176results about How to "Improve damping performance" patented technology

The invention provides a vibration analysis method of a reactor vibration isolation system, a program product and electronic equipment. The method comprises the following steps: acquiring a vibration signal of a vibration isolation bracket in a working state; extracting vibration characteristics from the vibration signals by using time domain analysis and frequency domain analysis; according to the vibration characteristics, determining association between the structural characteristics of the vibration isolation bracket and the vibration characteristics to obtain first association; according to the finite element analysis and the first relevance, a finite element model of the vibration isolation support is established; according to modal analysis and a finite element model, the inherent frequency of the vibration isolation support is determined, the correlation between the inherent frequency and the external excitation frequency is determined, and second correlation is obtained; according to the first relevance, the second relevance and a finite element model, the influence of different structural features on the vibration propagation path of the vibration isolation support is simulated, and the damping effect is obtained; and according to the damping effect, the vibration isolation support is optimized. The problem that it is difficult to guarantee the damping effect and the good vibration isolation performance of a vibration isolation support at the same time in the prior art is solved.

The invention discloses a high-temperature superconducting electric maglev vehicle multi-mode damping device based on an electromagnetic shunting technology. The high-temperature superconducting electric maglev vehicle multi-mode damping device comprises a coil system and a vehicle suspension frame. Wherein the coil system comprises a vehicle-mounted superconducting magnet, an 8-shaped suspension guide coil and a propulsion coil; the vehicle suspension frame carries a vehicle-mounted superconducting magnet, a low-temperature container, a damping coil and an external circuit module. Accurate design of electromagnetic parameters is achieved through a plurality of branch parallel circuits, dynamic responses of different frequencies can be effectively matched, and multi-mode vibration reduction is achieved in a passive mode. An optimized damping effect can be provided for various vibration modes in a rail system without depending on an active control system, and the vibration reduction performance of the system is remarkably improved. Aiming at different vibration frequencies, adjustment can be carried out by replacing components such as capacitors and inductors in the branches, the structure is simple, and the cost is low.

The invention belongs to the technical field of polyurethane materials, and provides a high-damping anti-fatigue and anti-aging polyurethane elastomer and a preparation method thereof. The high-temperature-resistant polyurethane elastomer is prepared from the following raw materials in parts by weight: 20 to 30 parts of poly (diethylene glycol adipate) glycol (PDA), 30 to 50 parts of polytetrahydrofuran ether glycol (PTMEG), 5 to 15 parts of chain extender, 0.1 to 0.3 part of A33, 0.1 to 0.2 part of organic tin catalyst, 2 to 5 parts of hindered phenol antioxidant, 1 to 3 parts of hindered amine light stabilizer, 3 to 8 parts of nano particles and 30 to 50 parts of isocyanate prepolymer. The isocyanate prepolymer is prepared from 1, 4-phenyl diisocyanate (PPDI) and branched chain-containing polytetrahydrofuran glycol PTXG according to a mass ratio of 1: (1.8 to 2.2). The polyurethane elastomer is excellent in damping performance and fatigue aging resistance, and meets the use requirements under complex working conditions.

The invention belongs to the technical field of electronic parts, and provides a magnetic damping rotation structure and a magnetic damping generation method. The first annular magnetic shaft is fixed on the mounting base, a plurality of first grooves are uniformly formed in at least one end face of the first annular magnetic shaft, and a first magnetic boss is formed between every two adjacent first grooves; the second annular magnetic shaft and the first annular magnetic shaft are coaxially arranged, a plurality of second grooves are evenly formed in the surface of the end, facing the first magnetic boss, of the second annular magnetic shaft, and a second magnetic boss is formed between every two adjacent second grooves; gaps are arranged between the first magnetic bosses and the second magnetic bosses, and the first magnetic bosses and the second magnetic bosses are in one-to-one correspondence and generate attraction magnetic force. When the second annular magnetic shaft rotates at a low speed, the damping value of attraction between the first annular magnetic shaft and the second annular magnetic shaft is changed to generate feedback of light and heavy sections of hand feeling, so that the damping effect is effectively improved, and the damping device can be applied to the fields of mice, keyboards, automobile instrument panels and the like.

