143results about How to "High damping efficiency" patented technology

The invention discloses a magnetic liquid damping shock absorber with an arc-shaped inner wall axial section, which is suitable for shock absorption for a long object in a spacecraft. The device comprises a non-magnetic-conducting shell (1), a bolt (2), a nut (3), a permanent magnet (4), a magnetic liquid (5), a non-magnetic housing (6), an O-shaped ring (7), air hole (8), a shell inner wall surface (9) with an arc-shaped inner wall axial section, an air hole (10) and an interlayer air gap (11), wherein connection among the various portions above is as follows: the permanent magnet (4) is installed in the non-magnetic-conducting shell (1), the magnetic liquid is coated on the permanent magnet (4), and the non-magnetic housing (6) and the non-magnetic-conducting shell (1) are sealed by the O-shaped ring (7), and rigidly connected by the bolt (2) and the nut (3); the inner wall axial section of the non-magnetic-conducting shell (1) is arc-shaped, and the corresponding central angle theta is 1-15 degrees. The device is quite sensitive to an inertia force, and capable of carrying out effective shock absorption on shock with the characteristics of a low frequency, a small displacement and a low accelerated speed.

A combustion device (1) for a gas turbine includes portions (12) having an inner and an outer wall (13, 14) with an interposed noise absorption plate (15) having a plurality of holes (16). The combustion device (1) further has first passages (17) connecting zones between the inner wall (13) and the plate (15) to the inside of the combustion device (1) and second passages (21) for cooling the inner wall (13). The portions (12) also have an inner layer (22) between the inner wall (13) and the plate (15) defining inner chambers (23), each connected to at least a first passage (17), and an outer layer (24) between the outer wall (14) and the plate (15) defining outer chambers (25) connected to the inner chambers (23) via the holes (16) of the plate (15).

The invention discloses a flexible hanging type module building structure which comprises a vertical core cylinder structure. A conversion layer is arranged at the upper end of the core cylinder structure. A plurality of modules with certain spaces reserved in between are hung below the conversion layer. Every two modules adjacent in the vertical direction are connected through a set of hanging rods. The upper end of each hanging rod is movably connected to a ceiling beam of the corresponding upper module. The lower end of each hanging rod is movably connected to a ceiling beam of the corresponding lower module. The hanging rod arranged on the uppermost module is movably connected with the conversion layer. Dampers are arranged between floors of all the modules and the core cylinder structure. By means of the hanging shock absorption technology, the horizontal loads input by the modules to the core cylinder structure are remarkably reduced, and the material consumption of the core cylinder structure is saved. A module building allows substructure interlayer displacement, non-structural elements are prevented from damage, the limit value of substructure interlayer displacement is loosened, and then energy dissipation and shock absorption efficiency is improved. Through the combination of a limiting and buffering device, relative movement between the modules is controlled, and collision is avoided.

The damping device comprises a cluster of resonators with a predetermined frequency distribution, that, when attached to a main or “master” structure, is capable of absorbing irreversibly its vibrational or/and acoustic energy produced by a vi 5 brating body. the density of natural frequencies of the plurality of resonators is comprised within a curve that lies below the envelope curve determined by the formula, e( )=1/−1.

The invention discloses an elastic vibration-reduction ballast bed system, which comprises a concrete ballast bed and a low-frequency vibration isolator installed in the concrete ballast bed. An elastic mechanism in the low-frequency vibration isolator consists of a positive stiffness elastic element made of metal rubber or the positive stiffness elastic element and a negative stiffness elastic element which are connected in parallel. The positive stiffness elastic element is a disc spring, a spiral spring, the metal rubber, a metal rubber-spring armour, a metal rubber-lead core composite spring or any series-parallel combination of the disc spring, the spiral spring, the metal rubber, the metal rubber-spring armour and the metal rubber-lead core composite spring. The negative stiffness elastic element is a disc spring or a diaphragm spring. The elastic vibration-reduction ballast bed system can meet requirements of middle-high-grade vibration reduction and has a simple structure. The site construction process is simple and convenient, and consumed materials of the ballast bed are relatively reduced. Therefore, the elastic vibration-reduction ballast bed system is low in construction cost and suitable for popularization and application in the whole line.

The invention discloses a vibration reduction bearing device. The vibration reduction bearing device comprises a bearing seat fixed on the ground; a rubber gasket and a spring matched with the rubber gasket are arranged on the top of the bearing seat from top to bottom sequentially, and the stretching and retracting direction of the spring is consistent with the vertical direction. The rubber gasket and the spring can be matched mutually to form a double-stage vibration reduction structure, so that the vibration reduction capacity of the vibration reduction bearing device is greatly enhanced, and the vibration reduction efficiency of the vibration reduction bearing device is greatly improved; and the stretching and retracting direction of the spring is consistent with the vertical direction to ensure that the cushioning and vibration reduction effect generated by the stretching and retraction of the spring during stressing is maximized, so that the vibration reduction efficiency of the vibration reduction bearing device is further improved. The invention also discloses vibratory stress relief equipment applying the vibration reduction bearing device. Little vibration and noise generated by the vibratory stress relief equipment is spread, and the working process of the vibratory stress relief equipment is more environmental-friendly and efficient.

