172results about How to "High damping characteristics" patented technology

The invention involving a magnetorheological fluid damping device for automobile suspension system.The magnetic field generator of this damping device consists of permanent magnet and electromagnetic coil.On the top of the damping device,there are guide apparatus and damping regulator,the function of which is that to ensure the damping channel is uniform annular duct and to meet the high-damp requirement in the restoration process and low-damp requirement in the compression process of damper seperately.The current in the electromagnetic coil designs of bi-directional and this controls the magnetic field intersity of the damping channel,decreases the excitation current of the electromagnetic coil,reduces energy consumption and decreases damper fever.On the non-controlling conditions,this damping device has the equivalent characteristics of the traditional shock absorber and can instead the passive shock absorber,after equiping corresponding current controller,this device can regulate the damping characteristics of suspension system,which improves the automobile driving safety and ride comfort.

A high and low temperature resistant damping silicon rubber consists of organic polysiloxane 55-70%, hydrophobic carbon white 25-38%, polysiloxane or silane 0-7.6%, peroxide cross-linking initiating agent 0.4-3.0% or / and ferric oxide<=4%. The chain general formula of organic polysiloxane is R1xR2ySiO(4-x-y) / 2, among them x+y is positive integral of 1-3, R1 is monoacidic alkyl, R2 is monoacidic unsaturated group such as phenyl, vinyl and allyl etc., content of phenyl is 5-15mol%, content of vinyl is 0.05-0.23mol% and molecular weight of polymer is 45-60 ten thousand. The process is carried out by mediating, mixing and vulcanizing. It has better damping characteristic, less compression deformation and higher mechanical strength. It can be used for aircraft damping absorber.

The invention relates to high-damping and high-strength Mg-Cu-Mn-Zn-Y alloy and a manufacturing method thereof. The high-damping and high-strength Mg-Cu-Mn-Zn-Y alloy is characterized by comprising the following alloying element components distributed in the alloy and the content value thereof in percent by weight: 1.0%-4.0% of Cu, 0.3%-1.5% of Mn, 0.3%-4.0% of Y, 1.0%-5.5% of Zn and the balance of magnesium. In order to solve the conflict of the damping property and the mechanical property of the magnesium alloy, the invention puts forward the fact that a Zn element and a Y element are added in the high-damping Mg-Cu-Mn alloy so that the Mg, the Zn and the Y form quasicrystals and / or long-prepared phases in the alloy, the quasicrystals or the long-prepared phases can introduce a great amount of new movable dislocations in a magnesium matrix, the damping property of the magnesium alloy is improved through movable dislocations newly increased in the magnesium matrix, and then the conventional heat extrusion is carried out on the alloy so that the mechanical property of the alloy is improved. The invention has the advantages of simple process, strong transportability, easy operation and lower cost and solves the problem that the Mg alloy has limited application due to high damping property and low mechanical property, and the used equipment is conventional and general equipment.

The invention provides wide temperature range high damping shock absorption rubber. In the formula of the shock absorption rubber, a great amount of emulsified butyl rubber is used and is matched with the interaction between organic low molecules and high polymers so as to produce high damping characteristics in a wide range and simultaneously have higher electric insulativity. The wide temperature range high damping shock absorption rubber can used for preparing high speed railway damping rubber bearing pads, motor shock absorption rubber cushions, apparatuses with higher requirements on the operating environment, and the like, and providing the necessary functions of buffering, vibration damping, and insulation.

A torsional vibration damper or other vibration damping device with a rubber vibration absorbing element. The rubber element is a peroxide-cured composition based on 100 parts of ethylene-alpha-olefin elastomer, and 5 to 100 parts of polyvinyl butyral polymer which may have a molecular weight from about 40,000 to about 250,000. The composition may also include a compatibilizer or homogenizer, such as chlorinated polyethylene. The polyvinyl butyral increases the damping of the composition, and the compatibilizer improves the temperature stability of the damping.