The invention provides a swing type tuned mass damper which comprises a mass unit, a swing arm unit and an energy consumption unit, the mass unit comprises an upper mass block and a lower mass block, the upper mass block is in swing connection with a controlled structure through the swing arm unit, and the lower mass block is in swing connection with the controlled structure through the energy consumption unit. The lower mass block can be horizontally and movably supported on the controlled structure through a horizontal guide assembly; the energy dissipation unit comprises a linear damping assembly and a nonlinear damping assembly, the linear damping assembly is arranged at the bottom of the lower mass block, the nonlinear damping assembly comprises linear dampers symmetrically arranged on the two sides of the mass unit, and the upper mass block and the lower mass block are connected through the linear dampers. The vibration damper has the advantages that the occupied space is reduced under the condition of the same mass unit vibration frequency and effective mass, and the vibration damping effect is good.

The invention relates to the technical field of inspection robots, in particular to a rail type inspection robot capable of automatically adjusting clamping force, which comprises a camera and an I-shaped rail, a mounting plate is arranged below the I-shaped rail, and two walking devices are rotationally arranged on the upper side of the mounting plate; and the walking device comprises a bottom plate rotationally connected to one end of the upper side of the mounting plate, two side plates are fixed to the two sides of the bottom plate, and supporting shafts are rotationally connected to the upper ends of the two side plates in a penetrating mode. Through the guide mechanisms on the two sides of the walking device, when the walking device moves, the multiple guide wheels of the guide mechanisms on the two sides roll along the side face of the I-shaped rail, the multiple guide wheels of the two guide mechanisms are attached to the surfaces of the two sides of the I-shaped rail correspondingly, and transverse supporting force is provided for the walking device during moving; when the walking device moves along the linear section of the I-shaped rail, the walking device can be prevented from generating transverse deviation, and the moving stability of the walking device is improved.

The invention discloses an aero-engine thrust bearing buffering and damping structure which comprises a thrust bearing, a bearing ring cavity structure and a bearing buffering structure, a bearing outer ring is installed in a ring cavity of a fixed supporting frame, a bearing inner ring is installed on a fan rotating shaft, and a buffering body is arranged between the bearing outer ring and the ring cavity. And the bearing outer ring is provided with an instantaneous breaking boss which is radially positioned with the ring cavity. When fan blades of an aero-engine fly to lose a limit load similar to that of the aero-engine, an impact load is transmitted to the force bearing structure from the fan rotor through the bearing, the load is fused after exceeding the bearing limit of the boss, the outer ring of the bearing is allowed to move relative to the ring cavity in the radial direction, and the buffering and damping effects of a fan rotor system are achieved by extruding the buffering body. Meanwhile, due to the design of the damping structure, the critical rotating speed of the fan rotor is reduced, and the load on the bearing when the rotor passes through the critical rotating speed is further reduced. In the windmill state, the structure can effectively reduce the vibration level of the rotor, and stable operation of the bearing under the non-power condition is ensured.

The invention discloses a porous static pressure gas radial bearing based on piezoelectric shunt damping, and belongs to the technical field of static pressure gas bearings. Comprising a bearing shell, a bearing sleeve and a porous throttler which are arranged in the bearing shell in the axial direction, and a piezoelectric shunt damping module which is arranged between the bearing shell and the bearing sleeve and is axially fixed through a check ring. Wherein the piezoelectric shunt damping module is formed by connecting a force amplifier, a piezoelectric ceramic stack, a pre-tightening pressing block, a pre-tightening screw, a steel ball and a locking nut; the force amplifier is of an axisymmetric structure composed of two trapezoidal connectors, four thin-wall beams and two end plates. The piezoelectric shunt damping module is arranged in the bearing, vibration mechanical energy of the bearing sleeve is converted into electric energy through the piezoelectric ceramic stack, and net damping is provided for the bearing by consuming the electric energy generated by the piezoelectric ceramic stack through the external shunt resonance circuit, so that the amplitude of the rotor relative to the bearing at a high rotating speed is reduced; the high-speed stability of the bearing is improved.

