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38results about How to "Vibration suppression effect is obvious" patented technology
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External stay cable type damping device
ActiveCN103469728AImprove energy efficiencyNo motion gapBridge structural detailsEngineeringBox girder
The invention discloses an external stay cable type damping device. The device comprises a stay cable, a cable hoop, bolt connecting pieces, dampers, an upper bracket, a pipe hoop, a supporting frame, a diagonal bracing pipe and a box girder top surface, wherein the cable hoop is fixedly sleeved on a stay cable PE (Polyethylene) external protecting pipe through the bolt connecting pieces; two single earrings are arranged on one side of the cable hoop close to the dampers; the single earrings of the cable hoop are connected with one ends of the dampers through pin shafts; the other ends of the dampers are connected with double earrings on the end part of the upper bracket through the pin shafts; the two dampers are symmetrically distributed to form an isosceles triangle with the upper bracket; the dampers are perpendicular to the central line of the stay cable; the middle part of the upper bracket is movably sleeved in the pipe hoop through the bolt connecting pieces of the pipe hoop; the pipe hoop is welded at the top end of the supporting frame; the diagonal bracing pipe is fixedly connected to the upper part of the supporting frame through the pin shaft; the bottom end of the diagonal bracing pipe, the bottom end of the supporting frame and the box girder top surface are fixedly welded to form a triangular supporting structure. The device has the advantages of simple structure and convenience in mounting and is suitable for stay cables of all angles.
Owner:WUXI HONGGU ZHENKONG TECH CO LTD
Fault diagnosis and feedback system according to third octave flutter of high-speed cold rolling mill
InactiveCN103521531AReduce vibrationEliminate self-excited vibrationRoll mill control devicesMeasuring devicesAutomatic controlData stream
The invention discloses a fault diagnosis and feedback system according to third octave flutter of a high-speed cold rolling mill, and relates to the field of sensing signals of the rolling mill and computer automatic control engineering. The fault diagnosis and feedback system is mainly composed of a rolling mill signal acquisition unit, a computer diagnosis control unit, a rolling mill vibration abatement execution unit and an off-line model adjustment unit. The fault diagnosis and feedback system is mainly characterized in that according to the principles and characteristics of the third octave flutter of the rolling mill, acquired signals are guided into the computer diagnosis control unit, sorted and analyzed, then, a vibration control module generates vibration abatement signals, the vibration abatement signals are output to the vibration abatement execution unit so that the rolling mill can be adjusted in terms of a plate tension relaxation device and a main transmission speed and the vibrating energy of the rolling mill is lowered, and then self-excited vibration of the rolling mill is eliminated; meanwhile, acquired control data streams are transmitted to a computer of the off-line model adjustment unit, and an expert system is used for off-line fault diagnosis and analysis to improve fault diagnosis and a control algorithm.
Owner:TIANJIN UNIVERSITY OF TECHNOLOGY
Active inhibition device and method for band-saw blade vibration on the basis of master vibration modal prediction
InactiveCN103447617AHigh control precisionReal-time display of vibration amplitudeMetal sawing accessoriesMeasurement/indication equipmentsVibration amplitudeEngineering
The invention discloses an active inhibition device and method for band-saw blade vibration on the basis of master vibration modal prediction. The device is used for real-time sampling, analysis and eigenvalue extraction for transverse, longitudinal and torsion-directional multi-dimensional vibration of a band-saw blade, is used for master vibration modal prediction on the basis of real-time vibration characteristics of the band-saw blade, and is specially designed for high-speed response on the basis of band-saw blade master vibration modal recognition and prediction feedback. The device is capable of displaying vibration amplitude of the band-saw blade in real time, is applicable to all band saws each having an oil source, and is capable of significantly inhibiting the vibration of the band saw.
