Mitigation of rotational vibration using a torsional tuned mass damper

摘要

An apparatus for reducing vibration includes a damping assembly configured to be fixedly attached to a downhole component. The downhole component is configured to rotate within a borehole in an earth formation, and the damping assembly has a damping frequency that is tuned relative to a selected natural vibration frequency of the rotating downhole component to reduce vibration due to component rotation.

主权项

1. A system for reducing vibration, comprising:
a damping assembly configured to be fixedly attached to a downhole component, the downhole component configured to rotate within a borehole in an earth formation, the damping assembly including an auxiliary inertial mass connected to the downhole component via a spring configured to store mechanical energy in response to an applied torque, the inertial mass having a rotational vibration frequency that is selected relative to a selected natural vibration frequency of the rotating downhole component to reduce vibration due to component rotation, the inertial mass configured to vibrate at the selected rotational vibration frequency in response to vibration of the downhole component at the selected natural vibration frequency, the inertial mass configured to vibrate to deprive rotational vibration energy from the downhole component without excitation of inertial property of the inertial mass and a stiffness of the spring is adjustable to alter the selected rotational vibration frequency of the damping assembly.