31results about "Inertia effect dampers" patented technology

The invention involves a triangular prismatic tuned mass damper suitable for large-span or cantilever structures, including a triangular prism box, particle damping units inside the triangular prism box, and a steel mass block. Below the triangular prism box are high-damping springs. The particle damping unit consists of a particle damping cavity, particles of three different sizes, and foam rubber pads. When the structural vibration amplitude is small, the particles dissipate energy by compressing the foam rubber pads and rolling. When the amplitude of structural vibration is large, the energy is dissipated by the collision of particles and the compression of the foam rubber.

A method for monitoring a fluid filled damper (1) of a wind turbine (10) is described. The method for monitoring a fluid filled damper (1) of a wind turbine (10) comprises the steps of measuring a pressure value (PV) inside a fluid filled damper (1) of the wind turbine (10), comparing the pressure value (PV) with a predetermined threshold value (TH) and initiating an idle state of the rotor (5) of the wind turbine (10) if it is detected that the threshold value (TH) has been exceeded. Further, a leak monitoring device (6) is described. Additionally, a wind turbine (10) is described.

This invention provides a highly versatile impact energy absorption mechanism that can absorb the impact energy of a colliding object regardless of its installation location. [Solution] The impact energy absorption mechanism consists of a collision receiving part 10, a disc 20, and a specific link mechanism 30. The collision receiving part 10 is movable with one degree of freedom in the collision direction of the colliding object 1. The disc 20 has a one-way clutch 21 and a handle connection point 22 for rotating the disc around a rotation axis. The specific link mechanism 30 is designed to prevent the impact on the colliding object 1 from being transmitted to the collision receiving part 10 during the collision and to prevent the impact on the colliding object 1 when it has finished stopping. One end of the specific link mechanism 30 is connected to the collision receiving part 10 so as to be axially rotatable on an axis perpendicular to the collision direction of the colliding object 1, and the other end is connected to the handle connection point 22 so as to be axially rotatable on an axis in the same direction as the rotation axis of the disc 20.

The present invention relates to a damper for a vibration machine, in particular for a vibrating conveyor for conveying bulk material and / or for a screening machine for screening bulk material, having a compensation system for compensating vibration forces generated by a vibrating mass. According to the invention, the compensation system has at least one spring with modifiable spring hardness.

The present invention relates to a device, use of device, and method of reducing vibrations in a structure. The method comprises a step of rotating a first element (11) in a first rotational plane (P1) and a second element (22) in a second rotational plane (P2) parallel to the first rotational plane (P1) around the rotational axis (2). The first element (11) has a first mass (M1) arranged with a distance (R1) from the rotary axis (2) in the first rotational plane (P1), and the second element (22) has a second mass (M2) arranged at a second distance (R2) from the rotary axis (2) in the second rotational plane (P2). The first and second element (11,22) are rotated in opposite directions around the rotational axis (2) with the centres of mass passing a line extending from the rotational axis (2) and outwards in a predetermined direction.

This invention provides an inertial-capacitive damper, disposed between a first connecting mechanism and a second connecting mechanism and located within a protective sleeve. The first connecting mechanism is fixedly connected to one end of the protective sleeve, and the second connecting mechanism is located at the other end of the protective sleeve. A flywheel is rotatably connected within the protective sleeve near the first connecting mechanism. A threaded sleeve is fixedly connected within the flywheel, and a threaded rod is screwed into the threaded sleeve. The threaded rod is fixedly connected to a rotating frame. The flywheel, threaded sleeve, threaded rod, and rotating frame are coaxially arranged. A spring is wound around the outer side of the threaded sleeve. The second connecting mechanism sequentially connects a ball screw, a gearbox, a damping rod, and a rotating connector from near to far. The ball screw is movably connected to the second connecting mechanism, passes through the gearbox, and is fixedly connected to the damping rod. The distal end of the damping rod is fixedly connected to the rotating connector. The advantages of this invention are: reasonable structural design, effective vibration reduction and buffering, and improved service life and operational stability.

A vibration damper comprises a base (3) for mounting on a vibrating substrate (6), an inertial mass (1), and an elastic element (2) connecting the base (3) to the inertial mass (1). At least part of the inertial mass (1) and the elastic element (2'*) are formed from a single piece of wire.

