372results about "Inertia effect dampers" patented technology

The invention discloses a collaborative enhancement energy consumption mechanism and a support arm type fan tower drum damping device with the collaborative enhancement energy consumption mechanism, and relates to the technical field of engineering structure vibration, the collaborative enhancement energy consumption mechanism comprises a liquid column lever assembly and a plurality of inerter damping units symmetrically installed at the end of the liquid column lever assembly, and each inerter damping unit comprises a shell; the hydraulic damper and the linear-rotation converter are sequentially and axially installed in the shell from top to bottom, when the liquid column inclines, the first connecting plate is driven to drive the piston rod to stretch out and draw back, the piston rod drives the flywheel to rotate through the linear-rotation converter, and therefore vibration energy is transmitted to a fixed foundation structure through the second connecting plate to be dissipated; the invention further discloses a supporting arm type fan tower drum vibration reduction device, displacement of the vibration transmission part is transmitted to the liquid column lever through the connecting piece, the inerter damping unit is driven to stretch out and draw back, a complete energy consumption chain of the tower drum, the vibration transmission part, the connecting piece, the liquid column, the inerter damping unit and the ground is formed, and it is guaranteed that energy is stably transmitted to a fixed foundation structure.

The present invention relates to a rebound composite electromagnetic energy dissipation device for reducing sloshing with a liquid-filled ball for a large liquefied natural gas (LNG) storage tank. When the liquid surface sloshes around, the gas spring is pulled by the steel strand to produce vertical displacement and provide a restoring force, and the vertical displacement of the gas spring drives the fan blades on the sleeves of the ball screws at the bottom to rotate in the damping fluid, consuming energy. The present invention uses hydraulic transmission instead of mechanical transmission of traditional piston motion, and the horizontal pistons produce horizontal displacement in the case of pressure unbalance, thus increasing the flexibility of horizontal piston motion; magnets are arranged in the horizontal slideways and the horizontal pistons to intensify the motion of the horizontal pistons and the relative motion between the horizontal pistons and the interior.

The invention relates to the field of machinery, in particular to a three-way composite vibrator dynamic vibration absorber and a vibration absorbing method. The three-way composite vibrator dynamic vibration absorber comprises an elastic support, the elastic support comprises an elastic support base, and the elastic support base is provided with a fixing hole. The elastic support base is further connected with four free ends, and free end foundation plates are arranged at the four free ends. Mounting holes are formed in the free end foundation plate; the nonlinear oscillator A, the nonlinear oscillator B and the linear oscillator C are combined together to form a special composite oscillator; the vibration absorber has the beneficial effects that dynamic vibration absorption and vibration and noise reduction can be realized in three mutually orthogonal directions, the vibration absorber can normally work in weightlessness, severe and complex environments, can simultaneously adapt to external excitation with different intensities and multiple angles, has a relatively wide matching frequency, can effectively absorb vibration energy of a power device or a mechanical structure, and has a good application prospect. And vibration and noise generated thereby are suppressed.

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.

The invention discloses a damping-controllable low-impact inerter vibration reduction device and a control method, the damping-controllable low-impact inerter vibration reduction device comprises a low-impact inerter, a shell, a ball screw device and a controllable electromagnetic damper, the sudden change working condition of instantaneous reversing of a traditional inerter often induces obvious impact, and then the vibration reduction performance is deteriorated. Therefore, the invention provides the double-flywheel inerter structure with different rotating directions, and the double flywheels work independently, so that the problem that large impact is generated due to sudden change of reversing is effectively solved. Besides, the controllable electromagnetic damper and the low-impact inerter are integrally designed, the inerter overcomes the defect that the damper cannot change the inherent frequency of a system and can provide large inerter, a control method is provided, the controllable electromagnetic damper can be adjusted to output expected electromagnetic damping force according to the needed ideal torque, and the electromagnetic damping force can be adjusted to be larger than that of the low-impact inerter. Therefore, the vibration damping device can obtain more excellent vibration damping performance.

