212results about "Inertia effect dampers" patented technology

According to the present invention there is provided an active vibration control system comprising: an electromagnetic actuator and a control element, the electromagnetic actuator being operable to apply a force on a base structure to which the active vibration control system is attachable such that vibrations of the base structure are actively controllable by the application of said force, wherein the electromagnetic actuator and control element are relatively moveable such that the active vibration control system has at least two modes of vibration, and wherein movement of the electromagnetic actuator causes movement of at least a part of the control element.

A vibration absorber arrangement (1) is provided, in particular for tall slender structures, comprising a supporting structure (8), an absorber mass (2) which comprises a center of mass (3), and at least one wheel (4, 5) by means of which the absorber mass (2) is movable on a concavely curved rail arrangement (6), which is connected to the supporting structure (8), from a stable central position in two opposite directions, wherein a friction damper device (9) is provided. One wants to be able to adapt such a vibration absorber arrangement in a simple manner to different operating requirements. For this, it is provided that the friction damper device (9) is adjustable between a first state, in which it does not interact with the absorber mass (2) or only dampeningly, and a second state, in which it controlledly brings a movement of the absorber mass (2) to a standstill.

The invention relates to a self-adaptive tuning inerter damping device and method for suppressing vertical micro-vibration of a structure. The self-adaptive tuning inerter damping device comprises a bearing base, a tuning mass block, a vibration system connecting the bearing base and the tuning mass block, a pneumatic control system and an intelligent measurement and control system. The vibration system is formed by connecting an outer side air spring set and a central air spring in series with a hydraulic inerter unit, an adjustable damping branch and a fixed inerter branch which are connected in parallel are integrated in the hydraulic unit and are respectively provided with an electro-hydraulic proportional valve and a spiral pipe type hydraulic inerter, so that adjustable damping and mass amplification are realized. The pneumatic system adjusts the air pressure of each air spring through an independent air path and a proportional valve so as to change the rigidity. An intelligent system monitors vibration through a sensor, a central controller identifies excitation frequency and optimizes parameters based on a kinetic model, and rigidity and damping are synchronously adjusted. According to the invention, the problem that a mechanical inerter is insufficient in response to micro-vibration is solved, the defects that a traditional passive device is narrow in frequency band and easy to detune are overcome, and broadband, self-adaptive and high-performance suppression of vertical micro-vibration of a structure is realized.

The invention belongs to the technical field of vibration isolation, and particularly relates to a quasi-zero stiffness metamaterial sandwich structure, a vibration isolation device and a manufacturing method. The quasi-zero stiffness metamaterial sandwich structure is formed by periodically arranging unit cells in the horizontal direction, and each unit cell comprises an upper panel, a lower panel, a QZS resonator core body and a vertical supporting column; the QZS resonator core comprises a central mass block, QZS resonator units are arranged on the upper portion and the lower portion of the central mass block in a mirroring mode, each QZS resonator unit is composed of two quasi-zero-stiffness unit cells which are arranged in a crossed mode, and each quasi-zero-stiffness unit cell is composed of a negative-stiffness component comprising a horizontal curved beam and a positive-stiffness component comprising an oblique straight beam. According to the sandwich structure, the quasi-zero-stiffness resonator of a novel structure serves as a core body, wider application in the ultra-low frequency vibration reduction field can be achieved, the band gap is adjustable, and the problems that a traditional metal base material structure is high in band gap frequency and limited in application field can be solved.

A composite damping device for vibration reduction of a tower drum and blades of an offshore wind turbine belongs to the technical field of vibration reduction of wind driven generators, and is characterized by comprising a blade integration unit and a tower drum tuning unit, the blade integration unit adopts a cylindrical particle damping cavity, the center of the cylinder is connected with a mass ball through a spring, and the cavity is filled with damping particles; the steel wire rope is fixed in the blade to restrain vibration displacement; the tower tube tuning unit is connected with the mass block through a steel wire rope, the mass block is circumferentially provided with the springs and connected with the tower tube wall, the lower portion of the mass block is connected with the mass ball, and the upper periphery and the lower periphery of the mass block are connected with the tower wall through the hydraulic inerter dampers. And the working space is obviously reduced, the multi-direction vibration control capability is improved, and the method is suitable for vibration control of offshore wind turbine towers and blades.

