Active vibration absorber and method

An active vibration absorber for absorbing vibrations in a member, the active vibration absorber comprising:

• an inertial mass for mounting on said member with a stiffness therebetween;
• a force actuator arrangement for applying a force between said inertial mass and said member;
• a first sensor arrangement for providing at least one first signal indicative of a velocity of said inertial mass;
• a damping control arrangement for controlling a damping of a resonance of said active vibration absorber by controlling said force actuator arrangement using said at least one first signal;
• a second sensor arrangement for providing at least one second signal indicative of at least one of movement and/or stress related parameters for said member;
• and
• a feedback control arrangement for controlling said force actuator arrangement using said at least one second signal to reduce the movement and/or stress in said member.

A method of absorbing vibrations in a member, the method comprising:

• mounting an inertial mass on said member with a stiffness therebetween;
• applying a force between said inertial mass and said member using a force actuator arrangement;
• damping a resonance of said inertial mass;
• providing at least one first signal indicative of at least one movement and/or stress related parameter for said member;
• providing at least one second signal indicative of a reaction of said inertial mass;
• and
• controlling the application of said force using said at least one first signal and said at least one second signal.

A method of absorbing vibrations in a member, the method comprising:

• mounting an inertial mass on said member with a stiffness therebetween;
• applying a force between said inertial mass and said member using a force actuator arrangement;
• providing at least one first signal indicative of a velocity of said inertial mass;
• controlling a damping of a resonance of said inertial mass by controlling said force actuator arrangement using said at least one first signal;
• providing at least one second signal indicative of at least one movement and/or stress related parameter for said member;
• and
• controlling said force actuator arrangement using said at least one second signal to reduce the movement and/or stress in said member.