Owner:HANGZHOU DIANZI UNIV
Nonlinear energy sink with segmented linear beams applied to rotor system
InactiveCN110230661AReasonable designSimple structureRotating vibration suppressionEngineeringFrequency band
The nonlinear energy sink (NES) with segmented linear beams applied to a rotor system. The nonlinear energy sink comprises a NES frame, a plurality of steel plate springs and a plurality of mass blocks, wherein one ends of the steel plate spring are connected with the NES frame, the other end of each steel plate springs is connected with a corresponding mass block, and the plurality of steel platesprings are uniformly arranged. According to the nonlinear energy sink, segmented linear stiffness beams are equivalently used for replacing cubic stiffness beams, the fitting precision of the nonlinear energy sink to the cube stiffness is high, the change of the segmented linear stiffness is related to the vibration displacement of a system, and by changing gaps between the segmented linear beams and the mass blocks, the non-linearity of the nonlinear energy sink can be effectively changed; and the energy of the system needing to be subjected to vibration reducing is transferred to the outside of the system for consumption through the nonlinear energy sink, the structure is simple and compact, the design is reasonable, the vibration suppression frequency band is wide, and the vibration suppression effect is remarkable.
Owner:NORTHEASTERN UNIV
Piezoelectric active and passive mixed vibration suppression method for automobile body structure
InactiveCN103042940AVibration suppression effect is obviousImprove controllabilityAuxillary drivesElectric propulsionEngineeringEnergy expenditure
The invention relates to a piezoelectric active and passive mixed vibration suppression method for an automobile body structure and belongs to a structure vibration control method. Direct and inverse piezoelectric effects of piezoelectric materials are used, vibration of wallboards of the automobile body is sensed and controlled through one or more piezoelectric elements distributed on surfaces of the wallboards of the automobile body, and the active and passive mixed control on the vibration of the automobile structure is achieved through combining a control algorithm. According to the method, advantages of small added mass, wide bands and good controllability of the active vibration technology and good reliability, stability and robustness and little energy consumption of the passive damping control technology are comprehensively used, and the effective suppression of the vibration of the automobile body structure is achieved with small system added mass and little energy input.
Owner:JILIN UNIV
Adjustable and portable dynamic vibration absorber and operation method thereof
InactiveCN111365399ASimple structureEasy to disassembleSpringsSprings/dampers functional characteristicsVibration absorptionDynamic Vibration Absorber
The invention discloses an adjustable and portable dynamic vibration absorber and an operation method thereof. The dynamic vibration absorber comprises a mounting base, a spring piece, and two mass blocks, wherein the mounting base is used as a supporting structure of the adjustable and portable dynamic vibration absorber, and used as a structure for connecting the adjustable and portable dynamicvibration absorber with the outside; the spring piece is mounted on the mounting base; the two ends of the spring piece are located on the two sides of the mounting base; the two mass blocks are bothmovably mounted on the spring piece, and the two mass blocks are located on the two sides of the mounting base; the two mass blocks move on the spring piece so that the vibration suppression characteristic of the dynamic vibration absorber can be adjusted; and a sandwich damping layer and a restraint layer are sequentially arranged on the upper side surface of the spring piece and used for achieving the adjustment of the damping characteristic of the dynamic vibration absorber. The dynamic vibration absorber has the advantages that multiple vibration absorption frequency bands are achieved, the structure is simple, and the disassembly and the assembly are convenient.
Owner:XIAN POWER TRANSMISSION & TRANSFORMATION PROJECT ENVIRONMENTAL IMPACT CONTROL TECHN CENT CO LTD +1
Multiple-consumption self-adaptive collision type tuned massed damper
ActiveCN110528948AGood inhibitory effectReduce the burden onProtective buildings/sheltersShock proofingPeripheralElastic component
The invention relates to a multiple-consumption self-adaptive collision type tuned massed damper. The damper comprises a peripheral protection unit, a vertical vibration unit, a collision gap self-coordination unit and a suspension tuned massed damping unit, wherein the vertical vibration unit is fixedly arranged at the upper end of the peripheral protection unit; the collision gap self-coordination unit is arranged in an accommodating cavity, and the upper portion of the collision gap self-coordination unit is provided with a collision cavity; and the suspension tuned massed damping unit comprises an outer massed ball, an inner massed ball and a plurality of collision energy consumption heads, a spherical cavity is formed in the center of the outer massed ball, the outer massed ball is arranged in the collision cavity, and the upper end of the outer massed ball is connected to the vertical vibration unit through a connecting component; and the inner massed ball is suspended in the spherical cavity of the outer massed ball through elastic components. The multiple-consumption self-adaptive collision type tuned massed damper has the characteristics of multiple collision nonlinear energy consumption and excitation strength adaption, a high-rise building structure dynamic response suppression effect under an earthquake and wind load effect is remarkable, and the multiple-consumption adaptive collision type tuned massed damper is applicable to structures with limited spaces, is remarkable in vibration suppression effect and good in economic and social benefit.