The invention relates to the technical field of external valves of automobile shock absorbers, and discloses a pilot valve which comprises a liquid passing cover, a special-shaped gasket is connected to the lower portion of the liquid passing cover, an oil passing groove is formed in the special-shaped gasket, the oil passing groove is of a cross structure, and the end of the cross groove is the end of the special-shaped gasket. According to the pilot valve, the oil passing groove is additionally formed in the special-shaped gasket and penetrates through the special-shaped gasket, compared with an existing oil passing groove, the area of the oil passing groove is larger, the oil passing speed is higher, liquid flowing is more convenient, the overall end cap is reduced by 1.5 mm, the axial size occupied by an external valve is further reduced, the rigidity of the special-shaped spring piece is improved, and the service life of the pilot valve is prolonged. According to the pilot valve connector, a pilot valve and a connector are combined into a whole, on the premise that the performance is met, the axial size is reduced, a belleville spring and two special adjusting washers are added, and the better damping effect of the shock absorber is obtained.

The invention provides a tower wind load model test device and test method, the device comprises a tower simulation piece and a damping adjustment unit, the damping adjustment unit comprises an eddy current conductor assembly and an electromagnetic assembly, the eddy current conductor assembly comprises an eddy current conductor and a magnetic back plate, and an air gap is reserved between the electromagnetic assembly and the eddy current conductor. The method comprises the following steps: constructing a tower simulation piece according to a scale ratio, and determining the thickness of a longitudinal main tower rod of the tower simulation piece according to the thickness and the elastic modulus of the longitudinal main tower rod of the tower and the elastic modulus of the tower simulation piece; the critical vortex vibration initial wind speed, smaller than the preset safe wind speed, of the tower is screened out from the vortex vibration initial wind speeds of the tower during vibration of all orders; determining the optimal test simulation wind speed of the tower simulation part according to the critical vortex vibration initial wind speed and the wind speed ratio; and the electromagnetic assembly adjusts the initial damping force of the damping adjusting unit to the target damping force. The method has the advantages of improving accuracy and reliability of test results, reducing potential safety hazards of the tower and the like.

The utility model relates to the technical field of gamepads, in particular to a gamepad with a force feedback mechanism, which comprises a first shell and a trigger key hinged on the first shell, and the force feedback mechanism is mounted in the first shell. A first fixing mechanism, a second fixing mechanism and a third fixing mechanism are convexly arranged on the inner wall surface, surrounding the trigger key, of the first shell at intervals; the driving motor is provided with a second shell, the speed reducer is provided with a third shell, the transmission mechanism is provided with a gearbox, the reset mechanisms are arranged at intervals in a split mode, and the transmission mechanism can abut against and be separated from the trigger key. The gearbox is fixed to the first fixing mechanism, the second shell and / or the third shell are / is fixed to the second fixing mechanism, and one end of the reset mechanism is fixed to the third fixing mechanism. According to the force feedback mechanism fixing structure of the gamepad, stable transmission of force can be guaranteed, the damping effect is better, and the tactile feedback experience of a user is better.

The invention relates to the technical field of steel tower structure installation, in particular to a communication iron tower with a damping structure and a damping installation method. The main damping structure is arranged between the first frame plate and the second frame plate, the body part is hung on the second frame plate, and a first fixing assembly is arranged at the position, corresponding to the bottom end of the main damping structure, of the first frame plate; the auxiliary damping structure is arranged between the second frame plate and the spire and right above the main damping structure, the body part is hung at the bottom end of the spire, and a second fixing assembly is arranged at the position, corresponding to the bottom end of the auxiliary damping structure, of the second frame plate; the auxiliary damping structure is lighter than the main damping structure; the first sliding assemblies are arranged on the edges of the multiple sides of the second frame plate, connected with the main damping structure and used for vertical sliding of the main damping structure; the second sliding assembly is arranged at the bottom of the spire, connected with the auxiliary damping structure and used for vertical sliding of the auxiliary damping structure. The anti-wind communication tower has the effects of enhancing the anti-wind capability of the communication tower and reducing the collapse and damage risks of the communication tower.