The invention belongs to the technical field of precision equipment vibration reduction supporting structures, and particularly relates to a precision equipment vibration reduction supporting structure based on an elastic metamaterial, which comprises a precision equipment bottom plate, the precision equipment bottom plate is fixedly welded at the bottom of precision equipment, and the precision equipment bottom plate is fixedly mounted on the mounting ground through fastening bolts. And a damping mechanism is arranged between the precise equipment bottom plate and the fastening bolt. The interiors of the lower vibration reduction columns, the middle vibration reduction columns and the adjusting vibration reduction columns are divided into a plurality of cell structures through the regular hexagonal hole channels distributed in the lower vibration reduction columns, the middle vibration reduction columns and the adjusting vibration reduction columns in a honeycomb array mode, and the cell structures deform to absorb vibration energy and have the reflection and refraction effects on vibration; and finally, wide-frequency-domain and high-efficiency vibration suppression is achieved, stable operation of precision equipment is ensured, the vibration reduction effect is extremely good, and the problems that a traditional rubber vibration reduction pad is narrow in vibration reduction frequency band, and a spring vibration reducer is prone to resonance are solved.

The utility model discloses a steel lining plastic storage tank with a pipe orifice sealing structure. The steel lining plastic storage tank comprises a steel lining plastic storage tank main body, the sealing assembly is arranged at the top of the steel lining plastic storage tank main body; the sealing assembly comprises a pipe body, a hollow sleeve, an air bag ring, a pipe plug, a pressing plate, threads and a rotary knob, the bottom end of the pipe body fixedly communicates with the top of the steel lining plastic storage tank body, the hollow sleeve is fixedly installed in the pipe body, the bottom of the air bag ring is fixedly connected with the top of the hollow sleeve, and the bottom of the pipe plug is in threaded connection with the interior of the hollow sleeve. The threads are formed in the bottom of the pipe plug and the hollow sleeve and used for connecting the pipe plug and the hollow sleeve, the pressing plate is fixedly installed in the middle of the pipe plug and makes contact with the air bag ring, and the rotary knob is fixedly installed on the top of the pipe plug. According to the scheme, the steel lining plastic storage tank body and the sealing assembly are arranged, the gap of the pipe opening of the pipe body is sealed, and the situation that air enters the steel lining plastic storage tank body and reacts with materials in the steel lining plastic storage tank body, and consequently the material quality is affected is avoided.

The application discloses an adjustable nonlinear dynamic vibration absorber and system, and has the technical scheme that a tuning mass block is slidably connected to the surface of a support plate, and first scissor structures are rotatably connected between the tuning mass block and the two ends of the support plate; the first scissor structures are provided with second scissor structures and dampers, the second scissor structures and the dampers can drive the first scissor structures to stretch and contract through elastic belts, the second scissor structures are provided with elastic elements for driving the second scissor structures to stretch and contract; the stretching direction of the elastic elements is parallel to the sliding direction of the tuning mass block, and is perpendicular to the damping direction of the dampers, so that the first scissor structures and the second scissor structures can realize vibration absorption through geometric nonlinearity when moving. The stiffness and damping characteristics of the application can be adjusted, and the linear elements can be used to realize nonlinear stiffness, damping and super-low natural frequency, and the problem of Duffing system instability that cannot be eliminated by traditional nonlinear vibration absorbers is solved.

