33results about How to "Improve the noise problem" patented technology

The present invention provides a driving circuit and a driving method for light-emitting diodes (LEDs), and a display apparatus using the same. The driving circuit comprises a power switch and a dimmer circuit. The method comprising: detecting a duty of a pulse width modulation (PWM) dimming signal; and when the duty of the PWM dimming signal is less than the predetermined duty, providing an analog dimming signal to the driving circuit. The present invention can be applicable to a display apparatus, and improve a noise problem when a duty of a conventional dimming is too low.

The invention discloses a ship course model predictive control algorithm design method under multiple constraint conditions. The method comprises the following steps of: establishing a ship low-noisemotion control simulation model; designing a course model prediction controller of the ship according to the ship motion control simulation model and establishing a control objective function for themodel prediction controller; determining hard constraint conditions like a rudder angle and a rudder speed of a rudder according to the control objective function and actual operation requirements ofthe ship, and processing the hard constraint conditions; properly broadening the course deviation according to the control objective function to form a soft constraint condition, and processing the soft constraint condition; and according to the control objective function, the hard constraint conditions and the soft constraint condition, performing online optimization to obtain optimal controlleroutput. According to the invention, the noise problem of the rudder device caused by frequent steering in the maneuvering process of the ship is effectively improved, and the stable and low-noise navigation of the ship is ensured.

The invention relates to a low noise stator core lamination and belongs to the field of manufacturing technology of matching parts used by a motor. The low noise stator core lamination is mainly composed of a stator core lamination (3) and a virtual groove which is opened on a pole piece at the bottom of the stator core lamination (3); 1-3 virtual grooves are opened according to the different number of the motor. The lamination has reasonable design and simple structure; the virtual grooves are added on the pole piece of the stator core to lead the frequency of slot ripples to be higher and the amplitude to be lower by taking steps on the inner parts of the motor, thus lowering the noise on the whole, improving the running noise of the motor effectively and improving the product quality.

The invention discloses an air guide assembly and an air supply device. The air guide assembly comprises a plurality of guide vanes, each guide vane is provided with a first end and a second end whichare opposite, each first end is used for being arranged close to an air outlet, each second end is used for being arranged close to the interior of an air outlet duct, and second ends of the at leasttwo guide vanes are not flush with each other, so that the lengths of the parts, extending into the air outlet duct, of the two guide vanes are unequal. Therefore, the plurality of guide vanes are subjected to air cutting and flow guiding in a layered mode, then the air direction is gradually changed through layered air cutting and flow guiding, so that airflow energy losses caused by air cuttingand flow guiding of the plurality of guide vanes can be reduced, the air supply distance and the air supply amount of airflow blown out of the air outlet are guaranteed, and meanwhile, the noise problem can be solved.

The invention discloses a ventilation device and an elevator car provided with the same. The elevator car comprises a car roof, a car bottom, a car wall, a car door and a ventilation device. The ventilation device comprises a ventilation equipment mounting plate, a lower sealing plate, a side sealing plate and ventilation equipment; the ventilation equipment mounting plate, the lower sealing plateand the side sealing plate are connected to form at least two cavities which are different in size and communicate with one another; the ventilation equipment mounting plate and the lower sealing plate are provided with ventilation openings; the ventilation equipment is installed on the ventilation equipment mounting plate, an air outlet of the ventilation equipment is in butt joint with the ventilation opening of the ventilation equipment mounting plate, the ventilation opening of the lower sealing plate is in butt joint with an air inlet of the car roof, and the ventilation opening of the ventilation equipment mounting plate and the ventilation opening of the lower sealing plate are staggered in the height direction and the horizontal direction. When the elevator runs, noise outside theelevator car can be greatly attenuated and running noise of the ventilation equipment and the like are transmitted into the elevator car through the elevator ventilation device, so that the noise problem in the elevator car is remarkably solved, and riding comfort is improved.

