194results about How to "Play the role of noise reduction" patented technology

The invention relates to direction of arrival estimation for source signals, provides an algorithm for DOA (Direction of Arrival) estimation under a mutual coupling condition of unknown array elements. Under the premise of a sparse reconstruction theory, the algorithm makes full use of all information received by an array, and the angle estimation precision can be improved under strong mutual coupling of the array. The technical scheme adopted by the invention is that the method for sparse DOA estimation under mutual coupling of array elements comprises the steps of 1, calculating a covariance matrix R for a received signal X^(t); 2, performing singular value decomposition on the covariance matrix R; 3, calculating a signal subspace RS for receiving data according to a signal unitary space; 4, building a sparse signal complete dictionary AJ according to parameterization J of a steering vector; 5, building a convex programming function for sparse signal reconstruction according to a norm l1; 6, solving the convex programming function and performing spectrum peak search; and 7, further improving the estimation precision by using a principle of grid refinement. The method is mainly applied to direction of arrival estimation for signals.

The invention relates to a multistage crusher for mining use. The multistage crusher comprises a shell, a feed hopper, an outlet hopper and a rack. The feed hopper is arranged at the upper end of the shell. The outlet hopper and the rack are disposed at the lower end of the shell. A first coarse crushing roll and a second coarse crushing roll which are parallel to each other are arranged inside the shell. Several coarse crushing teeth which are engaged with each other are arranged on the periphery of the first and second coarse crushing rolls. A first fine crushing roll and a second fine crushing roll which are parallel to each other are arranged below the first coarse crushing roll and the second coarse crushing roll inside the shell. Several fine crushing teeth which are engaged with each other are arranged on the periphery of the first fine crushing roll and the second crushing roll. In addition, teeth number of the fine crushing teeth is greater than teeth number of the coarse crushing teeth. A partition plate is arranged inside the shell, and a ventilation channel is formed between the partition plate and a sidewall of the shell. The outside of the shell is provided with an exhaust fan which matches the ventilation channel. Besides, an output end of the exhaust fan is connected to a dedusting box through a pipeline.

The invention relates to the field of dishwashers, in particular to a dishwasher condensation drying system, a condensation drying method and a dishwasher. The dishwasher has an inner container enclosing a washing chamber. The condensation drying system comprises an air exhaust device and a collection chamber used for collecting air in the washing chamber. The collection chamber is provided with an air outlet, the air exhaust device comprises a housing and a fan arranged in the housing, one end of the shell is communicated with atmospheric air and the other end is communicated with a condensation chamber. An air outlet of the collection chamber is communicated with the housing, and the fan is arranged at one end of the housing distant from the condensation chamber and the air outlet. An openable air separator is arranged in the air outlet. When the air separator is opened, the collection chamber is communicated with the housing, and the fan can guide external air and humid air in the washing chamber into the condensation chamber. Cold drying air outside and hot humid air can enter the condensation chamber to significantly improve drying and condensation efficiency. In addition, humid air has no need to pass the fan and thereby has no damage to the electric control system of the fan.

The invention provides a self-cleaning negative pressure blower which comprises a first cylindrical shell, a first cleaning assembly, a first filter screen, a suction assembly, a second filter screen, a second cleaning assembly and a dirt collecting assembly, wherein a first end of the first cylindrical shell along the axial direction is provided with an indoor port, and a second end is an outdoor port; the first cleaning assembly, first filter screen, suction assembly, second filter screen and second cleaning assembly are respectively arranged in the cavity of the first cylindrical shell, and are sequentially arranged along the first cylindrical shell from the first end to the second end; the dirt collecting assembly comprises a drainage pipe and a collecting bag; a first end of the drainage pipe is provided with a first branch pipe and a second branch pipe; the first branch pipe and second branch pipe are respectively communicated with the inner cavity of the first cylindrical shell; and a second end of the drainage pipe is connected with the collecting bag. The self-cleaning negative pressure blower is simple and practical, can implement self-cleaning, and saves time and labor.

