238results about "Friction dampers" patented technology

A composite damping device for vibration reduction of a tower drum and blades of an offshore wind turbine belongs to the technical field of vibration reduction of wind driven generators, and is characterized by comprising a blade integration unit and a tower drum tuning unit, the blade integration unit adopts a cylindrical particle damping cavity, the center of the cylinder is connected with a mass ball through a spring, and the cavity is filled with damping particles; the steel wire rope is fixed in the blade to restrain vibration displacement; the tower tube tuning unit is connected with the mass block through a steel wire rope, the mass block is circumferentially provided with the springs and connected with the tower tube wall, the lower portion of the mass block is connected with the mass ball, and the upper periphery and the lower periphery of the mass block are connected with the tower wall through the hydraulic inerter dampers. And the working space is obviously reduced, the multi-direction vibration control capability is improved, and the method is suitable for vibration control of offshore wind turbine towers and blades.

A damping shock absorber includes a pipe and a plurality of shock absorbers configured on the pipe. The shock absorber includes a main body sleeved on the outer periphery of the pipe and a damping medium filled in the main body. The main body is provided with an inner cavity, and the inner cavity is divided into a plurality of chambers for placing the damping medium separately. A method for designing the damping shock absorber, wherein the main body is filled with the damping medium, such that the shock of the pipe or a shaft body is reduced, ensuring the smooth operation of the pipe or the shaft body, and further ensuring the safety and efficiency of the pipe or the shaft body in a working process. The damage to the pipe or the shaft body and the shock interference to other linked apparatuses are greatly avoided.

The invention discloses a multi-pendulum-type particle tuned damper and a vibration reduction method thereof. The problems that a traditional tuned mass damper (TMD) is poor in robustness, narrow in vibration reduction frequency band and difficult to adapt to the complex and changeable vibration environment of an offshore wind power tower drum are solved. According to the damper, the supporting plate is hung through the flexible traction component to form a pendulum type tuned mass unit, the N-order inherent frequency of the pendulum type tuned mass unit is tuned to be matched with the N-order inherent frequency of a tower barrel, and efficient resonance energy absorption of main frequency vibration is achieved; meanwhile, the particle filling box is arranged on the supporting plate, the swinging type unit swings to drive particle materials to generate violent relative movement, and broadband vibration energy is widely dissipated through inelastic collision and friction. According to the application, the adaptability, the robustness and the overall vibration reduction efficiency of the damper in a severe marine environment can be remarkably improved.

An apparatus is provided. The apparatus includes an equipment support structure configured to support a semiconductor fabrication component. The apparatus includes a damper assembly configured to resist a lateral force induced by a seismic event to the equipment support structure. The damper assembly includes a gear rack coupled to the equipment support structure. The damper assembly includes a first flywheel assembly including a first mass damper flywheel and a first gear meshed with the gear rack and selectively engaged with the first mass damper flywheel.

The invention discloses a horizontal floating raft vibration isolation device, and belongs to the technical field of floating raft vibration isolation. The first vibration isolation assembly is detachably connected to the two sides of the lower end of the buoyant raft body through the fixing assembly, the first vibration isolation assembly is movably provided with a plurality of steel wire rope rings, and the first vibration isolation assembly isolates vibration through the steel wire rope rings; the second vibration isolation assembly comprises a plurality of anechoic tiles, the multiple anechoic tiles are glued to the upper end of the buoyant raft body, and multiple cavities are formed in the bottom faces of the multiple anechoic tiles; the third vibration isolation assembly is fixedly connected into the lower end of the buoyant raft body; the bottom of the first vibration isolation assembly and the bottom of the third vibration isolation assembly are both fixedly connected with the base. Multiple vibration isolation modes such as steel wire rope ring vibration isolation and anechoic tile vibration isolation are adopted for vibration isolation, and the vibration isolation effect is enhanced.

A power wheelchair includes a frame, a powertrain including a motor, gearbox, and powertrain suspension coupled to a drive wheel. The powertrain suspension includes a powertrain mount connected to the motor. The mount is pivotally connected to and resiliently supported by an upper link and a lower link for movement of the drive wheel relative to the frame. The power wheelchair further includes a base suspension connected between the frame and the caster support arms. The base suspension is dynamically controllable to vary caster suspension movements in response to sensor outputs to reduce pitching motions.