Owner:TONGJI UNIV
Simulation test device for suppressing vibration of ejector support plate and vibration suppression method
ActiveCN113295359AGood stabilityVibration suppression effect is obviousNon-rotating vibration suppressionVibration testingPhysicsThree dimensional model
The invention provides a simulation test device for suppressing vibration of an ejector support plate and a vibration suppression method. The simulation test device comprises a laser doppler velocimeter, a signal generator, a vibration excitation mechanism, a vibration suppression mechanism and a laser probe. The device can test and verify the actual vibration suppression effect of the vibration suppression method. Meanwhile, the invention provides a method for restraining vibration of the supporting plate, the method adopts finite element analysis of a three-dimensional model of the ejector to be combined with field measured data, the main vibration concentration position of the ejector is determined, piezoelectric fiber pieces are arranged at the main vibration concentration position to serve as a sensor and an actuator, an active oscillation piezoelectric control method or an active damping control method is cooperatively selected to control the actuator, vibration suppression can be carried out on a single frequency or a whole frequency band, and good stability and a remarkable vibration suppression effect are achieved.
Owner:中国空气动力研究与发展中心设备设计与测试技术研究所
Attached mounting type miniature compound dynamic vibration absorber
The invention relates to an attached mounting type miniature compound dynamic vibration absorber and belongs to the technical field of noise vibration control. The attached mounting type miniature compound dynamic vibration absorber comprises an elastic base, assembling supports, elastic films, a mass block and connecting pieces for assembly of the compound dynamic vibration absorber. The elastic base and the two assembling supports form a body of the compound dynamic vibration absorber. The elastic base is of a rubber type cylinder structure. The two assembling supports are arranged and are each of a metal-pipe-shaped structure with a certain height. One of the assembling supports is connected with the elastic base through the connecting pieces. The elastic films and the mass block form vibration absorbing elements of the dynamic vibration absorber, the two vibration absorbing elements are arranged, one of the vibration absorbing elements is located between the two assembling supports and is connected with the two assembling supports through the elastic films, and the other vibration absorbing element is located at the top end of the dynamic vibration absorber and is connected with the assembling supports through the connecting pieces. By the adoption of the attached mounting type miniature compound dynamic vibration absorber, the low frequency and broadband vibration suppression and noise reduction can be achieved, and the vibration suppression and noise reduction performance can be further enhanced when mounting dynamic vibration absorbers are distributed periodically.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Active vibration control system and method of flexible structure based on voice coil motor
ActiveCN104074904AGet the most out of performanceAchieving Active Vibration ControlShock absorbersControl systemEngineering
The invention discloses an active vibration control system of a flexible structure based on a voice coil motor and a method thereof, wherein the system comprises a main support rod fixed on the ground, a rail is fixed on the main support rod, left and right oblique rods on both sides of the rail are symmetrically fixed to the main support rod, left and right large displacement actuators adjacent to the left and right oblique rods are fixed on both sides of the main support rod when the rail is as a symmetry axis, both sides of the other end of the rail are symmetrically fixed with stationary fixtures on which fixed pulleys are mounted, and the top of the rail is provided with the flexible structure; the other ends of the left and right oblique rods are connected with positioning fixtures on which hole bolts are mounted, the fixed pulleys, the hole positions of the hole bolts and the left and right oblique rods are located on the same plane, and a rigid rope passes through the left large displacement actuator, the fixed pulleys and the holes of the hole bolts; besides, the invention further discloses a control method of the system; the active vibration control system outputs large displacement and greater control force through the voice coil motor, a control direction is shifted by the pulleys such that the active modal vibration control of the flexible structure can be realized.