The invention provides a device with a feeding function. The device includes a feed cylinder, a rotation bin, and an ejection cylinder; the feed cylinder is provided with a discharge opening, and delivery feed is placed in the feed cylinder; the rotation bin is connected with the discharge opening, a bin opening is formed in the rotation bin and rotates along with the rotation bin, so that the rotation bin has a feed receiving state and a feed falling state, wherein in the feed receiving state, the rotation bin receives the delivery feed falling from the discharge opening, and in the feed falling state, a certain amount of the delivery feed in the rotation bin is released; a receiving opening communicated with the rotation bin is shaped and formed in the ejection cylinder, and the ejection cylinder is used for ejecting the delivery feed which falls into the ejection cylinder to the outer side of the ejection cylinder. By the adoption of the device with the feeding function, a user can remotely send a control command to achieve the pet feeding function and control the feeding amount for pets, and the safety and rationality of per feeding are ensured.

The invention discloses a polishing device for an aluminium alloy door and window support notch, and relates to the technical field of aluminium profile machining. The polishing device comprises a working table, a clamping plate is fixedly connected to the middle portion of the upper surface of the working table, an object containing hole is formed in the top of the side face of the clamping plate, an elastic mat is fixedly connected to the lower surface of the inner wall of the object containing hole, and the upper surface of the elastic mat and the lower surface of an aluminium plate are inlap joint. According to the polishing device for the aluminium alloy door and window support notch, when polishing discs are in contact with the notch of the aluminium plate, polishing work can be done on the notch, a large quantity of flying chippings can be generated in the polishing process of the polishing discs, the flying chippings are limited into a protection cover under the effect of theprotection cover and then flows out through a drain outlet, the condition that the flying chippings hurt people can be effectively reduced, the two polishing discs can polish the two side faces of thealuminium plate at the same time, and therefore the working efficiency of a worker can be improved.

The invention discloses a heterogeneous federated learning mine electromagnetic radiation intensity trend tracking method based on an SVD algorithm, and the method comprises: firstly proposing a heterogeneous model federated learning algorithm for the problem of data imbalance in a federated learning client, and setting a heterogeneous central model in a server for the client to select, so as to improve the precision of a local model; aiming at the problem of uploading communication cost of local model parameters, providing an efficient communication algorithm that an SVD algorithm is firstlyused for decomposing a parameter matrix to obtain a corresponding singular value matrix, and then the singular value matrix is uploaded to a central server for aggregation updating; and finally, usingthe updated local model by each client to extract local data features, and using the features and real data values by each client to train the ESN and then to execute trend tracking. According to theinvention, trend tracking of electromagnetic radiation intensity acquired by multiple sensors can be realized on the premise of protecting data privacy, the trend tracking precision of each client can be improved, and the communication cost required by a framework is reduced.

The invention discloses an axial flow fan ternary impeller with a vein-shaped structure and a nonuniform empennage. The axial flow fan ternary impeller comprises a hub, and a connecting piece for a shaft sleeve fixed on the hub. The axial flow fan ternary impeller further comprises twisted blades and splitter blades fixedly connected to the hub; the twisted blades include suction surfaces and pressure surfaces; wing-shaped grooves are formed in the tops of the twisted blades; vein-shaped grooves are formed in the upper half parts of the pressure surfaces of the twisted blades; the wing-shaped grooves are communicated with the vein-shaped grooves through exhaust ports; winglet projections and dense winglets are arranged at the tail parts of the suction furnaces of the twisted blades; the dense winglets are arranged on two sides of the winglet projections; parabola small holes are formed in the twisted blades; the splitter blades are arranged between two adjacent twisted blades; and the heights of the splitter blades are smaller than the heights of the twisted blades by one half.

