461results about How to "To achieve the purpose of noise reduction" patented technology

The invention relates to a method for measuring circular tunnel convergence deformation. The method includes the steps of S1, by a three-dimensional laser scanner, acquiring the working base point coordinates and tunnel point cloud of each observation station; S2, using working base points as splicing datum points to merge the tunnel point cloud into a unified reference coordinate system, and segmenting into point cloud of a multi-ring pipe joint according to the pipe joint; S3, fitting the point cloud of a single-ring pipe joint into a cylindrical face according to an improved cylindrical face fitting algorithm, extracting pipe joint axis point coordinates, projecting the cylindrical face to a plane along the axis direction of the pipe joint to obtain a two-dimensional tunnel point cloud contour line, and fitting into an ellipse according to an ellipse fitting algorithm; S4, expanding the ellipse into a three-dimensional elliptic cylindrical surface along the axis so as to obtain the three-dimensional convergence deformation of a whole tunnel. Compared with the prior art, the method has the advantages that the longitudinal axis and convergence deformation of the tunnel under construction and the tunnel under operation can be acquired, monitoring point laying is not needed, high measuring efficiency is achieved, and comprehensive monitoring data is provided to tunnel construction and operation.

The present invention discloses an icing wind tunnel hot gas anti-icing test high-precision simulation method and device. The device comprises a gas source, a pressure reduction device, a filter, an air heater, a multistage electric heating device and a test section in order from a gas input direction to a gas output direction. The gas path behind the pressure reduction device is divided into two paths, one path is heated and then is subjected to flow mixing with the other unheated path, a pneumatic switching valve in an icing wind tunnel plenum chamber is configured to divide the gas path into two paths, gas of one path enters a test section and flows out after passing through a test model to perform flow measurement, gas of the other path is flown through from the external portion of the test section and performs flow measurement, and gas of a model main path and gas of a simulation bypass path are combined into one path after passing through the wind tunnel test section and are exhausted through a flowmeter and a silencer; a cold and hot gas mixing mode is employed to rapidly reduce the high-pressure hot gas behind the air heater so as to reach the effect of rapid temperature adjustment; and the multistage electric heating device is employed to perform high-precision temperature regulation and control so as to perform high-precision temperature adjustment of high-pressure hot gas prior to the high-pressure hot gas entering a test model step by step.

The invention relates to a noise reduction PC/ABS (polycarbonate/acrylonitrile-butadiene-styrene) alloy material and a preparation method thereof. The alloy material comprises, by weight, 40-75 parts of polycarbonate resin, 15-55 parts of acrylonitrile-styrene-butadiene copolymer resin, 5-20 parts of high damping silicone rubber, 0.1-1 part of antioxidants and 0.1-1 part of lubricants. Raw materials are added into a mixer and mixed, obtained mixture is fed into a double-screw extruder through a weightless feeder and blended and granulated by the double-screw extruder to obtain the noise reduction PC/ABS alloy material. By the aid of the high damping silicone rubber, viscoelastic characteristics of PC/ABS alloys are improved, internal friction of macromolecular segments is caused by mechanical energy of noise when plastic products have noise risks, so that the mechanical energy is converted into heat energy to be dissipated, the noise risks of the plastic products are reduced, and noise can be reduced. Besides, the impact toughness of the PC/ABS alloys is improved by the high damping silicone rubber serving as a toughening agent.

The invention provides a soymilk machine head, which is arranged on a barrel body of a soymilk machine. A crushing blade and a spoiler are arranged on a rotating shaft of the machine head, wherein the spoiler sleeves on the rotating shaft, and can rotate relative to the rotating shaft, and the crushing blade drives a food material in the barrel body to rotate; the food material drives the spoiler to rotate. According to the soymilk machine head provided by the invention, the rotating shaft drives the crushing blade to rotate at high speed, and the crushing blade which rotates at high speed drives the food material to rotate in the barrel body, accordingly, under the rotation of the food material, the spoiler absorbs the kinetic energy of part of food material to rotate along with the food material in the same direction, and the rotating speed difference between the spoiler and the food material becomes small; meanwhile, by matching of the rotation of the spoiler, the food material can be stably stirred by the spoiler, accordingly, the food material is more uniformly distributed in the barrel body, the rotation of the food material is more stable, and the disturbing effect of the spoiler is more obvious; meanwhile, the noise generated by the larger rotating speed difference between the food material and the spoiler is also reduced to better achieve the purpose of noise reduction in the soymilk machine.

