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Broadband tunable piezoelectric mass damper (piemdam)
InactiveEP4477915A1Vibration suppression adjustmentsShock absorbersVibration attenuationHemt circuits
The present invention relates a tunable vibration attenuation device (100) configured to be mounted to a host structure (1) for attenuating vibrations in multiple frequency ranges. The device (100) comprises an auxiliary mass (4) and a shunt piezoelectric system (8) electromechanically coupled between the host structure (1) and the auxiliary mass (4). The shunt piezoelectric system (8) comprising an array of a plurality of piezoelectric devices (2), each connected to at least one shunt circuit (3). Each piezoelectric device (2) being configured to generate electric charge in response to the relative movement of the host structure (1) and the auxiliary mass (4), wherein part of the electric charge is transmitted to at least one shunt circuit (3) of each piezoelectric device (2), and wherein the electrical characteristics of the shunt circuit (3) are adapted to control the oscillatory characteristics of the corresponding piezoelectric devices (2) in one or more vibration frequency ranges of the host structure (1) so as to tune the vibration attenuation device (100) to suppress the host structure vibrations at the desired frequency ranges.
Owner:PANEPISTIMIO PATRON +3
Synergistic reinforcement energy consumption mechanism and support arm type fan tower drum damping device with same
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.
Owner:NORTHEAST DIANLI UNIVERSITY
Adjustable quasi-zero stiffness vibration isolation device
ActiveCN222458193URealize up and down adjustmentImprove static stiffnessShock absorbersInertia effect dampersCoil springNegative stiffness
The vibration isolation device comprises a top plate and a bottom plate, a first upper connecting rod and a second upper connecting rod are hinged to the lower side of the top plate through first cylindrical pins, and a first lower connecting rod and a second lower connecting rod are hinged to the upper side of the bottom plate through second cylindrical pins. The first lower connecting rod is hinged to the first upper connecting rod through a third cylindrical pin, the second lower connecting rod is hinged to the second upper connecting rod through a third cylindrical pin, the nonlinear vibration isolation effect of high static rigidity and low dynamic rigidity can be achieved, positive rigidity is provided by the torsion spring, negative rigidity is provided by the spiral spring, and vibration isolation is achieved. The spiral spring obtains pre-tightening force by rotating the force adjusting piece, and vertical adjustment in the platform period is achieved.
Owner:ZHEJIANG UNIV OF TECH
Rebound composite electromagnetic energy dissipation device for reducing sloshing with liquid-filled ball for large liquefied natural gas (LNG) storage tank
ActiveUS20250129897A1Container filling methodsNon-rotating vibration suppressionBall screwGas spring
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.
Owner:GUANGXI UNIV +1
Three-way composite vibrator dynamic vibration absorber and vibration absorbing method
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.
Owner:SHAANXI SCI TECH UNIV
Bonding head driving device and bonding device
ActiveCN222479334Ureduce vibrationImprove bonding accuracyInertia force compensationNon-rotating vibration suppressionControl theoryFour-slide
Owner:WUXI AUTOVEC SEMICON TECH CO LTD
Electrical machine that is elastically secured to a frame construction
ActiveUS12203524B2Non-rotating vibration suppressionShock absorbersElectric machineStructural engineering
A machine assembly includes a load machine secured to a frame construction. An electrical machine is coupled to the load machine and drives the load machine. The electrical machine is secured to the frame construction via multiple intermediate elements. Frame-side main parts of the intermediate elements are secured to the frame construction and machine-side main parts of the intermediate elements are secured to the electric machine. Spring assemblies are respectively arranged between the machine-side main parts and the frame-side main parts for transferring a weight force of the electric machine from the machine-side main parts to the frame-side main parts.
Owner:INNOMOTICS GMBH
Vibration control systems
ActiveUS12449014B2Non-rotating vibration suppressionSprings/dampers functional characteristicsControl systemMechanical engineering
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.
Owner:BAE SYSTEMS PLC
Damping-controllable low-impact inerter vibration reduction device and control method
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.
Owner:XIANGTAN UNIV
Local resonance type photonic crystal primitive cell
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.
Owner:LANZHOU JIAOTONG UNIV
Vibration Absorber Arrangement
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.
Owner:WOLFEL ENG GMBH CO KG
Micro-power active shock absorber
PendingCN119122993Acounteract vibrationTo achieve the effect of vibration reductionNon-rotating vibration suppressionShock absorbersVibration amplitudeMachine
The invention discloses a micro-power active shock absorber, and belongs to the technical field related to shock absorption. Comprising a vibration exciter, a signal processor and a sensor. The vibration exciter is arranged on the machine body through a spring in a suspension manner; the machine body is mounted on equipment to be damped; the vibration exciter is a single-degree-of-freedom vibration system; the sensor obtains the vibration frequency, the phase and the amplitude of the vibration-damped equipment; the signal processor acquires a signal of the sensor and controls the vibration exciter to vibrate; the vibration generated by the vibration exciter and the vibration of the vibration-damped equipment are the same in frequency and opposite in phase. According to the micro-power active shock absorber, the micro-power driver is adopted, vibration of the vibration guide block is accurately controlled, a vibration exciter is excited to resonate, large vibration force is generated to counteract vibration of equipment subjected to shock absorption, and therefore the shock absorption effect is achieved.
