313 results about "Viscoelastic damping" patented technology

A piezoelectric actuated suspension with passive damping is disclosed for precision positioning of hard disk drive while reducing undesired shock vibrations. Along the longitudinal axis of an etched suspension, two piezoelectric actuators dispose near the base plate to provide a push-pull motion. The actuators have two main portions. The first portion is piezoelectric elements to provide active positioning. The second portion is viscoelastic damping layers underneath the piezoelectric elements for passive damping. The complementary parts such as stiff edge elements and optional soft boundary covers are used to enhance the actuating abilities of the actuators and prevent any contaminants of the viscoelastic layers from going into the clean sealed chamber of the hard disk drive, respectively. The present invention further relates to a dual-stage servo system in a hard disk drive for fine positioning of the read/write head and better shock resistance via the piezoelectric actuated suspension with passive damping.

The invention belongs to the field of wind power generation, in particular to a damping composite type variable rigidity vibration attenuating support for a gearbox of a wind powered generator. The support mainly comprises an upper yoke (1), a lower yoke (3), four hollow vertical columns (2), an upper elastic body (4), a lower elastic body (4), an upper base (5) and a lower base (5), wherein the upper yoke (1), the lower yoke (3) and the four hollow vertical columns (2) form a combined type main frame of the vibration attenuating support; a viscoelastic damping vibration attenuating layer (11) is compounded on the main frame; after being respectively combined with the upper base (5) and the lower base (5), the upper elastic body (4) and the lower elastic body (4) are respectively fixed on the upper yoke (1) and the lower yoke (3); the vibration attenuating support is connected to the main machine frame (6), and a gearbox torque arm (9) is arranged between the upper elastic body and the lower elastic body. The invention has the characteristics of light dead weight and low cost, the rigidity of the vibration attenuating support can form a non-linear change along with the increase of loads, and the vibration attenuating support has damping attenuation capability and further reduces the transfer of the vibration and the noise of a system to a lower foundation.

The invention discloses a composite three-dimensional shock isolation support of a sandwich rubber-high damping disc spring. The composite three-dimensional shock isolation support of the sandwich rubber-high damping disc spring comprises a horizontal shock isolation support, a disc spring vertical shock isolator, a guide rod, a cylindrical viscoelastic damping layer, an external cylindrical vertical connection steel plate, an internal cylindrical vertical connection steel plate, a lower connecting plate, a middle connecting plate and an upper connecting plate. The composite three-dimensional shock isolation support of the sandwich rubber-high damping disc spring isolates horizontal earthquakes through the horizontal shock isolation support, improves certain damping, and reduces vibration of a structure under the effects of the horizontal earthquakes. The disc spring vertical shock isolator isolates vertical earthquakes, the cylindrical viscoelastic damping layer increases damping of the shock isolation support under the effects of the vertical earthquakes, vertical earthquake energy transmitted to the structure by the earthquakes is consumed, and swing of the structure under the effects of the vertical earthquakes is reduced.

The invention discloses an embedded type high-temperature co-curing high-damping composite material. The embedded type high-temperature co-curing high-damping composite material comprises the following components in parts by weight: 92.5-93.5 parts of butyl rubber, 6.5-7.5 parts of chlorinated butyl rubber, 2.9-3.1 parts of chlorinated polyethylene, 3.9-4.1 parts of zinc oxide, 0.8-1 parts of stearic acid, 50-52 parts of carbon black and 5.9-6.1 parts of octyl phenolic resin. The invention also discloses a preparation method of the composite material. According to the method, the mixture of the butyl rubber and the chlorinated butyl rubber is taken as a main material, the mixture is dissolved in an organic solvent to be prepared into unvulcanized visco-elasticity damping material solution, the unvulcanized visco-elasticity damping material is brushed and coated on the prepreg surface of the composite material, by adopting a brush-coating method or/and spray-coating method, a damping layer is embedded in the structure of the composite material by being taken as a specific paving layer and then is processed into a damping-structure member of the embedded composite material by a co-curing process curve, and the damping-structure member of the embedded composite material has a wide application prospect in the high-tech fields such as high speed trains, aviation, aerospace and the like.