The utility model provides a local resonance type phononic crystal primitive cell which comprises a silicon rubber base body serving as an outer ring, a steel scatterer is arranged in an inner cavity of the silicon rubber base body, and the steel scatterer and the silicon rubber base body are connected and fixed through a soft material wrapping layer. The four spring mass subsystems are nested in the steel scattering body; a soft material wrapping layer is arranged on the side wall of the inner cavity of the silicone rubber base body. According to the utility model, a plurality of complete and directional band gaps in a low-frequency range can be effectively formed, and low-frequency elastic waves are effectively inhibited; the hollow and height difference design is adopted among the external silicon rubber base body, the steel scatterer and the spring mass subsystem, so that the vibration damping material has a sufficient deformation space to play a vibration damping role; the steel scatterer, the spring mass subsystem and other structures ensure that the anti-vibration pad has an enough supporting effect, band gap regulation and control of the local resonance type photonic crystal can be effectively achieved through material selection flexibility, and low-frequency vibration control of different frequency bands is achieved.

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 discloses an active vibration reduction system. The active vibration reduction system comprises a lower device, and the lower device comprises a base, a base table located above the base and a lower displacement device for driving the base table to move relative to the base; one side of the base away from the base is provided with a first reference surface; a scanning probe of the probe distance sensing device is located above the first reference surface, and the probe distance sensing device is used for detecting the distance between the first reference surface and the scanning probe; and the main control module is electrically connected with the lower displacement device and the probe distance sensing device, and the main control module controls the lower displacement device to drive the base table to move relative to the base according to the distance between the first reference surface and the scanning probe measured by the scanning probe. Compared with the prior art, the active vibration reduction system is better in vibration reduction effect.

The utility model discloses a dynamic vibration absorber with a soft limiting function. The dynamic vibration absorber comprises a mass block, a shell, a rubber part and a bandage. The two ends of the mass block are fixed to the shell through arranged rubber parts, and the mass block and the shell are fixed through additionally-arranged bandages. The dynamic vibration absorber with the soft limiting function is simple in structure, reasonable in design and convenient to assemble.

The invention discloses a sleeve-shaped tuned mass damper mounting method based on parameter design calculation. The sleeve-shaped tuned mass damper mounting method comprises the following steps that S1, parameters of a single-column wind turbine platform and a whole machine structure are calculated; s2, calculating parameters of the sleeve-shaped tuned mass damper according to the structural parameters of the wind turbine; s3, the sleeve-shaped tuned mass damper is installed on the single-column type wind turbine platform; in the step S2, a kinetic equation is established through a kinetic analysis model, the optimal damping coefficient cd and the distance d of the translational and rotational freedom degrees are solved, and the step S2 comprises the substeps that S21, the single-column wind turbine platform and the sleeve-shaped tuned mass damper are simplified into equivalent four-freedom-degree models; s22, assuming that external excitation is a simple harmonic load, and deducing translation response and rotation response of the sleeve-shaped mass body and the single-column type wind turbine platform; s23, determining a damping tuning parameter and a frequency tuning parameter; s24, solving an optimal damping coefficient copt by a simultaneous equation in combination with a branch resonance point condition; and S25, calculating the distance d according to the rotation radius ratio rho.

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 discloses an adjustable collision acoustics black hole period vibration reduction and impact resistance device which comprises a plurality of same vibration reduction and impact resistance units periodically arranged on the surface of a structure subjected to vibration reduction. The vibration reduction and impact resistance unit comprises an n-shaped cavity wall and a mass block-acoustic black hole beam combined structure arranged in the n-shaped cavity wall. The adjustable collision acoustics black hole period vibration reduction and impact resistance device has periodicity in the n-shaped direction perpendicular to the n-shaped cavity wall. The n-shaped cavity wall comprises an upper cavity and a top vent hole formed in the top end of the upper cavity; the mass block-acoustic black hole beam combined structure comprises an acoustic black hole beam, a mass block and a containing cavity perpendicular to the structure to be damped. Damping layers are arranged at the tail ends of the acoustic black hole beams, and the mass block moves up and down in the containing cavity and collides with the acoustic black hole beams arranged below to transmit vibration energy which is absorbed and dissipated by the damping layers. By periodically arranging the vibration reduction and impact resistance units on the surface of the structure subjected to vibration reduction, the broadband vibration reduction effect is achieved.