The invention relates to the field of medical instruments, and specifically relates to an air channel control device of breathing machine; the air channel control device of breathing machine comprises a first input end, a first filter, a first noise reducer, a turbine, a changeover valve, a first flux sensor, a second noise reducer, a first check valve and a first output end which are sequentially connected; the air channel control device of breathing machine further comprises a bypass pipe, an exhalation valve and a three-way electromagnetic valve; one end of the bypass pipe is connected with the changeover valve; the other end of the bypass pipe is connected with the first filter; one ends of the changeover valve and the exhalation valve are connected with the first check valve and the first output end; the other end of the exhalation valve is connected with an air inlet end of the three-way electromagnetic valve; an air outlet end of the three-way electromagnetic valve is connected with the first flux sensor and the second noise reducer. The air channel control device of breathing machine takes effect of reducing the noise by the noise reducers in front of and behind the turbine, makes the air flow more stable, makes the control easy and convenient, increases the precision of the system, ensures the comfort of the patient, and provides convenience for user experience.

The invention discloses a sound absorption superstructure. The sound absorption superstructure comprises a regular hexagon air domain 5, six regular hexagon single cells (6, 7, 8, 9, 10 and 11) at the first layer of the periphery of the regular hexagon air domain 5, and twelve incomplete regular hexagon single cells (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 and 23) at the second layer of the periphery of the regular hexagon air domain 5. All single-cell Helmholtz resonant cavities communicate with an external sound field 4 through resonant short tubes. According to the invention, the sound absorption superstructure has single-pole resonance and bipolar resonance phenomena at a low frequency, single-pole resonance can generate a negative dynamic volume modulus, yet bipolar resonance can generate negative dynamic quality density. Due to the negative dynamic volume modulus and the negative dynamic quality density, sound energy is aggregated in the sound absorption superstructure, and thus sound waves are prevented from continuously spreading forward. Therefore, the sound absorption superstructure forms a wide band gap between a single-pole resonance frequency and a bipolar resonance frequency and prevents propagation of the sound waves through a resonant sound absorption mode.

The invention relates to a blade front edge misplaced impeller. First, suppose the number of the blades of the fan impeller to be even, and then mount the blades equidistantly around the circumference on the hub of the axial-flow fan or on the wheel disk of the centrifugal fan. The front edges of odd and even series blades are misplaced. If the distance between the front edge of the two series blades satisfies the condition of making the phase of two sound waves reverse or differ by half a wavelength, two sound waves with the same frequency and amplitude and reversal phases are constructed.

The invention discloses a computer case with a shock-proof function. The computer case comprises a rack, wherein side plates are fixedly arranged on the side surfaces of the rack; the upper part of the inner side of each side plate is fixedly provided with a power supply shock-proof pad; a cooling hole plate is arranged below each power supply shock-proof pad; the lower part of the rack is movably provided with a U-shaped sleeve; the outer surface of the bottom of the rack and the inner surface of the bottom of the U-shaped sleeve are connected by at least one group of parallel elastic components and damping components; the top cover of the rack is also provided with a dust-proof net; a cooling fan is arranged below the dust-proof net in the rack. The computer case with the shock-proof function has the advantages of simple structure and good shock-proof function. The junction of the outer surface of the bottom of the rack and the inner surface of the bottom of the U-shaped sleeve is provided with at least one group of parallel elastic components and damping components, so inner electronic components are effectively prevented from damage when the case shocks, and an effect on dust prevention can be effectively achieved in a manner that the top cover and the bottom plate of the rack are respectively provided with the dust-proof net.

The present application discloses an electronic assembly and glasses. The electronic assembly comprises an accommodating body, a cover body, a first circuit board and a second circuit board; an open cavity is defined in the accommodating body; the opening of the cavity is covered with the cover body; the first circuit board is disposed in the cavity in a manner that the first circuit board is parallel to the opening plane of the opening; the surface of one side of the first circuit board is provided with a first microphone component, wherein the one side of the first circuit board faces the cover body; the second circuit board is arranged in the cavity in a manner that the second circuit board is perpendicular to the first circuit board; the surface of one side of the second circuit boardis provided with a second microphone component, wherein the one side of the second circuit board faces the side wall of the accommodating body; a hole sound guiding hole and a second sound guiding hole are formed in the side walls of the cover body and the accommodating body respectively; the first microphone component is used for receiving sound inputted through the first sound guiding hole; andthe second microphone component is used for receiving sound inputted through the second sound guiding hole. With the above technical schemes of the invention adopted, the space of the electronic assembly can be fully utilized. When the electronic assembly is applied to an electronic device, the lightening and thining of the electronic device can be benefitted.

