Flow Induced Vibration Of Circular And Square Cylinder With Low Mass And Damping
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Flow Induced Vibration Of Circular And Square Cylinder With Low Mass And Damping
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Author : Jisheng Zhao
language : en
Publisher:
Release Date : 2012
Flow Induced Vibration Of Circular And Square Cylinder With Low Mass And Damping written by Jisheng Zhao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
This thesis investigates cross-flow flow-induced vibration of elastically mounted rigid circular and square cylinders with low mass and damping ratio over a range of low and vibration parameters. In particular, two typical body oscillator phenomena of flow-induced vibration, vortex-induced vibration and galloping, are studied experimentally. Thus, the study consists of two main parts. The first part, using simultaneous displacement, force and vorticity measurements, investigates the dynamic response of a circular cylinder undergoing transverse free vortex-induced vibrations and controlled trajectory-following vibrations. The second part characterises the amplitude and frequency responses of a square cylinder with angle of attack variation. Despite extensive work has been undertaken to understand the fundamental characteristics of free and forced vibrations of a circular cylinder, there are still a number of unresolved questions in the literature concerning the similarities and differences between the free and forced vibration cases. In order to directly compare these two vibration cases, a low-friction air-bearing rig and a real-time feedback control system were therefore designed and implemented in experiments. The major results obtained show that the transverse lift force and the decomposed vortex force experienced by a cylinder forced to follow the trajectory of free VIV are identical to the free vibration case, when both the total phase and the vortex phase relative to the body motion are constantly stable. However, significant differences between the two vibration cases are found at a reduced velocity located in the middle upper branch of VIV where largest-scale body vibration occur with complex switching phenomena in the total phase and the vortex phase. The results from the second part, flow-induced vibration of a square cylinder with angle of attack variation, show that the cylinder, as expected, experiences galloping at the zero angle of attack orientation (0 degree) and vortex-induced vibration at the diamond orientation (45 degree). As the angle of attack is varied from 45 degree to 0 degree, the body can undergo combinations of both vortex-induced vibration and galloping in a mixed response region. In this region, the oscillation amplitude response exhibits a new branch that exceeds the responses resulting from the two body-oscillator phenomena independently. For velocities above this resonant region, the body oscillation frequency splits into two diverging branches. Further, analysis of the amplitude reveals that the transition between galloping and vortex-induced vibrations occurs over a narrow range of angle of incidence. Despite the rich set of states found in the parameter space the vortex shedding modes remain very similar to those found previously in vortex-induced vibration.
Flow Induced Vibration Of Circular Cylindrical Structures
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Author : Shoei-Sheng Chen
language : en
Publisher: Springer
Release Date : 1987-07-21
Flow Induced Vibration Of Circular Cylindrical Structures written by Shoei-Sheng Chen and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987-07-21 with Mathematics categories.
This book presents the vibration of circular cylinders in quiescent fluid, axial flow, and crossflow, and applications of the analytical methods and experimental data in design evaluation of various system components consisting of circular cylinders. It emphasizes analytical tools to predict structural vibration and experimental data for fluid forces and will help solve many important flow induced vibration problems in different industries. The techniques and results presented in this book will be useful not only to designers but also to researchers in this field. A comprehensive treatment of different situations is given in this book. For example, a thorough review of the analytical models and most recent development of fluidelastic instability of an array of cylinders in crossflow are presented in Chapter 10.
Flow Induced Vibration
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Author : Robert D. Blevins
language : en
Publisher:
Release Date : 1977
Flow Induced Vibration written by Robert D. Blevins and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Science categories.
A Critical Review Of The Intrinsic Nature Of Vortex Induced Vibrations
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Author : Turgut Sarpkaya
language : en
Publisher:
Release Date : 2003
A Critical Review Of The Intrinsic Nature Of Vortex Induced Vibrations written by Turgut Sarpkaya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Vibration categories.
This is a concise and comprehensive review of the progress made during the past two decades on vortex induced vibration (VIV) of mostly circular cylindrical structures subjected to steady uniform flow. The critical elements of the evolution of the ideas, theoretical insights, experimental methods, and numerical models are traced systematically; the strengths and weaknesses of the current state of the understanding of the complex fluid/structure interaction are discussed in some detail. Finally, some suggestions are made for further research on VIV. The organization of the paper is given at the end of the next section.
Flow Induced Vibrations Of In Line Cylinder Arrangements At Low Reynolds Numbers
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Author : Kintak Raymond Yu
language : en
Publisher:
Release Date : 2014
Flow Induced Vibrations Of In Line Cylinder Arrangements At Low Reynolds Numbers written by Kintak Raymond Yu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Vortex Induced Vibration On A Two Dimensional Circular Cylinder With Low Reynolds Number And Low Mass Damping Parameter
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Author :
language : en
Publisher:
Release Date : 2015
Vortex Induced Vibration On A Two Dimensional Circular Cylinder With Low Reynolds Number And Low Mass Damping Parameter written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Vortex Induced Vibration Attenuation Of Circular Cylinders With Low Mass And Damping
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Author : Mas̆a Branković
language : en
Publisher:
Release Date : 2004
Vortex Induced Vibration Attenuation Of Circular Cylinders With Low Mass And Damping written by Mas̆a Branković and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Artificial islands categories.
Vortex Induced Vibration Attenuation Of Circular Cylinders With Low Mass And Damping
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Author :
language : en
Publisher:
Release Date : 2004
Vortex Induced Vibration Attenuation Of Circular Cylinders With Low Mass And Damping written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Hydrodynamics Around Cylindrical Structures
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Author : Jorgen Fredsoe
language : en
Publisher: World Scientific
Release Date : 1997-03-17
Hydrodynamics Around Cylindrical Structures written by Jorgen Fredsoe and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-03-17 with categories.
This book discusses the subject of wave/current flow around a cylinder, the forces induced on the cylinder by the flow, and the vibration pattern of slender structures in a marine environment.The primary aim of the book is to describe the flow pattern and the resulting load which develops when waves or current meet a cylinder. Attention is paid to the special case of a circular cylinder. The development in the forces is related to the various flow patterns and is discussed in detail. Regular as well as irregular waves are considered, and special cases like wall proximities (pipelines) are also investigated.The book is intended for MSc students with some experience in basic fluid mechanics and for PhD students.
Fluid Structure Interactions
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Author : Michael P. Païdoussis
language : en
Publisher: Cambridge University Press
Release Date : 2014-01-02
Fluid Structure Interactions written by Michael P. Païdoussis and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-01-02 with Technology & Engineering categories.
Structures in contact with fluid flow, whether natural or man-made, are inevitably subject to flow-induced forces and flow-induced vibration: from plant leaves to traffic signs and to more substantial structures, such as bridge decks and heat exchanger tubes. Under certain conditions the vibration may be self-excited, and it is usually referred to as an instability. These instabilities and, more specifically, the conditions under which they arise are of great importance to designers and operators of the systems concerned because of the significant potential to cause damage in the short term. Such flow-induced instabilities are the subject of this book. In particular, the flow-induced instabilities treated in this book are associated with cross-flow, that is, flow normal to the long axis of the structure. The book treats a specific set of problems that are fundamentally and technologically important: galloping, vortex-shedding oscillations under lock-in conditions, and rain-and-wind-induced vibrations, among others. The emphasis throughout is on providing a physical description of the phenomena that is as clear and up-to-date as possible.