analysis and dynamic behaviors on FGM pipes conveying fluid have also been carried out numerously.Analysis of Fluid-Solid Coupling Characteristics of Oil These factors included soil elastic coefficients at pipeline ends,span length,outer diameter,flow velocity and pressure inside pipeline,flow velocity and fluid damping outside the pipeline,density of conveying fluid,and the axially sectional force.

Author Yezhou Sheng,Changqing Guo and Weibin HongVibration and dynamic stability of pipes conveying fluid

Abstract.The paper deals with the vibration and dynamic stability of cantilevered pipes conveying fluid on elastic foundations.The relationship between the eigenvalue branches and corresponding unstable modes associated with the flutter of the pipe is thoroughly investigated.Cited by 10Publish Year 2004Author Bong Jo Ryu,Si-Ung Ryu,Geon Hee Kim,Kyung Bin Yim Finite Element Modeling and Stability Analysis of Translate this pageIn this paper,a finite element modeling is presented for the dynamical stability analysis of a conveying fluid pipeline span resting on elastic foundation.The finite element model leads to a coupled second order system of ordinary differential equations which can be

Cited by 1Publish Year 2014Author Ye Zhou Sheng,Chang Qing Guo,Wei Bin HongStability of cracked fluid-conveying pipeline on elastic

Stability of cracked fluid-conveying pipeline on elastic foundation under distributed .By Yezhou Sheng, crack,elastic foundation,pipe conveying fluid Dynamic Analysis of the Viscoelastic Pipeline Conveying Dynamic Analysis of the Viscoelastic Pipeline Conveying Fluid with an Improved Variable Fractional Order Model Based on Shifted frequencies on the pipeline was analyzed.He et al.[3] considered the elastic slender pipe and uniform most studies only focused on the inuence of system parameters on stability.

Dynamic Response of Pipe Conveying Fluid with Lateral

The Galerkin method is proposed to reveal the dynamic response of pipe conveying fluid (PCF),with lateral moving supports on both ends of the pipe.Firstly,the dynamic equation is derived by the Newtonian method after calculating the acceleration of the fluid element via the dynamics approach.Secondly,the discrete form of the dynamic equation is formulated by the Galerkin method.Dynamic Stability of Periodic Pipes Conveying Fluid In this paper,the stability of a periodic cantilevered pipe conveying fluid is studied theoretically by means of a novel transfer matrix method.This method is first validated by comparing the results to those available in the literature for a uniform pipe,showing that it is capable of high accuracy and displaying good convergence

Dynamic response of buried fluid-conveying pipelines

In this study,the dynamic response of buried fluid-conveying pipelines subjected to blast loading using the Love shell theory has been investigated.The fluid is considered as ideal fluid,and the velocity potential is used to describe the fluid pressure acting on the pipeline.The governing equations of the buried fluid-conveying pipelines are derived through Hamiltons principle.Dynamical Stability of Cantilevered Pipe Conveying Fluid Nov 27,2020·Argand diagram for a cantilevered pipe conveying fluid with DVA for k = 20,c = 0.5, = 0.001, = 0.1, = 0.213, b = 0.5.It is seen that the critical flow velocity for the whole system

Dynamical analysis of spinning functionally graded pipes

Jul 01,2020·For other fluid-conveying structures,Sheng and Wang ,Sheng and Wang and Shen et al.investigated the linear and nonlinear vibrations of FG cylindrical shells conveying fluid.Tang and Yang [25] ,Ansari et al.[26] and Bahaadini and Saidi [27] extended the investigations to the fluid-conveying FG nanotubes,microshells and reinforced pipes.Dynamical stability of cantilevered pipe conveying fluid When the velocity of fluid flow in a cantilevered pipe is successively increased,the system may become unstable and flutter instability would occur at a critical flow velocity.This paper is concerned with exploring the dynamical stability of a cantilevered fluid-conveying pipe with an additional linear dynamic vibration absorber (DVA) attachment.

Elastic Foundation Scientific.Net

Stability of Cracked Fluid-Conveying Pipeline on Elastic Foundation under Distributed Follower Forces Authors Ye Zhou Sheng,Chang Qing Guo,Wei Bin Hong Abstract The differential equation of fluid-conveying pipes considering distributed follower force and elastic foundation is established.Experimental Study and Analysis of Flow Induced Vibration D.S.WEAVER and B.MYKLATUN,On the stability of thin pipes with an internal fluid flow,Journal of sound and vibration (1973) 31(4),399-410.R.T.FALL and D.DERAKHSHAN,Flow Induced Vibration of pipeline on elastic support 12th East Asia-Pssific conference on structural engineering and construction,procedia Engg 14(2011) 2986-2993.

FEM Formulation for Dynamic Instability of Fluid-Conveying

In this study,we investigate the effect of a nonuniform Winkler-type elastic foundation on the stability of pipes conveying fluid fixed at the upstream end only.A stability analysis of transverse motion aims at determining the flutter velocity as a function of the governing control parameters such as fluid mass over the pipe mass ratio,or foundation stiffness.FEM Formulation for Dynamic Instability of Fluid-Conveying In this study,we investigate the effect of a nonuniform Winkler-type elastic foundation on the stability of pipes conveying fluid fixed at the upstream end only.A stability analysis of transverse motion aims at determining the flutter velocity as a function of the governing control parameters such as fluid mass over the pipe mass ratio,or foundation stiffness.