The invention provides a micro camera well drill. The micro camera well drill comprises a left base, a right base and a bottom base station which is arranged below the left base and the right base and connected with the lower end surface of the left base and the lower end surface of the right base in a sliding mode; an extensible spring is connected between the left base and the right base; the outer side end surface of the right base is provided with a right fixing table rotating shaft; the outer side end surface of the left base is provided with a left fixing table rotating shaft; the right fixing table rotating shaft is connected with a right fixing table through a rotating shaft support and the left fixing table rotating shaft is connected with a left fixing table through a rotating shaft support; the bottom of the right base is provided with a right fixing device extensible motor and a right bottom wheel.

The invention discloses an automobile B-column capable of realizing multi-axis concentrated energy absorption. The automobile B-column comprises a B-column outer plate, a micro-cell filling layer, anda B-column inner plate. The micro-cell filling layer is a stereoscopic structure formed by successively arranging and combining multiple cell bodies in an X direction and a Y direction. The cell bodyis formed by connecting two symmetrical sub-cells. The sub-cell comprises a force transmitting part, a first vertical energy absorption part, a second vertical energy absorption part, a first horizontal energy absorption part, and a second horizontal energy absorption part. One end of the force transmitting part is connected with the first vertical energy absorption part through a first horizontal force transmitting plate, and the other end is connected with the first horizontal energy absorption part. The first vertical energy absorption part is connected with the second vertical energy absorption part. An included angle between the first vertical energy absorption part and the second vertical energy absorption part is 135-165 degrees. The first horizontal energy absorption part is connected with the second horizontal energy absorption part through a second horizontal force transmitting plate. The other end of the second horizontal energy absorption part is connected with the secondvertical energy absorption part. The automobile B-column is low in initial peak value during a collision process, stable in energy absorption process, and good in energy absorption effect.

The invention discloses a curtain wall board of a suspension type curtain wall, and the curtain wall board comprises a curtain wall board body, wherein the upper part of the curtain wall board body is provided with an upper hook part capable of being suspended on a cross keel of the curtain wall, and the lower part of the curtain wall board is provided with a lower hook part capable of being suspended on the cross keel of the curtain wall. The curtain wall board of the suspension type curtain wall has the advantages of simple structure, firmness and simpleness in connection and high installation efficiency.

The invention discloses an air conditioning air deflector and a manufacturing method of the same. The air conditioning air deflector comprises an arc metal material lining, at least one layer of sound-insulation wind deflector outer layer is arranged on the outer surface of the metal material lining, a fastening component connected with the upper end of the sound-insulation air deflector outer layer is arranged at the upper edge of the inner surface of the metal material lining, a connecting component connected with the lower end of the sound-insulation air deflector outer layer is arranged at the lower edge of the inner surface of the metal material lining, and a middle connecting piece is arranged in the middle of the inner surface of the metal material lining. The sound-insulation air deflector outer layers are arranged on the surface of the metal material lining, so that when an air conditioner is started, sound reduction, sound attenuation and noise reduction functions are achieved; by the additional arrangement of the sound-insulation air deflector outer layers, connecting clearances of air deflectors and air conditioning parts are greatly reduced, and water drops generated under the action of heat conduction are reduced; the sound-insulation air deflector outer layers are tightly connected with the metal material lining, so that convenience in assembly is achieved, production cost is greatly lowered.