A system for damping lateral vibrations includes a body configured to be connected to a downhole component of a system for performing a subterranean operation, the body having a longitudinal axis, and a cavity disposed within the body. The cavity has a selected width in an at least partially lateral direction, and the at least partially lateral direction has a directional component that is orthogonal to the longitudinal axis. The system also includes a moveable element disposed in the cavity, the moveable element being free to laterally move relative to the cavity in the at least partially lateral direction in response to a lateral vibration of the body. Lateral movement of the moveable element resists the lateral vibration and dampens a magnitude of the lateral vibration.

Devices, systems, and methods are provided to treat tremor in a subject. Devices, systems and method may comprise a wearable based configured to be worn over at least a part of a joint of the subject; at least one flywheel-spring-damper system (FSD) comprising at least one housing configured to be coupled to the wearable base; and at least one flywheel configured to counteract tremor movements in the subject, wherein the flywheel-spring damper system is configured to be coupled to the wearable base. The tremor may be a tremor in an outer extremity, typically a hand, of a subject.

The invention describes a temporary damper assembly (1) for use during vertical storage and / or vertical transport of a tower (2), which damper assembly (1) comprises a liquid damper (10) tuned to the natural frequency of vibration of the tower (2); a tower cover (11) realised to cover an annular upper opening (20) of the tower (2) during storage and / or transport; a mounting interface (12) configured to suspend the liquid damper (10) from the annular upper opening (20) of the tower (2); and a load transfer interface (13) for the transfer of loads (F) between the liquid damper (10) and the tower (2). The invention further describes a method of suppressing vortex-induced vibration in a tower (2) during vertical storage and / or vertical transport of the tower (2).

The invention relates to a workpiece table (1) for a machine tool, comprising a base support (11) having a machine interface (15, 16) designed for coupling with a machine frame of a machine tool, and having a support receptacle (19) for coupling with a workpiece carrier (51), and a workpiece carrier (51) comprising a support body (52), an auxiliary mass (53) and a pull piece (54), wherein the support body (52) is provided on a top surface (71) with a workpiece receptacle (56) for clamping a workpiece and on a bottom surface has a coupling section (59) for coupling with the support receptacle (19), wherein the auxiliary mass (53) is mounted linearly movable on a contact surface (61) of the support body (52) and wherein the pull piece (54) is designed for normal force transmission between the support body (52) and the auxiliary mass (53), wherein the auxiliary mass (53) has a variable-size contact area (62;74) with the contact surface (61) such that the auxiliary mass (53) and the contact surface (61) form an auxiliary mass damper with adjustable damping effect.;

To provide a technology capable of suppressing manufacturing cost.SOLUTION: When a floor part 11 vibrates, a support body 50 also vibrates through a spring 80. When the support body 50 moves upward, the spring 80 shrinks, a second column member 43 is pushed upward, a first column member 41 is brought into a shape like pushing the left end part of a vibration transmission member 45 downward. Thereby, a tooth row part 49 is lifted to rotate a gear 30 and turn a weight 20 clockwise. Meanwhile, when the support body 50 moves downward, the spring 80 expands, the second column member 43 is pulled downward, and the second column member 43 is lowered downward with the position of the first column member 41 being kept as it is, so that the left end part of the vibration transmission member 45 is lifted. Thereby, the tooth row part 49 is lowered to rotate the gear 30 and turn the weight 20 anti-clockwise. Since a rotary inertia mass is generated by rotating the weight 20, a large rotary inertia mass can be generated even with a small weight 20, thereby achieving reduction in size and weight while suppressing manufacturing cost of a vibration control device 10.SELECTED DRAWING: Figure 1

This invention relates to a tuned damper and a monorail for controlling vortex-induced vibration of a monorail main beam. The damper includes a damping box, a mass block assembly, a spring, a guide shaft, a guide assembly, and damping fluid. One end of the spring is connected to the bottom of the damping box cavity, and the other end is connected to the bottom of the mass block assembly. One end of the guide shaft is connected to the bottom of the damping box cavity, and the other end is connected to the top of the damping box cavity, passing through the mass block assembly. The guide assembly is fixedly connected to the mass block assembly and symmetrically arranged on both sides of the guide shaft. The damping fluid is disposed within the damping box cavity. The advantages of this invention are: 1. By limiting lateral displacement through the guide assembly, stability is increased; 2. Adjusting the base allows for adjustment of the gap between the roller and the guide shaft without affecting the vertical vibration of the mass block assembly, thus promoting stable and long-term operation of the device; 3. The mass block assembly optimizes the adjustment efficiency.

