67results about How to "Achieve vibration and noise reduction" patented technology

The invention discloses a low-noise axial plunger pump based on an indexing angle of pumps in series, mainly comprising a main shaft, a bearing, a shell body, a bolt component, a connecting body, an inclined disc, a back-stroke tray, a plunger, a flow distribution plate, a cylinder body and a slippage shoe. The axial plunger pump is provided with two sets of rotor structures which consist of the sliding shoe, the plunger, the cylinder body and the flow distribution plate, an oil sucking hole and an oil discharging hole are shared by two rotor structures, the indexing angle exists between two rotor structures, therefore, a fixed phase difference exists between the dynamic changes of oil discharging quantities of two rotor structures, when two oil flows is converged at the oil discharging hole position, an average effect is generated, the actual exit flow pulsation of the axial plunger pump is reduced by more than 50%, the fluid noise of flow pulsation as a shock excitation source is greatly reduced.

The invention relates to the field of permanent magnet motors and discloses a high-power density permanent magnet motor. The high-power density permanent magnet motor comprises a case, a stator core,an asymmetric hybrid rotor core, permanent magnets, a shaft, windings and insulating frames, wherein a contact area is formed at the contact part of the stator core and the case and filling areas areformed in gaps between the stator core and the case; the asymmetric hybrid rotor core comprises a rotating shaft sleeve ring, a shaft hole, sectors, connection bridges and support bosses; and the adjacent sectors have different plane structures. According to the high-power density permanent magnet motor, the production process of the motor can be simplified and the structural strength of the motorcan also be improved.

The invention relates to a grain selection system having the functions of distributing materials uniformly and pre-selecting. The system includes a material vibrating plate, a selection sieve and a fan. The material vibrating plate is composed of a vibrating plate surface, a vibrating plate guide strip, a vibrating plate weight counterweight wheel, a vibrating plate chain wheel and a vibrating plate counterweight sheet. When grain is selected, the grain is distributed uniformly in the radial direction of the selection mechanism, pre-selection can be conducted on materials, a part of the grain can pass through the sieve in advance, the selection pressure of a rear-portion selection mechanism is thus reduced, and the selection efficiency is largely improved. By additional installing sheet-like adjustable counter weights on power input parts of the material vibrating plates and the selection sieves, the inertia force of the selection mechanism can be reduced by adjusting the counter weights, and the effect of reducing vibration and noise is thus achieved.

The invention provides a noise reduction device and a noise reduction method for long-stroke large-diameter hydraulic cylinder honing processing procedure. The noise reduction device is composed of an intelligent control system and an annular support device. During the first working operation of the honing processing, the intelligent control system collects audio signal generated in the honing processing process through a sound pick-up and records the time required by a single working operation; an audio frequency recognition algorithm module is used for recognizing the noise spike appearing time; a support position computing module is used for computing position needing to reduce vibration and noise and add the support point. The noise amplitude-displacement diagram is displayed in a human-computer interaction unit of the intelligent control system and the position for adding support point in a numerical value manner. The number of the support point can be set by the operator through the human-computer interaction unit of the intelligent control system. During the honing processing period, the vibration and noise can be reduced in the honing processing process by moving or adding the annular support device to the position point given by the intelligent control system.

The invention discloses a steel rail damper. The damper includes at least one cavity structure; the cavity structures are provided with fillers; and the fillers can be fluidly arranged in the cavity structures. The damper can be commonly formed by the cavity structures and discrete particles, so that the damper can absorb the vibration of a steel rail through a principle of a dynamic vibration absorber and also can absorb the vibration of the steel rail through a principle of particle damping; and with the existence of particle damping, the vibration absorption efficiency and vibration absorption bandwidth of the damper can be enhanced, and better vibration absorption effects can be generated.