The application discloses a kind of discontinuous friction damper and its use method, belong to friction damper technical field, including damper pull rod, pull rod groove, limit hole, damper shell, damper cover, pin hole, connecting piece, fixed bolt, compression bolt, disc spring, guide bolt, pressure block, friction block, friction damper provided by the application can withstand large stroke and large tonnage, when tower crane faces sudden unloading working condition, damper initial operation provides damping force, buffer arm frame upwarp impact force, cancel damping force after a certain stroke, facilitate arm frame upwarp fast drop balance arm tail balance weight, after balance weight drop is completed, friction damper provides damping force, for arm frame continues to overturn under the action of inertia force provides certain resistance, to reduce arm frame upwarp displacement, prevent arm frame under the action of inertia force overturn from thereby causing arm frame drop dangerous.

The invention provides a friction damper which comprises a cuboid-shaped shell, a friction plate and a friction plate. The plane friction plate is arranged in the shell, an actuating rod and a limiting rod extend out of the end faces of the two sides, in the length direction of the shell, of the plane friction plate, at least one driver sleeve is arranged on the plane friction plate, and the driver sleeves vertically face the cover plate; the limiting plate is arranged on the inner wall of the bottom of the shell, and the limiting rod penetrates through the limiting plate; the resetting device comprises a first resetting device and a second resetting device, the limiting rod is sleeved with the first resetting device, and the actuating rod is sleeved with the second resetting device; the at least one piezoelectric ceramic driver is arranged on the plane friction plate, the axial direction of the piezoelectric ceramic driver is perpendicular to the inner wall of the bottom of the shell, a sliding mechanism is arranged at the top end of the piezoelectric ceramic driver, and the sliding mechanism is in sliding contact with the inner wall of the cover plate; and the connecting rod is fixedly arranged on the outer surface of the shell. The friction damper provided by the invention has a variable damping function.

The invention discloses a particle damping vibration absorption device applied to an airborne display module, which is characterized in that a particle damping vibration absorber unit is arranged on an airborne display unit, and the airborne display unit comprises a structural component, a liquid crystal screen component, an optical component, a circuit component and a backlight component, the structure assembly, the liquid crystal screen assembly, the optical assembly, the backlight assembly and the circuit assembly are arranged in sequence, and the man-machine interaction function can be achieved. According to the scheme, the particle damping vibration absorption device is simple in structure, particle damping vibration absorption is achieved by arranging the particle damping vibration absorber unit at the vibration response peak point on the airborne display unit, effective vibration absorption in the airborne severe environment is achieved through cooperation of an elastic element, damping particles and a damping pad in the particle damping vibration absorber unit, and the particle damping vibration absorption device is simple in structural form and convenient to use. The device has the characteristics of high reliability, simplicity and convenience in operation, easiness in maintenance, capability of meeting normal use in an airborne severe environment and the like, and can effectively reduce the vibration response peak value on the liquid crystal display screen.

The invention involves a triangular prismatic tuned mass damper suitable for large-span or cantilever structures, including a triangular prism box, particle damping units inside the triangular prism box, and a steel mass block. Below the triangular prism box are high-damping springs. The particle damping unit consists of a particle damping cavity, particles of three different sizes, and foam rubber pads. When the structural vibration amplitude is small, the particles dissipate energy by compressing the foam rubber pads and rolling. When the amplitude of structural vibration is large, the energy is dissipated by the collision of particles and the compression of the foam rubber.

