You can start by reading the two articles below,

Best regards

http://www.jadelltd.com/wa_files/Displacement_20Method_20for_20Determining_20Acceptable_20Piping_20Vibration_20Amplitudes.pdf

http://turbolab.tamu.edu/proc/turboproc/T19/T19119-134.pdf

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Dear Mohammad Mahrous.

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In analyzing the stability of pipelines there are two things to consider, the natural frequencies of these hydraulic structures and the excitation frequency that induces the flow. Elnesr indicated two articles that analyze correctly the first point, but I think you're also concerned by the induced frequencies. Reference in "Piping Vibration Analysis" "Table 2-Piping Vibration Excitation souces", there is a partial description of excitations frequencies, however there is a great simplification as the excitation frequencies. Just to give an example, in the case of the generation mechanism - Pressure Surge / Hydraulic Hammer instabilities caused no trapped air are cited.

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Honestly I think you'll have a job that overcomes a master's thesis, I would suggest a restriction on the object of the thesis, as it is very wide and there are no references covering all areas

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Thank you everybody ,sorry i didn't sea your replay i will review it and give you a feedback

Dear Rogerio Maestri

I need to understand what you mean by " a restriction on the object of the thesis, " ,whatever i may work on Natural Gas Process Piping system ,Is that what you mean????

No.

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I just think it will be a lot of work.

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I just thought the object of very extensive.

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But the thesis focus on a case study, is perfect.

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However have i a hope to carry out this thesis?

There are some keypoint to start working. The vibration of pipes is related with fluid speed and pipe stifness. Is very interesting the study of the layout, ie: support locations and support properties. That is if the support are rigid or not (snnuber). The other way is to study the fluid speed and inner structure ie: turbulence. This study is connected with tha layout again. Typically the pipe vibration is solved decrasing the speed, or increasing the pipe diameter, or relocating support. Good luck.

One more thing, there´s a lot of work to be done in the fluid induced vibration, or in the bistable flow condictions, or in the turbulence transición (not between laminar or turbulen) that is between different turbulents patterns

The object which i'm thinking about is to ellimenate or decrease vibration ,for example :decreasing friction by adding smooth lining to pipe internal wall ,ad devices in piping system to decrease turbulence ,

thank you for your support

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Dear Mohammad Mahrous.

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Forget the viscous friction as a mechanism induced vibration, if you want to know why I can make a brief explanation. I've worked with this subject some twenty years ago.

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ok Rogerio thanks ,

just send me your explane i need to know more about this

Dear Mohammad Mahrous.

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If you look some of my contributions you will see that there are two entries:

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Unsteady Turbulent Flows in Channels with Parallel or Diverging Walls. (1991)

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Wall shear stress modulation in a turbulent flow Subjected to imposed unsteadiness with adverse pressure gradient. (2010).

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The first refers to an initial report of all research group (Binder, Tardu, Blackwelder, Feng and Maestri) who worked in the 90s on the subject of Pressure Fluctuation Interaction between oscillatory flow and turbulence flow (simplified explanation) , and the second in which TARDU made a summary of what was running at the time plus the experience he has accumulated from 1991 to 2009 on Adverse Pressure Gradient.

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In 1991, after finishing my period of stay in Grenoble (France) returned to other activities in Brazil. After my departure from the group, several other studies have been published by Sedat TARDU you can look at Reseach Gate.

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There are two possible conclusions and described in the texts:

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(1991)“It has been confirmed that the time-mean statistical characteristics of channel flow (between parallel walls unless otherwise specified) are essentially not affected by the imposed oscillations even when these have amplitudes of 64%”.

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(2010)“ The imposed unsteadiness affects the time mean flow under the effect of the adverse pressure gradient (APG), in contrast to the canonical unsteady turbulent wall layers……….Some of these structural modifications are explained by the effect of the eddy viscosity that plays a key role in the vorticity diffusion process as the APG increases.”,

In the case of Adverse Pressure Gradient (APG) had a modulation of the mean flow and turbulence of the same. At the time it was more or less clear that this modulation was due more to the redistribution of the mean flow than direct interactions between the turbulence near the wall and the oscillations of the CPA.

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For reasons of contract, I need to return to my place and willingness of the team coordinator. We can not continue to show clearly what the real mechanism. This occurred independent of my will and Tardu, but even in the abstracts of two articles this point is set:

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On the other hand when adverse pressure gradient (APG) there occur influence of fluctuations and turbulence that are expressed in the (2010) article and are explained in the article, i.e. other mechanisms that had to be explained properly needed more testing and complementary equipment, which was not realized due to problems that escaped technical reasons.

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Soon I can say clearly confirmed by assays, except singularities, fluctuations in the flow will not change in the average wall tension, and that these averages to have a modulation with the turbulence fluctuations should have at least the same order of frequency greatness.

In your case, the effect would be the opposite, knowing the degree of turbulence of the flow check whether they want to impose loads on the structure. Using the findings of the studies conducted, it can be concluded that the frequency characteristics of turbulence that are decades above the possible frequencies of the structure are fully decoupled, does not generate harmonic or sub-harmonic compatible between turbulence and structure.

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