The invention discloses a water-based viscous-elastic damping sound-insulation adhesive, comprising 40-80 wt% of emulsion aclylate pressure-sensitive adhesive, 0-10 wt% of polyacrylate copolymer, 0-15 wt% of filling material, 0-10 wt% of tackifier, 0.3-2 wt% of surfactant, 0.1-0.5 wt% of antifoaming agent, 1-4.0 wt% of fire retardant, 12-40 wt% of water, and 0.05-0.3 wt% of bactericide, wherein the summation of the weight percentages of all the ingredient is 100 wt%. The water-based viscous-elastic damping sound-insulation adhesive belongs to an environment-friendly type adhesive, has no toxicity and no harm, is friendly to human body and environment, has high damping value, wide temperature range, and strong caking property, can form a damping platform with a damping value of more than 0.9 and a temperature range of more than 100 DEG C, has a T-peel strength of larger than 31 N/cm, and has the dual effects of sound insulation and caking.

The invention relates to the technical field of civil engineering, in particular to a damper and a manufacturing method thereof. A high-damping rubber fluid viscoelastic damper comprises a steel plate layer and a fluid viscoelastic material layer, wherein the steel plate layer comprises a middle steel plate and side steel plates arranged at two sides of the middle steel plate, the fluid viscoelastic material layer is arranged between the steel plate layer and the side steel plates, and the fluid viscoelastic material layer is the high-damping rubber fluid viscoelastic material layer made of high-damping rubber fluid viscoelastic material. Due to the adoption of the technical scheme, the invention has the following advantages: the vibration energy can be absorbed effectively by the deformation of the high-damping rubber fluid viscoelastic material, a hysteresis ring is full, and the fatigue resistance is good; and compared with the traditional fluid viscoelastic damper, the energy consumption property has stronger nonlinearity, and the energy consumption property is good under the condition of extremely small displacement and extremely low speed.

The invention discloses a building structure foundation module having three-dimensional shock isolation and vibration attenuation functions. The building structure foundation module mainly comprises asteel structure small platform, a sliding support, a variable vertical stiffness combination laminated special rubber/steel plate support having a vertical self-regulating deformation capability, andviscoelastic damping energy absorption shock absorbers, wherein the centers of the viscoelastic damping energy absorption shock absorbers are connected in parallel; the sliding support uses an oily self-lubricating liquid phase-solid phase material, the coefficient of sliding friction is relatively low, the horizontal seismic component is effectively stopped from transferring to an upper structure, the shock absorber and a liquid/solid special rubber support having a damping characteristic are connected together in parallel and have a vibration attenuation effect, so that the effects of three-dimensional shock isolation, vibration attenuation and protection are achieved. The technical scheme has more sensitive and efficient actions on the earthquake.

The invention discloses a viscoelastic-mild steel shear-type combined energy consumer which comprises a viscoelastic damper and a shear energy-consuming combined panel; the shear energy-consuming combined panel comprises a horizontal division board, an energy-consuming web and a connecting end plate; the horizontal division board and the connecting end plate are respectively arranged on the upper end and the lower end of the energy-consuming web fixedly; and the viscoelastic damper is arranged on the horizontal division board, and comprises a U-shaped cover plate and a viscoelastic damping interlayer which is arranged between the U-shaped cover plate and the horizontal division board. The viscoelastic damper and the hear energy-consuming combined panel work collaboratively, the damage to a main structure is reduced by shearing the vibration energy in a hysteresis deformation dissipation input structure, so that the purposes of controlling wind vibration and absorbing shock are achieved simultaneously.

