Optimising slew torque on a mining dragline via a four degree of freedom dynamic model

In this study, a dynamic model of a dragline is developed in the form of a fundamental non-linear rotating multi-body system with energy dissipation. Its dynamic behaviour is investigated using measured field data. Model predictions of dynamic behaviour and stresses during operation are investigated and a comparison with measured data presented. Preliminary results from an investigation into reducing fatigue duty via improved slew torque control are also presented. The dynamics of the dragline bucket swing motion during house slewing (rotation) are of particular importance for both structural loading and efficient operation