18results about How to "Noise control" patented technology

The invention provides an all-digital beamforming transmitter and an all-digital beamforming transmitting method based on a digital radio frequency technology. The all-digital beam forming transmitter provided by the invention comprises a plurality of baseband signal generators, a quadrature modulator, an adder, a 1-bit increment integral modulator, a digital-to-analog converter, a radio frequency front end and an antenna which are connected in sequence, each baseband signal generator is connected with one path of quadrature modulator and one antenna, one path of quadrature modulator comprises a plurality of quadrature modulators, and each baseband signal generator generates a pair of baseband signals; the number of the quadrature modulators in the one-path quadrature modulator is the same as the number of the adders, the number of the 1-bit incremental integral modulators, the number of the digital-to-analog converters, the number of the radio frequency front ends and the number of the antennas; the number of the baseband signal generators is the same as the number of wave beams formed by the antenna, and the number of the baseband signal generators is different from the number of the quadrature modulators in one path of quadrature modulator.

The utility model discloses a guide rail structure for window glass, which relates to the technical field of automobiles and comprises an external c-shaped fixed sliding seat, a sliding unit and a sealing sliding unit. The upper end of the inner side of the external c-shaped fixed sliding seat is fixedly connected with a rectangular mounting plate, and the external c-shaped fixed sliding seat is a curved sliding seat with a certain radian; the sliding unit comprises a first sliding groove, an inner side rolling limiting groove, a sliding mounting seat and a spherical rolling bead, the first sliding groove is fixedly connected to the rear end of the upper side of the rectangular mounting plate, and the inner side rolling limiting groove is fixedly connected to the lower end of the inner side of the first sliding groove. The car window glass is connected with the guide rail through the sliding block, collision is reduced through the elastic buffering structure, and noise generated by sliding and noise transmitted into a compartment from the outside are reduced through the elastic buffering structure and the sealing noise reduction structure.

The utility model discloses a test bench for testing an electro-hydraulic power-assisted steering gear. The test bench comprises an input end driving and measuring system, an output end loading and measuring system, an oil supply and power system and an electrical and control system. The input end driving and measuring system comprises a servo motor, a first angle gauge, a torque sensor and a universal joint which are connected in sequence; the universal joint is connected with an input shaft of the electro-hydraulic steering gear through the input clamp; the output end loading and measuring system comprises a torque sensor, a bearing seat and a loading shaft which are connected in sequence; the loading shaft is connected with an output shaft of the electro-hydraulic steering gear; a loading swing arm is fixed on the bearing seat, and a force arm of the loading swing arm is sequentially connected with a connection adjusting mechanism and a servo oil cylinder; the oil supply and power system comprises an oil supply pump station and a power pump; the oil supply pump station provides an oil source for the electro-hydraulic steering gear; the power pump provides oil pressure power for the servo oil cylinder; and the electrical and control system is electrically connected with the input end driving and measuring system, the output end loading and measuring system and the oil supply and power system respectively.

The utility model provides an aluminum carbide wood composite board convenient to assemble, belongs to the field of composite boards, and aims to solve the problem of inconvenience in strengthening fire prevention and moisture resistance. The aluminum carbide wood composite board comprises an aluminum carbide wood composite board body, a moisture-proof layer is fixedly connected in the aluminum carbide wood composite board body, and a through groove is formed in the aluminum carbide wood composite board body; a clamping groove is formed in the carbonized aluminum wood composite board, a mounting plate is arranged in the through groove, a spring is fixedly connected into the mounting plate, a limiting plate is fixedly connected to the spring, and a check block is fixedly connected to the limiting plate. When the aluminum carbide wood composite board is used, the reinforcing effect can be achieved through the honeycomb-shaped aluminum honeycomb layer, the use strength can be improved, the aluminum honeycomb layer is filled with the fireproof filling particles, the fireproof layer is matched, the fireproof effect of the aluminum carbide wood composite board can be improved, the damp-proof layer is arranged in the aluminum honeycomb layer, the situation that the protection effect is affected by damp is reduced, and the service life of the aluminum carbide wood composite board is prolonged. And the installed sound insulation layer can control generation of noise, and the using effect is improved.

