38results about How to "Improve vibration damping performance" patented technology

The invention discloses a semi-active particle vibration damping device with a truss structure. The truss structure is connected with a structure to be damped, the vibration damping device comprises magnetic-permeable metal particles, a coil, a current control module, a vibration pickup sensor and a direct-current power module, the magnetic-permeable metal particles are filled in a hollow steel tube of the truss structure, the coil is wound on the outer wall of the hollow steel tube, the current control module is connected with the coil, the vibration pickup sensor is disposed on the structure to be damped, and the current control module receives vibration signals picked up by the vibration pickup sensor and controls the direct-current signal module to output corresponding current to the coil after the vibration signals are processed. The vibration frequency of the structure to be damped can be tracked, the optimal damping ratio of a particle damper can be quickly adjusted, and accordingly the vibration attenuation performance of the semi-active particle vibration damping device within a broader frequency band range is improved. In addition, the semi-active particle vibration damping device is simple in structure and high in adaptability, and an extra space is omitted.

A vibration damping device including a first mounting member arranged on a lower side of a second mounting member, the first and second mounting members being elastically connected by a main rubber elastic body, and an outer bracket arranged on the lower side of the second mounting member. A coupling part is constituted by engagement between a bottom edge of the second mounting member and a top edge of the outer bracket, and the second mounting member is configured to be attached to a vibration source via the outer bracket. The outer bracket is arranged in opposition to the first mounting member in an axis-perpendicular direction, and an axis-perpendicular stopper member that regulates relative displacement between the first and second mounting members in the axis-perpendicular direction is constituted by contact between the first mounting member and the outer bracket.

The rolling bearing includes an inner ring, and an outer ring which is arranged in a concave part which is formed in a fixing member so as not to rotate in a state preloaded in an axial direction toward the inner ring by way of a rolling element, with the fixing member at a bottom surface of the concave part. Moreover, a vibration isolating part formed of a laminated body including a pair of metal layers and a resin layer which is thinner than these metal layers and interposed between them is press clamped to be disposed between an end surface of the outer ring at a preloaded side in the axial direction and the bottom surface of the concave part, in such a manner that a direction of lamination may coincide with the axial direction.

A triaxial optical fiber gyro structure taking eight-point vibration reduction and accelerometer heat-insulation measures comprises a body (1), a first gyro (2), a second gyro (3), a third gyro (4), a first circuit box (5), a second circuit box (6), a third circuit box (7), an accelerometer assembly (8), a circuit box installing supports (9) and vibration reducers (10). The body (1) is a hexahedron frame, eight vibration reducers (10) are installed at eight corners of the body (1) respectively, and the balancing is performed through position adjustment of each assembly, so that the geometric center C1 of the eight vibration reducers and the mass center C2 of all components coincide. No counterweight is added in the mass center adjusting process, the occurrence of liner vibration and angular vibration coupling is avoided effectively, and the vibration reduction performance is improved. A heat-insulation gasket and a silica gel layer are adopted for double-layer heat insulation for the accelerometer assembly (8), the starting heating time of the accelerometer assembly is reduced obviously, and the total power consumption of a gyro assembly is lowered.

The invention discloses a coconut-fiber-reinforced crop straw composite material and a manufacture method thereof, aiming to provide the strong-toughness and environment-friendly biomass composite material having good mechanical property, gluing property, toughness and vibration damping property. The coconut-fiber-reinforced crop straw composite material is formed by adding coconut fibers in crop straw units and uniformly dispersing as well as crossing and interconnecting the coconut fibers in a composite material system to form a bulky mesh structure, wherein the mass fraction of the coconut fibers in the system is 10-50%. The manufacture method comprises the following steps of: preparing and preprocessing of the straw units, preparing of the coconut fibers, unit mixing, gluing, paving and billet assembling, prepressing, hot-press or cold-press molding, postprocessing and the like. The coconut-fiber-reinforced crop straw composite material is free from isocyanate adhesives, so that the preparation cost of an artificial board can be reduced; and the coconut-fiber-reinforced crop straw composite material can be used as a structure material and a damping material and applied to bearing structures and in rigid use environments with frequent vibration fatigue actions and easily occurring impulse loads so as to play roles of bearing, supporting, damping and denoising, and thus, the application field of the crop straw artificial board is enlarged.