The invention relates to the field of permanent magnet motors, and discloses a built-in permanent magnet motor. The built-in permanent magnet motor comprises a case, a regular polygonal stator iron core, an asymmetric hybrid rotor iron core, permanent magnets, a shaft, windings and insulating frames. The regular polygonal stator iron core is defined by a plurality of T-shaped tooth connection yokes. The contact part of the regular polygonal stator iron core and the case forms a contact area, and a gap between the regular polygonal stator iron core and the case forms a filling area. The asymmetric hybrid rotor iron core comprises a shaft sleeve, a shaft hole, a fan area, connecting bridges and supporting protrusions and contains full-connecting-bridge-type laminations and a half-connecting-bridge-type lamination. The full-connecting-bridge-type laminations are located at the two ends of the asymmetric hybrid rotor iron core, and the half-connecting-bridge-type lamination is clamped by the full-connecting-bridge-type laminations in a wrapped mode in the axial direction. Tooth parts of all the T-shaped tooth connection yokes are wrapped with the insulating frames. The windings are wound around the insulating frames. According to the built-in permanent magnet motor, the production technology of the motor can be simplified, and the structural strength of the motor can also be improved.

The invention provides a composite damping material and a preparation method thereof. The composite damping material provided by the invention comprises a polymer matrix and nano heteropoly acid particles dispersed in the polymer matrix, the polymer has a structure as shown in a formula (1). According to the invention, a specific acrylate compound structure is combined with a specific vinyl heterocyclic structure; wherein the vinyl heterocyclic structure can provide association sites, then the polymer with the specific structure is combined with the nano heteropoly acid particles, a pluralityof association sites exist between a polymer molecular chain and the heteropoly acid particles, and physical association-ion interaction is generated; when the composite damping material receives external stimulation under a high-temperature condition, energy can be dissipated through disassociation between macromolecular chains, so that an excellent damping effect is achieved; in addition, the composite damping material provided by the invention also has a good damping effect at a low frequency, and vibration and noise reduction can be effectively realized in a relatively wide frequency range.

The invention discloses a method for reducing the vibration of a vehicle driving shaft, which comprises the following steps: measuring the main vibration frequency of the vehicle driving shaft; designing the size of each part of a shock absorber of the vehicle driving shaft; manufacturing a shock absorber shell, a shock absorber cover and middleware; installing the middleware in the shock absorber shell; filling the gap between the middleware and the shock absorber shell with lubricating oil; buckling the shock absorber cover on the shock absorber shell; and finally assembling the components on the vehicle driving shaft together. The invention also discloses the shock absorber for the vehicle driving shaft, which comprises the middleware, the shock absorber shell and the shock absorber cover, wherein the shock absorber shell is buckled with the shock absorber cover to form an annular enclosed space to receive the middleware; and the lubricating oil is filled between the middleware and the shock absorber shell. With the technical proposal of the invention, the method for reducing the vibration of the vehicle driving shaft and the shock absorber for the vehicle driving shaft can better absorb vibrations and noises transmitted by the vehicle driving shaft in a wider frequency range due to the application of the damping characteristic of the lubricating oil in vibrating to absorb the vibrations and the noises, thereby greatly improving the riding comfort of the vehicle.

The invention relates to the technical field of train vibration reduction and noise reduction, in particular to a permanent magnetic levitation vibration reduction and noise reduction device for train cars, characterized in that: the device is installed between the train car and the train bogie, including a suspension car base and a suspension box, the base of the suspension car is arranged at the bottom of the train car, the suspension box is connected with the train bogie, the base of the suspension car has a first magnet, and the inside of the suspension box has a second magnet , the base of the suspension car is suspended inside the box body of the suspension box through the magnetic repulsion force generated when the same magnetic poles between the first magnet and the second magnet are opposite, so that the train car and the train There is absolutely no contact between the bogies. The invention has the advantages of simple structure, convenient realization, safety and reliability; during the running process of the train, the transmission of vibration and noise from the bogie to the carriage is completely cut off.

The invention discloses a multi-working-condition active vibration reduction control method for a hybrid power system based on vibration reduction waveforms, and relates to the field of new energy hybrid power system electronic control. According to the method, fluctuation torques on an electromechanical coupling shaft of the hybrid power system in different operation states are tested in a test bench, and vibration reduction compensation waveforms corresponding to different working conditions are designed in an off-line mode; a crankshaft position sensor and a rotary transformer are used for collecting signals of positions, rotating speeds and the like of an engine crankshaft and a motor rotor in real time, and the state and working condition points of a hybrid power system are judged online in real time in combination with an engine throttle target instruction; and the amplitude and phase of the fluctuation torque are estimated, a prefabricated vibration reduction compensation waveform is matched, the motor is enabled to superpose the torque of the vibration reduction waveform on the target torque to realize active vibration reduction, and the vibration reduction waveform is switched in real time along with the change of working conditions. The torque ripple suppression of the hybrid power system under multiple working conditions can be realized according to the operation state, and the driving comfort and the safety and reliability of parts are improved.