The invention discloses a quasi-zero stiffness electromagnetic-spring-rubber composite vibration isolator with a wide vibration isolation frequency band. The quasi-zero stiffness electromagnetic-spring-rubber composite vibration isolator comprises a vibration isolator shell. The electromagnetic structure core is installed in the vibration isolator shell and comprises a first coil, an annular permanent magnet, a third coil and a second coil which are sequentially arranged from top to bottom, the current direction of the first coil is the same as that of the second coil, and the current direction of the third coil is opposite to that of the second coil; the rubber-spring composite vibration isolation platform is mounted in the vibration isolator shell, and the rubber-spring composite vibration isolation platform is mounted in the vibration isolator shell; high linear positive stiffness provided for the rubber-spring composite vibration isolation platform through an electromagnetic structure core is combined with linear negative stiffness provided for the rubber-spring composite vibration isolation platform, a quasi-zero-stiffness platform with small stiffness and large range is achieved, low-frequency vibration with large amplitude can be isolated, the rubber vibration isolation platform is combined, and the vibration isolation performance of the rubber-spring composite vibration isolation platform is improved. And vibration isolation of a wide vibration isolation frequency band is realized.

A cable package for a line array and a method thereof including a first sheet of material, a cable wound in a serpentine shape, where a portion of the cable contacts the first sheet of material, and a second sheet of material attached to the cable and areas of the first sheet of material not occupied by the cable, wherein the areas of the second sheet of material attached to the first sheet of material not occupied by the cable comprises scoring lines to enable separation under tension to form a plurality of strumming mitigation fairings, and wherein the cable with scoring lines in the areas of the second sheet of material attached to the first sheet of material not occupied by the cable is folded onto itself.

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.

The integrated active suspension comprises a linear motor assembly and a magneto-rheological damper assembly, the magneto-rheological damper assembly is arranged on the central axis of the linear motor assembly, an end cover is arranged on the upper portion of the magneto-rheological damper assembly, the end cover is sleeved with a spring tower, a spring tray is arranged at the top of a rotor of the linear motor assembly, and the spring tray is arranged on the top of the rotor of the linear motor assembly. A tower-shaped spring is arranged between the spring tray and the spring tower, the bottom of a rotor of the linear motor assembly is fixedly connected with a rotor lower end cover, a fork arm connecting piece is arranged on the bottom face of the rotor lower end cover, and the bottom face of the fork arm connecting piece is fixedly connected with the movable end of the magnetorheological damper assembly. The magneto-rheological damper assembly can achieve a great damping coefficient with extremely low power consumption, and the linear motor assembly needs to provide extremely small force or does not need to work, so that the integrated active suspension is low in cost and energy consumption and has wider market application potential.

The invention belongs to the technical field of robot milling vibration control, and particularly relates to a three-dimensional unit cell type vibration absorber for restraining variable flutter during robot milling and a design method of the three-dimensional unit cell type vibration absorber. The vibration absorber comprises a plurality of magnetic conductive balls, a plurality of magnetorheological elastomers, a magnetic conductive block, an electromagnetic coil, an upper wall, a lower wall and four side walls. The upper wall, the lower wall and the four side walls form a cubic structure, the electromagnetic coil sleeves the outer walls of the four side walls, and the magnetic conductive block sleeves the outer wall of the electromagnetic coil and is connected with the upper wall and the lower wall; the three-dimensional unit cell type vibration absorber is of a central symmetry structure. The plurality of magnetic conductive balls are arranged in the cubic structure according to the form of the body-centered cubic structure, the inner wall of the cubic structure is connected with the magnetic conductive balls, and the magnetic conductive ball located at the body center is connected with the magnetic conductive balls located at the eight vertex angles through the magnetorheological elastomer. The whole structure has three-dimensional symmetry, so that the structure can still keep stable under any rotating posture of the robot, modals of different directions and frequencies of the robot can be restrained, and the restraining effect is good.

The invention is suitable for the technical field of shock insulation equipment, and provides a composite buffer type shock absorber which comprises an upper fixing seat, a lower fixing seat, an elastic shock insulation unit and a plurality of transverse limiting buffers, the elastic shock insulation unit is arranged between the upper fixing seat and the lower fixing seat, the two ends of the elastic shock insulation unit abut against the friction faces of the fixing seats through sliding friction blocks, and the transverse shock absorption function is provided through sliding friction energy consumption. The four transverse limiting buffers which are arranged in an annular array mode are connected with the upper fixing base and the lower fixing base, the transverse reset capacity is enhanced and the displacement amount is limited through the elastic stretching and retracting of buffer springs and the synergistic effect of damping liquid, and the friction blocks are prevented from being disengaged; the multi-directional vibration reduction performance is further optimized, the vertical vibration isolation function and the transverse limiting function are achieved, and the problem that due to too large transverse deviation of a traditional vibration reducer, an elastic unit is torn is effectively solved.