The invention provides an image noise reduction method and device, electronic equipment and a storage medium. The method comprises the following steps: determining exposure parameters according to a shooting scene, shooting by adopting the exposure parameters to obtain a shot image, determining a matched noise reduction model according to the equipment attribute of imaging equipment for shooting, and inputting the exposure parameters and the shot image into the noise reduction model to perform noise reduction on the shot image, wherein the noise reduction model is learned to obtain a mapping relation between the exposure parameters and the noise characteristics. According to the method, after the matched noise reduction model is determined according to the equipment attribute of the imaging equipment used for shooting, noise reduction processing is carried out on the shot image shot in the current shooting scene, and more image details are reserved while the image purity is ensured. Besides, the shot image is subjected to noise reduction through the noise reduction model matched with the equipment attribute, the noise characteristic can be better identified, the purpose of noise reduction is achieved, the noise reduction effect of the image is improved, and a clearer image can be obtained.

The invention relates to the technical field of communication, in particular to an active noise reducing method and a noise reducing earphone. The active noise reducing earphone comprises a first detection microphone arranged on an earplug and used for detecting noise signals of external environment and forming and outputting first detection signals, a second detection microphone arranged in the earplug in the voice frequency signal output direction of the earphone to detect sound in the enclosed space formed by the earplug and the ear of a person and used for forming and outputting second detection signals and a noise reducing modulation module respectively connected with the first detection microphone and the second detection microphone and used for receiving the first detection signals and the second detection signals and forming and outputting noise reducing signals according to the first detection signals and the second detection signals. The noise reducing signals are used for offsetting the noise signals and achieving the aim of reducing noise.

The invention provides an energy-saving control system and control method for a vibrating road roller, and the vibrating road roller. The energy-saving control system for the vibrating road roller comprises an electronically-controlled operation handle, a controller, an electronically-controlled engine, an electronically-controlled running pump, a running module and a running system, wherein the electronically-controlled engine, the electronically-controlled running pump, the running module and the running system are sequentially connected; the controller is connected with the electronically-controlled engine, the electronically-controlled running pump and the electronically-controlled operation handle; and the controller is capable of adjusting the rotational speed of the electronically-controlled engine and the displacement of the electronically-controlled running pump according to the position of the electronically-controlled operation handle. Through the energy-saving control system and control method for the vibrating road roller, and the vibrating road roller, the controller is capable of adjusting the rotational speed of the electronically-controlled engine and the displacement of the electronically-controlled running pump according to the position of the electronically-controlled operation handle, and the electronically-controlled engine is enabled to work at a good rotational speed, so that the purposes of energy saving and noise reduction of the electronically-controlled engine are realized; and meanwhile, the displacement of the electronically-controlled running pump is automatically adjusted through the controller to meet the power need of the whole system, so that the working stability and reliability of the system are ensured.

The invention relates to a method for reducing noise of transformer substation partial discharging pulse signals collected through pulse triggering. The method includes the following steps: (1) collecting a sample signal with partial discharging pulses, and evenly dividing the sample signal into two sections; (2) respectively carrying out wavelet transformation on the two sections of the signal, considering the section where the partial discharging pulses are located as a pulse signal section, and considering the other section as a noise window signal section; (3) carrying out wavelet transformation on the noise window signal section, and extracting maximum model values of wavelet coefficients; (4) enabling the maximum model values obtained in the step (3) to serve as threshold values to carry out noise reduction processing on the pulse signal section with a wavelet threshing value method; (5) reconstructing a partial discharging signal obtained after noise reduction according to the wavelet coefficients obtained after noise reduction and the size coefficient. Compared with the prior art, the method has the advantages that the wavelet threshold values can be dynamically extracted, the self-adaptability and the noise reduction effect of signal noise reduction can be improved, and the time difference extraction accuracy can be improved in partial discharging positioning.

