A Universal Reduced Damping Parameter for Prediction of Vortex-Induced Vibration

2002 ◽  
Author(s):  
J. Kim Vandiver
Keyword(s):  
Flow Velocity ◽  
Dimensionless Parameter ◽  
Vibration Response ◽  
Vortex Induced Vibration ◽  
Response Data ◽  
Damping Parameter ◽  
Historical Relationship ◽  
Relationship Of ◽  
Clear Presentation

A dimensionless parameter, Su, is proposed which enables a clear presentation of vortex-induced vibration response data in sheared and uniform flows. The ability of the parameter to account for the effects of damping, flow velocity and power-in length is demonstrated with response data from an unusual set of experiments conducted by SHELL Development Co. The historical relationship of the new parameter to the earlier work of Owen Griffin is also presented.

Innovative Experimental Investigation on the Influences of the Reynolds Number

2017 ◽  
Author(s):  
Jian Gu ◽  
Antonio Carlos Fernandes
Keyword(s):  
Experimental Investigation ◽  
Reynolds Number ◽  
Dimensionless Parameter ◽  
Individual Effect ◽  
Vortex Induced Vibration ◽  
Industry Standards ◽  
Experimental Facilities ◽  
The Individual

The influences of Re (Reynolds number) on the response of vortex induced vibration (VIV) have been studied by previous researches, which indicate the influences should not be ignored. However, due to the limitation of experimental facilities and complexity of the cases, the explicit influence of Re on VIV is still not fully known. Meanwhile, the industry standards also do not supply design reference taking account of Re effects quantitatively. In present work, an innovative dimensionless parameter (denoted as “inertia-viscosity”) is proposed to displace the Re in the dimensionless system, in order to clarify the individual effect of Re. With this method, comparing tests are concisely carried out, and the effectiveness and feasibility are demonstrated. Through the comparing of tests, several remarkable results are obtained.

Effect of Blockage Size on Pipe Vibration

2012 ◽  
Vol 626 ◽  
pp. 993-996
Author(s):  
N. Liyana Tajul Lile ◽  
M.J. Hasnul ◽  
R.A. Siregar ◽  
J.C. Leong
Keyword(s):  
Flow Velocity ◽  
Turbulence Intensity ◽  
Vibration Analysis ◽  
Vibration Response ◽  
Circular Pipe ◽  
Flow Area ◽  
Circular Pipes ◽  
External Objects ◽  
Vibration Parameters ◽  
Pipe Vibration

Circular pipes are widely used to convey goods to a desired location. Flow inside a pipe needs to be smoothed and unobstructed to ensure an optimize flow of particle. However, pipes are prone to clogging or blocking due to deposition of unwanted impurities and external objects. Built up inside a circular pipe will affect the flow velocity and pressure within the pipe. This paper presents a method of assessing blockage inside a pipe by using vibration analysis. The effect of blockage was observed through changes in pipe vibration response and also turbulence intensity. The changes in vibration parameters were identified together with the reduction of flow area due to increasing blockage size.

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