A friction damper that is disposed between a pair of members which move relative to one another in a prescribed direction and suppresses said relative movement by means of frictional force between pressure contact plates that slide in conjunction with the relative movement, said friction damper comprising a first pressure contact plate integrally provided to one member among the pair of members, a second pressure contact plate integrally provided to the other member among the pair of members, and a fastening member that is inserted into a through hole in the first pressure contact plate and a through hole in the second pressure contact plate to press the first pressure contact and the second pressure contact into contact in the plate thickness direction, wherein: one through hole among the through hole in the first pressure contact plate and the through hole in the second pressure contact plate is an elongated hole that is elongated in the prescribed direction; the other through hole among the through hole in the first pressure contact plate and the through hole in the second pressure contact plate is a bolt hole; the fastening member has a bolt that is inserted through the elongated hole and the bolt hole, a nut that is threaded onto the bolt, and a pipe that accommodates the bolt and is accommodated in the elongated hole and the bolt hole; and when the friction damper is subjected to an axial force in the prescribed direction, the pipe contacts the short-diameter portion of the elongated hole to suppress buckling in an intersecting direction intersecting the prescribed direction and the plate-thickness direction.

The invention provides a foam structure, a display module and a display device, the foam structure comprises a plurality of foaming particles, the plurality of foaming particles comprise a first type of foaming particles and a second type of foaming particles, and in at least one direction, the particle size of the first type of foaming particles is larger than that of the second type of foaming particles; wherein at least part of the second type of foaming particles are wrapped by the first type of foaming particles, and / or at least part of the second type of foaming particles are located in gaps between every two adjacent first type of foaming particles. By increasing the volume of the first type of foaming particles and / or increasing the density of the foaming particles in the foam structure, the gap filling rate of the foaming particles in the foam structure can be increased, so that the strength of the foam structure is improved, and the external force extrusion resistance and the external force impact resistance of the foam structure are improved.

To provide a displacement-dependent damper which can be installed on a seismic isolation layer irrespective of the form of a seismic isolation bearing.SOLUTION: A displacement dependent damper includes: a lower shoe 2 which has a V-shaped recessed lower slide-contact face 23 on an upper face in an X-direction (a first direction), and which is fixed to an upper part of a lower structure 14 of a construction; an upper shoe 3 which has a V-shaped recessed upper slide-contact face 33 on a lower face in a Y-direction (a second direction) being orthogonal to the X-direction on a horizontal face, and which is fixed to a lower part of an upper structure 15 of the construction; a slider 4 having a lower slide-contact face which can slide with respect to the lower slide-contact face 23 in the X-direction and an upper slide-contact face 46 which can slide with respect to the upper slide-contact face in the second direction; and a compression spring 51 (an elastic member) which is disposed between the upper shoe 3 and the upper structure 15, and is elastically deformable in a vertical direction.SELECTED DRAWING: Figure 3

To provide a shock absorber capable of improving ride comfort on a vehicle by changing friction force according to the vibration states of a vehicle body.SOLUTION: A shock absorber D includes a shaft 1 rotatable in the peripheral direction, a first friction disc 2 fixed to the shaft 1, a second friction disc 3 for generating friction force between the first friction disc 2 and itself to suppress the rotation of the shaft 1, a third friction disc 4 for generating friction force between the first friction disc 2 and itself to suppress the rotation of the shaft 1, a first opposite member 5 non-rotatable in the peripheral direction and arranged on the counter first friction disc side of the second friction disc 3 in the axial direction, a second opposite member 6 non-rotatable in the peripheral direction and arranged on the counter first friction disc side of the third friction disc 4 in the axial direction, a first elastic body 7 connected to the first opposite member 5 and the second friction disc 3, and a second elastic body 8 connected to the second opposite member 6 and the third friction disc 4.SELECTED DRAWING: Figure 1

The utility model relates to the technical field of noise reduction nails, in particular to a hollow shock absorption and noise reduction nail structure. The hollow shock absorption and noise reduction nail structure comprises a nail body, an inner cavity is formed in the nail body, and a nail cap is installed at the tail of the nail body in a sliding connection mode. An inner cavity formed in the nail body is filled with metal sand and is provided with a steel ball, and the metal sand is distributed in the inner cavity on the two sides of the steel ball; a protruding part is arranged at the tail of the nail body, and a plurality of outwards-inclined inserting cavities distributed in an annular mode are formed in the protruding part. A plurality of annularly-distributed inserting pieces are fixedly embedded in the inner wall of the nail cap. According to the hollow shock-absorbing and noise-reducing nail structure, the nail cap is knocked by a hammer, so that the inserting column slides along the inner cavity and tightly compresses the metal sand, and the metal sand can be plastically deformed to absorb vibration energy, so that the metal sand on the two sides of the steel ball can be deformed and the impact amplitude on the steel ball is reduced; therefore, internal stress generated when the nail body is impacted is effectively reduced, and the effect of reducing noise generated when the nail body is knocked by a hammer is achieved.