The invention provides a nonlinear gear and rack type inerter damper and a using method thereof. The nonlinear gear and rack type inerter damper comprises a transmission assembly, an inerter synergistic assembly and an energy dissipation and shock absorption assembly. The transmission assembly comprises a box body, a rack and a gear mechanical group, a rack support for the rack to slide is arranged on the box body, and the rack is in meshed connection with the gear mechanical group; the inerter synergy assembly is fixed to a transmission shaft of the last stage of gear of the gear mechanical set, and the energy dissipation and shock absorption assembly is fixed to the box body and located below the inerter synergy assembly. According to the transmission assembly, external horizontal movement is converted into rotating movement of a gear and rack system of the device, the transmission ratio is increased, the mechanical efficiency is high, and energy loss can be effectively reduced; a mass block of the inerter synergistic assembly is connected with a flywheel through a spring and a threaded rod, nonlinear adjustment of the inerter can be achieved by changing the rigidity of the spring, magnets of different poles of the energy dissipation and shock absorption assembly are distributed in a staggered mode, and a closed magnetic circuit is provided for the inerter synergistic assembly.

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 semi-active inerter nonlinear energy trap of the wind power tower comprises a mass spring system, an inerter system, an eddy current damping system and a supporting system, a sliding rail in the mass spring system is horizontally fixed to a bottom plate of the supporting system, and transmission teeth of a mass block in the mass spring system are meshed with a first gear in the inerter system; an inertia flywheel in the inerter system connects a circular ring connector with a conductor cylinder in the eddy current damping system through bolts, and three transmission shafts in the inerter system are fixed to a bottom plate in the supporting system through deep groove bearings and rolling bearings. The mass spring system, the inerter system, the eddy current damping system and the supporting system are distributed in the vertical direction, heat energy generated during eddy current damping energy consumption is conveniently dissipated, and the problem of internal heat accumulation is avoided.

The invention provides a method and device for determining the pre-pressing amount of an elastic system, the elastic system and a suspension assembly, the elastic system comprises one or more elastic elements, and the method comprises the steps that the pre-loading force of each elastic element in the one or more elastic elements is determined; based on the preloading force of each elastic element, the prepressing amount of each elastic element is determined; wherein the preloading force and / or the prepressing amount enable an assembly connected to the one or more elastic elements to be in a static balance state, and the total prepressing amount, corresponding to the preloading force, of the one or more elastic elements is minimum. According to the method for determining the preloading amount of the elastic system, the accuracy of the preloading force is remarkably improved, meanwhile, the calculation process of the preloading force of the elastic system is simplified, and the skill threshold of operators is reduced.

The invention relates to a vibration damping and buffering protection superstructure based on local resonance and compression-torsion coupling. The vibration damping and buffering protection superstructure comprises a middle circular ring and two compression-torsion pipes, wherein the two compression-torsion pipes are symmetrically arranged with the middle circular ring as the center in a chiral mode. Each pressure torsion pipe comprises an outer circular ring and a connecting rod; the outer circular ring and the middle circular ring are coaxially arranged; two ends of the connecting rod are respectively connected to the middle circular ring and the outer circular ring; the plurality of connecting rods are uniformly arranged along the middle circular ring; and a resonance ball is arranged on each connecting rod in a penetrating manner. When vibration or impact invasion occurs, the superstructure generates a local resonance effect and a compression-torsion coupling mechanism, and the wave energy dissipation efficiency is better and more stable. Through the chiral symmetric pressure torsion tube, coupling of longitudinal and torsional deformation modes is realized, and polarization of longitudinal waves and torsional waves is promoted. Therefore, the polarized band gap can be induced to block longitudinal waves. Meanwhile, the resonance balls on the connecting rods generate a remarkable local resonance effect, and wave energy is dissipated through local resonance. According to the invention, impact protection and vibration isolation performance can be synergistically improved.

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.