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39results about How to "High static stiffness" patented technology
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Two-degree-of-freedom ultralow-frequency vibration isolator
ActiveCN106321707ARealization of ultra-low frequency vibration isolation with degrees of freedomVibration isolation achievedNon-rotating vibration suppressionSprings/dampers functional characteristicsMarine engineeringAir spring
The invention discloses a two-degree-of-freedom ultralow-frequency vibration isolator. The two-degree-of-freedom ultralow-frequency vibration isolator comprises a basic platform (10) and a load-bearing platform (30), and the basic platform (10) and the load-bearing platform (30) are connected through supporting rods. The two-degree-of-freedom ultralow-frequency vibration isolator is characterized in that the vibration isolator further comprises a positive-stiffness air spring (20) and a magnetic negative-stiffness mechanism (28) with adjustable negative stiffness, and the positive-stiffness air spring (20) and the magnetic negative-stiffness mechanism (28) form a parallel mechanism in the direction of the center axes of the basic platform and the load-bearing platform, so that the inherent frequency in the direction of the center axes of the basic platform and the load-bearing platform is decreased; and a stiffness-adjustable positive-stiffness leaf spring and a negative-stiffness inverted pendulum are arranged in the direction perpendicular to the center axes of the basic platform and the load-bearing platform and form a negative-stiffness parallel mechanism, so that the inherent frequency in the direction perpendicular to the center axes of the basic platform and the load-bearing platform is decreased. According to the vibration isolator, positive-stiffness and negative-stiffness parallel type passive structures are adopted both in the direction of the center axes of the basic platform and the load-bearing platform and in the direction perpendicular to the center axes of the basic platform and the load-bearing platform, and thus vibration of two degrees of freedom is achieved at the same time.
Owner:HUAZHONG UNIV OF SCI & TECH
Non-linear press-rod spring device
InactiveCN1936357AImprove carrying capacityReduced carrying capacityNon-rotating vibration suppressionShock absorbersEngineeringBar pressing
Owner:HARBIN INST OF TECH
Quasi zero stiffness vibration isolator using multilayer squeezing type magnetic spring and oscillating bar
ActiveCN108167362ALower natural frequencyCompact structureMagnetic springsDynamic stiffnessNegative stiffness
The invention discloses a quasi zero stiffness vibration isolator using multilayer squeezing type magnetic spring and oscillating bars. The vibration isolator comprises a main shaft, guiding shafts, the oscillating bars and a multiplayer structure; the multilayer structure comprises an upper roof arranged from top to bottom in sequence, an upper end cover, a negative stiffness unit, a lower end cover, positive stiffness unit and a bottom plate; the main shaft is a center shaft with multilayer structure; the guiding shafts and the oscillating bars are multiple, and are all arranged around the main shaft at fixing intervals; the structure is compact, and has more bearing ability under relatively small size. In addition, the negative stiffness unit and the positive stiffness unit are connected in parallel by the vibration isolator using the principle of magnetic negative stiffness; the vibration isolator has the characteristics of high static stiffness and low dynamic stiffness, the inherent frequency of the vibration isolator can be efficiently reduced, the vibration isolation frequency band is widened, and the vibration isolator is suitable for low frequency vibration isolation; thenegative stiffness unit is in the form of multilayer squeezing type magnetic spring, the stronger magnetic induction intensity can be produced, the negative stiffness of magnetic spring is increased,the negative stiffness unit is suitable for high loading occasion, and a wide range of applications is met.
Owner:SHANGHAI UNIV
High-rigidity large-torque vertical machining center
InactiveCN103358185AImprove rigidityImprove efficiencyLarge fixed membersDriving apparatusFailure rateBall screw
The invention relates to a vertical machining center, in particular to a high-rigidity large-torque vertical machining center. The machining center mainly solves the technical problems that high-grade and low-grade reduction boxes are high in price, high speed gears operate in ultimate states, the failure rate is high, the use and maintenance costs are high, the machining requirements of other reduction ratios such as 1:2 / 1:3 cannot be met, the rigidity of a spindle is poor, and the tool changing failure frequency is high in vertical machining in the prior art. The machining center comprises a honeycomb type bed, wherein a double-layer ribbed carriage and a workbench are arranged on the honeycomb type bed; a herringbone frame upright is also arranged on the bed and connected with a spindle box by a guide rail in a sliding manner; a ball screw is arranged on the herringbone frame upright; the spindle box is in threaded connection with the ball screw; a tool magazine and an unclamping cylinder is arranged on the spindle box; the spindle box is internally provided with a 1:2 / 1:4 / 1:8 speed reducer; a spindle location device is arranged on a spindle of the spindle box; and the vertical machining center is provided with an electric and numerical control system.