The invention relates to a vibration and noise reduction assembly, a driving assembly and a vehicle, and relates to the technical field of vehicles, the vibration and noise reduction assembly is used for solving the problem of how to improve the vibration and noise reduction effect of the driving assembly, the vibration and noise reduction assembly comprises a supporting piece and damping particles, the supporting piece comprises an acoustic black hole part, and the acoustic black hole part is used for absorbing and attenuating vibration energy; the supporting piece is also provided with an accommodating cavity which is arranged at an interval with the acoustic black hole part; the damping particles are arranged in the containing cavity and used for dissipating vibration energy. The vibration and noise reduction assembly is used for reducing vibration and noise of the driving assembly.

The utility model relates to the technical field of medical instruments, in particular to a guide wire inserter with damping. The guide wire inserter with the damping function comprises a guide wire inserter body and a damping block, a conical guide wire channel opening is formed in the guide wire inserter body, a tip opening is formed in the left side of the guide wire inserter body, and a tail end opening is formed in the right side of the guide wire inserter body. The guide wire channel opening is communicated with the tip opening and the tail end opening of the guide wire inserter body, a damping block is integrally formed in the position, close to the tail end opening, in the guide wire inserter body in an inclined mode, and a connecting opening is formed by the inclined upwarp position of the damping block and the guide wire inserter body. According to the guide wire inserter, the damping block is arranged at the position, close to the tail end opening, of the guide wire channel opening, and when the guide wire exits from the tip opening of the guide wire inserter body, the damping block can automatically clamp the guide wire and generate certain resistance to the guide wire, so that the guide wire is prevented from falling off, and the stability and safety in the guide wire insertion process are effectively improved.

The application provides a salt mist corrosion resistant damper, which comprises a particle damper and a pad damper; the particle damper comprises a particle damper shell; an upper cover is arranged on the upper end of the particle damper shell; damping particles are arranged in the particle damper shell; the particle damper shell is fixed with a gas turbine generator set and various types of driving device chassis; the particle damper shell is connected with one end of a positioning screw rod, the positioning screw rod passes through an upper metal mesh pad and is connected with the pad damper; the positioning screw rod is sequentially connected with a base after passing through an intermediate shell, an outer ring metal mesh pad and an inner ring metal mesh pad in the pad damper; a transverse mesh pad is arranged between the intermediate shell and the base. The application can not only well consume the vibration energy of the full frequency band of the gas turbine generator set and various types of driving device on the offshore platform or land, but also can work stably for a long time in the high and low temperature and high salt mist environment.

This invention relates to a kind of displacement amplification self-centering friction damper. The device uses gears to convert the axial deformation into the rotation of the friction-disc, and the friction device engages in friction at the edge of the friction-disc, then the displacement can be amplified and therefore it can reduce the frictional force and prolong the service life of friction components. At the same time, through gear transmission, the friction force provided by the friction device can increase with the increase of relative displacement, then it can provide suitable energy dissipation capability under different working conditions. Additionally, the device can automatically return to its initial state by disc-spring, and also provides self-centering capability for the structure simultaneously, advantageous in reducing residual deformation of the structure under severe earthquake. Compared with existing technologies, this invention has a better energy dissipation effect and is suitable for vibration control in engineering structures.

