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Title
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A modified non-linear model for high mass ratio square cylinder.
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Sub-Title |
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Subject |
Square cylinde, RMS amplitude, Van der Pol model, Vortex induced vibrations (VIV)
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Sub-Subject |
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Author |
Nadeem Ahmed SHEIKH, Shehryar Manzoor, Shahab Khus
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Publish Year |
2014 |
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Diss#. |
http://dx.doi.org/10.1007%2Fs12206-014-1120-4 |
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Pages |
4989~4996 |
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Text Language |
English |
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Accession |
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Library Section |
Research Article |
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Abstract |
An improved analytical method for the modelling of vortex induced vibrations (VIV) of a square section cylinder is reported. The method is based on a typical structural oscillator coupled to a non-linear wake (Van der Pol) oscillator. Improvements are introduced to the pre-existing analytical methods sorted out from the literature. Dissipation term in the structural oscillator model is modified by the addition of a non-linear damping term. Definition of the wake oscillator is updated simultaneously to include stream-wise force component exerted on the structure. Results show that our modified analytical method correctly predicts the location of peak lock-in amplitude on the amplitude vs reduced-velocity map as observed in recent experiments. The range of lock-in is also reasonably well predicted. The modified method shows that the influence of non-linear structural damping and stream-wise force components cannot be neglected while modelling high mass ratio systems.
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