Flow induced vibration pdf merge

Numerical and experimental comparative study on the flow. Flowinduced vibration of circular cylindrical structures iaea. Flowinduced vibration fiv of the piping system is the most common causes of high cycle fatigue. From the standpoint of the designer, a desirable goal was to have available an analytical procedure allowing the prediction of. This study evaluates vortex shedding and potential vibration across dead leg branches. Flowinduced pulsation and vibration in hydroelectric. Flow induced vibrations in pipes, a finite element approach ivan grant abstract flow induced vibrations of pipes with internal uid ow is studied in this work. Flow induced vibration testing of a pwr fuel assembly.

Introduction proven fuel reliability is a major concern to westinghouse ce nuclear power, llc cenp and its pwr fuel customers. The acoustic pressure is usually created from pressurereducing devices due to high pressure drops and mass flows of vapor services. Flow induced vibration during the optic fiber coating process 107 m. Flow induced vibrations fiv is a known problem in nuclear reactors. Pdf the flow induced vibration of pipes due to internal flowing fluid is studied and. Mack mechatronics and intelligence systems, faculty of engineering university oftechnology, sydney, broadway, nsw, 2007 australia abstract this research aims to experimentally investigate the critical flow. The interference is responsible for several changes in the characteristics of. Wind induced vibration and the effects on steel and aluminum light poles provides detailed information about what aeolian vibration is, how it can be identified, how wind induced vibration can affect the performance and strength of light poles, and ways the effects of vibration can be mitigated both pro and retroactively. Vibration is usually divided into two character types. Nonlinear lateral vibration of a vertical fluidconveying pipe with end mass. Introduction flow interference among groups of cylinders has been the subject of many studies in the past. Part of themechanical engineering commons this thesis is brought to you for free and open access by byu scholarsarchive.

Flowinduced vibration, or vortex shedding, is due to high flow velocities such as in a piping dead leg of a centrifugal compressor system. A fairly comprehensive study of cross flow vibrations of a single cylinder in a uniform flow is reported. Flow past a valve entrance cavity excites a standing wave, resulting in noise and vibration. Cfd simulation of flowinduced vibration of an mafiadoc. Department of mechanical engineering, american university of sharjah, sharjah, uae. Flowinduced vibration fiv analysis vortex shedding. In many plants, vibration and noise problems occur due to fluid flow, which can greatly disrupt smooth plant operations. There are a staggering number of different disciplines and approaches to this subject, and from my own perspective this is one of the best guides published. An understanding of fluid mechanics is required to make the most if this guide. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Special attention was paid to the subject of internal twophase fiv generated at industrial piping systems twophase flow regimes. These flow related phenomena are called flow induced vibration.

The worldleading author team doesnt assume prior knowledge of mathematical methods and provides the reader with information on the basics of modeling. Flowinduced vibration, or vortex shedding, is due to high flow velocities and high mass flow rates such as in a piping dead leg of a centrifugal compressor system. These slender structures experience both current flow and topend vessel motions, which give rise to the flow structure relative motion and cause viv. Pdf internal fluid flow induced vibration of pipes researchgate. Such flow induced phenomena is more complex in nature and more difficult to single out than the mechanical causes which are directly related to the operational speed of the pump. The study includes, but not limited to, turbulenceinduced vibration, vorticity sheddinginduced vibration, and the fluid elasticstability. By stressing these basic elements, the authors provide a basis for the transfer of knowledge from one system to another, as well as from one engineering field to another. Flowinduced vibration analysis of supported pipes with a. Flowinduced vibration of cylindrical structures sabine upnere 1,2, normunds jekabsons 2 1riga technical university, latvia. Flow induced vibration with applications to failure analysis pd146 updated november 2010 2 day three heat exchanger tube flowinduced vibration tube and shell heat exchanger design and fluid dynamics fluid forces on clusters of tubes onset of instability and tube wear. Flowinduced vibration in the compressible cavity flow. This title also focuses on acoustic and mechanical vibration of heat exchangers, power lines, and process ducting. The flow has been found to be periodic for vortex induced motion and quasiperiodic for galloping.

Thompson brigham young university provo follow this and additional works at. Flow induced vibration of cylinders is an important phenomenon in engineering flows. Finite element analysis methodology is used to determine the critical uid velocity that induces the threshold of pipe instability. The stability boundary of fluid velocity is expressed in terms of the system parameters, such as, pipe material density and rigidity, and fluid density, etc. The most probable and widely observed mechanism of piping steadystate vibrations is flow induced vibration. Pdf free vibrations of two sidebyside cylinders in a. Therefore, it is especially important to analyze the vibration of the gate combining.