The invention discloses a new type of metal processing drilling machine, comprising: a processing table, a slide bar, a support frame, a drill mechanism and a sound insulation cover; the slide bar is vertically fixed on the processing table, and the drill mechanism can be It is set up and down on the slide bar; wherein, the upper surface of the sound insulation cover is set on the drill bit mechanism through a plurality of springs, and the sound insulation cover is also provided with a drill that matches the drill bit in the drill bit mechanism through holes, the soundproof cover can cover the workpiece to be processed. The novel metal processing drilling machine overcomes the problem that the metal processing drilling machine in the prior art has high processing noise, which affects the working environment, and iron filings generated during processing are easy to splash and hurt people.

The invention relates to a double-geared roller crusher. The double-geared roller crusher comprises a feed hopper, a smashing chamber, an outlet hopper and a machine frame, wherein a plurality of baffles are arranged inside the feed hopper oppositely in a staggered mode, a first electromotor and a second electromotor are arranged on a supporting plate on one side of the smashing chamber, and sliding rails matched with the first electromotor and the second electromotor are arranged on the supporting plate; sliding devices matched with the sliding rails are arranged at the bottom end of the first electromotor and the bottom end of the second electromotor respectively, rotary shafts are connected to the output end of the first electromotor and the output end of the second electromotor respectively, and the free end of each rotary shaft extends into the smashing chamber and penetrates through the other side face of the smashing chamber; each rotary shaft in the smashing chamber is provided with a smashing roller, a plurality of smashing teeth are arranged on each smashing roller, and the smashing teeth on the smashing roller connected to the first electromotor are engaged with the smashing teeth on the smashing roller connected to the second electromotor; a water tank is arranged on the other side of the smashing chamber, a pressure pump is arranged in the water tank, a water pipe is connected to the output end of the pressure pump, and the other end of the water pipe extends into the smashing chamber.

The invention discloses an underwater sub-wavelength local resonance type acoustic metamaterial which comprises a water area 1, a stainless steel cylindrical shell 2 and a stainless steel three-fork star-shaped cylinder 3. Included angles among three outer forks of the stainless steel three-fork star-shaped cylinder 3 are 120 degrees, and an inner cavity of the cylinder is evenly divided into three fan-shaped cavities 9, 10 and 11. The three fan-shaped cavities 9, 10 and 11 are air domains. The underwater sub-wavelength local resonance type acoustic metamaterial disclosed by the invention hasfour sections of extremely wide complete band gaps in a frequency band [0Hz, 60000Hz]. In a complete band gap, propagation of sound waves is completely cut off and cannot continue to propagate forwards, and the possibility that an underwater object is detected by sonar due to radiation noise of the underwater object is reduced. The underwater sub-wavelength local resonance type acoustic metamaterial is provided with a Dirac point, and the standardized frequency of the lowest-frequency Dirac point is 0.0072 and is far lower than 1. The sound waves near the Dirac point frequency can realize zero-phase-difference propagation without changing the wavefront formation of the sound waves, and the possibility that underwater obstacles are actively detected by sonar is reduced.

The invention mainly discloses an efficient kitchen garbage disposer and belongs to kitchen cleaning devices.The efficient kitchen garbage disposer mainly comprises an upper cavity, a middle cavity, a lower cavity, an arc-shaped cutter and a circular truncated cone grinding tool.The upper cavity, the middle cavity and the lower cavity are connected through screws, sealing rings are arranged at the connecting ends, a motor is installed in the lower cavity, the circular truncated cone grinding tool is arranged in the middle cavity, the lower end of a transmission shaft penetrates through the lower cavity and then is connected with the motor, the upper end of the transmission shaft is in interference fit with a central square hole in the bottom of the circular truncated cone grinding tool, a supporting disc is installed between the upper cavity and the lower cavity, the arc-shaped cutter is arranged in the upper cavity, the middle of the arc-shaped cutter is matched with the supporting disc, and the lower portion of the arc-shaped cutter is embedded in a square hole in the top of the circular truncated cone grinding tool, a splash guard is arranged in an end opening of the upper cavity and connected with the end opening through threads, and a waste discharging port is formed in the upper end of the lower cavity.The efficient kitchen garbage disposer has the advantages that cutting and grinding are combined, the smashing efficiency of garbage is improved, the overall structure design is ingenious, and the performance is reliable.