The invention discloses a switched reluctance motor vibration and noise reduction method based on motor structure characteristics. The method comprises constructing a transfer function H (s) between aswitched reluctance motor stator vibration acceleration a (s) and a radial force F (s); determining parameters of the transfer function; drawing a Bode diagram of the transfer function H (s) throughmatlab; finding the frequency corresponding to the minimum value of the transfer function H (s) H (s) in the interval [fn fm] in the Bode diagram; finally, based on a conventional switched reluctancemotor control strategy, injecting sinusoidal signals with frequency changes into the turn-off angle theta off of the traditional switched reluctance motor, so that a new turn-off angle is generated. Thus, the switched reluctance motor achieves uniform distribution of motor vibration energy under the control of the turn-off angle theta' off, and then vibration and noise reduction of the switched reluctance motor are achieved.

The invention discloses a multi-mass-sheet two-side clamping device for rail vibration reduction. The multi-mass-sheet two-side clamping device comprises elastomers, supports, elastomer-steel member assemblies, pressing plates, first locking pieces, second locking pieces, pressing bars with pressing ends, leaf springs and rail gaskets, wherein the elastomers, supports, the elastomer-steel member assemblies, the pressing plates, the first locking pieces, the second locking pieces and the pressing bars with pressing ends are arranged on the first side and the second side of a rail, and the leafsprings and the rail gaskets are located on the pressing plates and the elastomer-steel member assemblies; the spring gaskets and the elastomer-steel member assemblies are attached to the rail, so that the vibration impact of a train on the rail is retarded; the elastomer-steel member assemblies increase structural damp of the rail and adjust the vibration frequency of the rail to be close to thefrequency of a main structure, and the resonance characteristic of the structure is changed, so that the vibration reduction and noise reduction effects are achieved. The multi-mass-sheet two-side clamping device can greatly reduce the energy transmitted by wheels and the rail, prevents the generation of vibration and noise, greatly prolongs the service life of the wheels and the rail, is beneficial to reduction of the use cost of a railway and noise pollution, is convenient to replace and disassemble, and has a very strong practical value and application prospect.

The invention discloses a power vibration absorbing energy consuming device for delaying steel rail corrugation development. Two resonators symmetrically arranged on the two sides of a steel rail areincluded and connected to a rail web of a steel rail. The vibration frequency of the resonators is set to the predominant frequency due to forced vibration caused by steel rail corrugation when a train passes through the corresponding position. Each resonator is connected with at least one power vibration absorber. By application of the power vibration absorbing energy consuming device for delaying steel rail corrugation development, the resonators are arranged on the two sides of the rail web of the steel rail, the steel rail vibration energy is led to the resonators, the power vibration absorbers connected to the resonators are utilized for absorbing and consuming vibration energy, and accordingly the purpose of reducing steel rail vibration is achieved. Since the vibration frequency ofthe resonators is set to the steel rail corrugation frequency at the corresponding position, the device can effectively restrain harmful vibration of the steel rail at the corrugation frequency band,the purpose of reducing steel rail corrugation development is achieved, and the device is simple in structure, convenient to use and good in effect.

The invention relates to the technical field of structural dynamics, in particular to an optimal design method of a curved bar periodic structure based on a band gap. The curved bar periodic structurecomprises a plurality of unit cell models which are connected with one another, each unit cell model comprises two curved bars which are intersected with each other and are in rotational symmetry, and the optimal design method comprises the following steps: taking the curvature of each curved bar as a design variable, and limiting the value range of the design variable; calculating a mass matrixof the unit cell models and a rigidity matrix of the unit cell models based on the design variables; establishing a frequency wave vector equation of the unit cell models based on the mass matrix of the unit cell models and the rigidity matrix of the unit cell models; solving the frequency wave vector equation to obtain a response relationship between the design variables and the band gap frequency of the curved bar periodic structure; and substituting the design variables into the response relationship and calculating the minimum value of the band gap frequency. According to the optimizationdesign method, the curved bar periodic structure can be optimized on the basis of elastic wave propagation characteristics, so that vibration and noise reduction of the curved bar periodic structure in a low-frequency range is realized.