An electromagnetic actuator assembly, integrated within a boring tool, for controlling unwanted machining vibration, comprising an outer tubular oscillating mass made of ferromagnetic material, through which the magnetic flux can pass; an inner stator that comprises an electromagnet assembly, located at the center of the tubular oscillating mass, for applying a controllable magnetic field to the oscillating mass; one or more damping elements, each having one or more springs and / or a damping material with predetermined stiffness and damping properties (such as a polymer or oil); a controller for providing a desired current to the electromagnets of the electromagnet assembly to obtain the controllable magnetic field; a holder for allowing the rotation of the electromagnet assembly to a desired angle, for stimulating the oscillating mass to apply a damping force, based on a combination of the magnetic field and stiffness and damping properties, which is aligned with the direction of the unwanted vibration.

The invention provides a resonance unit, a damping device and an applicable reactor thereof. The resonance unit comprises: a substrate having a first surface and a second surface opposite to each other, and an outer peripheral surface located between the first surface and the second surface; the resonance block is located on the first surface and the second surface, and the resonance block comprises a rigid material; the connecting unit comprises a connecting frame and a plurality of connecting columns, the connecting frame surrounds the base plate, each connecting column comprises a first end face and a second end face which are opposite to each other, the first end face is connected with the peripheral face of the base plate, the second end face is connected with the inner wall of the connecting frame, and the connecting unit comprises a flexible material. According to the resonance unit, the damping device and the applicable reactor, low-frequency vibration generated in the operation process of equipment in the reactor can be effectively inhibited, so that the service life of the equipment is prolonged, and the operation safety is improved.

Vibration control device (1) configured to dampen vibrations in an elongated structure, the vibration control device (1) comprising: - a support structure (2) configured to be anchored to the elongated structure, - a rotating frame (3) rotatably mounted on the support structure (2) around a first axis A1, and - a linear spring dashpot (6) comprising a first end (61) that is pivotably attached to the support structure (2) around a second axis A2 and a second end (62) pivotably attached to the rotating frame (3) around a third axis A3, wherein the rotating frame (3) comprises a mass (M) distant from said first axis A1, said linear spring dashpot (6) is configured to exert a force to bring said mass to a rest position such that the mass oscillates around the rest position about the first axis A1 when the vibration control device is biased by a vibration.

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.

A temporary damper assembly (1) for use during vertical storage and / or vertical transportation of a tower (2) is described, the damper assembly (1) comprising a liquid damper (10) tuned to the natural vibration frequency of the tower (2), a tower cover (11) realized to cover a ring-shaped upper opening (20) of the tower (2) during storage and / or transportation, a mounting interface (12) configured to suspend the liquid damper (10) from the ring-shaped upper opening (20) of the tower (2), and a load transfer interface (13) for transferring a load (F) between the liquid damper (10) and the tower (2). A method of suppressing vortex-induced vibrations in a tower (2) during vertical storage and / or vertical transportation of the tower (2) is also described.

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.

The application relates to the technical field of wind power generation, and discloses a wind turbine design method adopting a frictional tuned mass damper, which adds a frictional tuned mass damper to a man platform in a tower drum of a wind turbine, establishes a motion equation of the wind turbine after adding the frictional tuned mass damper based on a structural dynamics principle, deduces a mathematical analytic expression of a system dynamic coefficient, and obtains parameters of the frictional tuned mass damper through a system optimization theory. The application solves the problems that the prior art is difficult to realize damping through the tuned mass damper in the narrow space in the cabin or the tower drum, and the damping control effect is poor.

The invention provides a vibration damping device and an applicable reactor, the vibration damping device comprises a vibration damping plate, the vibration damping plate comprises a plurality of resonance units, each resonance unit comprises a vibration damping base plate, the vibration damping base plate of each resonance unit is connected with the vibration damping base plate of the adjacent resonance unit, each resonance unit further comprises a mass block, and the mass block is connected with the vibration damping base plate of the adjacent resonance unit. The vibration reduction substrate is provided with a first surface and a second surface which are opposite to each other, the mass block is located on the first surface and the second surface, the vibration reduction substrate comprises a flexible material, and the mass block comprises a rigid material; the vibration reduction filter screen comprises a main filter screen plate placed in the first direction and a plurality of supporting rods placed in the second direction different from the first direction, one end of each supporting rod is connected with the vibration reduction plate, and the other end of each supporting rod is connected with the main filter screen plate; the supporting rods support the main filter screen plate so that the main filter screen plate can be located on the side, away from the vibration reduction base plate, of the first mass block or the second mass block.

