Natural frequencies and mode shapes of statically deformed inclined risers

Type
Conference Paper

Authors
Alfosail, Feras
Nayfeh, Ali H.
Younis, Mohammad I.

KAUST Department
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division

Online Publication Date
2017-02-08

Print Publication Date
2016-11-11

Date
2017-02-08

Abstract
In this work, we investigate numerically the linear vibrations of inclined risers using the Galerkin approach. The riser is modeled as an Euler-Bernoulli beam accounting for the nonlinear mid-plane stretching and self-weight. After solving for the initial deflection of the riser due to self-weight, a Galerkin expansion of fifteen axially loaded beam mode shapes are used to solve the eigenvalue problem of the riser around the static equilibrium configuration. This yields the riser natural frequencies and exact mode shapes for various values of inclination angles and applied tension. The obtained results are validated against a boundary-layer analytical solution and are found in good agreement. This constructs a basis to study the nonlinear forced vibrations of inclined risers.

Citation
Alfosail, F. K., Nayfeh, A. H., & Younis, M. I. (2016). Natural Frequencies and Mode Shapes of Statically Deformed Inclined Risers. Volume 4A: Dynamics, Vibration, and Control. doi:10.1115/imece2016-66009

Acknowledgements
This research made use of the resources of IT Research Computing at King Abdullah University of Science & Technology (KAUST) in Thuwal, Saudi Arabia. In addition, the first author acknowledges the support of Saudi Aramco.

Publisher
ASME International

Conference/Event Name
ASME 2016 International Mechanical Engineering Congress and Exposition, IMECE 2016

DOI
10.1115/IMECE2016-66009
10.1115/IMECE201666009

Additional Links
https://asmedigitalcollection.asme.org/IMECE/proceedings/IMECE2016/50541/262056

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