The utility model relates to hidden rail adjusting screw automatic feeding technology field, more specifically, it relates to a screw automatic sequencing feeding device, including frame, storehouse, belt material spare, sweep material spare, push material spare, unloading slide, storehouse assembly is in the frame and is used to place screw, and the belt material spare is located in the storehouse and moves along the vertical of storehouse to and fro, the top wall of belt material spare is equipped with the clamping groove, the clamping groove is used to place the stem of screw, and the sweep material spare is located on the storehouse and moves along the transverse of storehouse to and fro, and the push material spare is set up in the longitudinal both sides of storehouse with unloading slide, and in the vertical of storehouse all are located between sweep material spare and belt material spare, when the belt material spare rises to the preset height, the sweep material spare transverse movement is used for sweeping back the screw of belt material spare on the reverse state to the storehouse, and the push material spare is used for pushing the screw of belt material spare on the front state and moves to unloading slide, the utility model discloses a screw automatic sequencing feeding device has the effect of reducing processing noise, reduces equipment cost.

The present application relates to magnetic power brake structure and load release device, including piston cylinder; air pressure release structure; magnetic transmission device, which is driven by high pressure gas and moves along the side wall of the piston cylinder, which structure includes the outer magnetic ring group and the inner magnetic ring group with magnetism; brake conductor ring, which is a magnetic conductive structure and is sleeved on the piston cylinder. The present application has compact and reasonable structure, and is convenient to operate. By using high pressure gas as power source, the inner magnetic ring group is driven to work, and the outer magnetic ring group is driven to move in the same direction, so that the purpose of releasing load is achieved by using magnetic force transmission principle. Meanwhile, by designing parameters such as release device exhaust parameter, inner and outer magnetic ring parameter and brake conductor ring parameter, the load release process speed, overload and noise can be effectively controlled. The side pulling type single-stage piston cylinder underwater load release device designed by the present application adopts twice air intake mode, which can greatly release the energy distribution of the process, and significantly reduce the release overload and flow noise.

The present disclosure relates to the technical field of air conditioners, and in particular to an air conditioner outdoor unit and an air conditioner having same. The present disclosure provides an air conditioner outdoor unit. The air conditioner outdoor unit comprises: a case, an air outlet being formed at the top of the case, and a compressor assembly being provided at the bottom of the case; a fan provided at the top of the case and located at the position of the air outlet; and an electric control box provided in the case, wherein the distance between the bottom of the electric control box and the bottom of the case is Z2, and Z2≥0.8×H, wherein H is the height of the compressor assembly. According to the air conditioner outdoor unit of the present disclosure, on the premise of ensuring normal operation and convenient maintenance of the air conditioner outdoor unit, by reasonably configuring the distance between the electric control box and the bottom of the case, the height direction of the electric control box can be flexibly adjusted, thereby reducing effects of the electric control box on ventilation and noise in the air conditioner outdoor unit.

The invention discloses a washing equipment motor and washing equipment, the washing equipment motor comprises a rotor and a stator which sleeves the rotor and is coaxial with the rotor, the washing equipment motor also comprises a noise reduction assembly, the noise reduction assembly comprises a cylinder sleeve which sleeves between the stator and the rotor and extends from one end to the other end along the axial direction of the rotor, and the noise reduction assembly is used for isolating the rotor from the stator. When the rotor rotates, air in a gap between the rotor and the stator can be driven to flow to form airflow, and the airflow is influenced by concave-convex change of the inner peripheral side wall of the stator to generate vibration noise when flowing through the inner peripheral side wall of the stator, so that after the rotor and the stator are isolated by the cylinder sleeve arranged between the stator and the rotor, the airflow is blocked by the cylinder sleeve when the rotor rotates; according to the air compressor, air cannot flow to the inner circumferential side wall of the stator and only can flow in the gap between the cylinder sleeve and the rotor, air between the stator and the cylinder sleeve is isolated by the cylinder sleeve and cannot be driven by the rotor to form airflow, noise generated by airflow vibration is avoided, and the user experience is effectively improved.

The invention discloses a four-pipe air-cooled screw unit, and belongs to the technical field of refrigeration equipment.The four-pipe air-cooled screw unit comprises a unit shell and a vertical frame, the vertical frame is arranged on one side of the unit shell, and a plurality of ventilation openings are formed in the top of the unit shell; each ventilation opening is sleeved with an adjusting device used for adjusting the air flow path, an electric push rod is installed on the top wall of the vertical frame, the two output ends of the double-shaft motor are fixedly connected with rotating gears correspondingly, and the two rotating gears are engaged with two moving racks correspondingly. The end, facing the ventilation opening, of the moving rack is provided with a control mechanism used for adjusting airflow paths. By arranging the adjusting device outside the ventilation opening, a worker can control the size of the airflow path of the ventilation opening, so that the airflow path is adjusted according to different operation states of the unit, and the airflow paths of different parts of the unit can be separately controlled by adjusting the control mechanism.