Owner:XI AN JIAOTONG UNIV
Nonlinear vibration absorber with multi-stable-state rigidity
ActiveCN109139793AReasonable designSimple structureRotating vibration suppressionVibration dampersStable stateEngineering
The invention discloses a nonlinear vibration absorber with multi-stable-state rigidity. A shaft sleeve is fixedly connected to a rotation shaft. An inner magnet is arranged between two outer magnets.One ends of connecting rods are inserted in small circular holes, and the other ends of the connecting rods are fixedly connected with the shaft sleeve. One ends of segmented linear rods are fixedlyconnected with the shaft sleeve, the other ends of the segmented linear rods are arranged in large circular holes, and certain gaps are kept between the other ends and the large circular holes. One ends of pre-tightening rods are fixedly connected with the shaft sleeve, the other ends of the pre-tightening rods make contact with one radial inner surfaces of square holes, and accordingly pre-tightening force is provided. Poles of the two outer magnets are repulsive to poles of the opposite inner magnet, and the distances between the two outer magnets and the inner magnet are the same. Accordingto the provided nonlinear vibration absorber with multi-stable-state rigidity, the segmented linear rigidity is generated through contact of the segmented linear rods and the opposite gaps on an inner magnet supporting disc, and in addition, rigidity can be reduced; and negative rigidity is achieved through annular magnets, the structure is simple, design is reasonable, and stability is good.
Owner:NORTHEASTERN UNIV
Flexible sheet active and passive mixed vibration controller
PendingCN108458037ASave energyGood vibration suppression effectMechanical oscillations controlSpringsElectricityVibration control
The invention discloses a flexible sheet active and passive mixed vibration controller, belongs to the technical field of inhibition of the vibration of flexible sheets, and aims to control the vibration of the flexible sheets. The flexible sheet active and passive mixed vibration controller comprises a flexible sheet, a damping piece arranged on the flexible sheet, a piezoelectric actuator arranged on the flexible sheet, a piezoelectric sensor arranged on the flexible sheet, a driving power supply connected with the piezoelectric actuator, a data acquiring card connected with the piezoelectric sensor, and an upper computer connected with the driving power supply and the data acquiring card. The flexible sheet active and passive mixed vibration controller saves the energy at high frequency, and still achieves an excellent vibration inhibition effect at low frequency, so that the excellent inhibition effect can be maintained in a wider frequency range.
Owner:ANHUI POLYTECHNIC UNIV
Anti-vibration bearing device and anti-vibration method
PendingCN110242668AAchieve fixationAchieve rotationRotating vibration suppressionRolling contact bearingsVibration controlControl system
The invention discloses an anti-vibration bearing device, and relates to the technical field of shaft system vibration control. The device comprises a bearing inner lining, an inner permanent magnet, a bearing inner ring, a ball, a bearing outer ring, a coil, an outer permanent magnet, a bearing outer lining and a control system; the inner permanent magnet is fixedly connected to the periphery of the bearing inner lining, the bearing inner ring is fixedly connected to the periphery of the inner permanent magnet, the bearing outer lining is fixedly connected to the periphery of the outer permanent magnet, the outer permanent magnet is fixedly connected to the periphery of the bearing outer ring, the coil is wound between the bearing outer ring and the outer permanent magnet, the ball is movably mounted between the bearing inner ring and the bearing outer ring, and the bearing inner ring and the bearing outer ring can do relative rotation; and the control system is connected with the coil so as to control the coil to generate electromagnetic force for restraining vibration. The technical problem that in the prior art, the anti-vibration effect is poor, and space is occupied is solved.