The invention discloses an integrated frequency and damping control method for a double-fed wind power generation unit. When the double-fed wind power generation unit normally operates, a maximum power tracking control policy is adopted; when system frequency is changed, a quick active control instruction is provided for participation in system frequency modulation of the wind power generation unit through a frequency controller, and the inertial frequency response of the wind power generation unit is simulated. The proportional differential control in the conventional frequency control of the wind power generation unit is improved into the proportional differential control with first-order inertia, so that the frequency control of the wind power generation unit is always shown as positive damping characteristics, the wind power generation unit have a frequency modulation control function and a system power oscillation suppression control function, and a foundation is laid for the wide application of the controller. After the frequency of a power grid is changed, the electromagnetic power of the wind power generation unit is quickly regulated by frequency control to participate in frequency modulation of the power grid; if a system is subjected to inter-area low-frequency oscillation, the wind power generation unit can suppress the power oscillation of the system under the control policy.

A torsional vibration damper or other vibration damping device with a rubber vibration absorbing element. The rubber element is a peroxide-cured composition comprising 100 parts of ethylene-alpha-olefin elastomer, and 20 to 100 parts of substantially isobutylene or butene polymer having a viscosity average molecular weight greater than about 5000. The polymer may also be a copolymer of isobutylene and isoprene. The addition of the isobutylene polymer to the ethylene-alpha-olefin elastomer composition increases the vibration damping character of the rubber.

A torsional vibration damper or other vibration damping device with a rubber vibration absorbing element. The rubber element is a peroxide-cured composition comprising 100 parts of ethylene-alpha-olefin elastomer, and 20 to 100 parts of substantially isobutylene or butene polymer having a viscosity average molecular weight greater than about 5000. The polymer may also be a copolymer of isobutylene and isoprene. The addition of the isobutylene polymer to the ethylene-alpha-olefin elastomer composition increases the vibration damping character of the rubber.

The invention relates to porous material preparation, in particular relates to a method for preparing a high fatigue property porous Ti-6Al-4V bulk material, which is used for solving the problem of low fatigue property of the porous Ti-6Al-4V bulk material of the prior art. The method is that an 'electron beam molten metal molding technology' is utilized to prepare the large Ti-6Al-4V bulk material with the porosity of 50%-95% at first, the porous material is then subjected to two steps of thermal treatment of annealing and aging at 400 DEG C and 1000 DEG C, and the Ti-6Al-4V porous material with high fatigue strength, low elasticity modulus of (0.1-20 GPa) and 'the ratio of fatigue strength / compressive strength' of 0.7 is obtained finally. According to the method, the mechanical performance of the porous Ti-6Al-4V pore wall material is controlled through a thermal treatment technology, and thus, a large titanium alloy porous material with excellent fatigue property is obtained and can be widely applied to the fields of aerospace, medical treatment and the like.

A torsional vibration damper or other vibration damping device with a rubber vibration absorbing element. The rubber element is a peroxide-cured composition based on 100 parts of ethylene-alpha-olefin elastomer, and 5 to 100 parts of polyvinyl butyral polymer which may have a molecular weight from about 40,000 to about 250,000. The composition may also include a compatibilizer or homogenizer, such as chlorinated polyethylene. The polyvinyl butyral increases the damping of the composition, and the compatibilizer improves the temperature stability of the damping.

A power generation park is provided including a power output for providing electrical output power to an electricity network. A power generation device includes a converter device configured for receiving input power from a power generator and providing, in response hereto, the electrical output power to the power output. The power generation park further includes a controller configured for receiving an oscillation indicating signal indicative of a power oscillation in the electricity network, the controller further configured for providing a damping control signal in response to the oscillation indicating signal, the converter device configured for modulating the electrical output power in response to the damping control signal so as to damp the power oscillation in the electricity network.

The invention discloses a high-damping and high-performance alloy cylinder sleeve and a preparation technology thereof. The high-damping and high-performance alloy cylinder sleeve comprises a cylinder sleeve body and a zinc-aluminum high-damping alloy coating sprayed to the outer wall of a cylinder sleeve body. The thickness of the zinc-aluminum alloy coating is 0.3-1 mm. The cylinder sleeve body comprises, by weight, 3.2-3.5% of C, 2.8-3.3% of Si, 0-0.02% of P, 0-0.01% of S, 3.0-4.0% of Cu, 1.5-2.0% of Mn, 0.4-0.6% of Ni, 0.04-0.08% of Mg, 0.02-0.05% of Ce, and the balance Fe. The nodular cast iron cylinder sleeve obtained through the formula and preparation technology has high damping characteristics, vibration and noise of the engine cylinder sleeve can be effectively reduced, and a wearing surface on the inner wall of the cylinder sleeve has good wear resistance and anti-attrition performance, and the outer wall of the cylinder sleeves has the advantages of being high in strength, good in plasticity, good in corrosion resistance and anti-cavitation ability, short in run-in period with pistons and the like.