Owner:HANGZHOU DATIAN CNC MACHINE TOOL
Vibration isolator
ActiveCN105972150AImprove the vibration isolation effectReduce transmission rateVibration dampersVibration suppression adjustmentsVibration controlAir spring
The invention relates to the technical field of structural vibration control and discloses a vibration isolator. The vibration isolator comprises a steel plate spring, a first air spring, a second air spring, a foundation and a device waiting vibration isolation, wherein the first air spring and the second air spring are horizontally arranged and are located on the two sides of the device waiting vibration isolation, and the two ends of each of the first air spring and the second air spring are hinged to the foundation and the device waiting vibration isolation respectively through bolts; the two air springs provide non-linear restoring force and damping force for the device waiting vibration isolation and guarantee that the device waiting vibration isolation moves in the vertical direction; the steel plate spring is horizontally arranged and provides linear and elastic support for the device waiting vibration isolation, and the two ends of the steel plate spring are fixedly connected to the device waiting vibration isolation and the foundation respectively through bolts. The vibration isolator has the advantages that the static deformation can be effectively reduced, and therefore the static rigidity can be improved, and the stability of a system can be improved; the inherent frequency of the system can be effectively lowered, and therefore the vibration isolation area can be expanded, and the vibration isolation efficiency can be improved; the transmissibility of a resonance region and a vibration isolation region can be simultaneously and effectively lowered, and therefore the vibration isolation effect of the vibration isolator can be improved.
Owner:DALIAN UNIV OF TECH
Vibration isolator with high static low dynamic stiffness characteristics and rail system with vibration isolator
PendingCN110285180ALow Isolation Start FrequencyLow static load capacityNon-rotating vibration suppressionRailway tracksDynamic stiffnessNegative stiffness
The invention provides a vibration isolator with high static low dynamic stiffness characteristics and a rail system with the vibration isolator. The vibration isolator with the high static low dynamic stiffness characteristics comprises a positive stiffness assembly, a supporting part, a floating part and a negative stiffness assembly, wherein the positive stiffness assembly comprises a seat body and a first elastic piece arranged in a cavity of the seat body; the supporting part is in abutting connection with the upper end of the first elastic piece; the floating part is connected with the supporting part in a matched mode; the negative stiffness assembly comprises an elastic part and a bearing part which are matched with each other, the elastic part is connected with the supporting part and / or the floating part, and the bearing part is connected with the seat body; and the floating part bears loads and compresses the first elastic piece, and the direction of the acting force applied to the bearing part by the elastic part is inclined or vertically arranged relative to the direction of the elasticity of the first elastic piece. According to the technical scheme, the inherent frequency of an existing rail system can be reduced, the vibration isolation frequency range and the low-frequency vibration reduction effect of an existing vibration isolator and the existing rail system can be improved, and the dynamic displacement of a train when the train passes through the rail system can be effectively controlled.
Owner:RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +1
Quasi-zero stiffness elastic joint and construction method and construction device thereof
ActiveCN113027968AHigh static stiffnessLow dynamic stiffnessSpringsSprings/dampers functional characteristicsBogieDynamic stiffness
The invention discloses a quasi-zero-stiffness elastic joint and a construction method and a construction device thereof. The quasi-zero-stiffness elastic joint comprises an outer sleeve, a positive stiffness element and a negative stiffness element. The outer sleeve is arranged on the positive stiffness element in a sleeving manner; the negative stiffness element is arranged in the positive stiffness element, and when vibration occurs, the negative stiffness generated by the negative stiffness element counteracts the positive stiffness generated by the positive stiffness element. The quasi-zero-stiffness elastic joint has the advantages of being high in static rigidity, low in dynamic rigidity, wide in vibration reduction frequency domain, good in low-frequency vibration isolation characteristic, capable of effectively reducing vibration transmitted from a rail to a frame-work, between the framework and a bogie and between the bogie and a vehicle body, capable of effectively reducing the vibration of the vehicle body and capable of improving passenger com-fort and running stability; meanwhile, the quasi-zero-stiffness elastic joint is compact in structure, adopts a built-in parallel installation mode, does not change the interface form and size of the elastic joint, and can realize vertical, axial, deflection and torsion movement along with the elastic joint.
