The invention relates to an industrial truck comprising

a chassis (6),
a mast (8) arranged on the chassis (6) in an upright position, a load-carrying apparatus (36), which has at least one load-receiving means (42) for receiving a load that is to be transported,
a support structure (9) that supports the load-carrying apparatus (36) on the mast (8) and can be moved, together with the load-carrying apparatus (36), upwards and downwards on the mast (8), and comprising
a device (54) for reducing vibrations,
wherein the device (54) for reducing vibrations has at least one additional mass body (60), which is supported by the mast (8) or the components connected thereto and is not constantly rigidly coupled to the mast (8) or the support structure (9) or the load-carrying apparatus (36), but is movably mounted by means of a bearing arrangement (62) such that it is movable relative to the mast (8) in response to mast vibrations, in particular to mast vibrations having horizontal vibration components, in order to counteract mast vibrations.

The protected mass (PM) of a vehicle collision event, is signaled for deceleration, by oscillation cycling, or a single transposition and/or DDD of the PM, in isolation of an unprotected mass (UPM).

A vehicle active damper includes a damping actuator that is provided between a radiator and a vehicle body so as to be interposed in a substantially vertical direction, and a coupling member that elastically couples between the vehicle body and an engine. The damping actuator is formed from a elastic modulus-variable member having an elastic modulus that varies according to the strength of an applied magnetic field. The coupling member transmits vibrations of the engine to the vehicle body along a substantially vertical direction.

A torsional vibration reducing device includes a rotating body, and a connection member. The rotating body has a plurality of guide holes. The rotating body includes a plurality of rolling bodies that are accommodated in the plurality of guide holes, respectively. The connection member connects the plurality of rolling bodies such that the plurality of rolling bodies moves integrally in the rotating direction of the rotating body. The connection member is supported so as to be reciprocally swingable in the rotating direction. A first moment that results from a weight of any one of the plurality of rolling bodies and rotates the connection member in a first rotating direction, a second moment that results from a weight of the other of the plurality of rolling bodies and rotates the connection member in a second rotating direction being applied to the connection member.

A turbomachine blade assembly including a turbomachine blade (1), in particular for a gas turbine, and at least one tuning element container including a housing (10) attached to the turbomachine blade and an insert (20) disposed in a recess (11) of this housing. A wall (20; 21) of the insert spaces apart two first cavities (31), which each accommodate at least one tuning element (40) provided for impacting contact with the housing (10) and the insert (20).

An apparatus for damping an actuator includes an inerter. The inerter includes a first terminal and a second terminal movable relative to one another along an inerter axis and configured to be mutually exclusively coupled to a support structure and a movable device actuated by an actuator. The inerter further includes a rod coupled to and movable with the first terminal and a threaded shaft coupled to and movable with the second terminal. The inerter further includes a flywheel having a flywheel annulus coupled to one of the rod and the threaded shaft. The flywheel is configured to rotate in proportion to axial acceleration of the rod relative to the threaded shaft in correspondence with actuation of the movable device by the actuator.

It is provided methods of installing a mechanical damper apparatus to an external surface of a tower of a wind turbine, the tower being in an erect state.

A vibration dampening engine mount configured to mount an engine to a vehicle frame includes: a first bolt receiver having a first through hole configured to receive a first bolt; a second bolt receiver having a second through hole configured to receive a second bolt; and a mass damper connector integrally connecting the first bolt receiver and the second bolt receiver, wherein the vibration dampening engine mount has a predetermined mass.

Described are systems for absorbing flexural waves acting on a structure. In one example, the system includes a first resonator connected to a structure at a first location and a second resonator connected to the structure at a second location. The distance between the first location and the second location is based on a frequency of a flexural wave acting upon the structure and an orientation of the first resonator and the second resonator with respect to each other.

A hybrid rotational passive energy absorber (100) is configured to mitigate effects of a load on an attached system. An axle (170) is anchored to a housing (110) at a first axle end and a second axle end. A free swinging weighted arm (180) includes a beam (130) having a length L, a pivot portion (185) disposed at a first end of the beam, and an internal mass (120) at a second end of the beam. A bearing (160) rotatably connects the pivot portion to the axle. The bearing is configured to provide smooth motion of the weighted arm around an axis (150) of the axle in a rotation and/or oscillation plane orthogonal to the axis.