The invention discloses a double-fed wind turbine generator subsynchronous oscillation suppression method of a broadband rotor additional damping, which is implemented in control of a rotor-side converter of a doubly-fed fan and used for suppressing subsynchronous oscillation of a doubly-fed wind turbine generator; the three-phase currents of a double-fed fan rotator is detected; after the rotor current is detected, Park transform is performed on the three-phase currents to form a DQ axis system; filtering is performed by using a filter, sub-synchronous frequency band components of the rotor currents are extracted in real time, and then phase compensation and proportional amplification control is performed, the virtual additional rotor damping is added to an original converter DQ-axis rotor voltage control command. A control strategy of a fan rotor-side converter is changed to perform subsynchronous oscillation suppression, broadband additional damping control is increased on the rotor-side so as to enhance the damping characteristics of a subsynchronous frequency band of the wind turbine generator, the electrical damping of the whole wind turbine generator is enhanced, the subsynchronous oscillation of the system is suppressed; and the method can avoid additional devices, and is conductive to engineering implementation.

The invention discloses a labyrinth damping sealing device with low leakage and high damping performance. The sealing device comprises a rotating shaft, sealing long teeth, sealing short teeth and a damping part, wherein the rotating shaft is provided with a plurality of bosses and grooves, which are axially and alternately arranged; and the sealing long teeth, the sealing short teeth and the damping part are fixed on a sealing stator ring. The damping part has the following three structures: a honeycomb structure, a hole structure and a bag structure. The labyrinth damping sealing device has the characteristics of low leakage and high damping; the possibility of causing damage to a rotor and a sealing part due to impact and rubbing between the damping sealing part (which is of a honeycomb structure or a hole structure) and the rotor is also eliminated; and not only can the energy conversion efficiency and the operation stability of a turbomachinery be further improved, but also the service life of the sealing part can be prolonged.

The invention discloses a hoop for an airplane hydraulic pipeline and a design method thereof. The method comprises the steps of 1 establishing a vibration equation model of the hoop and the hydraulic pipeline and obtaining vibration isolation transmissibility; 2 according to the flight profile of an airplane, obtaining a target function and determining and optimizing damping ratio xi of parameters; and 3 determining materials used by the hoop for the airplane hydraulic pipeline according to optimized damping ratio, and designing a hoop structure. The hoop comprises fastening bolts, spring gaskets, an upper metal rubber pad block, an upper anti-lock brake system (ABS) plastic hoop block, a lower ABS plastic hoop block and a lower metal rubber pad block. The lower ABS plastic hoop block isinternally embedded in the lower metal rubber pad block, the upper ABS plastic hoop block is internally embedded in the upper metal rubber pad block, and the airplane hydraulic pipeline is located between the lower metal rubber pad block and the upper metal rubber pad block. Two fastening bolts penetrate through the upper ABS plastic hoop block and the lower ABS plastic hoop block, and the springgaskets are arranged between the two fastening bolts and the upper ABS plastic hoop block. The vibration isolation rate weighted sum corresponding to excitation source frequency points determined by the flight profile of the airplane serves as a basis of parameters for designing the hoop, and the hoop is designed according to the basis of the parameters.

The invention belongs to the technical field of intelligent materials capable of vibration attenuation and sound absorption, particularly relates to a high-damping magneto-rheological elastomer and a preparation method thereof, and aims to improve the damping characteristics and mechanical characteristics of the original polyurethane-based magneto-rheological elastomer and ensure a higher magneto-rheological effect through preparing epoxy resin / polyurethane interpenetrating network substrate on the basis of the polyurethane-based magneto-rheological elastomer. The high-damping magneto-rheological elastomer comprises the following raw materials in weight percentage: 5-10% of epoxy resin, 10-20% of polyurethane prepolymer, 60-70% of carbonyl iron powder, 4.5-10% of a plasticizer and 0.5-1% of a curing agent. The high-damping magneto-rheological elastomer has high damping and high mechanical strength as well as the application requirements of a higher magneto-rheological effect, and can be applicable to the fields of vibration attenuation, sound absorption and intelligent damping.