The present invention relates to an inorganic-based neutralization-proof, water-proof, and erosion-proof paint composition for a floor finish material, capable of being applied, without a primer, in a wet state with a concrete water content of 100%, and a method for applying a neutralization-proof, water-proof, erosion-proof flooring material, using the composition. The purpose of the present invention is to provide an inorganic-based neutralization-proof, water-proof, and erosion-proof flooring material paint composition and an application method using the same, the composition being applied directly on a concrete structure without a primer, even in a wet state with a water content of 100%, and thus having excellent impact resistance, air permeability, and slip resistance. The method of the present invention comprises a foreign substance removing step for removing foreign substances on a base surface of a concrete structure; a wetting step for creating a wet state by spraying water, 1-2 hours before application of the composition, on the base surface of the concrete structure from which the foreign substances have been removed; and a paint film-forming step for forming a paint film by coating and curing an inorganic-based flooring material paint composition on the base surface of the concrete structure provided in the wet state, wherein the inorganic-based flooring material paint composition comprises, with respect to 100 parts by weight of an aqueous solution phase, 200-300 parts by weight of an inorganic powder, the aqueous solution phase being an acrylic aqueous solution having a solid content of 15-50 wt%, and the inorganic powder comprising, with respect to 100 parts by weight of a binder powder, 45-70 parts by weight of a silica powder, 15-22 parts by weight of an inorganic pigment, 0.5-4 parts by weight of an alumina cement, 0.31-0.5 parts by weight of a polycarboxylate (PC) based dispersant, 0.2-0.4 parts by weight of a powder antifoaming agent, 0.1-0.2 parts by weight of a surface stabilizer, and 0.05-0.1 parts by weight of a bentonite.

An embodiment of the present invention provides a voice synthesis method and device and a device for voice synthesis. The method specifically includes a step of receiving a text to be synthesized, a step of judging a compositing state of the text to be synthesized or the opacity of a frame according to spectrum parameters in the voice synthesis process of the text to be synthesized so as to obtaina corresponding opacity determination result, a step of obtaining synthesized speech corresponding to the text to be synthesized according to the opacity determination result. According to the embodiment of the present invention, the problem of noise occurring in the synthesized speech due to a judgment error of unvoiced and voiced sounds can be solved, and thus the listening feeling and the sound quality of the synthesized voice can be improved.

The invention discloses a blower unit of an air conditioning device for a vehicle. The blower unit compensates and supplements different air resistances between an upper reel housing and a lower reelhousing and can improve air conditioning performance through up-and-down equal pressure adjustment. A blower unit of a vehicle air conditioning device is a blower unit of a double-layer vehicle air conditioning device that separately transmits internal air and external air, and includes: a first spool that is provided with a first blower wheel and in which a first air flow path is formed; and a second reel which is disposed below the first reel, is provided with a second blower wheel, and in which a second air flow path is formed, the diameter of the second blower wheel and the diameter of thefirst blower wheel being different from each other.

The invention discloses a profile sound insulation structure based on particle damping and a design method, and belongs to the field of rail transit, the design method of the profile sound insulation structure based on particle damping comprises the following steps: S10, determining a mounting position area of a particle damping body; s20, the particle damping body is installed in the installation position area of the particle damping body, and the energy consumption condition is counted based on a particle energy dissipation model established through a discrete element method to obtain the optimal vibration reduction effect; s30, parameters of damping particles related to the particle damping body are determined; and S40, verifying a simulation result through an experiment, and determining a final scheme. The sectional material sound insulation structure based on particle damping comprises a sectional material structure and a particle damping body, and the particle damping body is arranged in an installation position area of the sectional material structure. According to the profile sound insulation structure based on particle damping and the design method, the problem of noise generated when a high-speed railway train runs at a high speed is solved.

The embodiment of the invention discloses a medical image visualization method and device, equipment and a computer storage medium. The visualization method of the medical image comprises the following steps: obtaining a first three-dimensional medical image based on acquired medical image volume data; determining a first volume data intensity value of each piece of medical image volume data; based on a preset semi-automatic transfer function and the first volume data intensity value of each piece of medical image volume data, determining a first opacity value corresponding to each piece of medical image volume data, wherein the semi-automatic transfer function represents a mapping relationship between the volume data intensity value and the opacity value; and based on the first opacity value corresponding to each piece of medical image volume data, adjusting the first three-dimensional medical image to obtain a second three-dimensional medical image. According to the embodiment of theinvention, the display effect of the medical image can be improved.

