Nonlinear mass damper with active centerband control

摘要

A mass damper (12) is attached to a machine tool (11) to suppress the vibration and oscillations induced by the machine tool. The mass damper uses a sensor (50) or transducer (70) to sense changes in vibration frequency or other physical action and control an actuator (56) to move a piston assembly (60). The piston assembly operates to increase or decrease compression on a spring (38) attached to a bob or moveable mass (18) within a housing (13) of the mass damper. The bob oscillates in opposite phase with the vibration induced by the machine tool to counteract the undesired vibration. The compression spring acts as a restoring force to bring the bob back to its neutral position. The change in compression on the restoring spring effectively changes the center frequency of the mass damper to keep the frequency response of the machine tool within the bandwidth of the mass damper.