The invention discloses a method for improving a phase-locked loop with the enhancement of damping characteristic of an inverter control system and an inspection method thereof. Two cascaded single-phase phase-locked loops are included, and the method comprises the steps that: pre-stage and post-stage single-phase phase-locked loops collect three-phase voltage signals ega, egb, and egc of a powergrid, and the three-phase voltage signals are converted into two-phase voltage signals egd and egq, e'gd, and e'gq by using Clark transformation and Park transformation; the pre-stage single-phase phase-locked loop is subjected to coordinate transformation to obtain a difference value between egq and a reference value 0 to be a reference value input of e'gq of the post-stage single-phase phase-locked loop; and the accurate phase locking of the grid voltage is achieved by a loop filter and a voltage controlled oscillator through reference value correction, and a phase angle of a voltage signalobtained by the post stage is taken as an output phase angle of the improved phase locked loop. According to the method, the resonance of the inverter system can be suppressed.

The invention discloses a locking and releasing structure driven by a shape memory alloy strip, and relates to the field of locking and releasing mechanisms. The locking and releasing structure drivenby the shape memory alloy strip further comprises a supporting frame and a locking mechanism, wherein the supporting frame comprises a sleeve and at least one supporting arm connected with the sleeve; the ejection piece is movably arranged in the sleeve; the locking assembly is suitable for limiting the movement of the ejection piece in the axial direction in a locking state and releasing the movement limitation on the ejection piece in an unlocking state; and the shape memory alloy strip is suitable for enabling the locking assembly to enter an unlocking state when powered on and enabling the locking assembly to enter a locking state when not powered on. The plane hook locking and releasing structure driven by the shape memory alloy strip has the advantages of being low in impact, shortin unlocking time, easy to reset, high in motion precision, low in friction, free of pollution and capable of being repeatedly used.

In one aspect the present invention provides a storage medium for data, the storage medium comprising: a) a substrate, a physical portion of which comprises at least one polyimide, and b) at least one data layer on the substrate. The substrate comprising a polyimide exhibits low axial displacement and beneficial damping characteristics.

The invention provides a thrust air foil bearing, and relates to the technical field of air bearings. The technical problems that a thrust foil bearing is completely scrapped after a top foil is wornin the prior art, and the bearing capacity and stability of the bearing are not ideal are solved. The thrust air foil bearing comprises a top foil module, a wave foil module, a pre-tightening module and a bearing seat, wherein the pre-tightening module, the wave foil module and the top foil module can be sequentially stacked from bottom to top and detachably and fixedly mounted on the bearing seatthrough pins, and the pins can limit the circumferential rotation of the top foil module, the wave foil module and the pre-tightening module; and the top foil module, the wave foil module, the pre-tightening module and the bearing seat can be sequentially sleeved on a rotor, a wedge-shaped space can be formed between the top foil module and a thrust disc of the rotor, and the pre-tightening module can abut against the bearing seat and provide a pre-tightening force for the thrust air foil bearing. According to the thrust air foil bearing, the production and manufacturing cost is reduced, thebearing capacity of the bearing is improved, and the stability of the bearing-rotor system is increased.

There is provided a power generation park (100) having a power output (108) for providing electrical output power (150) to an electricity network (128). A power generation device (102a, . . . 102n) has a converter device (106) configured for receiving input power (142) from a power generator (104) and providing, in response thereto, the electrical output power (150) to the power output (112). The power generation park (100) also has a controller (122) being configured for receiving an oscillation indicating signal (126) indicative of a power oscillation in the electricity network (108), the controller (122) being further configured for providing a damping control signal (132) in response to the oscillation indicating signal (126); the converter device (106) being configured for modulating the electrical output power (150) in response to the damping control signal (132) so as to damp the power oscillation in the electricity network (128).