Owner:NO 719 RES INST CHINA SHIPBUILDING IND
Unmanned aerial vehicle rotor arm structure with outer surface additionally provided with segmented constrained damping layer
InactiveCN109305344AVibration suppression effect is obviousDoes not affect the main structureRotocraftFiberViscoelastic damping
The invention provides an unmanned aerial vehicle rotor arm structure with the outer surface additionally provided with a segmented constrained damping layer. An unmanned aerial vehicle rotor arm comprises a rotor arm body, the constrained damping layer and a viscoelastic damping layer; the rotor arm body is of a hollow cylindrical structure made of a carbon fiber material; the constrained dampinglayer and the viscoelastic damping layer are each of a segmented hollow cylindrical shell structure, and are made of an aluminum alloy and ZN-1 damping rubber correspondingly; and the rotor arm, theviscoelastic damping layer and the constrained damping layer are tightly bonded in sequence from inside to outside. By additionally arranging the segmented constrained damping layer on the outer surface of the unmanned aerial vehicle rotor arm, the viscoelastic damping layer deforms through elastic bending vibration of the rotor arm, and thus vibration energy of the unmanned aerial vehicle rotor arm is dissipated rapidly for vibration reduction. The structure is simple, a main body structure of an unmanned aerial vehicle is not affected, extra additional mass and control device are not needed,the flight stability of the unmanned aerial vehicle is improved, and the vibration suppression effect in practical application is remarkable.
Owner:NORTHEASTERN UNIV
A Multiple Energy Dissipation Adaptive Collision Type Tuned Mass Damper
ActiveCN110528948BReduce the burden onImprove vibration damping effectProtective buildings/sheltersShock proofingVertical vibrationElastic component
The invention relates to a multiple-consumption self-adaptive collision type tuned massed damper. The damper comprises a peripheral protection unit, a vertical vibration unit, a collision gap self-coordination unit and a suspension tuned massed damping unit, wherein the vertical vibration unit is fixedly arranged at the upper end of the peripheral protection unit; the collision gap self-coordination unit is arranged in an accommodating cavity, and the upper portion of the collision gap self-coordination unit is provided with a collision cavity; and the suspension tuned massed damping unit comprises an outer massed ball, an inner massed ball and a plurality of collision energy consumption heads, a spherical cavity is formed in the center of the outer massed ball, the outer massed ball is arranged in the collision cavity, and the upper end of the outer massed ball is connected to the vertical vibration unit through a connecting component; and the inner massed ball is suspended in the spherical cavity of the outer massed ball through elastic components. The multiple-consumption self-adaptive collision type tuned massed damper has the characteristics of multiple collision nonlinear energy consumption and excitation strength adaption, a high-rise building structure dynamic response suppression effect under an earthquake and wind load effect is remarkable, and the multiple-consumption adaptive collision type tuned massed damper is applicable to structures with limited spaces, is remarkable in vibration suppression effect and good in economic and social benefit.
Owner:TONGJI UNIV
Nonlinear vibration absorber provided with segmented linear rods
The invention relates to a vibration absorbing device and particularly relates to a nonlinear vibration absorber provided with segmented linear rods. The nonlinear vibration absorber provided with thesegmented linear rods comprises a shaft sleeve, a fastening screw, a connecting rod, the segmented linear rods and a mass block; the shaft sleeve is fixedly connected to a rotor through the fasteningscrew; the mass block is of a disc structure; the mass block is provided with a center hole and four circular holes, wherein the four circular holes are different in diameter and are uniformly distributed in the circumference; the mass block is installed on the rotor in a sleeving manner; the mass block is fixedly connected with the shaft sleeve through the connecting rod; the segmented linear rods are four rigid rods which are different in diameter; one end of each segmented linear rod is fixedly connected with the shaft sleeve; and the other end of each segmented linear rod is placed insidethe corresponding circular hole and keeps a clearance with the corresponding circular hole. The nonlinear vibration absorber provided by the invention is simple in structure, restrains vibration frequency band width and achieves a remarkable effect.
Owner:NORTHEASTERN UNIV
Stay-cable external damping device
ActiveCN103469728BIncrease stiffnessSmall impact on the landscapeBridge structural detailsCable stayedEngineering
The invention discloses a stay cable external damping and vibration reduction device, including stay cables, cable hoops, bolt connectors, dampers, upper brackets, pipe hoops, support frames, diagonal bracing pipes, top surfaces of box girders, stay cables PE The outer protective tube is fixedly sleeved with a cable hoop through a bolt connection. Two single clevises are arranged on the side of the hoop close to the damper. It is connected with the double clevis at the end of the upper bracket, and the two dampers are symmetrically distributed to form an isosceles triangle with the upper bracket, and the damper is perpendicular to the center line of the stay cable; the middle part of the upper bracket passes through the bolt connection of the pipe collar In the flexible sleeve pipe hoop, the pipe hoop is welded to the top of the support frame, and the diagonal bracing pipe is fixedly connected to the upper part of the support frame through a pin; form a triangular support structure. Stay cables with simple structure, convenient installation, and adaptable to all angles.
