LAUSR

During drilling into hard rocks, the vibration of telescopic drillstring for the rotary drilling rig becomes more severe, which not only leads to the fracture of drillstring, but also reduces the rock-breaking efficiency, the service life, and the reliability of the rotary drilling rig. A drillstring vibration absorber for the rotary drill rig was proposed based on nonlinear targeted energy transfer technology, and the theoretical model of the absorber was adopted. By applying the instantaneous nonlinear energy absorption rate of the absorber, the vibration responses of the system were predicted on different structure parameters and impact amplitudes. To evaluate the feasibility of the absorber, experiments were carried out. Moreover, the amplitude decrease rate was generated for various working conditions. Furthermore, the analytical results were verified by the experiment. The results indicate that the absorber has a distinct effect on vibration reduction.