A tunable mass damper assembly is attachable to a rotor blade. The tunable mass damper assembly comprises a base configured to be attached to the rotor blade and a pendulum mass structure movably attached to the base and configured to move relative to the base in accordance with a rotational speed of the rotor blade about a rotor axis. The pendulum mass structure is configured to reduce vibratory forces of the rotor blade induced by a rotation of the rotor blade about the rotor axis. An entirety of the pendulum mass structure being configured to be contained within and enclosed by the rotor blade.

The application discloses a self-tuning vibration absorption device and belongs to the technical field of heavy forging and pressing equipment. The device comprises a base, a central supporting shaft, a main counterweight and a secondary sliding mass. The base is used for connecting a device to be absorbed. The base is provided with the central supporting shaft. The base and the central supporting shaft vibrate with the vibration of the device to be absorbed. The main counterweight is rotationally connected to the central supporting shaft. The main counterweight is provided with a guide rail. The secondary sliding mass linearly slides on the guide rail. The mass center sliding track of the secondary sliding mass is on a first straight line. The first straight line is perpendicular to the axis of the central supporting shaft. The first straight line, the axis of the central supporting shaft and the mass center of the main counterweight are located on a first plane. The application can absorb energy through the deflection of the main counterweight. The secondary sliding mass on the main counterweight is radially moved outward by centrifugal force, thereby gradually reducing the natural frequency of the deflection energy absorption component, so as to ensure the vibration absorption effect.

An apparatus is provided. The apparatus includes an equipment support structure configured to support a semiconductor fabrication component. The apparatus includes a damper assembly configured to resist a lateral force induced by a seismic event to the equipment support structure. The damper assembly includes a gear rack coupled to the equipment support structure. The damper assembly includes a first flywheel assembly including a first mass damper flywheel and a first gear meshed with the gear rack and selectively engaged with the first mass damper flywheel.

Headrest (1) which includes: a headrest strut (3) with one or more legs (3a) attached to an upper part of a backrest; a housing body (5) comprising a front housing part (10) and a rear housing part (20), wherein the housing body (5) is mounted on an upper part of the headrest strut (3); a headrest cushion (2) as padding material that covers the housing body (5); a mass body (7) for vibration suppression, which is arranged to be oscillating within the housing body (5); and an elastic body (30, 40) suitable for supporting the mass body (7) and arranged within the housing body (5), wherein: the elastic body (30, 40) comprises a front elastic body (30) and a rear elastic body (40), the front elastic body (30) comprises a front locking section (34) for attachment to a rear side of the front housing part (10) and a front extension piece (30a) extending from the front locking section (34) along the rear side, the rear elastic body (40) comprises a rear locking section (44) for attachment to a front face of the rear housing part (20) and a rear extension piece (40a) extending from the rear locking section (44) along the front face, and the front locking section (34) and the rear locking section (44) are arranged separately from each other in a vertical and / or horizontal direction with the mass body (7) in between.

This invention discloses a locally resonant phonon crystal unit cell, a vibration reduction structure, and an installation method, belonging to the field of track vibration reduction technology. The locally resonant phonon crystal unit cell includes a silicone rubber matrix as the outer ring, with a steel scatterer disposed within the cavity of the silicone rubber matrix. The steel scatterer and the silicone rubber matrix are connected and fixed by a soft material encapsulation layer. Four spring-mass subsystems are nested within the steel scatterer. The inner cavity sidewalls of the silicone rubber matrix are also encapsulated with a soft material. Using the locally resonant phonon crystal unit cell, vibration reduction structure, and installation method described in this invention can solve the problem of poor vibration reduction effect of existing vibration reduction measures for low-frequency vibrations.

The present invention relates to a boring bar (1000) with active dampening means (101) for lessening vibration in a machine tool, a head (102), a main body (100) of the bar (1000), a central area (21) and a peripheral area (22) of the bar (1000). The dampening means (101) comprise at least one electromagnetic effect actuator (1) with at least one casing (11) enclosing a respective cavity (12), at least one inertial mass (3), arranged in the cavity (12) which is movable with respect to the casing (11) of the actuator (1) due to the effect of an electromagnetic field. The actuator (1) is located in a respective housing (23), conjugate to the casing (11), in the peripheral area (22) of the bar (1000). The dampening means (101) comprise a set of coils (4) and permanent magnets (5), configured to act on the same plane perpendicular to the longitudinal direction.

