[Home ] [Archive]    
:: Main :: About :: Current Issue :: Archive :: Search :: Submit :: Contact ::
:: Volume 3, Issue 8 (Summer 2012 2012) ::
JPG 2012, 3(8): 25-34 Back to browse issues page
Determining Natural Frequency of Free Spanning Offshore Pipelines by Considering the Seabed Soil Characteristics
Mehdi Yaghoobi , Said Mazaheri , Ebrahim Jabbari
Iranian National Institute for Oceanography
Abstract:   (8982 Views)

Free spans or suspended spans normally occur in subsea pipelines due to the irregularity of seabed and by

scouring phenomena around the installed non-buried pipeline. The hydrodynamic around the pipeline can

lead to a vibration of the pipeline.This kind of vibration may cause fatigue damage to the pipeline. In order

to study the hydrodynamic around the pipeline, calculating the natural frequency of the marine pipeline in

free spans accurately is very important. Resonance phenomenon may occur when the frequency of the

hydrodynamic forces induced by a vortex shedding approach the natural frequency of pipelines. A

resonating span can experience significant deflections and associated stresses. Several parameters such as

pipeline profile, axial forces, seabed soil and boundary conditions influence the natural frequency of the

pipeline. The soil characteristic is an important factor which should be considered in determining the

natural frequency of pipeline in free span. In this paper, attempts have been made to investigate the natural

frequency of free spanning pipelines and influence of soil characteristic in support of pipeline in free span.

In this regard, various boundary conditions were considered and the results were analyzed.

Keywords: Offshore pipeline, Free span, Natural frequency, Finite element method
Full-Text [PDF 643 kb]   (4303 Downloads)    
Type of Study: Basic and Original Research | Subject: Coastal Engineering
Received: 2012/09/29 | Accepted: 2013/07/23 | Published: 2013/07/23
Send email to the article author

Add your comments about this article
Your username or Email:

Write the security code in the box >


XML     Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Yaghoobi M, Mazaheri S, Jabbari E. Determining Natural Frequency of Free Spanning Offshore Pipelines by Considering the Seabed Soil Characteristics. JPG. 2012; 3 (8) :25-34
URL: http://jpg.inio.ac.ir/article-1-75-en.html


Volume 3, Issue 8 (Summer 2012 2012) Back to browse issues page
نشریه علمی پژوهشی خلیج فارس Journal of the Persian Gulf
Persian site map - English site map - Created in 0.08 seconds with 31 queries by YEKTAWEB 3647