The invention discloses a low-frequency vibration damping metamaterial which comprises a substrate plate. A hole array is formed in the substrate plate, an external ring-shaped permanent magnet is installed in each hole and fixedly connected with the substrate body, a metal ring is installed on the inner side of each external ring-shaped permanent magnet, and the metal ring is fixedly connected with each external ring-shaped permanent magnet. A cylindrical permanent magnet is further installed at the circle center position of each external ring-shaped permanent magnet and is connected with thecorresponding metal ring through a ring-shaped elastic membrane. The external ring-shaped permanent magnets, the metal rings, the ring-shaped elastic membranes, the cylindrical permanent magnets andthe like constitute a locally resonant cell of the vibration damping metamaterial. The low-frequency vibration damping metamaterial has ultra-low frequency band gaps and high damping low-frequency vibration absorption performance, and has the outstanding advantages of being low in band gap frequency, wide in vibration damping band gap, high in low frequency damping capacity, capable of realizing low-frequency vibration damping and the like. Compared with a traditional vibration damping metamaterial, the vibration damping and noise reduction performance is greatly improved, and the low-frequency vibration damping metamaterial can be used for lowering, isolating and eliminating low-frequency vibration and noise in equipment such as automobiles and ships.

The invention relates to a large-scale infrared focal plane structure with thermal stress unloading capacity, which comprises a detector chip (1) and the like. The detector chip (1) is mounted on sapphire (2); one lateral surface of a first transitional substrate (31) is a plane, a ring-shaped groove is formed at the middle part of the other lateral surface of the first transitional substrate (31), and the sapphire (2) is adhered to the side of the plane of the first transitional substrate (31); one lateral surface of a second transitional substrate (32) is a plane, a ring-shaped convex structure is formed at the middle part of the other lateral surface of the second transitional substrate (32), the convex structure is abutted with the ring-shaped groove of the first transitional substrate (31) to form a cavity, and a sapphire compensation sheet (7) is mounted in the cavity and is adhered to the first transitional substrate (31); and the second transitional substrate (32) is mounted on a cold plate (4). According to the invention, by the stress unloading structure, a thermal stress and thermal deformation which are generated due to mismatching of thermal expansion coefficients of laminated materials are adsorbed, so that the thermal stress and thermal deformation of a large-scale infrared focal plane are effectively reduced, and reliability of a large-scale infrared focal plane device is improved.

The invention discloses a shear type rubber damper with a cable fastening device. The shear type rubber damper comprises a cable fastening device, multiple rubber monomer dampers and a connection device, wherein the cable fastening device comprises a cable clamp, a connection bolt, an upper connection plate at the upper end of the cable clamp and a lower connection plate at the bottom of the cable clamp; each rubber monomer damper comprises a high-damping rubber monomer, steel plates at the two ends of the high-damping rubber monomer and connection bolts fixedly connected with the steel plates; the high-damping rubber monomer is connected with the steel plates at the two ends of the high-damping rubber monomer in a vulcanization manner; the connection device comprises upper and lower connection discs; when in use, one end of each rubber monomer damper is connected with a backstay cable embedding pipe fixed on a bridge deck by use of a flange welded on an embedded orifice through the connection device, and the other end is connected with the lower connection plate of the cable fastening device; and the cable clamp of the cable fastening device is fixed on the backstay cable body in a hoop manner. The damper makes full use of the high-damping rubber shear energy consumption performance, has a simple structure and is convenient to mount.

The invention discloses a combined mini-type foil gas dynamic pressure bearing. The combined mini-type foil gas dynamic pressure bearing comprises a bearing body (1), end face glands (4) arranged at the two sides of the bearing body (1), multiple elastic foil supporting structures (2) and top foil (3), wherein the multiple elastic foil supporting structures (2) are fixedly arranged on the inner wall of the bearing body (1); the top foil (3) is attached to the inner sides of the multiple elastic foil supporting structures (2) and fixed to the inner wall of the bearing body (1) through a foil outwards-extending part (31). The combined mode is adopted, so that the bearing capacity of the mini-type gas bearing is improved, and installation is more convenient. Meanwhile, the reasonable elastic supporting structures are adopted, the starting stiffness is small, the stiffness is greatly increased as the rotation speed is increased, and the stability and shock resistance are improved.