Owner:WUXI HONGGU ZHENKONG TECH CO LTD
A device and method for actively suppressing band saw blade vibration based on main vibration mode prediction
InactiveCN103447617BHigh control precisionReal-time display of vibration amplitudeMetal sawing accessoriesMeasurement/indication equipmentsVibration amplitudeEngineering
Owner:HANGZHOU DIANZI UNIV
A miniature compound dynamic shock absorber that can be attached and installed
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Active vibration suppression system and method for flexible truss structures based on piezoelectric materials
ActiveCN104092403BQuality improvementSmall sizePiezoelectric/electrostriction/magnetostriction machinesElectricityDiagonal
The invention provides a flexible truss structural vibration active suppression system and method based on piezoelectric materials. The system comprises a main supporting rod fixed to the ground, a flexible transverse rod and flexible diagonals located on the two sides of the flexible transverse rod are fixed to the main supporting rod, an installation clamp is fixed to the main supporting rod, the other end of the installation clamp is connected with the end, on the short shaft side, of a rhombic actuator through a first rigid rope, the other end of the short shaft side of the rhombic actuator is connected with a positioning clamp fixed to one flexible diagonal through a second rigid rope, the length direction of the first rigid rope, the length direction of the second rigid rope and the length direction of the positioning clamps are located on the same straight line and perpendicular to the flexible diagonals, and the other end of the flexible transverse rod and the other ends of the flexible diagonals are connected with the body of a flexible truss structure. The invention further provides the control method of the flexible truss structural vibration active suppression system. According to the flexible truss structural vibration active suppression system and the control method of the flexible truss structural vibration active suppression system, the inverse piezoelectric effect of a piezoelectric stack is utilized to output micro displacement and large control force, a rhombic displacement amplification mechanism is used for amplifying output displacement, control is applied to the flexible truss structure, and vibration active suppression of the flexible truss structure can be achieved.
Owner:XI AN JIAOTONG UNIV
A Model-adaptive Active Vibration Suppression Method
ActiveCN114112291BImprove efficiencyVibration suppression effect is obviousSustainable transportationAerodynamic testingOptimal controlControl parameters
The invention belongs to the field of active vibration control of an aircraft wind tunnel model, and provides a model-adaptive vibration active suppression method. The method first obtains the open-loop frequency response and natural frequencies of each order by performing sinusoidal sweep frequency excitation on a model support system. Secondly, the vibration signals in the time domain are separated to obtain the vibration modes of the system, and the transfer function of the system is identified. Finally, the control parameters are adjusted based on the identified model parameters, and the optimal control parameters are obtained to realize the active vibration suppression of the model. The method provided by the invention can adaptively adjust the control parameters according to the characteristics of different types of aircraft model systems, so as to realize rapid and effective suppression of the vibration of multiple types of models, with strong adaptability and high accuracy.
Owner:DALIAN UNIV OF TECH
Transmission, tilting and vibration reduction system of a helicopter test device in an icing wind tunnel
ActiveCN112345197BSimple transmissionImprove balanceAerodynamic testingMechanical energy handlingDrive shaftClassical mechanics
The invention discloses a transmission, tilting and vibration reduction system of an icing wind tunnel helicopter test device, which comprises a fixed frame; a tilting support frame, which is arranged on the fixed frame; and a transmission system, wherein the transmission shaft passes through the tilting frame. The support frame; the tilting shaft, one end of which is connected with the transmission system, and the other end is connected with the tilting support frame; the inclination driver, one end of which is connected with the fixed frame, and the other end is connected with the transmission system; the shock absorber, one end of which is connected with the fixed frame, The other end is connected with the transmission system, and the shock absorber is arranged on the other side of the transmission system relative to the inclination driver. By adopting the transmission, tilting and damping system of the icing wind tunnel helicopter test device of the present invention, the stability of the whole test device can be guaranteed.