The invention discloses a single-cylinder air-cooled silent unit air flue structure. A bottom is mounted at the top of a bottom frame, an air inlet hole is formed in the left side face of the bottom frame, a left coaming is mounted at the top of the bottom and close to the left side face of the bottom, a right coaming is mounted at the top of the bottom and close to the right side face of the bottom, a middle coaming is mounted at the top of the bottom and positioned between the right coaming and the left coaming, a right partition plate is mounted between the right coaming and the middle coaming, a left partition plate is mounted between the middle coaming and the left coaming, an engine is mounted in the middle coaming, an air outlet channel is mounted in the middle coaming and positioned above the engine, and a silencer is mounted in the left coaming, mounted on the engine and close to the left partition plate. The structure solves the air inlet problem of a single-cylinder air-cooled silent unit, and effectively solves the problem of air inlet noise of the silent unit by the aid of a designed air flue.

The invention relates to the technical field of road construction, and provides an intercepting ditch, a drainage system and a manufacturing method of the intercepting ditch. The intercepting ditch comprises a pipe gallery body with two through ends, and a plurality of drainage ports communicated with the interior of the pipe gallery body are formed in the top end of the pipe gallery body in the length direction of the pipe gallery body at intervals; a plurality of transverse supporting rods are arranged in the top of the pipe gallery body and arranged at intervals in the length direction of the pipe gallery body, and longitudinal supporting rods used for being connected with the transverse supporting rods are arranged in the top of the pipe gallery body; longitudinal supporting rods are also arranged in the bottom of the pipe gallery body, and anchoring rods used for fixing the whole intercepting ditch are further arranged on the pipe gallery bod; and a sealing gasket ring is arranged between any two adjacent pipe gallery bodies, and any two adjacent pipe gallery bodies are connected through a pull rod mechanism. The problem that in the prior art, noise is generated when a vehicle rolls the drainage ditch of the underpass tunnel is solved, and the noise influence of the portal section of the underpass tunnel on nearby residential areas is avoided.

The invention is applicable to the field of road and bridge construction, and provides a crushing and screening device for road and bridge construction. The device comprises a screening box body and a crushing device, a cover plate is arranged on the screening box body, a conveying pipeline is arranged on the cover plate, the screening box body communicates with the crushing device through the conveying pipeline, a plurality of screening boxes, rotating supporting pieces and rod pieces are arranged in the screening box body, a support is arranged on the side, away from the crushing device, of the screening box body, a driving mechanism is arranged on the support, a plurality of first clamping pieces are fixed to the rod pieces in the length direction of the rod pieces, the rotating supporting pieces are rotationally connected to the two sides in the screening box body, and the rotary supporting pieces on the two sides are connected with screening boxes through second clamping pieces. The device has the beneficial effects that the plurality of screening boxes can be driven by the rod pieces to turn over, the screening effect is guaranteed, compared with a conventional vibration mode, the device generates low noise, and due to the fact that the two sides of the screen boxes are clamped to the second clamping pieces, the screen boxes can be taken out rapidly and conveniently.

The invention discloses a seven-forward-gear double-clutch automatic gearbox transmission device. A first-gear driving gear is meshed with a first-gear driven gear; the second-gear driving gear is meshed with the second-gear driven gear; the third-gear driving gear is meshed with the third-gear driven gear; the fourth-gear and sixth-gear driving gear is meshed with the fourth-gear driven gear and the sixth-gear driven gear; the fifth-seventh-gear driving gear is meshed with a fifth-gear driven gear and a seventh-gear driven gear; the reverse gear is meshed with the second-gear driven gear; and the upper output shaft normally engaged gear and the lower output shaft normally engaged gear are engaged with the main reduction gear. The transmission mechanism solves the problem that the cost of a transmission mechanism in two modes cannot be effectively controlled because a traditional DCT gearbox is provided with an independent reverse gear shaft or a reverse gear idle wheel is welded to a gear.

