Using passive nonlinear targeted energy transfer to stabilize drill-stringsystems

Torsional vibrations of drill strings used in drilling oil and gas wells arises from a complex interaction of the dynamics of the drilling structure with speed-dependent effective rock-cutting
forces. These forces are often difficult to model, and contribute
substantially to the instability problems of controlling the drilling
operation so as to produce steady cutting. In this work we show how nonlinear passive targeted energy transfer to a lightweight attachment can be used to passively control these instabilities. This is performed by means of a nonlinear energy sink (NES), a lightweight attachment which has been
shown to be effective in reducing or even completely eliminating self-excited
motions in aeroelastic and other systems. The NES is a
completely passive, inherently broadband vibration absorber
capable of attracting and dissipating vibrational energy from
the primary structure to which it is attached, in this case a nonlinear discontinuous model of
a drill-string system. In this paper we describe a prototypical
drill string-NES system, briefly discuss some of the analytical
and computational tools suitable for its analysis, and then
concentrate on mathematical results on the efficacy of the NES in
this application and their physical interpretation.