We propose a controller that robustly stabilizes an interconnection of Ordinary Differential
Equations with two hyperbolic linear Partial Differential Equations. The proposed design …

A distributed model of a drill string with a collars section is presented with Coulomb friction
as a distributed source term. This model is capable of replicating stick slip oscillations as …

In this article, a systematic linear parameter-varying (LPV) model and a gain-scheduled
control methodology for drill-string systems are proposed to analyze drill-string dynamics …

A model for drill-string dynamics in arbitrary borehole geometries based on the Cosserat
rods theory is presented. The objective of this work is to exploit the capabilities of the …

Dynamics model learning deals with the task of inferring unknown dynamics from
measurement data and predicting the future behavior of the system. A typical approach to …

The use of recorded downhole rotational speed measurements with a bandwidth up to 9 Hz
gives new insights into the conditions under which stick-slip torsional oscillations occur …

In this paper, we present a filtering technique that robustifies stabilizing controllers for
systems composed of heterodirectional linear first-order hyperbolic Partial Differential …

In this article, we detail the design of an output feedback stabilizing control law for an
underactuated network of subsystems of heterodirectional linear first-order hyperbolic Partial …

In this paper, we present a comprehensive friction reduction model to investigate the
combined effects of pipe rocking and drilling agitator tools (DAT) on friction reduction during …

During drilling operations, drillstring vibrations cause many downhole dysfunctions, resulting
in underperformance, equipment failure, and possibly wellbore damage. Current drillstring …