The invention discloses a damper with two-way throttle valves and an air spring. The air spring is arranged outside a dual-cylinder oil gas damper to form a composite damping structure; the dual-cylinder oil gas damper uses a piston with multiple two-way throttle valve structures on the basis of the traditional damper. The traditional dual-cylinder hydraulic damper is improved, and the throttle valves are additionally arranged on the work piston so as to realize the automatic control on the liquid flow; the dual-cylinder oil gas damper and the external air spring can synchronously bear a load by adjusting the rigidity of throttle valve springs, so the composite damping device with the true meaning is formed; the graded damping effect of the bag-type air spring with three air bags is achieved by adjusting the initial air pressure and the size of the air bags and the integral damping performance of the damper is improved; the energy loss of the damper is reduced by setting the throttle valves under the condition that the damping performance is not affected.

The invention provides a vibration-absorbing silicone gel composition mainly comprising: 100 parts by weight of (a) an organopolysiloxane having a (meth)acryloyl group in its molecule; from 5 to 100 parts by weight of (b) an organopolysiloxane unreactive with ingredient (a); from 1 to 50 parts by weight of (c) an amorphous pulverization product of a three-dimensionally crosslinked silicone resin; from 1 to 20 parts by weight of (d) a fumed silica; and an effective amount of (e) a polymerization initiator, as a gel composition which has high vibration-absorbing properties and high shape retention and which can be used as, e.g., a vibration-absorbing damper even when it is not sealed up in a container or bag.

The present invention discloses a thermoplastic composition with characteristics of excellent vibration damping and noise inhibition, and a molding product prepared from the thermoplastic composition in a low cost manner. The noise damping thermoplastic composition contains (a) 75-98.9 wt% of fiber reinforcement agent-containing polyamide,; (b) 0.5-10 wt% of an impact modifier, (c) 0.5-5 wt% of nanometer clay, (d) 0.1-10 wt% of polyolefin, and (e) 0-15 wt% of other additives, wherein the component (d) polyolefin is not polyethylene.

A secondary balancer is used for an outboard motor vertical in-line engine which includes a crankcase, a cylinder block and a cylinder head, which are arranged in this order from a front side of the engine (i.e., hull side of an outboard motor), a crankshaft placed in the engine in a substantially vertical direction, an intake pipe placed on one side of the engine, a throttle body and an intake silencer which are disposed on a front side of the crankcase, and a balancing device including a primary balancer and a second balancer. The secondary balancer includes a pair of balancer shafts disposed in a space formed between the crankcase and the intake silencer.

It is an object of the present invention to provide a vibration damping composition having a high loss tangent (tan delta) and loss factor (eta), and serviceable over a wide temperature range. Provided is a vibration damping composition whose matrix material of organic polymer contains a vibration damping agent, and inorganic and/or organic filler, wherein the vibration damping agent is a phenol-based compound of limited steric hindrance which has a chemical composition free of a branched hydrocarbon group of 4 or more carbon atoms at each site adjacent to the hydroxyl group.

The invention discloses heat preservation oscillation damping light concrete. The concrete is prepared from, by weight, 110-140 parts of cement, 40-90 parts of coal ash, 10-30 parts of potassium hydroxide, 20-30 parts of mineral powder, 10-15 parts of polypropylene granules, 5-15 parts of cooked glutinous rice powder, 0.5-2 parts of thickener and 300-350 parts of water. The materials are selectedfinely, the preparation method is scientific, the coal ash and the potassium hydroxide are subjected to a chemical reaction under the steam curing condition, a compound with the water hardening gelling property is generated, the temperature of the concrete is increased, the heat preservation property of the concrete is improved, by adding the cooked glutinous rice powder, the raw materials of thelight concrete can be condensated, the oscillation damping effect is enhanced, tenacity can be improved due to polypropylene, and the concrete is high in bearing capacity, light in structure, low in cost and worthy of being popularized.