The invention relates to a vibration damper for a photonic crystal with an adjustable cell property period array. According to the vibration damper, the influence of a photonic crystal weak joint interface (or interface layer) on a band gap is considered, the controllability of physical and mechanics parameters under magnetorheological elastomers field conditions is utilized, an appropriate mechanism is built, and a controllable cell material physical property and interface layer geometrical parameters are obtained, so that the random vibration control photonic crystal variable band gap range suitable for multiple working condition control structure system obtained in a photonic crystal mechanism is realized, and the vibration damping efficiency of structural vibration control is improved.

A waterlogged sponge energy absorption and vibration attenuation device comprises a water tank, a plurality of partition plates and sponges, wherein the water tank is divided into a plurality of blocks by the partition plates, through holes are formed in the bottoms of the partition plates, and the blocks are filled with the sponges. Compared with a traditional tuned liquid damper, the waterlogged sponge energy absorption and vibration attenuation device has the advantages that water flows back and forth in pores of the sponges in the process of fluctuation, the friction resistance is larger, and vibration attenuation efficiency is higher due to particularities, namely, the porosities, of the sponges in structure; meanwhile, due to the water absorption effect of the sponges, the water in the vibration attenuation water tank can not splash because of fluctuation, the water tank is filled with the water, and the water tank space can be utilized more effectively.

A damping alloy member 1 is constructed in such a manner that the improvement consists of a twin crystal type damping alloy made of Cu—Al—Mn alloy, Mg—Zr alloy, Mn—Cu alloy, Mn—Cu—Ni—Fe alloy, Cu—Al—Ni alloy, Ti—Ni alloy, Al—Zn alloy, Cu—Zn—Al alloy, Mg alloy, Cu—Si alloy, Fe—Mn—Si alloy, Fe—Ni—Co—Ti alloy, Fe—Ni—C alloy, Fe—Cr—Ni—Mn—Si—Co alloy and Ni—Al alloy, and has a shape of a flake, a wire or a spring for optimizing a deformation of the alloy. Moreover, a rubber vibration isolator, a floor vibration damping apparatus, a tire, a steel cord and a quake-absorbing rubber are constructed by using the damping apply member.

A decoupling device for a driving disc which, for torque transmitting purposes, is connected to a driveshaft via a torsion spring, wherein the end of the driveshaft is provided in the form of a hollow shaft, wherein the torsion spring is bar-shaped and by means of one end is secured in a rotationally fast way in the driveshaft and by means of the other end is secured at the driving disc, and wherein a bearing sleeve is freely rotatably supported relative to the free end of the hollow shaft is firmly connected to the driving disc.

The invention discloses an efficient driven vibration insulation and reduction platform imitating the physiological structure of the head of a woodpecker. The efficient driven vibration insulation and reduction platform comprises a driven vibration-reduction assembly, a variable-stiffness various-damping air spring assembly, a combination bearing platform and an outer frame, the driven vibration-reduction assembly comprises a hard rubber pad and a cutting type viscoelastic damper, the variable-stiffness various-damping air spring assembly comprises two or more than two double-air-chamber air springs which are symmetrically distributed along a machine base, the combination bearing platform comprises a top board, a bottom board and side boards, wherein the top board, the bottom board and the side boards are made of steel boards, insulation layers are arranged among the top board, the bottom board and the side boards, and the outer frame is symmetrically arranged on two sides of the machine base. The efficient driven vibration insulation and reduction platform imitating the physiological structure of the head of the woodpecker has no acting part and is low in energy consumption. Compared with a vibration-reduction platform under driving control, the efficient driven vibration insulation and reduction platform can greatly lower manufacturing cost and operation cost, save energy, and be economical and practical.

The invention discloses a double-layer circular-tube type axial-force eddy current damper, which consists of an eddy current damping system, a guiding system and a connecting system, wherein the eddy current damping system is composed of a circular magnet and a double-layer circular tube, the double-layer circular tube comprises an outer circular tube made of strong magnetic-conducting material and an inner circular tube made of strong electricity-conducting magnetic-isolating material through nesting; the guiding system consists of a guiding ring, an inner guiding shaft and a hollow round support column, has inner-layer and outer-layer guiding functions, and also can have one guiding function according to the condition; and the connecting system is composed of a connecting block at the upper end of the double-layer circular tube and a support base at the lower end of the circular magnet. With the adoption of the specific double-layer circular tube design, the damper is only provided with one group of circular magnets on the inner side of an electric conductor tube, all magnetic-force lines can vertically cut the circular tube in the electric conductor and cannot be distributed outside the double-layer circular tube, and achieves the purposes of improving the eddy current efficiency and shielding the magnetic field outwards.

An organohybrid-based damping material for controlling unwanted vibration and noise, an organic damping improver exhibiting piezoelectric, dielectric and electroconductive effects, and their producing methods, are provided. The damping material comprises a polymer matrix having a polar side chain and a damping improver composed of a compound containing basic nitrogen and a phenol-based compound. The damping material shows an excellent damping properties, alleviates the functional deterioration, and is applicable to different application temperature regions and wide areas.