Owner:CRRC QINGDAO SIFANG ROLLING STOCK RES INST
Gantry machining center with high rigidity and large torque
The invention relates to a machining center, and in particular to a gantry machining center with high rigidity and large torque. The gantry machining center mainly solves the technical problems existing in the prior art that a high-low gear reduction gearbox is expensive, a high speed gear works in the limiting condition, the failure rate is high, and the cost of using and maintenance is high; requirements of processing at the reduction ratio of 1:2 / 1:3, and the like cannot be satisfied; the rigidity of a main shaft of a vertical processing is bad, tool changing failure frequency is high, and the like. The gantry machining center comprises a lathe bed, wherein the lathe bed is provided with a vertical column and a working table; a cross beam is arranged at the upper end of the vertical column; a tool magazine is arranged at one end of the cross beam; the cross beam is provided with a cross beam guide rail, a sliding saddle is slidably connected with the cross beam; the sliding saddle is provided with a ram of a high rigid guide rail structure; the ram is provided with the main shaft and a tool hitting cylinder; the main shaft is connected with a main motor through a reducing gear with wheels; the main shaft is further provided with a main shaft positioning device; the gantry machining center is provided with an electrical and numerical control system.
Owner:HANGZHOU DATIAN CNC MACHINE TOOL
Boring tool holder of combined machining machine special for drum shafts
InactiveCN105522403AHigh precisionHigh static stiffnessPrecision positioning equipmentFeeding apparatusEngineeringMachining
The invention relates to the machining field of steel strips, in particular to a boring tool holder of a combined machining machine special for drum shafts. The boring tool holder comprises a main boring shaft, a ram and a ram feed assembly; a boring tool is installed on the main boring shaft and located through conical holes, and an end-face key transmits torque; the main boring shaft is installed in the ram, and the ram is fed through the ram feed assembly installed below the ram. According to the scheme, the behavior errors of machined work-pieces are reduced, and the surface accuracy is improved.
Owner:CFHI SHAOXING HEAVY MACHINE TOOL
Metal and rubber combined type vibration isolation device of space remote sensing camera and installation method of metal and rubber combined type vibration isolation device
PendingCN114215870AHigh static stiffnessLow dynamic stiffnessMultiple spring combinationsSprings/dampers design characteristicsDynamic stiffnessMetal rubber
The invention discloses a metal and rubber combined vibration isolation device of a space remote sensing camera, which comprises a limiting cover plate, a rubber pad and a mandrel bottom plate, and is characterized in that the limiting cover plate and the mandrel bottom plate are adopted to compress the rubber pad, so that the rubber pad compresses a vibration-isolated object mounting foot, and vibration isolation is realized; a limiting structure used for further accurately controlling the compression amount of the rubber pad is further designed, ideal dynamic rigidity can be obtained in the radial direction and the axial direction of the vibration isolation device, on one hand, the good attenuation effect on high-frequency loads can be achieved, on the other hand, the low-frequency vibration response can be amplified and limited within a certain range, and meanwhile, the vibration isolation device has the good application prospect. The influence of the impact load on the remote sensing camera is effectively isolated; the metal and rubber combined mode is adopted, effective vibration isolation is achieved, meanwhile, the problem that the compression amount is difficult to control is solved, the compression amount of the vibration isolation device can be adjusted only by replacing the metal piece, operation is easy, and reliability is high. The invention further discloses an installation method of the vibration isolation device. The installation method is easy and convenient to operate and high in applicability.
