Friction-induced limit cycling in flexible rotor systems: An experimental drill-string set-up

Mihajlović, Nenad; Wouw, van de N Nathan; Hendriks, Mpm Maarten; Nijmeijer, H.

doi:10.1007/s11071-006-9042-z

Cited by 67 publications

(52 citation statements)

References 26 publications

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“…Such vibrations are analyzed in more details in [24] when the lower disc is fixed in Hereto, we add additional mass m at a distance of d = 0.1 m from the centre of the lower disc in the direction of the already existing unbalance. Consequently, the parameters e, m r and J C of the estimated model (see Table 1) are changed and the new related parameters e , m r and J C are as follows:…”

Section: Friction-induced Vibrationsmentioning

confidence: 99%

“…Krauter [13] analyzed torsional vibrations in water lubricated bearings and authors in [2,3,16,21,24,25] analyzed torsional vibrations in drill-string systems. In those papers, it is concluded that torsional vibrations are caused by negative damping in the friction force in the bearings [13], the friction force at the contact between the bit and the borehole rotor [2,3,16,21] and by the friction force at the rotor [24,25].…”

Section: Introductionmentioning

confidence: 99%

“…In those papers, it is concluded that torsional vibrations are caused by negative damping in the friction force in the bearings [13], the friction force at the contact between the bit and the borehole rotor [2,3,16,21] and by the friction force at the rotor [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Interaction between torsional and lateral vibrations in flexible rotor systems with discontinuous friction

et al. 2007

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In this paper, we analyze the interaction between friction-induced vibrations and self-sustained lateral vibrations caused by a mass-unbalance in an experimental rotor dynamic setup. This study is performed on the level of both numerical and experimental bifurcation analyses. Numerical analyses show that two types of torsional vibrations can appear: frictioninduced torsional vibrations and torsional vibrations due to the coupling between torsional and lateral dynamics in the system. Moreover, both the numerical and experimental results show that a higher level of mass-unbalance, which generally increases the lateral vibrations, can have a stabilizing effect on the torsional dynamics, i.e. friction-induced limit cycling can disappear. Both types of analysis provide insight in the fundamental mechanisms causing self-sustained oscillations in rotor systems with flexibility, mass-unbalance and discontinuous friction which support the design of such flexible rotor systems.

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Section: Friction-induced Vibrationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interaction between torsional and lateral vibrations in flexible rotor systems with discontinuous friction

et al. 2007

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“…Preliminary studies have been conducted in the past, such as in Melakhessou et al [16], who carried out an experimental investigation focusing on the local contact between the drill-strings and the well. Mihajlovic et al [17] used an experimental setup including upper and lower disks to study the friction-induced limit cycles in drill-string systems. A laboratory investigation of drill-string vibrations was carried out by Khulief and AI-Sulaiman [18] by using a magnetic tension brake to simulate stick-slip oscillations.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental studies of stick–slip oscillations in drill-strings

Liu

Chávez

et al. 2017

Nonlinear Dyn

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The cyclic nature of the stick-slip phenomenon may cause catastrophic failures in drillstrings or at the very least could lead to the wear of expensive equipment. Therefore, it is important to study the drilling parameters which can lead to stickslip, in order to develop appropriate control methods for suppression. This paper studies the stick-slip oscillations encountered in drill-strings from both numerical and experimental points of view. The numerical part is carried out based on path-following methods for nonsmooth dynamical systems, with a special focus on the multistability in drill-strings. Our analysis shows that, under a certain parameter window, the multistability can be used to steer the response of the drill-strings from a sticking equilibrium or stick-slip oscillation to an equilibrium with constant drill-bit rotation. In addition, a small-scale downhole drilling rig was implemented to conduct a parametric study of the stick-slip phenomenon. The parametric study involves the use of two flexible shafts with varying mechanical properties to observe the effects that would have on stick-slip during operation. Our experimental results demonstrate that varying some of the mechanical properties of the drill-string could in fact control the nature of stick-slip oscillations.

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“…Extensive research has been performed with respect to the experimental rotor dynamic set-up under study. The modeling, parameter estimation and analysis of the dynamic behaviour of the setup are discussed in (Mihajlović et al, 2004;Mihajlović et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Experimental results on output-feedback control of a nonsmooth rotor dynamic system

Bruin

Doris

Wouw

et al. 2007

IFAC Proceedings Volumes

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An experimental implementation of an output-feedback controller on a rotor dynamic system with set-valued friction is presented. The system exhibits coexisting stable/unstable equilibria and undesired friction-induced limit cycles. In the system, the friction and actuation are non-collocated, which prevents the application of standard friction compensation techniques. Therefore, an outputfeedback control strategy is proposed that eliminates the friction-induced limit cycling, stabilizes the desired equilibrium and is robust for uncertainties in the friction model. The effectiveness of the proposed control strategy is shown both in simulations and experiments.

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Friction-induced limit cycling in flexible rotor systems: An experimental drill-string set-up

Cited by 67 publications

References 26 publications

Interaction between torsional and lateral vibrations in flexible rotor systems with discontinuous friction

Interaction between torsional and lateral vibrations in flexible rotor systems with discontinuous friction

Numerical and experimental studies of stick–slip oscillations in drill-strings

Experimental results on output-feedback control of a nonsmooth rotor dynamic system

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