According to one embodiment, a damper device includes a rotator, a first oscillator, a second oscillator, and two rollers, for example. The rotator is provided with a first opening. The second oscillator includes two guide surfaces recessed in a direction closer to a first center of rotation and a transmitting part capable of moving along the first opening. The two rollers each include a ring supported by the first oscillator and a shaft extending along a second center of rotation inside the ring and rotatably supported by the ring. The shaft comes into contact with a corresponding one of the two guide surfaces of the second oscillator pushed outward in the radial direction by centrifugal force, rolls along the corresponding one of the two guide surfaces by oscillation of the first oscillator, and is pushed by the corresponding one of the two guide surfaces in the circumferential direction.

According to one embodiment, a damper device includes a rotator, a first oscillator, a second oscillator, and two rollers, for example. The rotator is provided with a first opening. The second oscillator includes two guide surfaces recessed in a direction closer to a first center of rotation, and a transmitting part capable of moving along the first opening. The two rollers are rotatably supported by the first oscillator, come into contact with the respective two guide surfaces of the second oscillator pushed outward in the radial direction by centrifugal force generated by rotation of the rotator, and roll along the respective two guide surfaces by oscillation of the first oscillator and are pushed by the respective two guide surfaces in the circumferential direction. The second oscillator is capable of translation in the radial direction with the two guide surfaces supported by the respective two rollers.

An active vibration control device includes: a housing; a movable part including at least one movable mass member; an exciting coil that generates a magnetic field with an intensity corresponding to a current supplied to the exciting coil; a magnetic viscoelastic elastomeric member whose viscoelastic property changes in accordance with a magnitude of the magnetic field generated by the exciting coil; and a support member made of a non-magnetic material. The housing and the movable part are elastically connected with each other by both the magnetic viscoelastic elastomeric member and the support member.

A household appliance foot comprises a hydraulic plate; a sheath, fixedly connected with the hydraulic plate; a regulating foot, arranged in the sheath and being axially movable relative to the sheath; an accommodation chamber, formed by the hydraulic plate, the sheath and the regulating foot; a hydraulic medium, in the accommodation chamber and being compressed or expanding with pressure changes to drive the regulating foot to axially move in the sheath for leveling; a communicating device, communicating between at least two household appliance feet for allowing the hydraulic medium to flow between the household appliance feet; and a throttling structure, arranged in the communicating device for slowing down a flow velocity of the hydraulic medium. The throttling structures are arranged in the communicating devices, so that the rapid flowing of the hydraulic medium among the household appliance feet is prevented, and a regulating process can be more stable.

A balancer mechanism for a rotating shaft is configured to prevent deviation of the axis of the rotating shaft. The balancer mechanism (20) has an assistance torque generation device (21) for generating an assistance torque. The assistance torque generation device (21) includes a cam member (24) fixed to the rotating shaft (4), a cam follower member (25) and a gas spring (27). The balancer mechanism has a reaction force generation device (22) provided for generating, a balancing moment on the rotating shaft that cancels out a tilting moment that tilts the rotating shaft (4) around a bearing member (9) in a direction to separate it from the assistance torque generation device (21) and which is caused by the biasing force of the gas spring (27).

A mass flow controller includes an inlet, a flow path in which fluid passes, a mass flow sensor configured to provide a signal corresponding to mass flow of the fluid through the flow path; a control valve configured to regulate a flow of the fluid out of an outlet of the mass flow controller; and a passive damping system coupled to the control valve and configured to dissipate fluid flow induced vibrations introduced by the control valve assembly. The passive damping system includes a damping pad between a receiver section of a valve base and a diaphragm backer. The passive damping system can also include a damping washer. The passive damping system can include one or more plunger balls between the damping pad and the valve base or one or more wave springs.

A method for stabilizing transversal oscillations of a rotor including the steps of acquiring a first signal representing a value of transversal oscillations of a rotor; estimating a value of a thermal gradient from the first signal; computing a value of an actuation parameter from the value of thermal gradient; emitting an actuation signal representing the value of the actuation parameter.

A fluid damping structure is provided that includes an inner and outer annular elements, first and second ring seals, first and second outer annular seals. The inner annular element has an outer radial surface and a plurality of annular grooves disposed in the outer radial surface. The outer annular element has an inner radial surface. A damping chamber is defined by the inner and outer annular elements, and the first and second inner ring seal. A first lateral chamber is disposed on a first axial side of the damping chamber. A second lateral chamber is disposed on a second axial side of the damping chamber. A plurality of fluid passages are disposed in at least one of the inner annular element or the inner ring seals. The fluid damping structure is configurable in an open configuration and a closed configuration.

A weight applicator system includes a shaft, an applicator assembly, and a weight feed assembly. The shaft defines a length between a proximal end and a distal end configured to support a wheel-tire assembly for common rotation about a longitudinal axis of the shaft. The applicator assembly is supported by the shaft and includes a base portion disposed upon the shaft and operable to translate axially along the length of the shaft, a radial portion connected to the base portion and operable to radially move relative to the base portion between a retracted position and an extended position; and a pressure roller rotatably supported by the radial portion about an axis of rotation. The weight feed assembly is operable to feed a prescribed length of weighted material to the pressure roller.

A medical apparatus includes an elastic compensation member providing a first link that is rotatable with respect to a first rotational axis so that a display apparatus is movable, with a torque in an opposite direction to a torque acting due to a load of the display apparatus in order to compensate for the torque acting due to the load of the display apparatus, in order to minimize a length variation of the elastic compensation member despite movement of the display apparatus, a first end portion of the elastic compensation member is not fixed to the first link but is supported by an additional rotatable supporting portion so that the first end portion of the elastic compensation member is movable relative the first link while the display apparatus is being moved.