Owner:BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
Vibration isolator with high static low dynamic stiffness characteristics and rail system with vibration isolator
PendingCN110285181ALow Isolation Start FrequencyLow static load capacityNon-rotating vibration suppressionRailway tracksDynamic stiffnessNegative stiffness
The invention provides a vibration isolator with high static low dynamic stiffness characteristics and a rail system with the vibration isolator. The vibration isolator comprises a positive stiffness assembly, a supporting part, a floating part and a negative stiffness assembly, wherein the positive stiffness assembly comprises a seat body and a first elastic piece arranged in a cavity of the seat body; the supporting part is in abutting connection with the upper end of the first elastic piece; the floating part is connected with the supporting part in a matched mode; the negative stiffness assembly comprises an elastic part and a bearing part which are matched with each other, the elastic part is connected with the supporting part or the floating part, the bearing part is arranged on the outer wall of the seat body; and the floating part bears loads and compresses the first elastic piece, and the direction of the acting force applied to the bearing part by the elastic part is inclined or vertically arranged relative to the direction of the elasticity of the first elastic piece. According to the technical scheme of the vibration isolator, the inherent frequency of an existing rail system can be reduced, the vibration isolation frequency range and the low-frequency vibration reduction effect of an existing vibration isolator and the existing rail system can be improved, and the dynamic displacement of a train when the train passes through the rail system can be effectively controlled.
Owner:RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +1
State parameter obtaining device used for electro-hydraulic servo control system
InactiveCN108626206AHigh precisionHigh static stiffnessFluid-pressure actuator testingFluid-pressure actuator componentsControl signalControl system
The invention belongs to the field of electro-hydraulic control, and discloses a state parameter obtaining device used for an electro-hydraulic servo control system. The state parameter obtaining device comprises an acceleration sensor, a position speed sensor, a position giving controller, a position controller, a first-order differential controller, a second-order differential controller, a third-order differential controller, a speed controller, an acceleration controller and a system controller. The state parameter obtaining device performs real-time online acquisition on six state parameters which are displacement, speed, acceleration, displacement deviation, speed deviation and acceleration deviation of the electro-hydraulic servo system, and provides state parameters for the systemcontroller, and the system controller outputs a control signal to drive a hydraulic performing unit to work to improve control performance of the electro-hydraulic servo system according to differentcontrol strategies. The state parameter obtaining device is suitable for realizing controlling various electromechanical-hydraulic cooperative control systems through various state parameters.
Owner:TAIYUAN UNIV OF TECH
Shape memory alloy based impact load retarding device and method
ActiveCN110469614AReduce shock loadSmall phase transition critical stressShock absorbersShock proofingCritical stressShape-memory alloy
The invention discloses a shape memory alloy based impact load retarding device. The shape memory alloy based impact load retarding device comprises a shape memory alloy gasket, a shape memory alloy sleeve and a connector. The shape memory alloy sleeve is arranged between an upper connecting piece to be subjected to vibration attenuation and a lower connecting piece to be subjected to vibration attenuation. The connector comprises a nut and a connecting rod. The shape memory alloy gasket is used for being arranged on the upper connecting piece. One end of a rod body of the connecting rod is provided with a cap body. The rod body penetrates through the upper connecting piece, the sleeve, the lower connecting piece and the shape memory alloy gasket in sequence. The other end of the rod bodyis in threaded connection with the nut. The shape memory alloy gasket and the shape memory alloy sleeve are both in a martensite phase transformation critical stress state by tightening the nut. The invention further discloses an impact load retarding method of the shape memory alloy based impact load retarding device. Through the impact load retarding method, the assembly tightness of the upper connecting piece, the lower connecting piece and the connector is ensured, impact and vibration between the upper connecting piece and the lower connecting piece are reduced. Moreover, the shape memoryalloy based impact load retarding device is simple in structure and easy to dismantle.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Device for winding web of material
Owner:VOITH PATENT GMBH
An Active-Passive Composite Vibration Isolator Using Parallel Connection of Positive and Negative Stiffnesses
ActiveCN106321719BAchieving positive stiffness properties in the vertical directionAchieve magnetic negative stiffness characteristicsMagnetic springsGas based dampersAir springNegative stiffness
The invention discloses an active-passive combined vibration isolator based on positive-stiffness and negative-stiffness parallel connection. The active-passive combined vibration isolator based on positive-stiffness and negative-stiffness parallel connection comprises a basic platform (10), a load-bearing platform (30), a passive vibration isolation unit and an active vibration isolation unit, wherein the passive vibration isolation unit is provided with a positive-stiffness air spring (20) and a magnetic negative-stiffness mechanism (28) with adjustable negative stiffness in the first direction, so that the inherent frequency in the first direction is decreased, and the passive vibration isolation unit is provided with a stiffness-adjustable positive-stiffness leaf spring and a negative-stiffness inverted pendulum in the second direction, so that the inherent frequency in the second direction is decreased; the active vibration isolation unit is arranged at the outer side of the passive vibration isolation unit, the upper end of the active vibration isolation unit is linked with the load-bearing platform (30), and the lower end of the active vibration isolation unit is linked with the basic platform (10); and the active vibration isolation unit comprises displacement sensors, speed sensors, a proportional pressure valve and a voice coil motor, and the voice coil motor is used for fine adjustment of the load-bearing platform, so that vibration is further isolated. The active-passive combined vibration isolator based on positive-stiffness and negative-stiffness parallel connection has high bearing capacity, and active and passive vibration isolation of two degrees of freedom is achieved at the same time.
