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DINAME2019
DINAME2019
Numerical analyses of two articulated rigid pipes ejecting fluid and subjected to support excitation
Submission Author:
Igor Lourenço , SP
Co-Authors:
Igor Lourenço, Guilherme Franzini
Presenter: Igor Lourenço
doi://10.26678/ABCM.DINAME2019.DIN2019-0051
Abstract
This paper deals with the parametric instability analysis of two articulated rigid pipes (like a double-pendulum) ejecting fluid. The instability of the trivial solution is investigated using the Floquet Theory. Herein, parametric instability is reached by imposing vertical and harmonic motion to the support of the rigid bars. The linearized equations of motion are derived and curves of instability are obtained for different combinations of parametric excitation amplitude and frequency and for some selected internal flow velocities. Among other findings, this extended abstract reveals that the presence of internal flow significantly affects the regions in the control parameters in which unbounded solutions are obtained.
Keywords
Pipe ejecting fluid, Parametric instability, Floquet Theory, Linear dynamics