Design and analysis of a dynamic structure for the study of multiphase flow induced vibration hydrodynamic mass phenomena for countergravity twophase cross. Besides, excessive load caused by unfavourable operating condition may increase the probability of failure occurrence. The current research paper deals with the effects of vibration due to internal fluid flow in a pipeline. The study includes, but not limited to, turbulence induced vibration, vorticity shedding induced vibration, and the fluid elasticstability. Twodimensional numerical simulations of the crossflow around circular cylinders in staggered arrangements have been performed. An experimental study of flow induced vibration of elastically restrained pipe conveying fluid conference paper pdf available november 2015 with 1,403 reads how we measure reads.

But because of the way boston and the rest of new england has grown up architecturally, this 70s modern building stands out from the. The flow of a fluid through a pipe can impose pressures on the walls of the pipe causing it to deflect under certain flow conditions. The rods flowinduced vibration consists of a fuzzy period1 motion. Aiv and fiv in pipelines, plants, and facilities ipc201664651. Engineers and project planners struggling with practical problems will find flowinduced pulsation and vibration in hydroelectric machinery to be a comprehensive and convenient reference covering key topics and ideas across a range of relevant disciplines. Pdf an experimental study of flow induced vibration of. Flow induced vibration and energy extraction of an equilateral triangle prism at different system damping ratios jun zhang, fang liu, jijian lian, xiang yan and quanchao ren state key laboratory of hydraulic engineering simulation and safety, tianjin university, tianjin 300072, china. The mechanism of wake induced vibrations wiv of a pair of cylinders in a tandem arrangement is investigated by experiments. Flowinduced vibration article about flowinduced vibration. Although the vibration amplitudes are small, often only a fraction of the tube wall thickness, therandom vibration is remorseless and goes on throughoutthelife of the heat exchanger. Acoustic and flow induced vibration acoustic and vibration technical manager associate member of the institute of acoustics key presenter at the iaia conference 20, south africa course introduction failures of piping systems in the oil, gas and petrochemical industries can lead to damage of assets, personal injury and loss of life. The source of excitation is turbulent buffeting at low flow velocity, while a movement induced excitation component is present at large flow velocities. Pdf mechanisms for flowinduced vibration of interfering bluff.

Guidelines for acoustic induced vibration aiv, flow induced. Fit analysis applies to rotating pumps or compressors to determine if low. Aiv and fiv in pipelines, plants, and facilities chris b. Vortexinduced vibrations and lockin phenomenon of bellows. The worldleading author team doesnt assume prior knowledge of. Flow induced vibration analysis of supported pipes with a crack. Vortexinduced vibration viv is an important source of fatigue damage of offshore oil exploration and production risers. Experimental characterization of flow induced vibration in turbulent pipe flow andrew s. These slender structures experience both current flow and topend vessel motions, which give rise to the flowstructure relative motion and cause viv. From the standpoint of the designer, a desirable goal was to have available an analytical procedure allowing the prediction of critical fluid flow ranges. Flowinduced vibration in heat exchangers sciencedirect. Many studies have attempted to combine mass ratio and damping.

Vibration phenomenon in heat exchangers is of major concern for designers and process engineers since it can lead to the tube damage, tube leakage, baffle damage, tube collision damage, fatigue, creep etc. Experimental characterization of flow induced vibration in. Flowinduced vibration fiv is a multidisciplinary subject involving fluid. Kaneko nonlinear dynamics of clamped cylindrical shells subjected to flow 125 k. It was not until the 60s, when widespread failure of tubes began to occur 16.

Prior to introducing a new or enhanced fuel design, an extensive qualification program was performed using. Free vibrations of two sidebyside cylinders with fixed support no rotation and displacement at both ends placed in a cross flow were experimentally investigated. Find all the books, read about the author, and more. This book explains how and why such vibrations happen and provides hints and tips on how to avoid them in future plant design. A typical wiv response is characterised by a build up of amplitude persisting to high reduced velocities. Design optimization of shell and tube heat exchanger by. The program uses a rigorous structural analysis approach to calculate the tubes natural frequencies for fundamental and higher modes and can properly handle any tube support arrangement. Vortex induced vibration viv is an important source of fatigue damage of offshore oil exploration and production risers. Power reactor field experience with flowinduced vibration.

Essentially, the flowinduced vibration of the plane gate is a. Experimental investigation of flowinduced vibration in a. Flowinduced vibration of two sidebyside square cylinders. As many previous studies were considered laminar flow re flow for which re 4000. Numerical prediction of flow induced vibrations in nuclear. Cai the onset of flow induced oscillations in collapsible tubes 173 cd. In many cases, lighthills theory can, nevertheless, be applied successfully, and it is the most commonlyused model for the study of flowinduced sound and vibration. Flow induced vein wall vibration in an arteriovenous graft 161 s. The interaction between the turbulent flow of the coolants and the fuel rod bundles. Effect of horizontal excitation at the upper end masatsugu yoshizawa, masanobu watanabe, kouji hashimoto, and masaya takayanagi 281 fluid flowinduced vibration of suspended nonlinear cables w. Flow induced vibration fiv of a rigid cylinder on springs immersed in a steady transverse. Flow induced vibration and energy extraction of an.