Owner:HUAZHONG UNIV OF SCI & TECH
Suspension assembly for vehicle
ActiveCN109050227AEasy to assembleAchieve secondary shock absorptionElectric propulsion mountingControl devicesVehicle frameReduction drive
The invention discloses a suspension assembly for a vehicle, comprising: a front common bracket; Speed reducer suspension, the speed reducer suspension is arranged on the front common bracket; Motor suspension, the motor suspension is arranged on the front common bracket and is spaced apart from the speed reducer suspension; A left suspension and a right suspension, the left suspension and the right suspension being arranged at the left and right ends of the front common bracket, respectively, and the speed reducer mount and the motor mount being positioned between the left suspension and theright suspension, the left suspension and the right suspension being adapted to be connected with the left and the right longitudinal beams of the vehicle, respectively; And a rear bracket adapted tobe secured to a subframe of the vehicle, the rear bracket being provided with a rear suspension, wherein the reducer mount, the motor mount and the rear mount are used for mounting a powertrain of thevehicle. A suspension assembly for a vehicle accord to an embodiment of that present invention integrally mounts a plurality of suspension on a front common bracket, facilitates assembly, and enablessecondary shock absorption.
Owner:BEIJING ELECTRIC VEHICLE
A multi-degree-of-freedom low-frequency vibration isolator based on the coupling of vibration mode and pendulum mode
The invention relates to a multi-degree-of-freedom low frequency vibration isolator based on vibration mode and swing mode coupling. The multi-degree-of-freedom low frequency vibration isolator mainlycomprises a high static state stiffness vibration isolator body and a low dynamic state stiffness vibration isolator body which are the same and are symmetrically arranged up and down, and supportingrods of the high static state stiffness vibration isolator body and the low dynamic state stiffness vibration isolator body are connected with a space swing mechanism through two spherical hinges; the high static state stiffness vibration isolator body and the low dynamic state stiffness vibration isolator body are each provided with a spiral spring and a magnetic negative stiffness mechanism; each spiral spring provides positive stiffness supporting along an axial support; each magnetic negative stiffness spring is formed by three attracted annular permanent magnets and provides nonlinear resilience and negative stiffness characteristics in the vertical direction; and the high static state stiffness vibration isolator body and the low dynamic state stiffness vibration isolator body achieve motion coupling with the space swing mechanism, quasi-zero stiffness characteristics and geometric nonlinearity damping in the horizontal direction are achieved, and low-frequency vibration of an object subject to vibration isolation in three transverse movement directions is effectively isolated. The multi-degree-of-freedom low frequency vibration isolator has the beneficial effects of high bearing capacity and low resonant frequency, and the good inhibitory effect on the low frequency vibration in multiple degree-of-freedom directions is achieved.
Owner:XI AN JIAOTONG UNIV
Boom assembly for washing machine and pulsator washing machine
InactiveCN108930133AHigh static stiffnessLow dynamic stiffnessOther washing machinesTextiles and paperEngineeringMagnet
The invention discloses a boom assembly for a washing machine and a pulsator washing machine. The boom assembly for a washing machine includes a boom and a spring damping assembly. The spring dampingassembly includes an upper bracket, a spring and a lower bracket disposed on the boom, and further includes a magnetic assembly including a first magnet and a second magnet mutually generating magnetic forces. The first magnet is disposed on the boom. The second magnet is movable relative to the boom. Vibration absorbing performance of the boom assembly for the washing machine is realized, so as to improve use reliability and user experience of the pulsator washing machine.