FEM formulation for dynamic instability of fluid-conveying

In this study,we investigate the effect of a nonuniform inkler-type elastic foundation on the stability of pipes conveying fluid fixed at the upstream end only.A stability analysis of transverse motion aims at determining the flutter velocity as a function of the governing control parameters such as fluid mass over the pipe mass ratio,or Influence of external loading on the stability of a fluid A section of a fluid-conveying pipeline is analyzed for stability.The section is modeled by an elastic cylindrical shell of finite length under external static loading.Two qualitatively different instability modes are studied quasistatic (divergence) and dynamic (flutter).

International Conference on Computer Information

Pipes conveying fluid have been widely used in many fields of industry.Considering the fluid is pulsatile,pipeline system may lose the stability by parametric resonances,which the pipeline vibration is continuous and the displacement is very large.Because dynamics of pipes conveying fluid are typicalLocal and global instability of fluid-conveying pipes on We investigate the relationship between the local and global bending motions of fluid-conveying pipes on an elastic foundation.The local approach refers to an infinite pipe without taking into account its finite ends,while in the global approach we consider a pipe of finite length with a given set of boundary conditions.Several kinds of propagating disturbances are identified from the

Numerical Analysis of Clamped Fluid Conveying Pipe

dynamics and stability of flexible pipe containing flowing fluid,where flow velocity is entirely constant or with a small harmonic component superposed.L.G.Oslon and D.Janison [13] investigated motion of elastic pipes conveying fluid for various idealized cases.Nomenclature.S No Symbols Description 1 p Density of pipe in (kg/m3)Numerical Study of Post-Buckling of Clamped-Pinned Pipe This research aims to calculate the first three natural frequencies and critical velocity of a fluid-conveying pipe are obtained with numerical approach with standard finite element method and this by discretizing the structure wall and internal flow,starting from beam type with two degrees of freedom per node.The determination is done to the vibrational equation from the fluid-structure

On the dynamic interaction of a pipe conveying fluid with

The problem of the dynamic stability of pipes conveying highspeed fluid and lying on an elastic foundation has been a subject of significant interest during the past 30 years due to the broad application of pipes as structural components in different technologies.The present study contributes to the solution of this problem,suggesting a new model of the foundationan infinitely deep Previous123456NextDynamical stability of cantilevered pipe conveying fluid When the velocity of fluid flow in a cantilevered pipe is successively increased,the system may become unstable and flutter instability would occur at a critical flow velocity.This paper is concerned with exploring the dynamical stability of a cantilevered fluid-conveying pipe with an additional linear dynamic vibration absorber (DVA) attachment.

Some results are removed in response to a notice of local law requirement.For more information,please see here.12345NextOverview of Mechanics of Pipes Conveying FluidsPart I

In the first part,different types of modeling,dynamic analysis,and stability regimes of pipes conveying fluid restrained by elastic or inelastic barriers are described.The dynamic and stability behaviors of pinned-pinned,clamped-clamped,and cantilevered pipes conveying fluid together with curved and articulated pipes will be discussed.Stability Analysis of Maxwell Viscoelastic Pipes Conveying On the basis of some studies of elastic pipe conveying fluid,the dynamic behavior and stability of Maxwell viscoelastic pipes conveying fluid with both ends simply supported,which are gyroscopic conservative system,were investigated by using the finite difference method and the corresponding recurrence formula.The effect of relaxation time of viscoelastic materials on the variation curve

Stability analysis of viscoelastic curved pipes conveying

Based on the Hamilton's principle for elastic systems of changing mass,a differential equation of motion for viscoelastic curved pipes conveying fluid was derived using variational method,and the complex characteristic equation for the viscoelastic circular pipe conveying fluid was obtained by normalized power series method.The effects of dimensionless delay time on the variation Stability of Cracked Fluid-Conveying Pipeline on Elastic The effects of crack location and elastic foundation stiffness to the form of instability of the pipes under the distributed follower force are analyzed.Results show that the elastic foundation stiffness can enforce the stability of the pipes effectively,and the effects are more obvious when the crack location is closer to the middle of the pipe.

The stability of an infinite elastic pipe with uniform

A pipe conveying incompressible fluid is modeled using linear beam theory.The stability of the system is analyzed using a causal approach which can distinguish between absolute and convective instabilities.Closed-form expressions for the stability boundaries of the beam theory model are derived analytically.The dissipation-free pipe is absolutely unstable if the ratio of the mass per unit Vibration analysis of a viscous-fluid-conveying single Using the model of macro pipeline,Yoon et al.[9] studied the influence of flow velocity on the fluid-conveying carbon nanotubes.Lee and Chang [10] assumed the carbon nanotube embedded into elastic medium,and found the nonlocal effect,viscosity effect and elastic medium constant would affect the natural frequencies of carbon nanotube.Wang [11] investigated the effects of small length scale

Vibration and dynamic stability of pipes conveying fluid

The paper deals with the vibration and dynamic stability of cantilevered pipes conveying fluid on elastic foundations.The relationship between the eigenvalue branches and corresponding unstable [1708.01943] Stability of helical tubes conveying fluidAug 06,2017·We study the linear stability of elastic collapsible tubes conveying fluid,when the equilibrium configuration of the tube is helical.A particular case of such tubes,commonly encountered in applications,is represented by quarter- or semi-circular tubular joints used at pipe's turning points.The stability theory for pipes with non-straight equilibrium configurations,especially for

[1708.01943] Stability of helical tubes conveying fluid

Aug 06,2017·We study the linear stability of elastic collapsible tubes conveying fluid,when the equilibrium configuration of the tube is helical.A particular case of such tubes,commonly encountered in applications,is represented by quarter- or semi-circular tubular joints used at pipe's turning points.The stability theory for pipes with non-straight equilibrium configurations,especially for



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