Abstract: A tuned mass damper comprising a frame, at least one bendable spring element being connected from its ends to the frame, and at least one mass element being connected to the spring element at a distance from the ends of the spring element, at least one movable spring support element for adjusting the tuning frequency of the damper, and means for moving the spring support element.

Abstract: A tuned mass damper comprising a frame, at least one bendable spring element being connected from its ends to the frame, and at least one mass element being connected to the spring element at a distance from the ends of the spring element, at least one movable spring support element for adjusting the tuning frequency of the damper, and means for moving the spring support element.

Abstract: A dampening element for a vibration damper and a vibration damper. The dampening element comprises a body part having flow openings, a dampening part arranged to abut against the body part, the dampening part having openings aligning with the flow openings of the body part. In addition, a cover part is arranged against the dampening part, the cover part being movable in relation to the dampening part for changing the cross-sectional flow area of the openings of the dampening part.

Abstract: A vibration damper comprising a body part via which the damper can be fastened to the object to be dampened, an oscillating piece movably arranged in the space of the body part and fastened by at least one spring to the body part, the oscillating piece consisting of more than one part, removably fastened to each other. The invention also relates to a method of producing a vibration damper and an arrangement of reducing the vibration in a piston engine.

Abstract: A dampening element for a vibration damper and a vibration damper. The dampening element comprises a body part having flow openings, a dampening part arranged to abut against the body part, the dampening part having openings aligning with the flow openings of the body part. In addition, a cover part is arranged against the dampening part, the cover part being movable in relation to the dampening part for changing the cross-sectional flow area of the openings of the dampening part.

Abstract: A vibration suppressor and a vibration damper are configured in a system consisting of an internal combustion engine and an exhaust-gas turbo charger. The vibration suppressor and vibration damper are secured to an exposed place on the system which is subjected to strong vibrations. As the vibrations are the strongest in said area, the vibration-reducing means can be used to a maximum. The system consisting of the internal combustion engine and the exhaust-gas charger is improved in such a manner that the internal combustion engine can be operated in all of the rotational speed ranges without reducing the service life of individual components or the entire system.

Abstract: A vibration damper comprising a body part via which the damper can be fastened to the object to be dampened, an oscillating piece movably arranged in the space of the body part and fastened by at least one spring to the body part, the oscillating piece consisting of more than one part, removably fastened to each other. The invention also relates to a method of producing a vibration damper and an arrangement of reducing the vibration in a piston engine.