Owner:LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
A Dynamic Vibration Absorber for Rotor System Using Nonlinear Energy Sink Mechanism
InactiveCN108331882BPrevent rotationPrevent tamperingRotating vibration suppressionNon-rotating vibration suppressionNoise controlFixed frame
The invention discloses a dynamic vibration absorber for a rotor system that utilizes a nonlinear energy trap mechanism, which includes a vibration absorber body and a support component fixing device. The vibration absorber body includes support components, connecting components and vibration absorber mass blocks. The support component includes bearings, supports and bushings; the connection component includes nuts, connecting rods and segmented linear rods. The segmented linear rods constitute segmented linear stiffness and fit nonlinear cubic stiffness; there are connecting holes and gaps on the vibration absorber mass block holes to form a fit with the connecting component. The gap fit between the absorber mass block and the segmented linear rod constitutes a nonlinear energy trap mechanism. Support component fixing devices include bolts, fixing brackets, springs and connecting pieces. The invention can effectively suppress the wide-band vibration of the rotor system and belongs to the field of vibration and noise control. The overall structure is compact, the additional mass is small, the reliability is high, the use is convenient, and no external energy is required.
Owner:NORTHEASTERN UNIV LIAONING
A vibration-damping elastic support structure for ball screw pair
InactiveCN105485282BReduce radial connection stiffnessRadial connection stiffness suppressionGearingVibration controlMetal rubber
An elastic supporting structure for damping a ball screw pair belongs to the field of vibration control of ball screw pairs, and comprises a squirrel-cage elastic sleeve (1), metal rubber gaskets (2), metal rubber rings (3) and outer sleeves (4). The elastic supporting structure is connected with a nut and a nut seat of the ball screw pair. On the premise of ensuring the axial rigidity, the radial connecting rigidity between the nut and a worktable is reduced. Through the reasonable design of the radial rigidity of the elastic supporting structure, the radial inherent frequency of a screw is improved, the variable range of the radial inherent frequency of the screw, which is caused by nut movement, is reduced, the radial dynamic characteristic of the screw is improved, and the critical speed of revolution of the ball screw pair is increased. A metal rubber damping material is arranged in the elastic supporting structure, so that the radial vibration of the ball screw pair is further inhibited. The density and the rigidity of metal rubber are reasonably selected so as to optimize the vibration inhibition effect, the operation performance of the ball screw pair is improved, and the operation noise is reduced. The elastic supporting structure is applied to ball screw pairs of different types and different working conditions.
Owner:BEIJING UNIV OF TECH
Method for determining the parameters of double-helix hot-extruded polyethylene semi-parallel steel wire stay cables
ActiveCN106284075BVibration suppression effect is obviousGood vibration suppression effectBridge structural detailsTextile cablesHelical lineCable stayed
The invention discloses a method for determining the parameters of a double-helix hot-extruded polyethylene semi-parallel cable-stayed cable, which belongs to the field of cable-stayed bridges. Wind the raised double helix on the outer surface of the stay cable in the same direction, determine the diameter d of the helix and the winding distance S of the same helix according to the wind tunnel test, and find out the double helix winding with the stay cable of different diameter line, the combination of parameter values with the smallest aerodynamic resistance under the premise of suppressing wind and rain vibration; where, S is the multiple of the diameter D of the stay cable. The invention not only can suppress the wind and rain vibration, but also has the best aerodynamic resistance.
Owner:SHIJIAZHUANG TIEDAO UNIV
A Nonlinear Vibration Absorber with a Segmented Linear Rod
Owner:NORTHEASTERN UNIV LIAONING
A system and method for active vibration control of flexible structures based on voice coil motor
ActiveCN104074904BGet the most out of performanceAchieving Active Vibration ControlShock absorbersControl systemEngineering
The invention discloses an active vibration control system of a flexible structure based on a voice coil motor and a method thereof, wherein the system comprises a main support rod fixed on the ground, a rail is fixed on the main support rod, left and right oblique rods on both sides of the rail are symmetrically fixed to the main support rod, left and right large displacement actuators adjacent to the left and right oblique rods are fixed on both sides of the main support rod when the rail is as a symmetry axis, both sides of the other end of the rail are symmetrically fixed with stationary fixtures on which fixed pulleys are mounted, and the top of the rail is provided with the flexible structure; the other ends of the left and right oblique rods are connected with positioning fixtures on which hole bolts are mounted, the fixed pulleys, the hole positions of the hole bolts and the left and right oblique rods are located on the same plane, and a rigid rope passes through the left large displacement actuator, the fixed pulleys and the holes of the hole bolts; besides, the invention further discloses a control method of the system; the active vibration control system outputs large displacement and greater control force through the voice coil motor, a control direction is shifted by the pulleys such that the active modal vibration control of the flexible structure can be realized.
