This paper demonstrates a theoretical and experimental study on a universal vibro-impact
system with bidirectional drift. With a dedicated experimental rig that is able to verify …

An ability to exchange between different attractors can bring adaptability and new
functionalities to an engineering system. While nonlinear controllers are widely used to …

This paper studies the problems of stick-slip mitigation and speed tuning for a lumped-
parameter drill-string system by using a proportional-derivative feedback controller via path …

In view of the vibration failure of drilling string system in ultra-high temperature and high
pressure (ultra-HPHT) curved wells, an axial-lateral-torsion coupling (ALTC) nonlinear …

In this work, a dynamic model is proposed to simulate the drilling and steering process of an
autonomous burrowing mole to access scientific samples from the deep subsurface of the …

The control of multibody drill-string systems is not easy and designing such systems is
considered challenging because of the difficulty in the dynamic analysis of its nonlinear …

In this paper, the surface morphology method is improved and the bit-rock interaction model
between the rock and the PDC bit is studied, considering the influence of blades' shape and …

This paper studies a control method for switching stable coexisting attractors of a class of
non-autonomous dynamical systems. The central idea is to introduce a continuous path for …

In this paper, we study the nonlinear dynamics of a drill string under the effect of external
loads in a supersonic gas flow, taking into account supporting stabilizers. The case of the …

The sustainability of oil and gas well drilling operations is a vital issue from an economic and
safety point of view. One of the practical methods to predict the continuation of the drilling …