The invention relates to an integrated circuit of a current multiplexing gm-boost low-noise amplifier. The integrated circuit comprises a cascode amplification module, a negative feedback loop module,a direct current isolation module and a cascode amplification module; the cascode amplification module is connected to the negative feedback loop module and the cascode amplification module, and thenegative feedback loop module and the cascode amplification module are connected through the direct current isolation module. The integrated circuit of the current multiplexing gm-boost low-noise amplifier comprises a cascode amplification module, a negative feedback loop module, a direct current isolation module and a cascode amplification module, and can alleviate the noise problem under the condition that the gain is improved.

The invention provides a compressor and an air conditioner including the compressor, and relates to the technical field of refrigerating equipment. The compressor comprises a shell, a crankshaft and arotor. A containing cavity is formed in the shell, and the crankshaft and the rotor are arranged in the containing cavity. The crankshaft comprises a first shaft segment and a second shaft segment, the first shaft segment and the rotor are fixed, and a first magnetic part is arranged on the end face of the second shaft segment. A second magnetic part is arranged at the position, opposite to the first magnetic part, of the inner wall face of the shell. The magnetism of the second magnetic part is opposite to that of the first magnetic part. The crankshaft is sawn through attraction force between the second magnetic part and the first magnetic part, and meanwhile the crankshaft can transmit the attraction force to the rotor; and therefore upward jumping of the crankshaft and the rotor is reduced, the noise problem generated due to the fact that the crankshaft collides with other components of the compressor is solved, stability of the crankshaft is improved, and then operation stabilityof the compressor is improved.

A multiband antenna structure comprises a base portion, one side of the base portion has a first wiring area, the first wiring area has a first metal wiring, a second metal wiring and a connection portion, the first and second metal wirings are arranged in a long-scrolling graph, and two ends of the connection portion are respectively electrically connected with the first and second metal wirings.The multiband antenna structure can achieve integration of the multiband antenna and the circuit to reduce the production cost and achieve the purpose of emitting or receiving multiband signals.

The invention discloses an inductor which comprises a coil and a magnetic core, wherein the coil is accommodated in the magnetic core, one end of the coil is connected with a first terminal, and the other end of the first terminal extends to the outside of the magnetic core and is bent; the other end of the coil is connected with a second terminal, and the other end of the second terminal extendsto the outside of the magnetic core and is bent. An inductor forming method comprises the following steps that S1, a coil and a terminal are welded and put into a mold cavity of a mold, the mold is filled with a powdery magnetic material, and a product consistent with the mold cavity in shape is formed after pressurization; S2, the product is heated and cured; S3, the terminal of the cured productis bent. By means of the technical scheme, the product has the advantage of being low in noise.

Disclosed are a new energy vehicle, and a method and system for improving interior sound quality of a new energy vehicle. The method for improving interior sound quality of a new energy vehicle comprises the following steps: acquiring a noise signal from the interior of a vehicle; performing analysis processing on the noise signal to obtain a frequency and a bandwidth of the noise signal; acquiring, according to the frequency and the bandwidth of the noise signal, a subharmonic signal corresponding to the noise signal; and controlling a vehicle-mounted audio player module to output the subharmonic signal so as to generate a harmonic signal by means of the subharmonic signal and the noise signal. The method for improving interior sound quality of a new energy vehicle can mitigate a noise problem associated with a motor in a new energy vehicle, thereby improving interior sound quality of the new energy vehicle. Moreover, the method can be implemented easily and realized at low costs.