The invention relates to a gear fault positioning system and method, and belongs to the field of a fault diagnosis technology and a signal processing analysis technology. The gear fault positioning system comprises a signal acquisition module, a signal processing module and a feature extraction module. By use of an order tracking method, frequency fuzziness caused by a phenomenon can be effectively overcome, by use of an angle domain synchronization average technology, random interference components such as a bearing and the like in a gear case can be eliminated, and the purpose of noise reduction is achieved; by use of spectral line editing, the disadvantage of incapability of completely filtering unnecessary frequency components due to existence of a transition zone in a conventional band pass filter can be overcome, and accordingly, a frequency band of interest is accurately filtered; influences exerted by such external factors as noise, rotation speeds, load fluctuations and the like on a phase demodulation effect can be eliminated, abrupt change of signals after demodulation at gear fault positions is more obvious, and gear faults are quite accurately positioned; and the method is easy to master and use, the algorithm meets the real-time performance requirement of an industrial field, and through actual application tests, the algorithm is accurate and reliable.

The invention relates to a vacuum-pumping system for a wind tunnel body. The vacuum-pumping system includes a multi-level air cooled lobe pump assembly, a set of heat exchangers, a silencer, an overflow valve, and a check valve; the upper part of each air cooled lobe pump is provided with an air inlet, and the lower part of each air cooled lobe pump is provided with an air outlet; two sides of each air cooled lobe pump are provided with a cool air returning opening respectively, so that heat balance of a pump body can be maintained when the pump operates under a high pressure difference; when the pressure of an air inlet connected to the back end of the lobe pump system is greater than the discharge pressure of the lobe pump assembly, a part of pumped air can be directly discharged into the silencer via the overflow valve, and then is discharged into the atmosphere via the silencer; the other part of the pumped air is discharged into the atmosphere via the overflow valve and the silencer. Each vacuum heat exchanger of the system mainly includes a housing, heat exchanger tubes, and an anti-reflux valve. A PLC control technology and a frequency converter technology are adopted by the system, so that the vacuum-pumping system can automatically adjust the pumping speed according to the pressure of an entrance.

The invention discloses a fan regulation and control method and device capable of optimizing power. The fan regulation and control method and device capable of optimizing power aim at solving the problem that in the prior art, the key point of the fan speed regulation strategy concerns about whether the temperature of a cooling part meets the requirement while the effect of the rotation speed of fans on the whole operation power consumption of a server is not evaluated completely and effectively. The fan regulation and control method capable of optimizing power comprises the steps of determining one or more fans for cooling a cooling part to be cooled down specific to the cooling part to be cooled down in a server; selecting one or more fans from the determined one or more fans for several times, regulating the rotation speed of each selected fan according to one or more fans selected every time, and recording the rotation speed and the power consumption of each selected fan when the temperature of the cooling part meets the preset temperature requirement; taking the fans selected by the time corresponding to the lowest power consumption in the obtained power consumption each time and the corresponding recorded rotation speed as the power consumption regulation and control strategy of the cooling part.

