A control oriented guided tour in oilwell drilling vibration modeling
In drilling operations, the interaction of the drillstring with the borehole leads to vibrations
affecting the performance and increasing the drilling cost. The development of controllers to …
affecting the performance and increasing the drilling cost. The development of controllers to …
An integrated model for drill-string dynamics
WR Tucker, C Wang - Journal of sound and vibration, 1999 - Elsevier
The vibrational states experienced by the active components of a drilling assembly such as
that found in the oil or gas industry are discussed in the context of an integrated …
that found in the oil or gas industry are discussed in the context of an integrated …
Mechanical models of drillstrings with drag reduction oscillators and optimal design methods of vibration parameters in horizontal drilling
X Shi, W Huang, D Gao - Geoenergy Science and Engineering, 2023 - Elsevier
Engineering practices show that installation of oscillators on drillstring can effectively reduce
the axial drag and inhibit stick-slip vibration in horizontal drilling. However, the mechanisms …
the axial drag and inhibit stick-slip vibration in horizontal drilling. However, the mechanisms …
An earthworm-inspired friction-controlled soft robot capable of bidirectional locomotion
We present the design, fabrication, modeling and feedback control of an earthworm-inspired
soft robot capable of bidirectional locomotion on both horizontal and inclined flat platforms …
soft robot capable of bidirectional locomotion on both horizontal and inclined flat platforms …
Analysis and control of oilwell drilling vibrations
MBS Márquez, I Boussaada, H Mounier… - A Time-Delay Systems …, 2015 - Springer
Vibrations in mechanical systems are oscillations occurring without being intentionally
provoked. They often have detrimental effects on the system performance and may cause …
provoked. They often have detrimental effects on the system performance and may cause …
Torsional vibration control and cosserat dynamics of a drill-rig assembly
Aspects of drill-string vibrations in the context of a recently developed integrated model of a
drill-rig assembly based on the Cosserat theory of rods are discussed. Computer simulations …
drill-rig assembly based on the Cosserat theory of rods are discussed. Computer simulations …
[HTML][HTML] A soft crawling robot with a modular design based on electrohydraulic actuator
The soft structure of creatures without a rigid internal skeleton can easily adapt to any
atypical environment. In the same context, robots with soft structures can change their shape …
atypical environment. In the same context, robots with soft structures can change their shape …
An adaptive model uncertainty estimator using delayed state-based model-free control and its application to robot manipulators
In this article, we propose an innovative model-free control (MFC) algorithm using an
adaptive model uncertainty estimator (AMUE) that provides stable torque input while …
adaptive model uncertainty estimator (AMUE) that provides stable torque input while …
Motion of liquid drops on surfaces induced by asymmetric vibration: role of contact angle hysteresis
S Mettu, MK Chaudhury - Langmuir, 2011 - ACS Publications
Hysteresis of wetting, like the Coulombic friction at solid/solid interface, impedes the motion
of a liquid drop on a surface when subjected to an external field. Here, we present a …
of a liquid drop on a surface when subjected to an external field. Here, we present a …
[HTML][HTML] Development of a pressure-, velocity-, and acceleration-dependent phenomenological friction model using experimental data of sliding tests between 11 …
This paper experimentally investigates the frictional behavior between stainless steel and 11
polymers. Particularly, the dependence of the friction coefficient on the sliding velocity …
polymers. Particularly, the dependence of the friction coefficient on the sliding velocity …