The utility model relates to the technical field of speed reducing mechanisms, in particular to a speed reducer integrated with a centrifugal braking function, a linear driving device and lifting equipment. The protective cover is connected to the shell; the connecting shaft is coaxially connected with the rotating shaft of the speed reducing assembly; the balancing weight is in sliding connection with the connecting shaft in the radial direction of the connecting shaft, the balancing weight is located in the protective cover, the balancing weight is connected to a spring used for resetting the balancing weight, and the side wall, away from the connecting shaft, of the balancing weight is matched with the inner side wall of the protective cover; the linear driving device comprises an output mechanism, a motor and the speed reducer integrated with the centrifugal braking function, and the speed reducer integrated with the centrifugal braking function is connected between the motor and the output mechanism. And the lifting equipment takes the linear driving device as a driving source. The speed reduction assembly and the centrifugal brake are integrated into a whole through the flange, centrifugal force is generated through the balancing weight when motor braking fails, and braking is achieved through friction force between the balancing weight and the protective cover.

The invention provides a noise reduction partition wall for a rail locomotive, the noise reduction partition wall comprises a bottom plate, a panel and a honeycomb interlayer arranged between the bottom plate and the panel, the honeycomb interlayer comprises a plurality of honeycomb noise reduction units, each honeycomb noise reduction unit comprises an interlayer pipe, a first horn structure arranged at the first end of the interlayer pipe and a second horn structure arranged at the second end of the interlayer pipe, the first horn structure extends from the first end in the axial direction of the interlayer pipe, and the first horn structure is provided with a first opening; the orthographic projection of the first end on the bottom plate is within the orthographic projection of the first opening on the bottom plate, the second horn structure extends from the second end in the axial direction of the interlayer pipe, the second horn structure is provided with a second opening, and the orthographic projection of the second end on the bottom plate is within the orthographic projection of the second opening on the bottom plate; holes are formed in the surface of each honeycomb noise reduction unit, and the diameter of each hole is smaller than 10 mm.

The utility model provides a mounting bracket which is used for being fixed on an A-pillar inner plate and mounting an instrument board stiffening beam, the A-pillar inner plate comprises a first limiting surface and a second limiting surface, and the first limiting surface and the second limiting surface intersect to form an angular space; the mounting bracket comprises a supporting plate, two sides of the supporting plate are respectively provided with a first connecting part and a second connecting part, and the first connecting part and the second connecting part are respectively provided with a cavity; wherein the first connecting part and the first limiting surface are fixed in an abutting mode in the X direction, the first connecting part and the second limiting surface are fixed in an abutting mode in the Y direction, and the second connecting part is used for installing the instrument board stiffening beam. The mounting bracket provided by the utility model can improve the strength, rigidity and modal performance of the mounting structure of the instrument board stiffening beam assembly, reduce vibration noise generated by road excitation in the running process of a vehicle, improve the safety performance of front collision and side collision of the vehicle, and improve the quality control of the vehicle.

The invention discloses a marine paint spraying pump noise reduction and silencing device which comprises a connecting port (1), a shell shield (2), noise reduction filter cotton (3), a shell end cover (4), a shell shield sealing plate (5), a spiral noise reduction shaft (6), a second-stage noise reduction and silencing cavity pore plate (7), a first-stage noise reduction and silencing cavity end cover (8) and a first-stage noise reduction and silencing cavity pore plate (9). The connecting interface (1) is fixedly connected with the shell shield sealing plate (5), the shell shield (2) and the secondary noise reduction cavity pore plate (7), the shell end cover (4) is in threaded connection with the shell shield (2), and the primary noise reduction cavity end cover (8) is in threaded connection with the connecting interface (1). According to the noise reduction and silencing device, it is ensured that noise generated in the paint construction operation process is effectively controlled, the problem that noise generated during paint spraying operation of a paint pump in the related industry affects the life of residents and harms the health of constructors is solved, and the requirement for green and environment-friendly production is met.

The application provides a kind of RAG knowledge base retrieval threshold self-adapting dynamic optimization method and system thereof, comprising reading system basic configuration parameter, and based on parameter dynamic calculation maximum shard containing number;Load test question set, execute threshold step scanning to generate candidate threshold;For each candidate threshold, retrieve test question, record the original data of retrieval result under each candidate threshold;Statistical analysis is carried out on the retrieval result, and effective coverage rate and average result number are calculated;Apply constraint-based nonlinear scoring algorithm, combine effective coverage rate and average result number, and introduce load adaptability as penalty boundary, calculate the comprehensive score of each candidate threshold;According to the comprehensive score result, output the threshold with the highest score as the recommended parameter, and generate an analysis report containing the recommended reason.The application effectively controls the context noise and Token cost input to the large model while ensuring the retrieval recall rate, and realizes the automatic performance optimization of RAG system.