The invention relates to a vibration damper, in particular to a viscous damper taking a viscous substance as a vibration damping medium. End covers at the two ends of a cylinder (1) of the damper are elastic bodies (5); the two elastic bodies (5), the cylinder (1) and a piston rod (3) are vulcanized into a whole at high temperature; the elastic body (5) consists of an annular viscoelastic material layer (5-1) and an annular sheet steel layer (5-2) which are alternately laminated and vulcanized at high temperature; and the ratio of the diameter to width of the elastic body (5) is 2 to 4. In the damper of the invention, the elastic bodies (5) at the two ends of the cylinder (1), the cylinder (1) and the piston rod (3) are vulcanized into a whole to form a viscoelastic damper, so that the initial rigidity of the whole damper is remarkably improved.

The invention discloses a method for vibration absorption and noise reduction of steel rails by self-attraction type combined magnetic damping sheets, which comprises the following steps: a rail web and a rail foot of a steel rail (1) are symmetrically provided with the combined magnetic damping sheets (2); the outer layers of the combined magnetic damping sheets are symmetrically provided with constraint metal plates (3) which are fixed at both sides of the steel rail by a U-shaped magazine clip (4); the combined magnetic damping sheets have the magnetism and are attracted on the side surfaces of the steel rail; related interfaces inside the combined magnetic damping sheets and between the combined magnetic damping sheets and the steel rail as well as between the combined magnetic damping sheets and the constraint metal plates can cause vibration friction and slide relatively during the vibration of the steel rail; the mechanical energy of the vibration is converted into thermal energy to be dissipated to eliminate the vibration energy or the vibration amplitude of the steel rail; and the combined magnetic damping sheets and the steel rail are not adhered, so the viscoelastic damping mechanism is lost, which ensures that the range of the vibration frequency is wider, the temperature change has smaller influence, and good vibration absorption and noise reduction effects exist in a wider range of frequency domain and temperature domain. The method has convenient installation and replacement, and obvious vibration absorption and noise reduction effects, and can be widely used for vibration absorption and noise reduction engineering of track traffic.

The invention relates to the field of energy dissipation and vibration damping control of architecture structures, particularly to an assembly-type viscoelastic damping wall. The damping wall includes a middle steel plate, viscous-elastic material layers, two outside steel plates, an upper portion wall connecting steel plate, backing boards and two lower portion wall connecting steel plates, wherein the middle steel plate, the viscous-elastic material layers and the two outside steel plates are bonded together, the viscous-elastic material layers are respectively arranged between the middle steel plate and the two outside steel plates, the viscous-elastic materials are high attenuation rubber series viscous-elastic materials, and the viscous-elastic material layers are respectively firmly and reliably bonded with the middle steel plate and the two outside steel plates by utilizing a rubber and steel plate bonding process. The two outside steel plates, the upper portion wall connecting steel plate and the backing boards are firmly connected together through high-strength bolts, and the middle steel plate and the two lower portion wall connecting steel plates are firmly connected together through high-strength bolts. The assembly-type viscoelastic damping wall is high in energy-dissipating capacity, can provide relatively more use space for the architecture structures, facilitates installation and maintenance and meets the requirements of the design and functionality of the architecture structures.

An improved vibration damping system is provided for use with window structures. The window damping system employs both air-film damping technology and viscoelastic damping materials to increase mechanical and/or acoustic vibration damping in window structures.

The invention provides a preparation method of a co-cured high damping composite material, which greatly improves the damping performance of a resin base composite materials under the condition that the strength and the rigidity are ensured. The method comprises the following steps: taking nitrile-butadiene rubber with the thickness of 0.3mm as a viscoelastic damping material, and T700 carbon fiber/16 layers of epoxy resin as the prepreg of the composite material; laying the nitrile-butadiene rubber layer between the eighth layer and the ninth layer of the prepreg of the composite material; carrying out autoclave process on the nitrile-butadiene rubber layer and the prepreg of the composite material; setting the temperature and pressure according the curing condition of the epoxy resin; and co-curing to obtain the high damping composite material. The invention has the beneficial effects that the damping performance of the composite material is effectively improved under the condition that the strength and the rigidity of the composite material are ensured; the damping material is not easy to peel in the process of use; and the mechanical properties and the forming process of the resin base composite materials are not influenced.