The invention discloses a WiFi indoor positioning system and method based on self-adaptive noise cancellation, and solves the problem that the indoor positioning accuracy is affected due to amplitudechange of WiFi signals due to noises. Delayers are additionally arranged between a mixed signal pickup unit and a self-adaptive noise extraction subsystem and between the mixed signal pickup unit anda self-adaptive noise canceller. Firstly, a one-dimensional basic coordinate system is built in an offline stage; a position fingerprint database is constructed; in an online stage, the signals related to the noises and unrelated to WiFi are extracted firstly; the noises are cancelled, and the real WiFi signals are extracted; and data is matched to complete positioning. Delay values l of the two delayers are synchronously adjusted; the WiFi signal at the (k+l) moment is predicted by using the WiFi signal at the k moment; the output signals are in maximum correlation with the real WiFi signalsand rapidly approach the real WiFi signals; the convergence and stability of the filter are relatively high; the WiFi error rate caused by the noises is reduced; the signal-to-noise ratio of the WiFisignals is improved; and the indoor positioning accuracy is improved. The WiFi indoor positioning system and method is used for WiFi indoor positioning.

The invention relates to a cup base component mounting structure of a glass stirring cup. The cup base component mounting structure comprises a cup body, a cutter set, a base plate, a cup base and aninner cup frame. The cutter set is rotationally arranged on the base plate, and is located in an inner cavity of the cup body. An opening is formed in the bottom of the cup body. The base plate coversthe opening. The inner cup frame is arranged in the cup base. A cavity is formed in the top of the inner cup frame. A carrying platform is arranged on the inner wall of the cavity. The base plate isarranged on the carrying platform. An inner seal ring is arranged at the edge of the base plate. The inner wall, corresponding to the upper side of the carrying platform, of the cavity is in threadedconnection with the lower portion of the cup body. The inner seal ring and the edge of the base plate are compressed at the bottom of the opening. The cup base component mounting structure has the advantages that the inner cup frame is added to the cup base component mounting structure and is assembled with the base plate, and the bottom of the inner cup frame is connected to the outer portion ofthe cup base directly, so that the assembly effect is good, and water leakage caused by malalignment due to inaccurate assembly of the cup base and a glass cup is avoided.

The invention discloses an adaptive beam forming method for reducing voice distortion, and the method is characterized in that the method comprises the following steps: recording environment sound, and forming an input signal; carrying out the beam forming through a fixed beam forming device, and obtaining a noise-containing voice signal from the input signal; carrying out the filtering of the input signal through a blocking matrix module, so as to form a coherent noise signal; removing the coherent noise signal from the noise-containing voice signal through an adaptive removing module, and forming and outputting an output signal; obtaining a residual noise signal from the output signal, and feeding back the obtained residual noise signal to the adaptive removing module, so as to update the filtering coefficient of the adaptive removing module, thereby achieving the adaptive filtering for reducing the noise signal in the output signal. The method can guarantee the smaller distortion of a target signal while reducing the noise.

The invention provides an air conditioner unit and a suspension type overhead rail vehicle with the air conditioner unit. An indoor unit of the air conditioner unit is mounted on the top of one end of a compartment of the rail vehicle, and an outdoor unit is mounted on a floor at one corresponding end of the interior of the compartment. The outdoor unit is mounted inside the compartment, and idle space at a hall can be fully and reasonably utilized; the dilemma that no place on the outer portion of the vehicle is provided for installing the outdoor unit is solved, and meanwhile installing and maintenance are also convenient; and the construction efficiency is improved, and installing quality is ensured. Meanwhile, the length of a pipe between the outdoor unit and the indoor unit is decreased, and the cost is reduced; and the outdoor unit is mounted on the floor, the stability of the outdoor unit is improved, and the running noise can be effectively reduced.

The invention relates to an image noise reduction method based on Primal Sketch correction and matrix filling. The image noise reduction method comprises, at least, step 101, adopting a Primal Sketch model to obtain a sketch map P of a noise adding image I1; step 102, providing a two-stage sketch line correction rule and a corrected sketch map P and designing a direction window for a pixel point on each sketch line segment in the corrected sketch map P in the direction of the sketch line segment to obtain a region map, mapping the image I1 into a structural region E1 and a non-structural region E2 according to the region map; step 103, simultaneously utilizing an image block variance statistic method to divide the image I1 into a smooth region E3 and a non-smooth region E4; step 104, respectively marking the smooth region and the non-smooth region overlapped with the non-structural region as a smooth region E23 and a non-smooth region E24; step 105, adopting the image noise reduction method based on the matrix filling to perform noise reduction on the E1 and the E24 and adopting a non-local average method to perform noise reduction on the E23; step 106, merging noise reduction results of the E1, the E23 and the E24 to obtain a final noise reduction result map of the image I1.

