Devices, systems, and methods for damping vibration of a structural component or power-transmission shafts are disclosed. Damping devices, systems, and methods utilize a lightweight damping device, which is targeted at reducing the resonant amplitude of the first several beaming modes and/or torsional modes of bending a structural component comprising a hollow shaft or strut. The damping device includes a stiff concentric tube with damping elements disposed at each end. The device is inserted within the original structural component or shaft and attached thereto. When the primary shaft undergoes bending due to modal characteristics, the damping elements react to dissipate energy, which effectively reduces the resonant amplitude.

A dynamic damper assembly may include a plurality of bodies arranged at predetermined intervals on an outer peripheral surface of a drive shaft, and an elastic body formed to surround each of the bodies and fixing each body to the drive shaft.

Vibration in a drill string is damped with a damping system coupled to the drill string. The damping system includes a chamber, a gas and piston in the chamber, and a mass connected to the piston. The gas defines a spring having a spring coefficient that is dependent on a volume or temperature of the chamber. The damping system is tunable in real-time by varying the volume or temperature of the chamber. In alternatives with multiple chambers interconnected to one another via ports, chamber volume at the existing pressure can be varied by selective actuation of valves between the chambers or the pressure of the gas can be varied by compressing or expanding a connected bellows or by heating or cooling the temperature of the gas. The damping system can selectively damp both radial and torsional vibrations.

The present invention relates a rotor assembly for an electrical machine (e.g. motor or generator) where a tuned vibration absorber adapted to provide radial damping is mounted directly to the rotor shaft.

A constructional unit for a drivetrain of a motor vehicle includes: at least one clutch arrangement configured to decouple an internal combustion engine from the drivetrain, the at least one clutch arrangement having at least one clutch element; a speed-adaptive vibration absorber apparatus, configured to reduce vibrations in the drivetrain with at least one damper mass deflectable along a deflection path; and a limiting device configured to exert a force on the at least one damper mass that limits the movement of the damper mass. The limiting device is further configured, for limiting the movement of the at least one damper mass, to be actuatable by the at least one clutch element.

A centrifugal pendulum having a pendulum flange, a first pendulum mass and a second pendulum mass and a spring arrangement, wherein the first pendulum mass and the second pendulum mass are positioned side-by-side in the circumferential direction, wherein the first pendulum mass is coupled with the pendulum flange by a first slotted guide and the second pendulum mass is coupled with the pendulum flange by a second slotted guide. The first slotted guide guides the first pendulum mass along a first oscillation path and the second slotted guide guides the second pendulum mass along a second oscillation path in an oscillating motion. The spring arrangement at least partially couples the first pendulum mass with the second pendulum mass, wherein at least one of the two pendulum masses has a receptacle. The spring arrangement includes a spring element and a protective device, wherein the protective device is positioned at least partially in the receptacle of the pendulum mass.

In a damper device, a dynamic damper is coupled to a first intermediate member, first and second inner-side springs that act in series with each other are straight coil springs disposed between a second intermediate member and a driven member so that outward movement of the springs in a radial direction of the damper device is restricted at respective both ends, and a gap is formed between each body portion of the first and the second inner-side springs and the second intermediate member or a spring abutment portion of the driven member.

Vibration in a drill string is damped with a damping system coupled to the drill string. The damping system includes a chamber, a gas and piston in the chamber, and a mass connected to the piston. The gas defines a spring having a spring coefficient that is dependent on a volume or temperature of the chamber. The damping system is tunable in real-time by varying the volume or temperature of the chamber. In alternatives with multiple chambers interconnected to one another via ports, chamber volume at the existing pressure can be varied by selective actuation of valves between the chambers or the pressure of the gas can be varied by compressing or expanding a connected bellows or by heating or cooling the temperature of the gas. The damping system can selectively damp both radial and torsional vibrations.