The invention discloses a vibration reduction rotor assembly and a motor. The vibration reduction rotor assembly comprises a rotor iron core, a permanent magnet, a rotating shaft and a first end vibration reduction piece. The rotor core is provided with magnet grooves and a rotating shaft hole. The permanent magnets are arranged in the magnet grooves. A rotating shaft is arranged in the rotating shaft hole. The first end and the second end of the rotating shaft extend out of the rotating shaft hole. A gap is formed between the rotating shaft and the rotor core. The first end part vibration reduction piece is arranged on the first end surface of the rotor iron core and is connected with the rotor iron core. On the axial direction of the rotor core, the first end of the permanent magnet extends out of the magnet groove and is matched in the first end vibration reduction piece or the first end of the permanent magnet retracts into the magnet groove so that one part of the first end vibration reduction piece can be matched in the magnet groove, and the first end vibration reduction piece is directly matched with the rotating shaft or matched with the rotating shaft through a first transmission piece arranged in the first end vibration reduction piece. According to the vibration reduction rotor assembly, the material amount of the vibration reduction part can be increased, the vibration reduction performance is good, and the vibration noise is low.

A flexible shaft coupling has first and second hubs, each of which is provided with flanges and connected to a transmission shaft. The flange of the first hub has spring holes extended therethrough. A cover fixed to the second hub so that the flange of the first hub is held between the cover and the flange of the second hub, and the cylindrical part of the first hub extends through the cover. A plurality of coil spring sets each comprises multiple barrel-shaped coil springs. Each of the coil springs is supported in the spring hole so that the adjoining end faces thereof are in contact and in series with each other.

The invention relates to a microporous elastomer with the high vibration reducing performance and a preparation method thereof. The microporous elastomer is mainly characterized by being prepared from, by mass, 55 parts of ethylene propylene diene monomer rubber, 45 parts of an ethylene-vinyl acetate copolymer, 10-15 parts of talcum powder, 5-10 parts of calcium carbonate, 2-5 parts of an anti-aging agent, 3-5 parts of zinc oxide, 1-3 parts of stearic acid, 0.5-1 part of an accelerant, 1-3 parts of sulphur, 0.5-1 part of peroxide and 3-8 parts of a foaming agent. The microporous elastomer prepared through the method has the advantages of being small in hardness, high in elasticity, good in vibration reducing performance, stable in size, excellent in mechanical property, good in softness and wearing comfortableness and the like and can be used for manufacturing shoe soles with the high requirements for the vibration reducing performance.

The invention discloses a cooling structure of a motor, which comprises a motor body, wherein the outer side of the motor body is provided with a main cooling mechanism, a connecting mechanism and anauxiliary cooling mechanism; the main cooling structure comprises a motor shaft, a first fixing ring, a first draft fan blade, a second fixing ring, a second draft fan blade, a third fixing ring, a third draft fan blade, a first bearing, a second bearing, a first rotating rod, a second rotating rod, a first bevel gear, a second bevel gear and a third bevel gear. According to the invention, the first bevel gear on the motor shaft and the second bevel gear and the third bevel gear on the motor body are arranged, and the three bevel gears can be driven to rotate when the motor shaft rotates, so that the first draft fan blade, the second draft fan blade and the third draft fan blade rotate are enabled to rotate, air draft is conducted from the upper side, the lower side and the right side at the same time to perform cooling on the motor. In addition, extra driving equipment is not needed, and energy is saved.