The present disclosure includes a jounce bumper with a main body and an insert. The main body includes a first polymeric material. The insert is integral with the main body and includes a second polymeric material that is different from the first polymeric material. The insert further includes a first plate, a second plate, and a connecting lattice that connects the first plate and the second plate together. The first polymeric material of the main body is between the first plate and the second plate, and is within the connecting lattice.

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.

This invention discloses a tuned mass damper, relating to the field of tuned mass damper technology. The tuned mass damper includes a housing, two mass modules, and a cosine beam. The two mass modules are disposed within the housing and are spaced vertically. Each mass module includes a vibration-absorbing component and multiple elastic elements disposed around its periphery. The multiple elastic elements extend laterally along the vibration-absorbing component, with one end connected to the vibration-absorbing component and the other end connected to the housing. The cosine beam is disposed between the two vibration-absorbing components, with its upper end connected to the upper vibration-absorbing component and its lower end connected to the lower vibration-absorbing component. This application achieves a wider effective vibration suppression frequency band by using two vibration-absorbing components (upper and lower) in conjunction with the cosine beam to absorb vibration. By arranging multiple elastic elements around the vibration-absorbing components, compared to tuned mass dampers that absorb vibration in a single dimension, it achieves vibration absorption in multiple dimensions, and the structure is simple and easy to replace.

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.

The invention discloses a frequency-adjustable dynamic vibration absorber, and belongs to the technical field of dynamic vibration absorbers, the frequency-adjustable dynamic vibration absorber comprises a fixed support assembly, a plate spring, a mass block, a driving assembly and a sliding clamp, and the fixed support assembly is provided with a plate spring mounting part and a driving assembly mounting part; the middle part of the plate spring is mounted on the plate spring mounting part, and two ends of the plate spring are free ends which are respectively provided with a group of mass blocks; the driving assembly is mounted on the driving assembly mounting part; the area between the middle and the free end of the plate spring is the movement area of the sliding clamps, the two sides of the plate spring are each provided with one movement area, one sliding clamp is arranged in each movement area, the sliding clamps are in sliding connection with the plate spring, and the sliding clamps are in transmission connection with the driving assembly. The vibration absorber is driven by the driving assembly to linearly move in the length direction of the plate spring, the effective working length of the plate spring is changed, the inherent frequency of the plate spring is adjusted, the inherent frequency of the vibration absorber is synchronously matched with the external excitation frequency, and the optimal vibration absorption effect is achieved.

The application relates to a space paddle type inertial device, which comprises a piston driving rod, a flywheel, a rotary damper and a space paddle type rotating shaft; the space paddle type rotating shaft comprises a spherical hinge, a bearing and a connecting rod which are sequentially connected; the flywheel and the rotary damper are connected with two ends of the connecting rod respectively, and the piston driving rod is connected with the spherical hinge; the flywheel and the rotary damper rotate around the same axis, the piston driving rod moves horizontally under the drive of the outside world, the flywheel and the rotary damper are driven to rotate by the space paddle type rotating shaft, and the translation of the piston driving rod is converted into the rotation of the flywheel and the rotary damper by the space paddle type rotating shaft. The rotation of the flywheel realizes mass amplification. The application realizes mass amplification, damping energy consumption, and has the advantages of simple mechanical form, flexible installation, easy implementation, high-efficiency vibration reduction, simple structure, low cost, convenient maintenance and high energy dissipation efficiency compared with the prior art.

