170results 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 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.

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 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 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 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.

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.

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 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.

The invention provides an environment-friendly friction material and a brake pad and a preparation method based on the environment-friendly friction material. The environment-friendly friction material is composed of the following raw material components of, in percentage by mass, 3%-8% of modified phenolic resin, 9%-32% of steel fiber, 5%-20% of mineral fiber, 1%-5% of aramid fiber, 10%-30% of graphite powder, 1%-5% of flake zinc powder, 5%-20% of barium sulfate, 5%-15% of titanate, 0.5%-3% of aluminum oxide, 5%-15% of zirconium oxide, 2%-20% of granular magnesium oxide, 1%-5% of calcium hydroxide and 3%-15% of rubber-based granular material. The brake pad prepared by the environment-friendly friction material and the preparation method is free of asbestos, free of heavy metal components such as copper, long in service life, stable in braking performance and free of damage to the dual disc and less ash drop; the environment-friendly friction material and the brake pad and the preparation method based on the environment-friendly friction material effectively solves the defects that the service life is reduced, the brake efficiency is reduced, the dual disc is damaged and the like due to the fact that copper is not contained in the prior art.