The invention relates to the field of machine tool mechanical equipment, and discloses a linear motor double-drive high-precision machine tool which comprises a machine tool body, a stand column, a carriage, a spindle box, an electric spindle, a workbench and a driving device. The machine tool body and the stand column are formed by casting mineral materials and form a machine tool fixing base, the planker moves on the stand column in the X-axis direction through a driving device, the workbench moves on the machine tool body in the Y-axis direction through the driving device, the spindle box moves on the planker in the Z-axis direction through the driving device, and the spindle box is arranged on the planker. An electric spindle is installed in the spindle box, and the driving devices are two sets of linear motor modules which are symmetrically installed. The influence of heat source temperature rise on the machine tool precision is reduced, the influence of driving reverse clearance on the machine tool precision is reduced, the influence of linear motor stator and rotor magnetic attraction on the machine tool precision is reduced, and therefore the geometric precision, the positioning precision, the repeated positioning precision and the minimum feeding amount of the machine tool are improved.

The invention discloses a hindered phenol AO-1010 / nitrile rubber composite damping material and a preparation method thereof. The hindered phenol AO-1010 / nitrile rubber composite damping material comprises a nitrile rubber matrix, zinc oxide, stearic acid, sulfur, carbon black, an anti-aging agent 4020, an accelerant DM, an accelerant TMTD and hindered phenol AO-1010. According to the invention, hindered phenol AO-1010 is adopted to form hydrogen-bond interaction on a nitrile rubber matrix to improve the damping performance of nitrile rubber, and fracture and recovery of hydrogen bonds can greatly improve the friction resistance of molecular chain activity of nitrile rubber, so that the movement of molecular chains is hindered, the friction heating effect between molecules is improved, and the damping performance is better; a proper amount of carbon black is added into the rubber blend, and the carbon black is used as a rubber reinforcing agent, so that the mechanical property of the rubber can be greatly improved, the carbon black has a relatively strong adsorption effect on molten hindered phenol AO-1010, and the compatibility between the hindered phenol AO-1010 and a rubber matrix is indirectly improved; therefore, the rubber can still keep good mechanical properties while having good damping performance.

The invention provides a water-based damping coating and a preparation method thereof, and relates to the technical field of coatings. An amine compound reacts with polyurethane to form a urea bond, so that a highly-crosslinked polyurethane network structure is formed, and the damping performance is enhanced; meanwhile, a modified nano material is introduced to increase the internal friction force of the material, and a dispersed multi-phase structure can also be formed in a polyurethane matrix, so that crack expansion and energy transfer are effectively hindered, and more mechanical energy is consumed; in the introduced surface acid etching hindered phenol / epoxy microspheres, large groups in an antioxidant AO-80 structure can generate internal friction in a deformation process so as to increase energy dissipation; the epoxy resin is used as a matrix of the microspheres, and can form relatively strong interface interaction with a polyurethane matrix, so that energy can be further dissipated, and the damping effect can be enhanced; the surface roughness of the hindered phenol / epoxy microspheres is increased through surface acid etching, and the physical binding force between the microspheres and a polyurethane matrix is enhanced.

The invention relates to the technical field of rubber materials, in particular to a preparation method and application of a fiber-doped rubber material. The preparation method comprises the following steps: plastifying a polyurethane composite material at 100-120 DEG C for 3-5 minutes, adding nitrile rubber, and plastifying for 3-5 minutes to obtain plastified rubber; adding carbon black, a plasticizer, sulfur, an accelerant, metal fibers, zinc oxide and an anti-aging agent into the plasticated rubber, and mixing to obtain mixed rubber; calendaring and molding the rubber compound to obtain the rubber material. The rubber material prepared by the invention not only has excellent mechanical properties and wear resistance, but also has excellent aging resistance, and can be applied to a preparation process of a composite silencing plate, so that the silencing and damping performance of the composite silencing plate is improved.

The utility model belongs to the technical field of pump station maintenance, and particularly relates to a safe hoisting tool for pump station maintenance, which comprises a portal frame and a stabilizing component arranged outside the portal frame, the stabilizing assembly comprises an electric hoist crane, a first rope and a second rope, and the electric hoist crane is installed on the outer side of the end of the portal frame. Through the stabilizing ball and the flow choking ring, when the copper suspension cage shakes under external force, liquid in the stabilizing ball can be driven to shake, due to the chamfers of the flow choking ring, the liquid can easily enter the flow choking ring, the liquid is difficult to flow out of the flow choking ring, and when the liquid easily enters the flow choking ring, the liquid can be prevented from flowing out of the flow choking ring. The stabilizing balls can quickly respond to external vibration or wind action, the stabilizing balls and internal liquid can immediately generate damping force, vibration energy starts to be absorbed and dispersed, shaking caused by the fact that the copper cage is driven by strong wind is reduced, and construction efficiency and life safety of workers are guaranteed.