The invention relates to an infrastructure large-load multidirectional vibration isolation and reduction device and a disaster prevention method thereof. The device comprises an upper end cover, a base, a vertical vibration reduction part, horizontal vibration reduction parts and the like. Under the action of a vertical load, a pressing cylinder of the upper end cover of the device extrudes a belleville spring of the vertical vibration reduction part, a pressing shaft extrudes energy dissipation and vibration reduction blocks of the vertical vibration reduction part, and the belleville springand the energy dissipation and vibration reduction blocks isolate and consume vibration in the vertical direction together. The base is provided with a limiting table to ensure that the vertical displacement of a main structure is within an allowable range. Under the action of horizontal earthquakes, viscoelastic damping materials of the horizontal vibration reduction parts plays a role in energydissipation and damping through compressive deformation. Under the action of torsion or eccentricity, oblique force transmission units ensure that the device does not roll over or overturn through thespatial arrangement of the oblique force transmission units. The device has the advantages of being large in bearing capacity, high in damping and capable of achieving multi-direction vibration isolation and reduction, and good energy dissipation capacity is provided for the device through the use of the energy dissipation vibration reduction blocks.

The invention relates to an underground railway tunnel structure and specifically relates to a vibration damping and noise reduction protection tunnel spraying a damping constrained structure and a construction method thereof.. The vibration damping protection tunnel with the constrained damping structure, disclosed by the invention, comprises a tunnel preliminary supporting concrete layer, wherein a viscoelastic damping layer is laid on the tunnel preliminary supporting concrete layer, and a secondary lining concrete layer is arranged on the surface of the viscoelastic damping layer. In the vibration damping protection tunnel disclosed by the invention, the vibration damping and protection structure integrates multiple functions and takes damping, vibration damping and noise reduction functions as main functions; and simultaneously, a waterproof function, an anti-corrosion function, an insulation function and other functions are further provided, waterproofness and leakage problems of the tunnel are solved, the durability of a whole underground structure is improved, stray current in a subway is isolated and the safety of traffic and staff can be ensured.

The invention discloses a manufacturing process of a composite material laying tape of an embedded co-curing continuous presoaking damping film. The manufacturing process comprises the following steps: 1) preparing raw materials; 2) preparing gross rubber; 3) preparing viscoelastic damping material solution; 4) conducting presoaking process of at least once for a presoaking material of a composite material by utilizing a viscoelastic damping material prepared in the step 3) to produce the presoaking material of the composite material with a damping film; meanwhile, utilizing a wet-type drying process or a process combining wet-type drying with dry-type drying for change No.120 gasoline into gaseous gasoline, cooling the mixture of the gaseous gasoline and steam through a heat exchanger, and then sending the cooled oil-water mixture into an oil-water separator to separate and recycle the No.120 gasoline; and 5) embedding the presoaking material of the composite material with the damping film manufactured in the step 4) into a composite material structure as a specific laying layer, placing the mixture into a vacuum bag of a hot pressing tank together, and highly vacuumizing so as to complete the preparation of an embedded co-curing composite material damping structure workpiece by using a co-curing process.

A lever viscoelastic damping wall assembly includes a first wall, a second wall and a viscoelastic damper. The first and second walls are connected respectively to a first structural member and a second structural member. The viscoelastic damper includes a swing rod connected pivotally to the first and second walls, a first viscoelastic unit connected between the first wall and an end portion of the swing rod, and a second viscoelastic unit connected between the second wall and an opposite end portion of the swing rod. The swing rod is driven to pivot relative to the first and second walls, and to thereby generate shear deformations of the first and second viscoelastic units to damp a relative movement between the first and second structural members.

A piping system for visco elastic damping, which system oscillates with high frequency, small amplitude oscillations. The system includes one or more autonomous visco elastic dampers that includes one or more layers of visco elastic damping material fixedly bonded between stiff members. The visco elastic dampers may be provided with a temperature controlling element.