The invention relates to a vibration isolator, in particular to a composite structure vibration isolator with rubber and a wire mesh combined for electronic equipment. Springs (8) are located on a base plate (9) of a shell (1). The springs (8) are filled with wire mesh pads (7). A transition core (2) is placed on the springs (8). The parts below the transition core (2) and outside the springs (8) are filled with wire mesh pads (7). The transition core (2) is internally provided with a cavity. A rubber block (4) is installed in the cavity. An installation core (5) is fixed to the rubber block (4). The parts between the shell (1) and the transition core (2) are filled with wire mesh pads (7). By the adoption of the composite structure vibration isolator, vibration attenuation efficiency is improved, and the structure is simple.

An embedding damped paste and its process for preparing relates to a damped paste and its process for preparing. In order to solve the problems that the present imbedding material is of high cost and high specific density and insufficient damping performance, the embedding damped paste of this invention is epoxide resin -polyurethane size mixture containing 50-70vol.% cenosphere. The principle process for preparing consists of adding the surface modified cenosphere according to a set proportion into epoxide resin base, with an adequate processing parameter, obtaining the said embedding micropore paste by ultrasonic dispersion and vacuum outgassing, which can be poured into the metal pipe, closed or semiclosed swash cavity to obtain the damping mechanism. The embedding paste has advantages that it is of low density (0.8-0.9g cm-3), low cost, high amortization and high strength.

The invention discloses a building trough vibration isolator. The vibration isolator comprises a vibration isolator body. The vibration isolator body is arranged in a trough which is reserved between one side of a building and the side wall of a foundation pit. The vibration isolator body comprises a waterproof layer, an elastic damping layer, a concrete layer and a rubber base plate. The waterproof layer, the elastic damping layer and the concrete layer are arranged in the trough and cling to the trough. The rubber base plate is arranged between the concrete layer and soil on the bottom of the foundation pit. By means of the trough space design of the vibration isolator, the structure design is reasonable, the engineering implementation is easy and the vibration which transmits from the side wall of the foundation pit to the building foundation can be effectively isolated under the premise of guaranteeing the safety of the building.

The invention discloses a vibration isolation device for a floating plate. The vibration isolation device comprises a sleeve (6), a locking backing plate (5), an upper bearing plate (3) and a base (15), wherein the inner wall of the sleeve (6) is provided with a spacing block shoulder (10); the locking backing plate (5) is fixed on the spacing block shoulder (10) through a connecting plate (5a); the locking backing plate (5) is matched with the lower surface of the spacing block shoulder (10); an adjustment backing plate (4) is arranged between the locking backing plate (5) and the upper bearing plate (3); the upper bearing plate (3) is connected with the base (15) through a gland cover (2); and an elastic element (14) is arranged in the gland cover (2). The vibration isolation device disclosed by the invention is concise in structure and convenient in installation, maintenance and disassembly, can be used for solving the problem that the rubber floating plate vibration isolator in the prior art is easy to age and has short service life. In addition, the vibration isolation device disclosed by the invention has good vibration isolation effect.

The invention discloses a novel active air foil bearing based on PZT and SMA. The novel active air foil bearing comprises a shaft sleeve, piezoelectric ceramics (PZT), a memory alloy wire mesh block (SMA block), flexible hinges, a rigid push rod, pre-pressure applying devices, a cooling pipe, a wave foil and a top foil; the PZT and the SMA block are installed in pre-machined through grooves, the corresponding pre-pressure applying devices are designed for the PZT and SMA block, the wave foil is formed by pressing an elastic material, one end of the wave foil is welded, and the other end of thewave foil is free. The top foil overlies the wave foil. Power supply signals of the PZT are controlled, the flexible hinges are coupled, PZT deformation is amplified, the wave foil is supported by the rigid push rod, the wedge-shaped space is enlarged, therefore, the crossed coupling effect is weakened, the dynamic pressure effect of the bearing is enhanced, and the rigidity characteristic of thebearing is improved; by controlling the temperature of the SMA block, the SMA block expands and contracts to generate larger structural damping, and the damping characteristic of the bearing is improved; and finally, the rigidity and damping characteristics of the bearing are actively controlled, and the stability of the system is improved.