The invention discloses a transverse liquid separation device, a compressor including the transverse liquid separation device and an electric appliance, and relates to the technical field of compressors. The transverse liquid separation device comprises a transverse cylinder body, an air inlet pipe and an air exhaust pipe, wherein the air inlet pipe and the air exhaust pipe communicate with the interior of the cylinder body; a filter net assembly is arranged between the air inlet pipe and the air exhaust pipe, the edge of the filter net assembly is connected with the inner wall of the cylinderbody, and in the air inlet direction, the filter net assembly directly connects with the air outlet of the air inlet pipe. Through arrangement, the filter net assembly directly connects with the airinlet pipe, the filter net assembly has the large circulation area for the refrigerant, the refrigerant circulation resistance is reduced, through reduction of the refrigeration circulation resistance, the pressure pulsation in the periodic air suction and exhaust process of the compressor can be reduced, and meanwhile, noise of the separation device and the compressor can be reduced.

The invention, belonging to radio frequency communication technical field, provides an integrated RF GPS active antenna, aiming at solving the problems that the GPS receivers of current active antennas are difficult to miniaturize, the modules are complex in connection and low in receiving sensitivity, which influences initial positioning time and positioning precision. The technical proposal of the invention adopts an integrated RF GPS active antenna; a GPS active antenna is optimized, and impedances are matched between the component parts, interconnected losses are reduced; total noise index is reduced and the receiving sensitivity of the GPS positioning device is improved, thus the initial positioning time and precision of the GPS positioning device are remarkably improved. The integrated RF GPS active antenna is easy to be miniaturized and is particularly suitable to be integrated with the functional module of mobile communication equipment such as mobile phone and PDA.

The invention relates to an integrated circuit of a current multiplexing gm-boost low-noise amplifier. The integrated circuit comprises a common-source amplification module, a negative feedback loop module, a direct current isolation module and a common-gate amplification module. The common-source amplification module is connected to the negative feedback loop module and the common-gate amplification module, and the negative feedback loop module and the common-gate amplification module are connected through the direct current isolation module. The integrated circuit of the current multiplexinggm-boost low-noise amplifier comprises the common-source amplification module, the negative feedback loop module, the direct current isolation module and the common-gate amplification module, and thenoise problem can be solved under the condition that gain improvement is guaranteed.

The invention discloses a low-noise automobile steering gear in the field of steering gear technology, which takes into account the driver's experience and handling performance, meets the requirements of multiple working conditions for automobile steering, takes into account both the driver's experience and the handling performance of the automobile, and reduces the noise in the steering process of the automobile. vibration and noise. Including the steering gear housing, the steering gear and the steering rack are installed in the steering gear housing, and the meshing teeth on the steering rack have a variety of different pitches; when the car turns to both sides, The tooth pitch distribution of the meshing teeth of the steering rack meshing with the steering gear in turn is asymmetrical; the steering rack is disconnected in the non-meshing area and connected by a rubber composite connector; the steering gear housing is equipped with a rubber composite pressure block The rubber composite pressing block is slidingly connected to the steering rack, and the rubber composite pressing block and the steering gear are respectively located on two sides of the steering rack and opposite to each other.

The invention provides a dust collecting combination cabinet. The combination cabinet comprises a cabinet body and a dedusting module, wherein the cabinet body is used for placing mechanic equipment, and the dedusting module is arranged in the cabinet body and used for conducting dust collecting treatment on dust which is produced by the mechanic equipment during working. The dedusting module comprises a funnel solder mask part and a sand-blasting cabinet draught fan unit, wherein the funnel solder mask part is fixedly arranged inside the cabinet body, and the lower portion of the funnel solder mask part is sleeved with a dust collecting bag; the sand-blasting cabinet draught fan is arranged on the lower portion of the funnel solder mask part and used for sucking dust on the upper portion of the funnel solder mask part into the dust collecting bag. The mechanic equipment is placed on the funnel solder mask part. According to the dust collecting combination cabinet, the strength of dust absorbing is high; meanwhile, the mechanic equipment is stored in the dust collecting combination cabinet body, so that the noise problem is also solved greatly; in addition, the design of the cabinet body enables the cabinet body to have high-strength sealing performance, and accordingly the purposes of water resistance, dust resistance and corrosion resistance are achieved.