This invention relates to a hydraulic amplification device based on a semi-circular friction damper, belonging to the field of vibration control technology. It includes a large pull plate, a damper connector, a semi-circular friction damper, a rack and pinion connector, a fisheye ball joint, a short pin, a long pin, a reversing lever, a piston rod, an upper barrel fixing component, an upper barrel receiving component, an upper barrel, a side plate, a lower plate, a guide tube, a reaction frame cover plate, a reaction frame vertical plate, a lower barrel, a base support, a pressure plate, a friction plate, a threaded cover, a rectangular brake pad, a fluororubber sheet, a piston head, a piston, and hydraulic oil. When the amplification device is under load, the semi-circular friction damper has no output force, the reversing lever and the hydraulic amplification part do not function, and the friction plate dissipates energy under its own weight. When the amplification device is under unload, the semi-circular friction damper generates damping force. This damping force is amplified once by the reversing lever and then amplified a second time by the hydraulic pressure in the upper and lower barrels, transforming into normal pressure at the friction plate, which, combined with the movement of the friction plate, generates frictional force.

The invention provides a stepless hovering rotating shaft based on a rubber pad friction pair, and relates to the field of machinery. The stepless hovering rotating shaft based on the rubber pad friction pair comprises a front support, a rear support, a rubber pad, a bolt, a gasket, a disc spring and a nut, the front support, the rear support, the rubber pad, the bolt, the gasket, the disc spring and the nut are fastened through the nut, the bolt sequentially penetrates through the front support, the rubber pad and the rear support, the front support is installed in a first shell, and the rear support is installed in a second shell. According to the stepless hovering rotating shaft based on the rubber pad friction pair, through the design of the rubber pad friction pair, direct contact of metal is avoided, abrasion and stick-slip phenomena are reduced, and stable and smooth damping torque is provided; stepless hovering in the true sense is achieved, and the position can be stably kept at any angle. The structure is simple, cost is low, and production and maintenance are easy; the environment adaptability is good, and the vibration resistance and the impact resistance are excellent; the service life of the product can be prolonged by replacing the rubber pad, and maintenance cost is reduced.

The invention discloses a vibration reduction base based on rigid supporting and frequency-division-band cooperative energy consumption and application thereof, and belongs to the technical field of vibration reduction and isolation of ship equipment. The vibration reduction base comprises a main body supporting structure, an energy consumption unit and a local resonance unit; the main body supporting structure is composed of an upper panel, a lower panel and an orthogonal rib plate support, the upper panel and the lower panel are parallel to each other, the orthogonal rib plate support is arranged between the upper panel and the lower panel, a cylindrical container is arranged in the center of the orthogonal rib plate, the orthogonal rib plate and the cylindrical container are integrally formed, and the central axis of the cylindrical container coincides with the crossed axis of the orthogonal rib plate; the energy consumption unit is positioned in the upper panel and the cylindrical container; the local resonance units are located in four independent spaces formed by the orthogonal rib plates; and the upper panel is connected with the lower panel. Low-frequency vibration energy is focused and blocked through the local resonance unit, meanwhile, the low-frequency focusing energy and medium-high frequency vibration energy are subjected to broadband energy efficient dissipation through the multi-stage particle damping system, and broadband cooperative efficient vibration reduction is achieved.

A clothes treating apparatus includes: a cabinet; a tub positioned inside the cabinet; a drum configured to rotate inside the tub; and a damper coupled to the cabinet and the tub and configured to reduce vibrations of the tub according to a rotation of the drum. The damper includes: a piston; a cylinder forming an inside space in which the piston is movable, the cylinder including a yoke and a bobbin positioned at one side of the yoke; and a friction member positioned between an outer surface of the piston and an inner surface of the cylinder and including a magneto-rheological fluid of which viscosity changes according to a magnetic field. A thickness of the friction member positioned between the piston and the bobbin is smaller than a thickness of the friction member positioned between the piston and the yoke.

The invention discloses a mechanical metamaterial with double negative equivalent parameters and a preparation method thereof, and relates to the technical field of mechanical metamaterial structures. The invention aims to solve the problems of insufficient controllability, designability, multi-scene adaptability and the like of the existing negative Poisson's ratio and negative stiffness metamaterial. The device comprises a plurality of unit cell layers which are sequentially arranged from bottom to top, each unit cell layer comprises a plurality of unit cells which are evenly distributed in a matrix shape, every two adjacent unit cells are fixedly connected through a connecting block, each unit cell comprises two cell elements which are oppositely and fixedly connected in the vertical direction, and each cell element comprises a polygonal frame, a fixing block and a plurality of connecting rods; the fixing block is arranged over the polygonal frame, the connecting rods are evenly distributed between the polygonal frame and the fixing block, the inner side of the upper end of each connecting rod is fixedly connected with the fixing block, and the outer side of the lower end of each connecting rod is fixedly connected with the middle of one frame of the polygonal frame. The method is used for mechanical metamaterial design.

