Controlling torsional vibrations of drill strings via decomposition of traveling waves

Kreuzer, Edwin; Steidl, Michael

doi:10.1007/s00419-011-0570-8

Cited by 46 publications

(27 citation statements)

References 11 publications

(12 reference statements)

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“…However, the numerical simulations show that the response of the system may still be improved since absorbers are relatively 'robust' to the inaccuracies. This is in agreement with experience from practical implementations, see for instance [26], [12] or [23].…”

Section: Discussion Of Wave Controllerssupporting

confidence: 92%

A travelling wave approach to a multi-agent system with a path-graph topology

Martinec

Herman

Šebek

2017

Systems & Control Letters

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The paper presents a novel approach for the analysis and control of a multi-agent system with non-identical agents and a pathgraph topology. With the help of irrational wave transfer functions, the approach describes the interaction among the agents from the 'local' perspective and identify the travelling waves in the multi-agent system. The local treatment of the multi-agent system is complementary to the traditional 'overall' approach. It is shown that the different dynamics of the agents creates a virtual boundary that causes a partial reflection of the travelling waves. Undesired effects due to the reflection of the waves, such as amplification/attenuation, long transient or string instability, can be compensated by the feedback controllers introduced in this paper. A set of functions in MATLAB, which allows numerical simulation of the proposed approach, have been made available on MATLAB Central.

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Section: Discussion Of Wave Controllerssupporting

confidence: 92%

A travelling wave approach to a multi-agent system with a path-graph topology

Martinec

Herman

Šebek

2017

Systems & Control Letters

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“…Closed-loop bit-mobility of the linearized reduced-order model, that is, the frequency response function from bit torque T bit to bit velocity ! bit for the linearized system (24). [Colour figure can be viewed at wileyonlinelibrary.com] 3674 T. VROMEN ET AL.…”

Section: A Simulation Case Studymentioning

confidence: 99%

Nonlinear output‐feedback control of torsional vibrations in drilling systems

Vromen

Wouw

Doris

et al. 2017

Intl J Robust & Nonlinear

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Summary This paper considers the design of a nonlinear observer‐based output‐feedback controller for oil‐field drill‐string systems aiming to eliminate (torsional) stick–slip oscillations. Such vibrations decrease the performance and reliability of drilling systems and can ultimately lead to system failure. Current industrial controllers regularly fail to eliminate stick–slip vibrations under increasingly challenging operating conditions caused by the tendency towards drilling deeper and inclined wells, where multiple vibrational modes play a role in the occurrence of stick–slip vibrations. As a basis for controller synthesis, a multi‐modal model of the torsional drill‐string dynamics for a real rig is employed, and a bit–rock interaction model with severe velocity‐weakening effect is used. The proposed model‐based controller design methodology consists of a state‐feedback controller and a (nonlinear) observer. Conditions, guaranteeing asymptotic stability of the desired equilibrium, corresponding to nominal drilling operation, are presented. The proposed control strategy has a significant advantage over existing vibration control systems as it can effectively cope with multiple modes of torsional vibration. Case study results using the proposed control strategy show that stick–slip oscillations can indeed be eliminated in realistic drilling scenarios in which industrial controllers fail to do so. Moreover, key robustness aspects of the control system involving the robustness against uncertainties in the bit–rock interaction and changing operational conditions are evidenced. Copyright © 2017 John Wiley & Sons, Ltd.

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“…At present, the torsional vibration measurement technology can be divided into contact type [24,25] and non-contact type, [26,27] according to the relative position relationship between the sensor and the measured axis. The contact torsional vibration measurement technology is a torsional vibration measurement method that the sensor is mounted on the measured axis and rotates along the measured axis [28,29]. Generally, it is necessary to use wireless transceiver or slip ring to output electrical signals on the rotating shaft.…”

Section: Introductionmentioning

confidence: 99%

Study on torsional vibration of RT60 crane transmission system

Xiao

Zhou

2020

Mechanics & Industry

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In the process of engineering use, the elastic coupling of the RT60 crane transmission system has a large noise and even breaks down sometimes. In this paper, RT60 crane transmission system is the research object. A finite element model and a discrete model for torsional vibration of transmission system are established by finite element method and lumped parameter method. Through the study of the finite element model and the vibration test of transmission system, the correctness of the system model, equivalent parameter, calculation method and MATLAB program are verified. Because of the high efficiency of the torsional vibration discrete system, the discrete model is used in this paper to replace the finite element model. The free vibration and response vibration of the crane transmission system are calculated and analyzed, and the reasons for the existence of the system noise are explained in the starting stage. Through the study of the vibration theory and the matching method of the elastic coupling, the CX-45-VFA-60-11 elastic coupling is proposed to replace the CX-45-VFA-11 elastic coupling. In this paper, the data signal is collected by the hall gear sensor, and the data are analyzed by the self-developed vibration tester. The vibration amplitude of the torsional vibration of the crane transmission system is greatly reduced by testing the transmission system of the replacement of the elastic coupling. This paper provides a theoretical guiding significance for the low noise design of the crane transmission system.

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Controlling torsional vibrations of drill strings via decomposition of traveling waves

Cited by 46 publications

References 11 publications

A travelling wave approach to a multi-agent system with a path-graph topology

A travelling wave approach to a multi-agent system with a path-graph topology

Nonlinear output‐feedback control of torsional vibrations in drilling systems

Study on torsional vibration of RT60 crane transmission system

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