The utility model relates to the technical field of anti-seismic dampers, and particularly discloses a stable high-fatigue type viscous damper which comprises a movable end and a fixed end, and the movable end and the fixed end are respectively connected with an embedded part. A shell is arranged between the movable end and the fixed end, an inner cavity is formed in the inner side of the shell, a containing cavity is formed in the inner side of the end, close to the fixed end, of the inner side of the inner cavity, and an elastic piece is installed at the containing cavity. A piston rod is arranged at one end of the movable end, one end of the piston rod extends to the inner side of the inner cavity, a push rod is arranged in the middle of the piston rod in the inner cavity, and one or more buffer cylinders are symmetrically arranged relative to the push rod. According to the viscous damper, a good damping effect can be achieved through the telescopic part arranged in the viscous damper and the filled damping medium such as hydraulic oil, and in the later-stage retraction process, the damping enhancing effect can be achieved through combination of liquid and the telescopic part, and the anti-seismic effect is improved.

The invention provides a preparation method of a high-damping titanium alloy ultrafine wire difficult to machine and deform. The preparation method comprises the following steps: (1) smelting a cast ingot; (2) homogenization treatment; (3) forging treatment; (4) groove rolling; (5) cold drawing processing; and (6) annealing treatment. The high-oxygen-content damping titanium alloy is reasonable in conception, and the machining deformation capacity of the high-oxygen-content damping titanium alloy is improved through a component micro-control and heterogeneous structure toughening technology; and by combining the traditional preparation and processing technology of the titanium alloy wire, the difficulty and threshold of material preparation are reduced, the problem of preparation and processing of the high-oxygen-content damping titanium alloy ultrafine wire is solved, and the method is suitable for large-scale production, popularization and application of fasteners, elastic components and the like.

The invention relates to the technical field of vibration isolators, in particular to an air damping vibration isolator. Comprising a shell unit, a first damping unit, a piston unit and an exhaust unit. The Tesla valve channel of the first damping unit is arranged on the shell unit. The first end of the Tesla valve channel is communicated with the inner cavity of the shell unit, and the second end is communicated with the outside of the shell unit. The piston unit is movably inserted into the shell unit. A containing cavity is formed between the piston unit and the shell unit. The containing cavity is communicated with the first end. The first surface of the shell unit and the second surface of the piston unit can slide relatively. One end of the first exhaust part communicates with the Tesla valve channel, and the other end of the first exhaust part penetrates to the first surface. One end of the second exhaust part penetrates to the second surface, and the other end penetrates to the outside of the shell unit. And when the shell unit and the piston unit slide relatively, the first exhaust part and the second exhaust part are communicated or staggered. Therefore, the problem that the service life of the vibration isolator is short is solved.

The invention provides a power transmission line vibration suppression device and method based on inertial mass and electromagnetic damping. The power transmission line vibration suppression device comprises a spacer, a connecting frame, an electromagnetic damper, a balancing weight and a transmission mechanism. The electromagnetic damper comprises a permanent magnet assembly and a conductor disc for cutting magnetic induction lines, and the transmission mechanism is connected with the balancing weight and the conductor disc and used for converting reciprocating linear motion generated by the balancing weight under the vibration effect into circular motion in different rotation directions and driving the conductor disc to rotate to cut the magnetic induction lines. According to the device and the method, the balancing weight is adopted to provide directional torque for restraining torsion of the power transmission line, the balancing weight does reciprocating rectilinear motion and drives the electromagnetic damper, so that the damping effect is remarkably improved, vertical vibration energy is consumed, vibration can be rapidly stopped, vertical vibration and torsional vibration of the multi-split power transmission line are restrained at the same time, and the reliability of the device is improved. Damage to the sub-conductors, the sub-conductor spacers and the phase-to-phase spacers is avoided, and safety and stability of power supply are guaranteed.