Owner:QINGDAO HAIER WASHING MASCH CO LTD +1
Belt coat composition
InactiveUS20070155876A1Improved long-term casing durabilityExcellent reversion resistanceLayered productsSpecial tyresDynamic stiffnessTear resistance
A composition for coating steel belts used in constructing a radial medium truck (RMT) tire, having improved tensile strength and modulus retention, increased dynamic stiffness, increased fracture and tear resistance, and improved reversion resistance.
Owner:THE GOODYEAR TIRE & RUBBER CO
Two-stage vibration isolation buffer
ActiveCN112253665AHigh static stiffnessLow dynamic stiffnessLiquid springsSolid based dampersCylinder blockControl theory
The invention discloses a two-stage vibration isolation buffer, and belongs to the technical field of vibration isolation buffers. The problems that an existing vibration isolation buffer is low in energy conversion rate and longitudinal impact resistance are solved. The lower portion of a connecting end cover is arranged between two cylinder bodies and fixedly connected with the second-stage cylinder body, the upper portion of the connecting end cover is inserted into the first-stage cylinder body and fixedly connected with the inner wall of the first-stage cylinder body, a piston is arrangedin the first-stage cylinder body in an up-down sliding mode, and the upper portion of the piston penetrates through the first-stage cylinder body and is fixedly connected with a guide cylinder; and acomposite membrane is fixedly clamped between the connecting end cover and the second-stage cylinder body and attached to the inner wall of the connecting end cover, the upper surface of the middle of the composite membrane is attached to the bottom of the piston, and the composite membrane, the connecting end cover and the first-stage cylinder body form a closed first-stage cavity. Two closed cavities which are isolated from each other are formed, energy consumption and energy storage are achieved at the same time, and on the basis of a molecular spring, the problem that low inherent frequency and small static deformation cannot be achieved at the same time under heavy loads is solved in combination with the working principle of the energy consumption type vibration isolation buffer.
Owner:HARBIN ENG UNIV
Automobile suspension mounting structure
PendingCN111731088AImprove the vibration isolation effectImprove local static stiffnessElectric propulsion mountingJet propulsion mountingStructural engineeringWelding
The invention discloses an automobile suspension mounting structure. The mounting structure comprises a suspension mounting upper plate and a suspension mounting lower plate, the suspension mounting upper plate is fixedly welded on the upper surface of the suspension mounting lower plate; a reinforcing upper plate and a reinforcing lower plate are arranged in a cavity between the suspension mounting upper plate and the suspension mounting lower plate; a side plate of the reinforcing upper plate is of a hollow structure; the reinforcing upper plate is welded to the upper side of the reinforcinglower plate in a seam mode. The reinforcingupper plate and the reinforcing lower plate form a mouse cage-shaped reinforcing structure; welding grooves are formed in a top plate of the suspension mounting upper plate and the suspension mounting lower plate, a top plate of the reinforcing upper plate is fixedly welded to the welding groove of the suspension mounting upper plate, and a bottom plate of the reinforcing lower plate is fixedly welded to the welding groove of the suspension mounting lower plate. The static rigidity and the dynamic rigidity of the suspension mounting structure are improved, the weight of the reinforcing structure is reduced, the cost is reduced, and the suspension mounting structure is suitable for large-scale mass production.
Owner:HANTENG AUTOMOBILE CO LTD
Rail system
PendingCN110284375AHigh static load capacityHigh static stiffnessBallastwayDynamic stiffnessHydrostatic pressure
The invention provides a rail system. The rail system comprises a floating plate, supporting rail tables, fastening assemblies, steel rails and a vibration isolator with high hydrostatic pressure and low dynamic stiffness characteristic, wherein the supporting rail tables are poured on the floating plate; the steel rails are fixed on the supporting rail tables through the buckle assemblies; a positive stiffness assembly of the vibration isolator comprises a seat body and first elastic parts arranged in a cavity of the seat body, and the bottom of the seat body is arranged on a base; a supporting part abuts against the upper ends of the first elastic parts; floating parts are poured in the floating plate, and a gap is formed between the floating plate and the base; a negative stiffness assembly comprises elastic parts and bearing parts which are mutually matched, the elastic parts are connected to the supporting part and / or the floating parts, and the bearing parts are connected to the seat body; when the floating parts bear load, the direction of acting force, applied to the bearing parts, by the elastic parts is set in an inclined mode or perpendicularly relative to the direction of elastic force of the first elastic parts. With the adoption of the technical scheme, the rail system can improve vibration isolating frequency range and low-frequency vibration damping effect of the vibration isolator and the rail system, and controls dynamic displacement while a train passes through the rail system.
