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 variable-rigidity and variable-damping tuned mass damper, which is mainly applied to vibration control over multi-frequency structures such as high-rise buildings or long-span bridges, ocean platforms and the like. The tuned mass damper comprises a mass block, wherein a vertical spring is connected to the upside of the mass block in a vertical direction, and magnetorheological dampers are respectively arranged on the mass block in a horizontal direction and a vertical direction; and a cantilever spring is arranged horizontally and longitudinally, one end of the cantilever spring is connected with the mass block, the other end of the cantilever is connected with a traveling mechanism. Two ends of the traveling mechanism are placed on a rigid guide rail, and the traveling is driven by a stepping motor to move longitudinally. The length of the cantilever spring is regulated by the movement of the stepping motor, so that the tuning frequency of the tuned mass damper is further regulated; and by regulating currents of the magnetorheological dampers to change the damping ratio of the tuned mass damper, the rigidity and the damping are regulatable continuously, so that the vibration control in the vertical direction and the horizontal direction. The variable-rigidity and variable-damping tuned mass damper disclosed by the invention has a clear working principle and has the advantages of easiness for realizing semi-active control property, good damping effect, fast response, high precision and the like in engineering application.

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 semi-active vibration control eddy current damper which is used for inhibiting structure vibration. The semi-active vibration control eddy current damper comprises an eddy current energy consumption module, an automatic control module, a magnetic shielding case, a buffer spring and connecting parts. The eddy current energy consumption module comprises an array electro-permanent magnet and a copper plate. The automatic control module comprises an external power supply, a vibration switch and a resistive transducer. The magnetic shielding case is a rectangular closed housing made of soft iron with relatively large magnetic conductivity. When a structure vibrates, the vibration switch is switched on, an automatic control circuit is closed, and meanwhile the copper plate begins to perform magnetic induction line cutting motion to generate eddy current energy consumption; the magnitude of current in the circuit is changed along with the intensity of vibration, so that the magnetic field intensity is changed further, the effect of actively adjusting a damping factor is realized, the damper can keep a relatively high efficiency under different intensity of vibration, and the semi-active vibration control is realized. The semi-active vibration control eddy current damper has the characteristics of being simple in device, variable in damping, and very small in mechanical friction, thereby having a wide application prospect in the field of structure vibration control.

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.

The invention provides a damping hollow rod with a multistage energy dissipation mechanism, and belongs to the technical field of structure vibration control. The damping hollow rod comprises a hollowrod body, permanent magnets, conductor pieces, rotating springs, pull-press springs, a sliding block, balls, colliding rings, a guide rod, round rubber gaskets, inner end plates, fixed rods, rubber layers and stiffening ribs. According to the damping hollow rod, the eddy-current damping technology is combined with other passive vibration attenuation technologies, and the multistage energy dissipation mechanism is achieved. When small-amplitude vibration happens to the structure, eddy current energy dissipation units and rotating spring energy dissipation units achieve energy dissipation together; when large-amplitude vibration happens to the structure, the eddy current energy dissipation units and colliding energy dissipation units achieve energy dissipation together; and the different energy dissipation units achieve cooperative energy dissipation work, the energy dissipation control effect is obviously enhanced, meanwhile, damping parameters can be conveniently adjusted, and magnetleaking of magnetic circuits is basically avoided.

The invention discloses a device for absorbing vibration through nonlinear energy transfer and collision energy consumption, which comprises an absorber body, wherein the absorber body comprises a connection support fixedly connected with a structure member to be subjected to vibration absorption, a box body is fixedly arranged on the connection support, a mass block is arranged in the box body, two ends of the mass block are respectively provided with a nonlinear spring I and a nonlinear spring II, one end of the nonlinear spring I and the nonlinear spring II are fixedly connected with the mass block, the other end of the nonlinear spring I and the nonlinear spring II are fixedly connected the inner wall of the box body; a collision adjusting device I is arranged at the upper part of thebox body, a collision adjusting device II is arranged at the lower part of the box body, the low end of the collision adjusting device I and the upper end of the collision adjusting device II penetrate through the box body, the collision adjusting device I and the collision adjusting device II have gaps with the mass block, and a gap is also arranged between the collision adjusting device II and the structure member to be subjected to vibration absorption. The invention has the advantages of rational structure design, convenience for use and good vibration absorbing effect, low use cost and wide application range.