These acoustic energies excite the pipe wall circumferentially due to. Moretti linear and nonlinear analyses of sheet flutter induced by leakage flow 119 x. Flow induced vibration, or vortex shedding, is due to high flow velocities such as in a piping dead leg of a centrifugal compressor system. Structures in contact with fluid flow, whether natural or manmade, are inevitably subject to flow induced forces and flow induced vibration. Stockmeier, fluid viscosity effects on flowinduced vibrations of tubes in crossflow, proceedings of the institution of mechanical engineers, flow induced vibration, pp.

Xvib performs flowinduced vibration analysis of a single tube in a heat exchanger bundle. Optimal control of flowinduced vibration of pipeline. In milder cases, the problem may be annoying vibration and noise. Cai the onset of flowinduced oscillations in collapsible tubes 173 cd. Whislt not helpful for my immediate problem, this book covers a host of vibration mechanisms and will be of great help in future design work. Flowinduced turbulence fit analysis vortex shedding.

The most probable and widely observed mechanism of piping steadystate vibrations is flowinduced vibration. Flow speed outside wake is much higher than inside vorticity gathers at downcrossing points in upper layer vorticity gathers at upcrossings in lower layer induced velocities due to vortices causes this perturbation to amplify. It overcomes the limitations of massdamping parameters, which. This paper describes an approach for practical evaluation and elimination of steadystate vibration. The rounded cylinders underwent vortex induced vibration alone in the synchronization regime, whereas the motion of the basic square was vortex induced vibration at lower u r and showed galloping at higher side of u r in the laminar flow regime. Flow induced vibration in pumping system is mainly dependent on operating conditions, inlet distortion, cavitation, surge, etc. An elastically mounted smooth circular cylinder can only undergo vortexinduced vibration viv in isolated conditions, but noncircular sections such as squares and triangles. Flowinduced vibrations are presented in terms of their basic elements. Flowinduced vibration of two cylinders in tandem and staggered. These flowrelated phenomena are called flowinduced vibration. Full text of flow induced vibration internet archive. Flow induced vibrations is constructed as an engineering guide primarily based on research sponsored by the volkswagen foundation located in hannover, germany. For instance, the slender bodies of aircraft fuselages, missiles, and rockets, and the main bodies of industrial smokestacks, power transmission cables, telephone wires, oil pipelines, reactor fuel rods, heatexchanger tubes, and offshore structures, as well as.

Flowinduced vibration of lifting or control surfaces in. From these figures, it was found that the flow induced vibration occurs in outofphase mode. Mechanics of flowinduced vibration failures of heat exchangers caused by flowinduced vibration are mainly in terms of the detriments of heat exchanger tubes. Beta machinery analysis a wood group company calgary, alberta, canada abstract acousticinduced vibration aiv and flowinduced vibration fiv are two common phenomena that can lead to vibrationinduced fatigue failures in piping systems. Pd146 flow induced vibration with applications to failure. Focuses on applications for offshore platforms and piping. Trans icheme, vol 80, part a, april 2002 flowinduced vibration in heat exchangers 229 buffetingall heat exchanger tubes are in constant motion due torandom buffeting. Experimental investigation of flowinduced vibration in a parallel plate reactor fuel assembly. The physical mechanisms corresponding to the 3 source types, and examples of when. Figure 5 shows the vibration modes of the bellows structure for three flexible convolutions in fluid. As many previous studies were considered laminar flow re 4000. Pdf numerical analysis of fluid flow induced vibration. Differentiating between acoustic and flowinduced vibration. Section 5 explores results of flowinduced vibration analysis, final investigations and results are presented in section 6 and concluding remark is given in section 7.

Open library is an initiative of the internet archive, a 501c3 nonprofit, building a digital library of internet sites and other cultural artifacts in digital form. Acousticinduced vibration aiv refers to structural vibration excited by intense acoustic pressure in a piping system with vapor flow. Fischer effects of wall stiffness on the linear stability of flow in an elastic channel 167 x. Vibration in heat exchangers is one of the main problems that the industry has faced over last few decades. An engineering guide dover civil and mechanical engineering. A similar tone is produced when air is blown across the mouth of a pop bottle. Flowinduced vibration scruton number abstract a dimensionless damping parameter, cn. Structures in contact with fluid flow, whether natural or manmade, are inevitably subject to flowinduced forces and flowinduced vibration.