Owner:RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +1
A gas-liquid elastic dual-frequency vibration isolator
ActiveCN108087473BSimple structureReduce weightSpringsGas and liquid based dampersDynamic stiffnessIsolator
The invention discloses a gas-liquid elastic dual-frequency vibration isolator, and belongs to the technical field of vibration isolation design. The gas-liquid elastic dual-frequency vibration isolator comprises a shell, an inner cylinder, elastic rubber, a piston body, a lower cover body and an air cavity additionally-arranged air chamber; one end of the inner cylinder is arranged inside the shell, the elastic rubber is arranged between the shell and the inner cylinder, and the side face of the elastic rubber, the shell and the inner cylinder are bonded to form a sealed upper liquid cavity;anti-falling bolts are arranged in the circumferential direction of the shell to prevent the elastic rubber from falling off; one end of the inner cylinder is provided with an air compensating cavity,the air compensating cavity is provided with the piston body, a lower liquid cavity is formed between the piston body and the inner cylinder, and the lower liquid cavity communicates with the upper liquid cavity; the air compensating cavity is provided with a lower cover body in an internally screwed mode, and the cavity between the lower cover body and the piston body communicates with the air cavity additionally-arranged air chamber for changing the supporting rigidity of the piston body; and the gas-liquid elastic dual-frequency vibration isolator is arranged in a main supporting reductionrod of a helicopter through the shell and the lower cover body and used for isolating vibration. The gas-liquid elastic dual-frequency vibration isolator has the advantages that the structure is simple, the weight is small, the frequency band of vibration isolation is wide, and the dynamic stiffness of antiresonance points is low.
Owner:CHINA HELICOPTER RES & DEV INST
Adjustable nonlinear double-layer vibration isolation device
InactiveCN106286665BGuaranteed static stabilityPrecise adjustment of negative stiffnessMagnetic springsDynamic stiffnessNoise control
The invention belongs to the technical field of vibration noise control, and particularly relates to a nonlinear vibration-isolating device. The adopted technical scheme is as follows: an adjustable nonlinear double-layer vibration-isolating device comprises a nonlinear-level upper layer (1), lower-layer shock absorbers (2) and side plates, wherein the lower-layer shock absorbers (2) are lug boss-type rubber shock absorbers, and are connected with the bottom of the nonlinear-level upper layer (1). The adjustable nonlinear double-layer vibration-isolating device has the characteristics of low dynamic stiffness and high static stiffness; the low-frequency band vibration-isolating effect of the vibration-isolating device can be greatly improved while the static stability of the vibration-isolating device is ensured; the negative stiffness of the vibration-isolating device can be accurately adjusted by controlling the current magnitude and the current direction of a coil, so that the dynamic stiffness of the vibration-isolating device can be accurately adjusted and the vibration-isolating performance of the vibration-isolating device can be quickly and accurately changed; in addition, the adjustable nonlinear double-layer vibration-isolating device adopts a double-layer vibration-isolating structure, so that the high-frequency band vibration-isolating capability of the vibration-isolating device is further improved.
Owner:NO 719 RES INST CHINA SHIPBUILDING IND
A Quasi-Zero Stiffness Vibration Isolator Using Multilayer Extruded Magnetic Springs and Swing Rods
ActiveCN108167362BLower natural frequencyCompact structureMagnetic springsDynamic stiffnessNegative stiffness
The invention discloses a quasi zero stiffness vibration isolator using multilayer squeezing type magnetic spring and oscillating bars. The vibration isolator comprises a main shaft, guiding shafts, the oscillating bars and a multiplayer structure; the multilayer structure comprises an upper roof arranged from top to bottom in sequence, an upper end cover, a negative stiffness unit, a lower end cover, positive stiffness unit and a bottom plate; the main shaft is a center shaft with multilayer structure; the guiding shafts and the oscillating bars are multiple, and are all arranged around the main shaft at fixing intervals; the structure is compact, and has more bearing ability under relatively small size. In addition, the negative stiffness unit and the positive stiffness unit are connected in parallel by the vibration isolator using the principle of magnetic negative stiffness; the vibration isolator has the characteristics of high static stiffness and low dynamic stiffness, the inherent frequency of the vibration isolator can be efficiently reduced, the vibration isolation frequency band is widened, and the vibration isolator is suitable for low frequency vibration isolation; thenegative stiffness unit is in the form of multilayer squeezing type magnetic spring, the stronger magnetic induction intensity can be produced, the negative stiffness of magnetic spring is increased,the negative stiffness unit is suitable for high loading occasion, and a wide range of applications is met.
