when we find the natural frequency for any catenary structures (steel catenary riser) by considering it as the tensioned beam, do we get the correct natural frequency?
while going through one of the research papers,
i am getting difference in the natural frequency, the paper has considered the catenary structure as tensioned beam where as i am considering the catenary as it is.
also the program used by the paper(mentioned above) is different.
please help me in identifying this problem
thank you
Sorry but this question is too vague!
Could you give the reference to the paper? Could you provide a table with numerical differences obtained? Otherwise you can obtain no meaningful answer.
BW
The natural frequency of a tensioned or not tensioned beam is different (see for example the guitar chords. In the case of catenary the effect of gravity produces a tension that MUST be taken into account. The gravity itself (as a distributed load along the beam) is not influent for fibration analysis since it is a constant load.
Hi...
Try this article:
Nilson Barbieri, Oswaldo Honorato de Souza Junior, Renato Barbieri "Dynamical analysis of transmission line cables. Part 1—linear theory" Mechanical Systems and Signal Processing 18 (2004) 659–669
There isn't gravity effects... but this article was me very useful to start a numerical modeling by Cubical Lagrangean FE.
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