The utility model provides a magnetorheological fluid damper, which belongs to the technical field of dampers, and comprises a shell, magnetorheological fluid, a plurality of magnetic parts, a plurality of elastic elements, a plurality of elastic elements, a plurality of elastic elements and a plurality of elastic elements, the rotating rod is rotationally arranged in the shell, the extending end of the rotating rod is rotationally connected with the shell through a thread structure, and when the rotating rod is subjected to axial force, the rotating rod can rotate on the shell through the thread structure; the detection piece is arranged on the shell, the rotating rod is matched with the detection piece, and when the rotating rod axially moves relative to the shell to abut against the detection piece, the detection piece can generate an optical signal according to the abutting pressure of the rotating rod; according to the utility model, when the rotating rod abuts against the detection piece, the detection piece generates an optical signal, so that the stress condition of the rotating rod at the moment can be calculated according to the abutting pressure recorded by the detection piece, the working state of the damper under the vibration condition is recorded, and whether the damper is in a healthy qualified state or not is judged after vibration.

The present application belongs to the technical field of carbon fiber composite materials, and particularly relates to a carbon fiber composite material with high-frequency damping performance and a preparation method thereof. Through multi-component synergistic modification of an epoxy resin matrix, a nitrile rubber composition and a boron nitride composition, combined with carbon fiber surface treatment and a segmented curing process, a multi-scale damping energy dissipation network is constructed. The material exhibits excellent damping performance in a high-frequency vibration environment, while also having high mechanical strength and interfacial bonding force, which can significantly reduce the damage risk caused by vibration transmission of sports equipment, and is suitable for high-end sports equipment field, promoting the industrial application of carbon fiber composite materials in high-frequency damping scenarios.

The invention relates to the field of coating preparation, in particular to a water-based coating based on modified acrylic resin and a preparation method thereof.Core-shell type acrylate and water-based acrylic resin are mixed to serve as basic emulsion, and on one hand, the core-shell type acrylate can increase the uniform dispersity in a system; in addition, an acrylic polymer with a four-layer core-shell structure is introduced into a system as a cross-linking agent, and the multi-layer core-shell structure can be used for toughening and modifying the water-based acrylic resin; the tensile strength, the impact strength and the hardness of the water-based paint can be effectively improved due to various aromatic ring rigid structures contained in the water-based paint, and in addition, the water-based paint can have relatively high flame retardance and further interact with basic emulsion, so that the damping performance is enhanced, and meanwhile, the corrosion resistance is further improved.

The application discloses a liquid metal bearing for an X-ray tube and the X-ray tube, relates to the technical field of X-ray tubes, and solves the technical problems of short service life and poor heat dissipation effect of the bearing. The liquid metal supporting bearing comprises a bearing sleeve, a mandrel, liquid metal and a microporous structure; the bearing sleeve is sleeved outside the mandrel, and a gap is arranged between the bearing sleeve and the mandrel; the liquid metal is filled in the gap; the microporous structure is arranged on the inner surfaces opposite to each other of the bearing sleeve and the mandrel and / or the outer surfaces opposite to each other of the mandrel and the bearing sleeve, the microporous structure is formed by a plurality of micropores arranged in an array, and the microporous structure has a protruding direction consistent with the flowing direction of the liquid metal. The liquid metal distribution is optimized through the micropores and optional microslit structures between the bearing sleeve and the mandrel, the friction coefficient is reduced, the heat dissipation performance is enhanced, and the service life and the heat dissipation effect of the bearing can be remarkably improved.

The utility model relates to the technical field of automobile parts, in particular to a novel damper. A novel damper comprises a shell and a rotor, a check ring is inwards formed at the bottom of the shell, a damping cavity is formed between the inner wall of the shell and the check ring, an end cover is arranged on the upper portion of the rotor, an annular rotating core is arranged on the lower portion of the rotor, the rotating core is coaxially installed in the damping cavity, and damping liquid is injected into a gap between the damping cavity and the rotating core. The outer wall of the upper portion of the rotating core is transversely recessed to form a recessed groove, and the bottom end of the rotating core is provided with a damping notch communicated with the inner cavity. The rotating core has the advantages that the structure is novel, the design is ingenious and simple, the concave groove is formed in the upper portion of the rotating core, and the damping notch is formed in the lower portion of the rotating core, so that even resistance is obtained in the rotating process of the rotating core 4 due to the fact that flowing of damping liquid is blocked, the damping effect is lasting, and the service life is long; the damping gap enables the inner cavity of the rotating core 4 and the damping oil to generate a damping effect, so that the resistance is further more uniform.