A hand-held power tool for percussively driving a working tool (3) includes a percussion mechanism (4) having a guide tube (5), in which a percussion piston (7) which is driven by an air spring (6), is axially displaceable for applying axial impacts to an anvil (8) that applies axial blows to the working tool (3), and a viscoelastic damping member (9) arranged in the guide tube (5) and engaging in a circumferential radial groove (13) of the anvil (8) and which is axially limited at opposite sides thereof.

The invention provides a foamed aluminum and viscoelastic damping composite material and a preparation method. The preparation method comprises the following steps: an emulsion or a premixed solution of a viscoelastic damping material is put into a mold; pored foamed aluminum is totally or partially immersed in the emulsion or a premixed solution of the viscoelastic damping material to ensure that the viscoelastic damping material can totally or partially permeate into inner pores in pored foamed aluminum in a dispersively embedded manner; after curing, the composite material adopting the structure that the pores in pored foamed aluminum are filled with the viscoelastic damping material is formed. The composite material has the advantages that pored foamed aluminum is adopted for a compositing process, so that the viscoelastic damping material can be sufficiently immersed in the interior of foamed aluminum, foamed aluminum and viscoelastic damping material composite layers as well as foamed aluminum and viscoelastic damping material combined layers are formed in a composite structure, the effect of vibration reduction can be better, the characteristics of both light weight and high damping are realized, and the mechanical property is excellent; the composite material is suitable for being laid on a floor, a cabin, a wallboard, the external surface of a machine and the like, and can be directly utilized in a supporting structure requiring low strength.

The invention discloses a high-damping composite stay cable based on carbon fibers and steel strands, and relates to the field of stay cables. The high-damping combined stay cable comprises a core layer, 2-4 composite layers and 1-2 layers of sheaths which are arranged in sequence from inside to outside, wherein a sticky elastic damping material is filled between the core layer and each composite layer; the core layer consists of a plurality of high-intensity steel strands which are tightly arrayed; the composite layers consist of a plurality of composite fibers which are tightly arrayed; the adjacent composite layers are tightly attached; the composite fibers are prepared from a high-intensity steel wire and six carbon fibers; the six carbon fibers wrap the periphery of the high-intensity steel wire and are twisted to form a whole. Vibration attenuation of the stay cable can be accelerated, and the wind-resistant stability of an ultralong stay cable is effectively improved; the weight of the stay cable is reduced, and the transverse shear strength of the stay cable is guaranteed; furthermore, single-cable transportation and cable hanging can be realized, and the ultralong stay cable construction difficulty is reduced.

The invention relates to a viscoelastic damper capable of intelligently controlling damping force and discloses a viscoelastic damper capable of adaptively adjusting shearing rigidity and damping. The damper mainly comprises a magnetic component, a controller (7) and a sensor (8), wherein the magnetic component forms a complete closed magnetic circuit, provides magnetic energy input through a coil and changes magnetic flux density in the magnetic circuit by changing current in the coil; and the controller (7) is connected with the sensor (8) and a coil winding (4) of the magnetic component through a data line respectively. A temperature softening effect of the common viscoelastic material is made up by utilizing a rheological effect of a magnetized damping layer, so that reduced energy storage modulus of the viscoelastic material due to temperature rise can be compensated by adding an external magnetic field; and compared with the traditional viscoelastic damper, the damper can intelligently control the damping force according to the need and has a good control effect.

The invention discloses a viscoelastic damping magnetorheological elastomer material, which is characterized by being prepared by blending 100 parts of rubber substrate, 365 to 569 parts of magnetic particles, 0 to 110 parts of reinforcing system, 12 to 15 parts of vulcanizing system, 2 to 6 parts of anti-aging system, an operating assistant and a processing assistant. The viscoelastic damping magnetorheological elastomer material of the invention has high frequency shift property and energy consumption property in a service environment with the magnetic field intensity of 0 to 1,000mT, frequency of 0.1 to 50Hz and temperature of 20 DEG C below zero and 50 DEG C. And when a loss factor is between 0.5 and 0.9, the viscoelastic damping magnetorheological elastomer material can be used for making various intelligent shock isolating and absorbing devices.