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MECSOL 2022
8th International Symposium on Solid Mechanics
STABILITY AND DYNAMIC BEHAVIOR OF A CANTILEVERED VISCOELASTIC PIPE ASPIRATING INTERNAL FLUID
Submission Author:
jorge david joaquin apaza , SP
Co-Authors:
jorge david joaquin apaza, Lenin Valdivia, Juan Pablo Julca Avila
Presenter: jorge david joaquin apaza
doi://10.26678/ABCM.MECSOL2022.MSL22-0172
Abstract
The present study, analyzes the stability and dynamic behavior of a cantilevered viscoelastic pipe disposed vertically and aspirating internal fluid. The structural model is based on the Euler-Bernoulli beam theory, the internal flow is of the type plug-flow. The dynamic equation is derived by Newtonian method, it was observed that the Coriolis force for aspirating is unstable, different from the case of discharge that behaves as a stabilizer, this generated an increase in the start of instability. The force acting on the free end of the pipe due to depressurization of the fluid being aspirated is considered, which is transmitted axially along the pipe. The differential govern equation of the system was discretized by the Galerkin method. The natural frequencies have been calculated for different internal flow velocity and the results obtained are presented in the Argand diagram where it is possible to identify the critical flow velocity. The system loss stability due first-mode due to unique type via Hopf bifurcation by flutter at small velocity flow values. The numerical analysis of the system to calculate the stable-state response, is carried, the system is exited harmonic force in the time domain. The dynamic response of the system is obtained out through the Laplace transformation method. to its boundary conditions, the force acting on the free end caused by the aspirating, has a great effect on the deformation of the pipe. In general, the results show a loss by first-mode stability due to flutter, which are consistent with the results available in the literature, observing a good coherence of the results.
Keywords
Galerkin method, Flutter, stability, dynamic stability