A vibration damping component for a vehicle includes a housing, and a mounting lug attached to the housing. The mounting lug includes an outer shell with a top, a bottom, and sides. The mounting lug also includes a bore through the outer shell from the top to the bottom. The mounting lug also includes a cavity, an interior lattice, and a damping media. The outer shell and the bore enclose the cavity. The interior lattice is within the cavity and stiffens the mounting lug. The damping media is enclosed in the cavity and between solid portions of the interior lattice.

The invention pertains to the field of vehicle engineering and relates to friction shock-absorbers for vehicles, and primarily to shock-absorbing apparatus mountable between railway wagons. The aim of the invention is to improve the structure of a shock-absorbing apparatus such as to allow a more uniform distribution of load on the support surfaces of a pressure wedge device and on the stay surfaces of stay wedges. This aim is achieved in that a pressure wedge device and stay wedges, which together form a friction assembly of the shock-absorbing apparatus, are configured to provide for constant mutual contact under a main and an additional stay angle at any given extent of travel of the friction assembly, wherein the total area of the regions of the support surfaces of the pressure wedge device and of the stay surfaces of the stay wedges which lie inside the zones of mutual contact is not less than the total area of said support surfaces of the pressure wedge device and said stay surfaces of the stay wedges which lie outside the zones of mutual contact. A spring device is configured and mounted in such a way that in its fully compressed state at its maximum extent of travel, it provides a force applied to the friction assembly and the bottom of a housing which is greater than 120 tons. Other elements of the invention are also described.

The particle damper comprises a vibration reduction part and a connecting part, the vibration reduction part comprises a vibration reduction box and a plugging piece, the vibration reduction box is provided with a containing cavity and a material filling opening communicated with the containing cavity, the containing cavity is used for containing vibration reduction particles, the vibration reduction particles are contained in the containing cavity from the material filling opening, and the plugging piece is detachably connected with the vibration reduction box. The plugging piece is used for plugging the filling port; the connecting part is connected with the vibration reduction box and used for being connected with a structure to be subjected to vibration reduction. According to the scheme, the plugging piece is used for plugging the material filling opening, the plugging piece is detachably connected with the vibration reduction box, the vibration reduction particles can be conveniently placed in and replaced, and meanwhile the vibration reduction particles can be placed at any time when used. In other words, the vibration reduction particles do not need to be connected with the structure to be subjected to vibration reduction together with the particle damper, and therefore the problem that when the particle damper is connected with the structure to be subjected to vibration reduction in a welding mode, high temperature generated by welding enables the vibration reduction particles in the containing cavity to be connected into a whole, and vibration reduction of the particle damper fails is solved.

The application provides a self-resetting friction damper and a use method thereof, which comprises a cylinder body, an extrusion buffer assembly is arranged on the inner side of the cylinder body, a reset buffer assembly is arranged on the bottom of the cylinder body, the extrusion buffer assembly comprises a piston rod and a piston, the piston is slidably connected in the cylinder body, and the bottom of the piston rod is located on the outer side of the cylinder body. When the piston rod moves, the piston is driven to move, the piston moves to compress the disc spring on one side and stretch the disc spring on the other side, and the elastic metal rod is compressed, so that the vibration acting on the piston rod is absorbed, and the piston rod is reset through the reaction force of the disc spring and the elastic metal rod after absorbing the vibration. When the piston rod moves left and right, the disc spring and the piston will extrude the friction ring, the vibration is further absorbed through the friction ring, and the reaction force generated when the piston rod is reset can be absorbed, so that the problem that the reaction force affects the damping effect when resetting is solved.