The invention discloses a preparation method of a wide-temperature-range high-damping metal hollow sphere / polyurethane damping composite material, and relates to a preparation method of a damping composite material. The method comprises the following steps: 1, carrying out surface modification on metal hollow spheres; and 2, preparing the polymer. Compared with pure polyurethane, the prepared wide-temperature-range high-damping metal hollow sphere / polyurethane damping composite material has the advantages that the damping performance is greatly improved, the temperature range is widened, the excellent damping performance and acoustic performance are achieved, the preparation process is simple, the stability is high, and the composite material is suitable for large-area pouring and complex-shape base materials; wide application prospects are realized in the fields of ships, aerospace, vehicles, building materials and the like; after the surface-modified metal hollow spheres are compounded with polyurethane, the damping performance can be greatly improved, the temperature range is widened, the loss factor is increased from 0.45 to 0.85, and the effective temperature range is widened from 59.9 DEG C to 100 DEG C or above.

This utility model relates to the field of piston surface grinding technology and discloses a high-precision grinding device for piston surfaces, including a U-shaped equipment frame, a first linear guide rail, and a second linear guide rail. Two slide rails are provided at the bottom of the inner cavity of the U-shaped equipment frame, and a fixing component is provided in the middle of the U-shaped equipment frame. A driving device is provided on each of the two second linear guide rails. A surface cleaning rod is fixedly connected to the output end of one of the driving devices. The fixing component includes a sleeve located at the bottom of the inner cavity of the U-shaped equipment frame. A piston block is provided in the middle of the inner cavity of the sleeve. A hydraulic groove is formed on the surface of the sleeve. An installation ring is fixedly connected to the bottom end of the sleeve, and a replacement head is fixedly connected to the middle of the installation ring. A sealing ring is fixedly connected to the inner wall of the replacement head. The device can be flexibly adjusted to adapt to the processing needs of various pistons, enabling rapid model changeover.

The utility model discloses a kind of anti-slip wire reinforcing rib square tubes with stretch hole structure, it is related to square tube field, including square tube body, the surface of square tube body is equipped with stretch hole at equal intervals, and square tube body surface is provided with wide hole, and square tube body inside is provided with support mechanism, and support mechanism provides support force for square tube, the surface of square tube body is provided with protection mechanism, and protection mechanism protects square tube body. The anti-slip wire reinforcing rib square tube with stretch hole structure, the surface of square tube body is equipped with stretch hole with the diameter of 4.5mm at equal intervals, the interval between adjacent stretch hole is multiple of 12.5mm, to effectively prevent the phenomenon of slippage;Meanwhile, the surface of square tube body is also arranged wide diameter hole with the diameter of 9.5mm at equal intervals, the interval of adjacent wide hole is multiple of 200mm, by the setting of such stretch hole structure, further enhance the effect of anti-slip.

The invention provides a bending-torsion composite shock absorber structure of a rotor system and a shock absorption method of the bending-torsion composite shock absorber structure, and relates to the technical field of bending-torsion composite shock absorption. According to the bending and twisting composite shock absorber structure of the rotor system and the shock absorption method of the bending and twisting composite shock absorber structure, the bending and twisting composite shock absorber structure of the rotor system comprises a mounting outer disc, a plurality of damping shock absorbers and an outer support, the damping shock absorbers are mounted in the mounting outer disc and distributed in a circumferential array mode, and the outer support is mounted on the inner sides of the damping shock absorbers; the driving disc assembly comprises a driving disc body, a plurality of key grooves used for being connected with a driving shaft of the rotor system are formed in the outer surface of the driving disc body, a friction plate is fixedly connected to the center of the front side wall of the driving disc body, and a connecting circular ring is fixedly connected to the position, located on the outer side of the friction plate, of the front side wall of the driving disc body. The distance between the two movable limiting blocks is adjusted, so that the relative rotation angle of the driving disc and the driven disc is changed, and then different working conditions and load changes are adapted.