Owner:长沙湘牛实业有限公司
Active damping system
PendingCN119900787ANon-rotating vibration suppressionInertia effect dampersMechanical engineeringPhysics
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.
Owner:PARCAN LAB CO LTD
Dynamic vibration absorber with soft limiting function
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.
Owner:JIANXIN ZHAO TECH CO LTD
Sleeve-shaped tuned mass damper mounting method based on parameter design calculation
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.
Owner:CHONGQING UNIV
Line spectrum damping device and method based on dynamic anti-resonance
ActiveCN119289018ARealize automatic adjustmentImprove the vibration isolation effectShock absorbersInertia effect dampersInertial massNegative stiffness
The invention provides a line spectrum damping device and method based on dynamic anti-resonance, the line spectrum damping device comprises a main mass block, a positive stiffness spring, a base, an inertial element and a self-adjusting element, the upper end and the lower end of the positive stiffness spring are fixed between the main mass block and the base respectively, and the inertial element comprises a lever and an inertial mass block; the lever is movably clamped and positioned through a flexible hinge mechanism fixed on the main mass block and the base, the inertia mass block is fixed at one end of the lever and is connected with the base through a negative stiffness mechanism, the self-adjusting element is fixed on the base, and two fulcrums are arranged at the top end of the self-adjusting element and are respectively contacted with the lever; the lever ratio of the damping device can be adjusted in real time according to the excitation frequency, automatic adjustment of the vibration isolation frequency is achieved, the vibration isolation effect is enhanced, and meanwhile the weight is reduced.
Owner:CHINA SHIP DEV & DESIGN CENT
Self-adaptive tuning inerter damping device and method for suppressing vertical micro-vibration of structure
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.
Owner:SHANGHAI RESEARCH INSTITUTE OF BUILDING SCIENCES CO LTD
Adjustable collision acoustics black hole period vibration reduction and impact resistance device
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.
Owner:TIANJIN UNIV
Quasi-zero stiffness electromagnetic-spring-rubber composite vibration isolator with wide vibration isolation frequency band
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.
Owner:ZHEJIANG UNIV OF TECH
Integrated cable packaging, deployment and strumming mitigation system
ActiveUS20250145355A1Seismic signal receiversSeismology for water-covered areasStructural engineeringMechanical engineering
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.
Owner:RAYTHEON CO
Quasi-zero stiffness metamaterial sandwich structure, vibration isolation device and manufacturing method
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.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Integrated active suspension
PendingCN119858411ANon-rotating vibration suppressionResilient suspensionsElectric machineLinear motor
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.
Owner:ZHONG KE QING BANG KE JI (AN HUI) YOU XIAN GONG SI
Three-dimensional unit cell type vibration absorber for inhibiting variable flutter during milling of robot and design method of three-dimensional unit cell type vibration absorber
ActiveCN119664834Areasonable designSustainable transportationSpringsVibration controlMagnetorheological elastomer
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.
Owner:HUAZHONG UNIV OF SCI & TECH
Wind turbine having eigenfrequency modifier
It is provided a wind turbine having a modified eigenfrequency, the wind turbine having a tower including a first tower flange arranged at an upper end portion of a top part of the tower; and, an eigenfrequency modifier including a plurality of weights suspended from the first tower flange by a plurality of rigid supports. It is further provided a method of modifying an eigenfrequency of a wind turbine, the method including modifying the eigenfrequency of the wind turbine by suspending a plurality of weights from a first tower flange arranged at an upper end portion of a top part of a tower of the wind turbine using a plurality of rigid supports.
Owner:GENERAL ELECTRIC RENOVABLES ESPANA SL
Electromagnetic actuator
An electromagnetic actuator including: a mover; a stator; at least one coil provided to the stator and arranged on an outer periphery of the mover, the coil being configured to be energized to generate an electromagnetic force that exerts a driving force on the mover; at least one yoke member surrounding the coil, the yoke member being constituted by a plurality of yoke segments; and a mold resin filling a space between the yoke segments and the coil, the mold resin fixing the yoke segments to each other. The mold resin extends to an outer peripheral surface of the yoke member and forms an outside resin layer.
Owner:SUMITOMO RIKO CO LTD
Composite buffer type shock absorber
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.
Owner:YANCHENG MEIHUAN SHOCK ABSORBER MFG CO LTD
Nonlinear gear rack type inerter damper and using method thereof
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.
Owner:GUANGZHOU UNIVERSITY
Composite damping device for vibration reduction of tower drum and blades of offshore wind turbine
PendingCN121162646ARotating vibration suppressionInertia force compensationVibration controlCoupling
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.
Owner:QINGDAO UNIV OF TECH
Vibration dampening engine mount and modular vibration dampening engine mount system
A vibration dampening engine mount configured to mount an engine to a vehicle frame includes: a first bolt receiver having a first through hole configured to receive a first bolt; a second bolt receiver having a second through hole configured to receive a second bolt; and a mass damper connector integrally connecting the first bolt receiver and the second bolt receiver, wherein the vibration dampening engine mount has a predetermined mass.
Owner:NISSAN MOTOR CO LTD
Precise equipment vibration reduction supporting structure based on elastic metamaterial
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.
Owner:QIQIHAR UNIVERSITY