Owner:XI AN JIAOTONG UNIV
Transmission, tilting and vibration reduction system of icing wind tunnel helicopter test device
ActiveCN112345197AImprove continuityShorten the effective lengthAerodynamic testingMechanical energy handlingDrive shaftControl theory
The invention discloses a transmission, tilting and vibration reduction system of an icing wind tunnel helicopter test device. The transmission, tilting and vibration reduction system comprises a fixed frame, a tilting support frame which is arranged on the fixed frame, a transmission system of which the transmission shaft penetrates through the tilting support frame, a tilting shaft with one endbeing connected with the transmission system, and the other end being connected with the tilting support frame, an inclination angle driver with one end being connected with the fixed frame, and the other end being connected with the transmission system, and a shock absorber with one end being connected with the fixed frame, and the other end being connected with the transmission system, wherein the shock absorber is arranged on the other side, opposite to the inclination angle driver, of the transmission system. By adopting the transmission, tilting and vibration reduction system of the icingwind tunnel helicopter test device, the stability of the whole test device can be ensured.
Owner:LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
Fault diagnosis and feedback system according to third octave flutter of high-speed cold rolling mill
InactiveCN103521531BReduce vibrationEliminate self-excited vibrationRoll mill control devicesMeasuring devicesData streamVibration control
The invention discloses a fault diagnosis and feedback system according to third octave flutter of a high-speed cold rolling mill, and relates to the field of sensing signals of the rolling mill and computer automatic control engineering. The fault diagnosis and feedback system is mainly composed of a rolling mill signal acquisition unit, a computer diagnosis control unit, a rolling mill vibration abatement execution unit and an off-line model adjustment unit. The fault diagnosis and feedback system is mainly characterized in that according to the principles and characteristics of the third octave flutter of the rolling mill, acquired signals are guided into the computer diagnosis control unit, sorted and analyzed, then, a vibration control module generates vibration abatement signals, the vibration abatement signals are output to the vibration abatement execution unit so that the rolling mill can be adjusted in terms of a plate tension relaxation device and a main transmission speed and the vibrating energy of the rolling mill is lowered, and then self-excited vibration of the rolling mill is eliminated; meanwhile, acquired control data streams are transmitted to a computer of the off-line model adjustment unit, and an expert system is used for off-line fault diagnosis and analysis to improve fault diagnosis and a control algorithm.
Owner:TIANJIN UNIVERSITY OF TECHNOLOGY
A Nonlinear Energy Well with Segmented Linear Beams Applied to Rotor Systems
InactiveCN110230661BReasonable designSimple structureRotating vibration suppressionEngineeringMechanics
A nonlinear energy sink (Nonlinear energy sink, NES) with a segmented linear beam applied to a rotor system of the present invention includes an NES frame, a plurality of leaf springs and a plurality of mass blocks, and one end of the leaf spring is connected to the NES frame , the other end is correspondingly connected to a mass block, and a plurality of leaf springs are evenly arranged. In the present invention, the cubic stiffness beam is equivalently replaced by a segmented linear stiffness beam. The fitting accuracy of the nonlinear energy well to the cubic stiffness is high, and the change of the segmental linear stiffness is related to the vibration displacement of the system. By changing the segmented linear beam and The gap between the mass blocks can effectively change its nonlinearity; the nonlinear energy well allows the energy of the system to be damped to be transmitted to the outside of the system through the nonlinear energy well for consumption. Its structure is simple and compact, and its design is reasonable. The effect is remarkable.
Owner:NORTHEASTERN UNIV LIAONING
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