A Modular Isolated Reactor Support System (MIRSS) assembly includes a cylindrical reactor support structure configured to structurally support a reactor enclosure system on seismic isolators, a collector cylinder configured to at least partially define a riser annulus between an inner cylindrical surface of the collector cylinder and an outer sidewall surface of the reactor enclosure system structurally supported by the cylindrical reactor support structure, and a divider wall configured to at least partially define a downcomer annulus between an outer cylindrical surface of the divider wall and a reactor building, and a plurality of exhaust ducts extending from the collector cylinder and through an interior of the cylindrical reactor support structure.

The application discloses a damping method of a magnetic guide rail vibration absorber, the vibration absorber comprising a support and two mutually perpendicular and fixedly connected magnetic guide rails, the bottom of the support being fixed on a motor, the upper end of the support being fixedly connected with the connecting nodes of the two magnetic guide rails, the magnetic guide rails being supported, the end of each magnetic guide rail being slidably connected with a mass block, a spring being connected between each mass block and the connecting node of the two magnetic guide rails, the spring being wound on the magnetic guide rail, the mass block being a coil wound with the magnetic guide rail as a central axis, and the two ends of the coil being connected with an electric resistor R through wires; the application has the advantages that the energy generated by vibration is consumed in the electric resistor R, thereby reducing the vibration energy of the motor and achieving a better damping effect.

The present application relates to a kind of tuned mass damper and track structure;The device includes shell and mass, the mass is located in the shell, the mass and the shell are formed with cavity between, the mass and the shell are connected by annular elastic layer, the annular elastic layer separates the first chamber and the second chamber in the cavity, the first chamber and the second chamber are filled with damping fluid in it.The mass of the present application is connected in the shell by annular elastic layer, when working, elastic layer occurs shear deformation, with single natural frequency, reliable tuned vibration absorption is realized, low-frequency vibration influence is reduced, the device is maintenance-free, and operating and maintenance cost is low;Shell can provide good strength, built-in concrete structure will not reduce the strength of concrete structure, and the range of use is wide.

The utility model relates to the technical field of vibration reduction assemblies, in particular to a damping type motorcycle vibration reduction assembly which comprises a vibration reducer body, each fixing mechanism comprises a moving groove, a base plate and a limiting block, each mounting mechanism comprises a threaded hole, a round hole and a bolt, the bolt is rotated to enable the bolt and the threaded hole to be disconnected, and the vibration reducer body is installed on the base plate. At the moment, the base plate can be moved to drive the limiting block to be disconnected from the arc-shaped threaded plate, the arc-shaped threaded plate which is not in contact with the preload adjusting ring can be transversely moved, and then the preload adjusting ring is rotated to enable the preload adjusting ring to be disconnected from the arc-shaped threaded plate which is in contact with the preload adjusting ring; at the moment, the preload adjusting ring is moved to enable the preload adjusting ring and the spring connected with the preload adjusting ring to be far away from the arc-shaped threaded plate, the arc-shaped threaded plate can be detached at the moment, and when the arc-shaped threaded plate is damaged, the arc-shaped threaded plate can be detached for maintenance or direct replacement, so that the overall loss of the vibration reduction assembly during maintenance caused by a traditional integral structure is avoided, and the service life of the vibration reduction assembly is prolonged. And the service life of the vibration reduction assembly is prolonged.

It is disclosed a floating wind turbine, comprising a mast, a nacelle and a plurality of rotating blades, the floating wind turbine being subjected to vibrations, and further comprising a vibration control system (20), characterized in that the vibration control system comprises a nonlinear energy sink (21), comprising a movable mass (210) and a coupling device (211) connecting the mass to a wall of the floating wind turbine, the coupling device having non-linear stiffness when biased in a direction perpendicular to the axis of the mast and being configured to perform non-linear viscous damping of a motion of the mass perpendicular to the axis of the mast.

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.