The application provides a double nonlinear energy sink device and a control system and method for damping of a floating wind turbine, comprising: a main track (4) and a secondary track (5), the surfaces of which are covered with rubber pads; a main rolling mass (7) moving along the main track (4); a ball (3) rolling on the secondary track (5); a spring leg (6) connecting the main rolling mass (7) and the ball (3) and being compressed or stretched to generate a restoring force according to the moving direction; wherein the restoring force is essentially nonlinear, and the nonlinearity is derived from the coupled motion of the main rolling mass (7) and the ball (3) and the joint action of the track specific geometry. Based on the design, the device can effectively realize multi-modal vibration control, has the advantages of anti-tuning robustness, wide-band damping capacity, improved control performance under weak excitation, impact-enhanced energy dissipation mechanism and compact and lightweight, etc.

The present disclosure relates to a damping system for counteracting oscillations in a structure. The damping system comprises a pendulum device and a container containing a viscous medium. The pendulum device comprises a mass body comprising a porous structure. The porous structure is configured to allow the viscous medium to pass through it. The porous structure is at least partially immersed in the viscous medium.

The application discloses a quasi-zero stiffness vibration isolator with pre-pressing adjustment, and belongs to the technical field of mechanical vibration control. In view of the defects of the existing vibration isolation device, such as poor low-frequency vibration isolation effect, insufficient flexibility of stiffness adjustment, single damping characteristic, insufficient operation reliability and the like, the application adopts a main bearing mechanism to cooperate with umbrella-shaped auxiliary spring units arranged in a circumferential symmetry to construct a quasi-zero stiffness system, integrates a pre-pressing adjustment mechanism to realize multi-stage accurate adjustment of stiffness, and is matched with multiple damping energy dissipation components to strengthen vibration attenuation capacity. The application can significantly improve low-frequency vibration isolation performance, widen the working condition adaptation range, greatly improve vibration energy dissipation efficiency, and at the same time, has high structural modularization degree, is convenient for processing, assembly and maintenance, has low manufacturing cost, and can be widely applied to micro-vibration control scenes of various high-end precision equipment.

The present invention relates to the technical field of offshore wind power equipments and discloses a jacket platform and an offshore wind power structure. The jacket platform of the present invention comprises a frame body and a damping and vibration-reducing device; wherein the damping and vibration-reducing device comprises a shell, a damper, a displacement amplification assembly and a connection assembly; the shell is hinged on a top of the frame body; the damper and the displacement amplification assembly are arranged in the shell, and the damper is connected with a power output end of the displacement amplification assembly; the connection assembly comprises a plurality of connection cables; one end of each connection cable is connected with a power input end of the displacement amplification assembly, and the other end of each connection cable extends out of the shell and is connected to the frame body, and every two adjacent connection cables are arranged to have an included angle therebetween. The damping and vibration-reducing device in this jacket platform can realize displacement amplification, enabling the damper to give full play to its vibration-reducing effect, and moreover, it can achieve vibration reduction in multiple directions, thus having a good vibration-reducing effect and being suitable for use in the complex sea-current load environment of the ocean.

A control arrangement (600) for controlling torsional vibration of a structure (610), the control arrangement comprising a body (620) and a control element configuration (630) providable along the body, wherein the body is couplable to the structure, wherein the control arrangement further comprises an active control apparatus (640) wherein, in use, the active control apparatus is operable to control the wave speed of torsional vibration of the body.

A wind turbine tower comprising a multi-stage suspension damper and a multi-stage suspension damper (1) for damping a structure, the multi-stage suspension damper (1) comprises - one or more frame structures (10) including an innermost frame structure (10I) comprising an innermost frame top part (12I) and an innermost frame bottom part (14I), wherein the innermost frame top part (12I) and the innermost frame bottom part (14I) are interconnected and define an innermost frame structure height (16I), wherein the innermost frame structure (10I) is suspended by three innermost rods (18I) or three innermost cords (18I) connected to the innermost frame bottom part (14I) and extending from another frame structure (10) of the one or more frame structures (10) or the three innermost rods (18I) or the three innermost cords (18I) are adapted to be connected to an object; - a pendulum (50) suspended by a pendulum rod (52) or a pendulum cord (52) from the innermost frame top part (12I), wherein the pendulum rod (52) or pendulum cord (52) is longer than the innermost frame structure height (16I), wherein the pendulum (50) comprises a pendulum mass.