The invention discloses a three-way viscoelastic damper, which mainly comprises a ball head spindle, a ball seat, a shell and a damping layer and the like. Through relative motion of a ball head, the ball seat and the shell, viscoelastic materials are subjected to shear deformation, so that the mechanical vibration energy is dissipated, and a damping aim is fulfilled. By the three-way viscoelastic damper, three-way damping can be realized, and the three-way viscoelastic damper has the advantages of simple structure, convenience in assembly, wide application range and the like.

An oscillation damper may comprise a suspension having a suspension length. The oscillation damper may comprise a pendulum which may be suspended by the suspension and may have a pendulum mass. The pendulum may comprise a fixed part which may have a side face. The pendulum may comprise a slideable part for collision with a movement limiter. The slideable part may be a substantial portion of the pendulum mass. The slideable part may comprise one or more stacked plates which may be positioned on the fixed part, and the one or more plates may extend beyond the side face. The oscillation damper may comprise a movement limiter. The movement limiter may face the pendulum.

The invention discloses a two-stage air floatation type vibration reduction high-low temperature chamber accompanying system. The accompanying system comprises a primary vibration reduction device, asecondary vibration isolation air floatation support frame, a secondary vibration reduction device, a test pillar and a high-low temperature chamber shell, wherein the primary vibration reduction device comprises a primary vibration reduction air spring unit and a primary vibration reduction rigid platform arranged on the primary vibration reduction air spring unit; the secondary vibration reduction device comprises a secondary vibration reduction air spring unit arranged on the secondary vibration isolation air floatation support frame and a secondary vibration isolation air floatation platform top plate arranged on the secondary vibration reduction air spring unit; the secondary vibration isolation air floatation support frame is arranged on the primary vibration reduction rigid platform; the test pillar is arranged on the secondary vibration isolation air floatation platform top plate; and the high-low temperature chamber shell is arranged on the primary vibration reduction rigid platform for sealing the secondary vibration isolation air floatation support frame, the secondary vibration reduction device and the test pillar.

The invention provides a parallel and outer ring staggered type extrusion oil film damper. The parallel and outer ring staggered type extrusion oil film damper comprises a sleeve 3, a bearing 4, a support 5, a pull rod 6, a support 7, a case 8, an outer layer oil film oil supply hole 9, an inner layer oil film oil supply hole 10, an outer layer oil film damper A and an inner layer oil film damper,wherein the outer layer oil film damper comprises the case 8 and the support 5, and the inner layer oil film damper B comprises the sleeve 3 and the support 5; the outer layer oil film damper A comprises an oil film which fills between an outer-layer oil film damper shaft neck 2A and an outer layer oil film damper outer ring 1A, the inner layer oil film damper B is composed of an oil film which fills between the inner layer oil film damper shaft neck 2B and the inner layer oil film damper outer ring 1B. Compared with a traditional extrusion oil film damper, the rigidity of the oil film generated when the same oil film is damped is greatly reduced, the situation that the rigidity of the oil film is highly nonlinear is effectively inhibited, and the vibration reduction efficiency of the oilfilm damper is improved.

The invention relates to an adjustable swing-type tuned mass damper, which belongs to the technical field of controlling engineering structure vibration. Mass blocks of the damper are connected and fixed in a base and distributed in a local range or a full range of the base. In the length direction of the base, one end of the base is connected with a floor through a hinge support, and the other end of the base is connected with the floor through the damper. Frame connecting pieces and floor connecting pieces are arranged near the middle part of a frame on two sides of the base and in positions corresponding to the floor respectively, and are provided with slipways respectively. Springs are arranged in upper slipways and lower slipways and can be adjustable or fixed in position along the length direction of the base so as to connect the base with the floor. The damper can be arranged on the floor of a common building to obviously reduce floor vibration caused by the walking or other activities of people and other factors, and can play a role in reducing vibration within a wide change range of the actual stress conditions of the floor by setting or regulating the mass of the mass blocks and the positions of the springs.

The invention discloses a semi-active control method and a system for vortex vibration of a stiffening beam of a floating suspension bridge, wherein, the control method comprises the following steps:a controllable energy dissipation and vibration reduction unit is arranged between a bracket and a floating stiffening beam; collecting vibration response signals of stiffening girder and wind speed signals of bridge deck; judging whether the stiffening girder has vortex vibration response; if the vortex vibration response occurs, the corresponding structural modes are identified, and the amplitude of the vortex vibration response is judged to be greater than a set threshold value. if it is larger than, the variable control parameters of the controllable energy dissipation damping unit are calculated and adjusted to the optimal value by the semi-active control algorithm. The invention does not affect the normal operation of the bridge, simple ub structure, is easy to implement, can effectively control multi-mode vortex vibration of long-span floating suspension bridges, greatly reduce the difficulty of vibration control measures, improve the economy, reliability and robustness of vibration control measures, and ensure high vibration reduction efficiency even when structural parameters and inflow conditions are uncertain.