The utility model belongs to the field of damping rubber blocks, particularly relates to a damping rubber block with a double-damping structure, and aims to solve the problems that when an outdoor unit of an existing air conditioner is mounted, a plurality of damping rubber blocks are generally required to be placed at the bottom of a mounting frame for sound insulation and vibration reduction, the influence on a mounting surface caused by overlarge vibration is avoided, but the single-layer damping effect is poor. In order to solve the problems that in the prior art, a damping rubber block is arranged on an air conditioner outdoor unit, and the air conditioner outdoor unit is installed unevenly when an uneven installation face is met, the damping rubber block comprises a damping rubber block body, a first connecting block is fixedly connected to the top of the damping rubber block body, and a threaded rod is fixedly connected to the top of the first connecting block. The damping bolt and the damping rubber block body are subjected to double-layer vibration reduction, the vibration reduction effect is enhanced, the damping bolt and the gasket are made of silicon rubber materials, vibration and noise can be effectively controlled, abrasion of screws at the lap joint position is reduced, the service life of a product is prolonged, meanwhile, the silicon rubber can keep the damping performance in the high-temperature environment, and the service life of the product is prolonged. And failure caused by temperature change is avoided.

The invention discloses a gain determination method and unit and an FFT circuit, the gain determination method is used for determining the gain of each stage of input data in the FFT operation circuit during butterfly operation so as to reduce the butterfly operation result according to the gain, and the method comprises the following steps: obtaining the group power of each group of input data in each stage of butterfly operation according to the first stage of input data, determining the maximum group power of the jth-stage butterfly operation as the stage power of the jth stage; determining the gain of the jth stage according to the stage power of the jth stage and a preset gain determination formula; the gain determination formula is used for identifying whether each group of input data in the jth-level input data has an overflow risk or not after the butterfly operation is carried out on each group of input data. The frequency of signal attenuation in the calculation process can be reduced as much as possible under the condition that no overflow risk exists in butterfly calculation, the calculation precision of FFT is improved, and then the signal-to-noise ratio of an output frequency spectrum is remarkably improved.

The utility model discloses a kind of all-terrain skin side bicycle outer tire tread structure and bicycle outer tire, belong to tire technical field, its structure includes shoulder and crown, wherein: the two sides of the crown are connected shoulder. Anti-skid pattern piece one, anti-skid pattern piece two and anti-skid pattern piece three are equipped on the shoulder. First pattern piece, second pattern piece, third pattern piece, fourth pattern piece, fifth pattern piece are equipped on the crown, and according to square diagonal cutting configuration transverse, longitudinal repetition, regular arrangement. The utility model adopts "Mediterranean" pattern design, and the tread pattern piece is relatively shallow rolling belt, and is matched with serrated transverse, longitudinal pattern groove, improves the grip when turning under the premise of not obvious increase rolling resistance;Shoulder area uses anti-skid granule pattern piece, suppresses water film effect when overbending, maintains lateral grip;Adopt composite pattern system, by local fine pattern, better realize the performance balance of all-terrain rolling resistance and wet road grip;Tread relatively shallow three-dimensional pattern piece staggered arrangement, avoid air turbulence, reduce the noise generated by tread pattern piece and road impact, effectively control noise spectrum;Tread pattern groove is formed air convection by longitudinal and transverse intersection, reduce tire temperature rise when high-speed riding, greatly prolong tire service life.

The utility model relates to the technical field of charging piles, and discloses an ultra-silence type charging pile which comprises a box body, the front end of the box body is rotatably connected with a cabinet door, the front end of the cabinet door is provided with an observation window, the right end of the box body is fixedly connected with an air exhaust and noise reduction assembly, the left side and the right side of the box body are fixedly connected with charging wires, and the left side and the right side of the box body are fixedly connected with charging wires. One end of the charging wire is fixedly connected with a charging wire, the other end of the charging wire is fixedly connected with a plug, the left end of the box body is detachably connected with an air inlet silencing cover, the outside of the air inlet silencing cover is fixedly connected with an air inlet pipe, the left end of the box body is fixedly connected with an air exhaust silencer, and the bottom of the air exhaust silencer is fixedly connected with sound insulation cotton. According to the utility model, the noise generated during the operation of the charging pile is effectively controlled, so that the charging process is quiet, the user experience is improved, the influence on the life or work of surrounding people is avoided, and the comfort level of people is improved.