Journal of Applied Nonlinear Dynamics
Hidden Oscillations in Drilling Systems: Torsional Vibrations
Journal of Applied Nonlinear Dynamics 2(1) (2012) 83--94 | DOI:10.5890/JAND.2012.09.006
G.A. Leonov; M.A. Kiseleva; N.V. Kuznetsov; P. Neittaanmäki
Department of Applied Cybernetics, Saint-Petersburg State University, Universitetsky pr. 28, Saint-Petersburg, Russia, 198504
Department of Mathematical Information Technology, University of Jyväskylä, P.O. Box 35 (Agora), Jyväskylä, Finland, FI-40014
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Abstract
Study of drilling systems plays important role in drilling industry. During the operation mode these systems experience different kinds of vibration, which may cause malfunctioning (i.e. dissipation of kinetic energy, noise, excessive wear, machine parts premature failure etc). In this article the most common type of vibrations is considered - torsional vibrations. The two mass model of a drilling system and modified version of it, supplemented by equations of induction motor, are studied. Both systems experience so-called hidden oscillations. It is extremely difficult to analyze such hidden oscillations since they cannot be found with the help of standard analytical procedures of trajectory modeling in the equilibrium state domain. Hidden oscillations correspond to torsional vibrations in real systems, thus they may cause breakdowns.
Acknowledgments
This work was partly supported by the Government of the Russian Federation (Ministry of Education and Science of the Russian Federation), Russian Foundation for Basic Research, Saint-Petersburg State University, Academy of Finland and Finnish Doctoral Programme in Computational Science.
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