In one embodiment, a centrifugal force generating device comprises a first hydraulic rotor, a second hydraulic rotor, and one or more hydraulic control valves. The first hydraulic rotor comprises a first mass and is configured to rotationally drive the first mass around a first axis of rotation using a first flow of hydraulic fluid through the first hydraulic rotor. The second hydraulic rotor comprises a second mass and is configured to rotationally drive the second mass around a second axis of rotation using a second flow of hydraulic fluid through the second hydraulic rotor. The one or more hydraulic control valves are configured to control the first flow of hydraulic fluid through the first hydraulic rotor and the second flow of hydraulic fluid through the second hydraulic rotor.

A damping system for damping rotary movements of a tailing arm. The system includes a chassis, a main shaft, and a rotary damping mechanism. The rotary damping mechanism includes a first externally-threaded gear attached fixedly to the main shaft, a guide rail attached fixedly to the chassis, a linear shock absorber, an internally-threaded gear associated with the first externally-threaded gear, and a first actuator configured to decouple the first externally-threaded gear from the linear shock absorber and couple the first externally-threaded gear with the linear shock absorber.

A device (1) for supporting an equipment (2), especially an upstanding electrical equipment from vibrations is disclosed. The device comprises a base plate (3), a set of support adapters (7), a set of viscous dampers (5) connecting the base plate to the support adapters and a set of wire rope dampers (6), wherein the set of wire rope dampers bear the base plate and connect the base plate to the support adapters. Further, the set of support adapters connect the viscous dampers and the wire rope dampers to a foundation plate by bolts or alternatively to a shake table via shake table adapters. A set of angular fixtures connect the support adapters to the base plate by means of the viscous dampers. In a preferred embodiment of the device the base plate is orthogonally shaped.

To provide a rotary inertia mass damper, which is capable of reducing an axial reaction force that is generated due to vibration having an excessive acceleration to the extent possible when the vibration is input, and of preventing breakage of the damper itself or a construction, provided is a rotary inertia mass damper, including: a first coupling portion, which is fixed to a first structure; a second coupling portion, which is coupled to a second structure; a screw shaft, which has one axial end connected to the first coupling portion and retained so as to be non-rotatable; a fixed barrel, which has a hollow portion for receiving the screw shaft, and is connected to the second coupling portion; and a rotary body, which is retained so as to be freely rotatable relative to the fixed barrel, is threadedly engaged with the screw shaft, and is configured to reciprocally rotate in accordance with advancing and retreating movement of the screw shaft relative to the fixed barrel. A torque limiting member is provided between an axial end of the screw shaft and the first coupling portion, and is configured to, when a rotational torque that exceeds a predetermined value is applied to the screw shaft, allow rotation of the screw shaft relative to the first coupling portion to reduce a rotation angle of the rotary body.

Embodiments of the invention are shown in the figures, where a method for manufacturing a gearbox, the method comprising: providing a predefined interval around an integer; providing a gearbox setup; determining a speed ratio of at least two components of the gearbox setup; comparing the speed ratio with the predefined interval around the integer; and manufacturing a gearbox in accordance with the gearbox setup in dependence on the comparison.

A device (1) for supporting an equipment (2), especially an upstanding electrical equipment from vibrations is disclosed. The device comprises a base plate (3), a set of support adapters (7), a set of viscous dampers (5) connecting the base plate to the support adapters and a set of wire rope dampers (6), wherein the set of wire rope dampers bear the base plate and connect the base plate to the support adapters. Further, the set of support adapters connect the viscous dampers and the wire rope dampers to a foundation plate by bolts or alternatively to a shake table via shake table adapters. A set of angular fixtures connect the support adapters to the base plate by means of the viscous dampers. In a preferred embodiment of the device the base plate is orthogonally shaped.

In one embodiment, a centrifugal force generating device comprises a first hydraulic rotor, a second hydraulic rotor, and one or more hydraulic control valves. The first hydraulic rotor comprises a first mass and is configured to rotationally drive the first mass around a first axis of rotation using a first flow of hydraulic fluid through the first hydraulic rotor. The second hydraulic rotor comprises a second mass and is configured to rotationally drive the second mass around a second axis of rotation using a second flow of hydraulic fluid through the second hydraulic rotor. The one or more hydraulic control valves are configured to control the first flow of hydraulic fluid through the first hydraulic rotor and the second flow of hydraulic fluid through the second hydraulic rotor.

An active damping system for a driveline includes a prop shaft configured to transmit engine power from an engine to a load, a sealed damper housing, and an active damping fluid contained within the sealed damper housing. A viscosity of the active damping fluid is changeable based on a torsional vibration of the prop shaft. The active damping system further includes a piston fixed to a side of the prop shaft and in communication with the active damping fluid. The piston is configured to rotate about an axis of the prop shaft. The system further includes a viscosity changing unit in communication with the active damping fluid, and a controller operatively connected to the viscosity changing unit. The controller is configured to cause the viscosity changing unit to change a viscosity of the active damping fluid. The viscosity of the active damping fluid changes the torsional vibration.

A main spindle device for a machine tool includes a main spindle, a cushioning member, and an arithmetic unit. The cushioning member is disposed on a position where a vibration displacement of a rotator exists. The arithmetic unit uses data of a tool to be used to analyze a vibration mode in a free vibration of the rotator based on a support rigidity of a bearing, masses of respective parts of the rotator including the tool, an attenuation coefficient, and an equation of motion derived from rigidity and inertia by a rotation. An outer diameter of a sleeve positioned outside the bearing is changed such that a position of an antinode of the vibration or a position on which a vibration displacement exists in the vibration mode matches a position of the cushioning member inside the main spindle to change a preload on the bearing.

To provide a rotary inertia mass damper, which is capable of reducing an axial reaction force that is generated due to vibration having an excessive acceleration to the extent possible when the vibration is input, and of preventing breakage of the damper itself or a construction, provided is a rotary inertia mass damper, including: a first coupling portion, which is fixed to a first structure; a second coupling portion, which is coupled to a second structure; a screw shaft, which has one axial end connected to the first coupling portion and retained so as to be non-rotatable; a fixed barrel, which has a hollow portion for receiving the screw shaft, and is connected to the second coupling portion; and a rotary body, which is retained so as to be freely rotatable relative to the fixed barrel, is threadedly engaged with the screw shaft, and is configured to reciprocally rotate in accordance with advancing and retreating movement of the screw shaft relative to the fixed barrel. A torque limiting member is provided between an axial end of the screw shaft and the first coupling portion, and is configured to, when a rotational torque that exceeds a predetermined value is applied to the screw shaft, allow rotation of the screw shaft relative to the first coupling portion to reduce a rotation angle of the rotary body.