The invention discloses an air conditioner outdoor unit and an air conditioner with the air conditioner outdoor unit. The air conditioner outdoor unit comprises a bottom plate, a condenser, an impeller, a compressor assembly and a middle partition plate. The bottom plate is provided with a front panel and a side panel. The condenser, the impeller and the compressor assembly are arranged on the bottom plate. The middle partition plate is arranged on the bottom plate, and a compressor bin and a draught fan bin are limited on the two sides of the middle partition plate correspondingly. The compressor assembly is arranged in the compressor bin, the impeller is arranged in the draught fan bin, and the rest of the space between the compressor bin and the compressor assembly is filled with noisereduction filler. The middle partition plate is connected with the condenser and the front panel. The included angle a 1 between the extending direction of the section, connected with the condenser, of the middle partition plate and the condenser is larger than or equal to 30 degrees. According to the air conditioner outdoor unit, vibration reduction and noise reduction can be effectively achieved.

The invention provides pulping equipment based on multi-vortex impact repulping, which mainly comprises a slurry generating device, a power driving device, auxiliary vortex repulping devices which aremainly vortex making rings, vibration and noise reduction devices which are mainly rubber pads, screwing-up repulping devices which are mainly lower conical cylinders, mutual-flushing repulping devices which are mainly straight cylinders, and screwing-down repulping devices which are mainly upper conical cylinders. The pulping equipment is characterized by multi-area and blind-area-free vortex kinetic energy repulping. Rotary repulping on the outer side of a charging barrel is realized through the auxiliary vortex repulping devices, vibration and noise reduction of the equipment are achievedthrough the vibration and noise reduction devices, vortex kinetic energy repulping of ascending rotational flow is achieved through the screwing-up repulping devices, vortex kinetic energy repulping of descending rotational flow is achieved through the screwing-down repulping devices, and mutual-flushing vortex kinetic energy repulping of double rotational flows is achieved through the mutual-flushing repulping device.

The invention discloses an active pulsation attenuation device, and belongs to the field of vibration damping and noise reduction equipment. By correspondingly arranging a first base body and a secondbase body which are provided with flow channels and corresponding holes and can be hermetically connected with each other and at least one actuating unit which is arranged corresponding to the two base bodies, secondary pulsation can be correspondingly generated in liquid fluid in the flow channels of the two base bodies through control of the actuating unit, and the secondary pulsation and the primary pulsation generated in the liquid fluid transmission process are superposed and offset so as to realize vibration damping and noise reduction in the liquid fluid transmission process. The active pulsation attenuation device is simple in structure, convenient to install and connect, and capable of effectively realizing vibration reduction and noise reduction in the transmission process of the liquid fluid in a pipe and ensuring the accuracy and stability of the liquid fluid transmission; moreover, the controllable states of the active pulsation attenuation device are diversified, the active pulsation attenuation device can be effectively applied to vibration reduction and noise reduction of the liquid fluid in the pipe under different flow states, the application range is wide, the application prospect is good, and the popularization value is high.

The invention discloses a vibration and noise reduction device for a dry type transformer. The vibration and noise reduction device is characterized in that a transformer box is fixedly mounted in a sound insulation box, an upper limit vibration reduction plate is mounted on the upper portion in the transformer box through a left roller and a right roller, a lower limit vibration reduction plate is mounted on the lower portion in the transformer box through a left roller and a right roller, a transformer iron core is fixed on the lower limit vibration reduction plate through a mounting column, a left spring cylinder is fixedly mounted on the left of the upper limit vibration reduction plate, a right spring cylinder is fixedly mounted on the right of the upper limit vibration reduction plate, a left vibration reduction spring is fixedly mounted in the left spring cylinder, a right vibration reduction spring is fixedly mounted in the right spring cylinder, the top end of the left vibration reduction spring and the top end of the right vibration reduction spring are fixedly mounted at the top in the transformer box, a vibration reduction air bag is mounted between the lower limit vibration reduction plate and the bottom of the transformer box, a radiating air cylinder is fixedly mounted on the left lateral wall of the transformer box, and an air inlet radiating cylinder is fixedly mounted on the right lateral wall of the transformer box. The vibration and noise reduction device is scientific and reasonable in design, simple in structure and convenient to operate.