Vibrations in mechanical systems are oscillations occurring without being intentionally
provoked. They often have detrimental effects on the system performance and may cause …

This paper considers general heterodirectional linear hyperbolic PDEs with boundary
actuation and collocated measurement, that are bidirectionally coupled with nonlinear ODEs …

Self-excited vibrations in drill-string systems are one of the main causes of failure and
efficiency reduction in drilling operations. To suppress these vibrations, an active control …

The main purpose of this contribution is the control of both torsional and axial vibrations
occurring along a rotary oilwell drilling system. The model considered consists of a wave …

This article proposes a control strategy to stabilize the axial–torsional dynamics of a
distributed drill-string system. An infinite-dimensional model for the vibrational dynamics of …

在油气井钻进作业过程中, 钻柱长期工作在充满钻井液的狭长井筒里, 其受到井底压力, 摩擦,
岩石硬度变化的影响, 受力情况非常复杂, 会产生多种形式的振动, 这些是影响钻具寿命和钻进 …

Adaptive backstepping with command control filtering is used to compensate torsional
oscillations of a drill-string in drilling rigs used in oil and gas explorations. The proposed …

Drill strings are subjected to complex coupled dynamics. Therefore, accurate dynamic
modeling, which can represent the physical behavior of real drill strings, is of great …

This paper proposed an equivalent input disturbance (EID)-based approach to control the
vertical down-hole drilling process. To describe a drill string which is typically long with large …

Sonic drilling technology uses the longitudinal vibration of a drill string to realize fast and
effective drilling. By setting the top and bottom boundary conditions of the drill string during …