Owner:SHANGHAI UNIV
A two-degree-of-freedom ultra-low frequency vibration isolator
ActiveCN106321707BRealization of ultra-low frequency vibration isolation with degrees of freedomVibration isolation achievedNon-rotating vibration suppressionSprings/dampers functional characteristicsAir springMarine engineering
Owner:HUAZHONG UNIV OF SCI & TECH
A kind of shock load mitigation device and method based on shape memory alloy
ActiveCN110469614BSmall phase transition critical stressHigh static stiffnessShock absorbersShock proofingVibration attenuationMartensite transformation
The invention discloses a shape memory alloy based impact load retarding device. The shape memory alloy based impact load retarding device comprises a shape memory alloy gasket, a shape memory alloy sleeve and a connector. The shape memory alloy sleeve is arranged between an upper connecting piece to be subjected to vibration attenuation and a lower connecting piece to be subjected to vibration attenuation. The connector comprises a nut and a connecting rod. The shape memory alloy gasket is used for being arranged on the upper connecting piece. One end of a rod body of the connecting rod is provided with a cap body. The rod body penetrates through the upper connecting piece, the sleeve, the lower connecting piece and the shape memory alloy gasket in sequence. The other end of the rod bodyis in threaded connection with the nut. The shape memory alloy gasket and the shape memory alloy sleeve are both in a martensite phase transformation critical stress state by tightening the nut. The invention further discloses an impact load retarding method of the shape memory alloy based impact load retarding device. Through the impact load retarding method, the assembly tightness of the upper connecting piece, the lower connecting piece and the connector is ensured, impact and vibration between the upper connecting piece and the lower connecting piece are reduced. Moreover, the shape memoryalloy based impact load retarding device is simple in structure and easy to dismantle.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Preparation method of anti-fatigue composite material plate spring
ActiveCN114479361AHigh strengthImprove fatigue lifeLeaf springsResilient suspensionsEpoxyGlass fiber
The invention discloses a preparation method of an anti-fatigue composite material plate spring. The preparation method comprises the steps of preparing modified S-type glass fibers, modifying epoxy resin and preparing the plate spring. The prepared composite material plate spring is high in strength, the tensile strength ranges from 1647 MPa to 1655 MPa, the compression strength ranges from 1269 MPa to 1278 MPa, and the bending strength ranges from 2251 MPa to 2267 MPa; the prepared composite material plate spring is long in fatigue life, and the fatigue life is 315,000-322,000 times.
Owner:山东莱蔚特复合材料有限责任公司
Non-linear press-rod spring device
InactiveCN100410561CImprove carrying capacityReduced carrying capacityNon-rotating vibration suppressionShock absorbersEngineeringBar pressing
Owner:HARBIN INST OF TECH
A state parameter acquisition device for electro-hydraulic servo control system
InactiveCN108626206BHigh precisionHigh static stiffnessFluid-pressure actuator testingFluid-pressure actuator componentsControl systemState parameter
The invention belongs to the field of electro-hydraulic control, and discloses a state parameter obtaining device used for an electro-hydraulic servo control system. The state parameter obtaining device comprises an acceleration sensor, a position speed sensor, a position giving controller, a position controller, a first-order differential controller, a second-order differential controller, a third-order differential controller, a speed controller, an acceleration controller and a system controller. The state parameter obtaining device performs real-time online acquisition on six state parameters which are displacement, speed, acceleration, displacement deviation, speed deviation and acceleration deviation of the electro-hydraulic servo system, and provides state parameters for the systemcontroller, and the system controller outputs a control signal to drive a hydraulic performing unit to work to improve control performance of the electro-hydraulic servo system according to differentcontrol strategies. The state parameter obtaining device is suitable for realizing controlling various electromechanical-hydraulic cooperative control systems through various state parameters.
Owner:TAIYUAN UNIV OF TECH
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