The invention discloses a single-barrel direct-drive full-automatic pulsator washing machine. The single-barrel direct-drive full-automatic pulsator washing machine comprises a base and a control system, wherein an outer shell is arranged on the base; a bearing seat used for sealing is arranged in the center of the bottom of the outer shell; a dewatering barrel is arranged in the outer shell; a gap is reserved between the dewatering barrel and the inner wall of the outer shell; the dewatering barrel is driven by a direct-drive motor; the direct-drive motor is arranged on the base and is positioned below the dewatering barrel; the control system is used for controlling the direct-drive motor to rotate forwards or backwards; the shaft end of an output shaft of the direct-drive motor is connected with a transmission shaft; a washing transmission mechanism, a dewatering transmission mechanism and a washing and dewatering conversion mechanism are arranged between the dewatering barrel and the direct-drive motor; a split-type speed reducing clutch device is also arranged between the dewatering barrel and the direct-drive motor; the split-type speed reducing clutch device comprises a speed reducer and a clutch mechanism; the speed reducer is centered, is arranged below the dewatering barrel and above the bearing seat used for sealing, and is sealed by a sealing ring. The single-barrel direct-drive full-automatic pulsator washing machine is high in transmission efficiency, small in vibration amount, simple in structure and is easy to install and maintain.

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.

The invention discloses a polyphenyl ether-polyorganosiloxane photo-crosslinking thin film based on a graft copolymer and a preparation method of the polyphenyl ether-polyorganosiloxane photo-crosslinking thin film. The preparation method comprises the following steps: (1) preparing allylated polyphenyl ether; (2) synthesizing silicon-hydrogen bond terminated polysiloxane by taking n-butyllithiumas an initiator and taking chlorodimethylsilane as an end capping agent; (3) carrying out copolymerization on the allylated polyphenyl ether and the silicon-hydrogen bond terminated polysiloxane to prepare a polyphenyl ether-polyorganosiloxane graft copolymer; and (4) blending the polyphenyl ether-polyorganosiloxane graft copolymer with polyphenyl ether and polyorganosiloxane, and carrying out photo-crosslinking to obtain a photo-crosslinking thin film. Compared with the prior art, the polyphenyl ether-polyorganosiloxane photo-crosslinking thin film based on the graft copolymer not only has awide effective damping temperature range, but also has good heat resistance and high loss factors, the damping property is shown in a temperature range from 152 DEG C to 223 DEG C, the effective damping temperature range is greater than 60 DEG C, and the loss factor (tan delta) is greater than or equal to 0.9. In addition, the photo-crosslinking preparation method is adopted, and has the advantages of rapidness, high efficiency and energy conservation.

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.

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 an integrated type magneto-rheological damper with built-in distance sensors for displacement detection. The integrated type magneto-rheological damper mainly comprises a piston rod, a dust cover, a capacitive distance sensor I, a capacitive distance sensor II, a damper cylinder barrel, a piston head, an excitation coil, end covers and the like; the capacitive distance sensor I and the capacitive distance sensor II are arranged in the dust cover and are rigidly connected to a left damper end cover of the damper; in the process of external vibration, the dust cover and the damper cylinder barrel move relative to each other, the radial clearances between the inner inclined surface of the dust cover and the two capacitive distance sensors also change, and therefore anoutput signal which corresponds to the displacement of the piston head in proportion is induced; and the current of the excitation coil is adjusted according to the obtained displacement information of the piston head, and therefore the purposes of optimizing the damping effect, improving the damping efficiency and saving energy can be achieved. The integrated type magneto-rheological damper has the advantages of being compact in structure, small in size, high in sensitivity, resistant to pollution, high in anti-interference capability and particularly suitable for a semi-active control systemin a severe working environment.

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.

A shock absorber comprises a sleeve, a cylindrical piston with a seal attached to the cylindrical surface of piston with two side surfaces, a rod coupled with the piston, a piston cap enclosing the sleeve on the piston's side, and a rod cap enclosing the sleeve on the rod's side. The piston and rod move within the sleeve overcoming resistance of oil / gas cross-flows from one sleeve's chamber to the other, friction between the seal and the sleeve's walls, and friction between the rod and a seal mounted in the rod cap. The proposed absorber allows increasing the resistance offered to the movement of piston thereby improving the efficiency of damping, and suppressing / avoiding auto-oscillation and resonance regimes. This is achieved by providing a number of narrowing / widening necks arranged on the sleeve's walls within regions adjoined to the caps. Different embodiments combine features conditioned by various diameter differences for the necks, etc.