Abstract
The present experimental study investigates the dynamics and stability of soft cantilevered circular cylindrical shells of various length-to-radius (L/R) ratios subjected to subsonic internal airflow. The results indicate that the system loses stability by flutter through a strongly subcritical bifurcation. Longer shells lose stability at lower flow velocities and the oscillations become more irregular as the flow velocity is increased beyond the critical value, suggesting the presence of a chaotic component in the oscillations. The chaotic component is shown to be dependent on the L/R. The results also show that for high enough flow velocities, flutter can no longer be excited. Finally, the effect of the outflow jet on the stability of the system is examined by mounting a flat horizontal plate at different distances over the free end of the shell. It is found that changing the outflow jet direction from axial to radial not only has a stabilizing effect, but also weakens the chaotic behaviour of the oscillations.
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Acknowledgements
Thanks go to Prof. Jovan Nedić of McGill University for lending us the high-speed camera. The authors are also grateful to Dr. Giovanni Ferrari for helping with conducting experimental modal analysis.
Funding
The authors gratefully acknowledge the financial support by the Natural Sciences and Engineering Research Council of Canada (NSERC) for CRDPJ 530933–18 grant and Pipeline Research Council International, Canada (PRCI).
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IG contributed to data curation, formal analysis, investigation, methodology, software, visualization, and writing—original draft. MA contributed to conceptualization, funding acquisition, methodology, project administration, supervision, and writing—review and editing. MPP contributed to conceptualization, funding acquisition, methodology, project administration, supervision, and writing—review and editing.
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Appendix
Appendix
Appendix: Detailed results on the unstable oscillations at V > Vrest, i
In this appendix, an extensive analysis of the oscillations at \(V>{V}_{rest,i}\) is presented in Figs. 14 and 15. For this purpose, two data points of the same shell (the same L/R ratio), but different flow velocities (one equal to and the other greater than \({V}_{rest,i}\)), are selected, as listed in Table
5.
Note that in Fig. 20a,
two lasers are employed to measure the velocity of the shell at two target points; the ‘lower’ and the ‘upper’ measurement points located at \(\frac{1}{5}\) L and \(\frac{1}{3}\) L from the bottom of the shell, respectively (L being the length of the shells). However, the signal from the upper measurement point is used to obtain all the experimental results other than Fig. 20a. As discussed in Sect. 2, the amplitude of oscillations at \(V>{V}_{rest,i}\) undergoes frequent sudden reductions which make the oscillations look like intermittent bursts of oscillations, eventually leading to restabilization of the shell. This behaviour is clearly observed in the time history of oscillations at \(V>{V}_{rest,i}\) in Fig. 20a.
According to Figs. 20 and 21 , for point D, (1) the PSD consists of wide cone-like peaks, (2) the phase portrait displays orbits which tend to fill the phase plane,
(3) the pseudo-phase space reconstruction shows a scattered cloud of points, (4) the PDF exhibits a Gaussian distribution, and (5) the autocorrelation dies out rapidly with time.
On the other hand, for point C, (1) the PSD contains relatively sharper spikes, (2) the phase portrait consists of relatively cleaner overlapping orbits, (3) the pseudo-phase space reconstruction tends to form a closed curve, (4) the PDF shows relatively less deviation from the double-masted shape towards Gaussian distribution, and (5) the autocorrelation demonstrates a statistical similarity between delayed versions of oscillations.
In conclusion, the oscillations associated with point C display a weaker chaotic behaviour. This is in agreement with the results of the largest Lyapunov exponent in Fig. 16c, that at point D, \({\lambda }_{1}\) is almost twice as large as for point C, implying less predictability of motions at point D.
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Gholami, I., Amabili, M. & Païdoussis, M.P. Experiments on the dynamics and stability of cantilevered circular cylindrical shells conveying airflow. Nonlinear Dyn 111, 7005–7026 (2023). https://doi.org/10.1007/s11071-023-08245-9
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DOI: https://doi.org/10.1007/s11071-023-08245-9