The invention discloses a large-span heavy gantry numerical control machine tool. An unloading beam made of polymer concrete materials is arranged in a hollow cavity of a beam of the large-span heavygantry numerical control machine tool. Supporting bases upwards penetrating through the beam are arranged at the two ends of the unloading beam correspondingly and provided with sliding wheels. A balance rope is wound around the sliding wheels, the first end of the balance rope is connected to the part, on the outer side, of the unloading beam, and the second end is connected to the part, on the inner side, of the unloading beam. According to the large-span heavy gantry numerical control machine tool, on one hand, the middle portion of the unloading beam can be upwards jacked by adjusting thetightness of the balance rope, the force is transmitted to the beam through an adjusting screw, the deflection of the beam can be effectively balanced, the moving linearity of a transverse moving sliding base on the beam is improved, and accordingly the machining precision of the machine tool is improved; and on the other hand, good strength of stand columns and the beam made of cast iron materials is sufficiently utilized, due to the character of excellent vibration damping performance of the unloading beam and a supporting core column made of the polymer concrete materials, vibration absorption is accelerated, the two parts are combined, and mutual complementation is achieved.

The invention discloses a centrifugal device for treating the inner surface of a pipe, and belongs to the technical field of pipe processing. The device comprises a base body and a mechanical arm; thebase body is provided with a through hole for placing the pipe; the mechanical arm is mounted on the base body and is used for clamping a polishing assembly and driving the polishing assembly to rotate to polish the inner wall of the pipe, and a gap between the pipe and the through hole in the base body is filled with a fastening piece; and the fastening piece comprises a first ring body connected to the outer wall of the pipe in a sleeving manner, the first ring body is connected with a coaxial second ring body, the upper and lower ends of the second ring body are unequal in diameter, the end with the smaller diameter is connected to the first ring body and is equal to the first ring body in diameter, the second ring body is divided into a plurality of segments from a notch, and a notchin the first ring body corresponds to the notch in the second ring body. According to the centrifugal device, in the process of treating the inner surface of the pipe, the vibration of the pipe is effectively reduced, the rate of adhesion between cleaning debris on the inner surface of the pipe and the inner wall of the pipe is low, and the quality of the inner surface of the processed pipe is high.

The invention discloses a multi-state parallel multi-degree-of-freedom motion platform based on piezoelectric driving, and belongs to the technical field of motion mechanics. The multi-state parallelmulti-degree-of-freedom motion platform based on piezoelectric driving has two motion states of stepping and scanning. The multi-state parallel multi-degree-of-freedom motion platform based on piezoelectric driving comprises a static platform, a moving platform placed coaxially parallel to the static platform and six linear driving assemblies disposed between the static platform and the moving platform, and two ends of each linear driving assembly are connected with the lower end surface of the moving platform and the upper end surface of the static platform through spherical bearings; the linear driving assemblies comprises end covers, actuator protective shells, piezoelectric inchworm-type actuators, couplings, bearings, output shafts, output shaft shells and bearing end covers. The piezoelectric inchworm-type actuators comprise tracks, flexible members, armatures, electromagnets, elongated piezoelectric stacks, strain gauges, axle sleeves and actuating shafts. Clamping mechanisms comprise electromagnets, armatures and flexible members. The strain gauges are pasted on the elongated piezoelectric stacks, one ends of the actuating shafts are fixed to the back of one of the clampingmechanisms, and the other ends of the actuating shafts are supported by the axle sleeves.

The invention discloses a shock absorbing pad for a treadmill and a preparation method thereof, belonging to the field of shock absorbing pads. A treadmill shock absorbing pad includes a rubber lay, asound-adsorbing layer and a buffer layer. The sound-absorbing layer is arranged at the upper end of the rubber layer, the buffer layer is arranged at the lower end of the rubber layer, the rubber layer is rectangular, the buffer layer comprises four groups of rubber seats and a plurality of adsorption disks, the four groups of rubber seats are respectively arranged at four right angles of the lower end of the rubber layer, and each group of rubber seats comprises 4-8 round table-shaped rub bases, wherein a spring is arranged in that round table-shaped rubber bases, the adsorption disk is uniformly arranged at the lower end of the rubber layer, the sound-absorbing layer is in the shape of a square ring, and the sound-absorbing layer is composed of hollow glass micro beads and expanded perlite. The treadmill shock absorbing pad has excellent vibration absorbing performance and sound absorbing performance, and is suitable for use in a gym and a treadmill in a family.