The exhaust silencer with variable exhaust pipe cross section of internal combustion engine includes one casing, one air inlet silencing pipe and one exhaust silencing pipe inside the casing cavity, three partition boards set inside the cavity to separate the cavity into four chambers and one intermediate silencing pipe. The air inlet silencing pipe has its closed end penetrating the front end cap, the first partition board and two chambers and combining with the second partition board. The exhaust silencing pipe includes two pipes of different lengths and sizes, their closed ends penetrate the back end cap and the last chamber and combine with the third partition board, and the large and short pipe has one exhaust control valve in the opened end. The intermediate silencing pipe has its opened end located inside the second chamber and the closed end inside the third chamber.

The invention discloses a marine main engine base based on quiet technology and elastic damping. The marine main engine base comprises two sets of upper-layer supporting wrist plate assemblies, a lower-layer supporting wrist plate assembly and a plurality of elastic damping supports respectively arranged between each of the two sets of upper-layer supporting wrist plate assembly and the corresponding lower-layer supporting wrist plate assembly. Each upper-layer supporting wrist plate assembly comprises a bar-shaped panel, a plurality of upper-layer supporting wrist plates, a supporting angle iron and an upper vertical plate; the lower-layer supporting wrist plate assembly comprises two H-shaped sectional materials, a plurality of lower-layer supporting wrist plates, a plurality of external transverse bar plates and a plurality of external vertical plates. The marine main engine base based on quiet technology and elastic damping is compact in structure and convenient to manufacture, adopts modular design, and is wide in application range; when the marine main engine works, generated vibration is downwards transmitted to the supporting angle irons and the upper-layer supporting wrist plates through the bar-shaped panels, and finally most vibration is eliminated by the elastic damping supports. Vibration of the lower-layer supporting wrist plates is reduced, and thereby the purpose of reducing noise is achieved. Through tests, the marine main engine base based on quiet technology and elastic damping can achieve a 30% reduction in vibration, thus being significant in damping effect.

The invention relates to the technical field of an earphone, especially to a head-mounted noise-cancelling headphone comprising an active noise reduction capsule arranged inside a case of the head-mounted noise-cancelling headphone. The active noise reduction capsule includes a housing having a front shell and a rear shell; and the front shell and the rear shell are buckled mutually to form a sealed cavity. Besides, the active noise reduction capsule also includes a loudspeaker, a microphone, and a damping fin; the loudspeaker assembled at the back of the front shell is arranged inside the sealed cavity; the microphone installed at the front side of the front shell is arranged outside the sealed cavity; and the damping fin installed on the rear shell is used for adjusting an audio curve and the tone quality. The invention aims at providing a head-mounted noise-cancelling headphone, so that a technical problem that the noise cancelling effect of the existing noise-cancelling headphone is affected because of different sound cavities of the left ear and the right ear can be solved.

The invention provides a noise reducer for a pump, which is composed of a base, a vibration isolator and an enclosing cover. The vibration isolator is arranged on the base, and a pedstral used for the installation of the pump is arranged on the vibration isolator; the enclosing cover is composed of an enclosing wall and an enclosing top, the enclosing wall may be in the shape of a square column, a cylinder or a polygon prism and comprises a block or a plurality of block components, and each block of the block components is connected with each other in a seamless way; air outlets are arranged on four sides of the enclosing wall; and corresponding positions thereof are provided with trepan borings of inlet and outlet pipelines of the pump and the trepan borings of wires of a motor, and each trepan boring is sealed via sealing strips; the upper end and the lower end of the enclosing wall are respectively connected with the enclosing top and the base in a sealing way, an air inlet is arranged in the middle of the enclosing top; noise elimination screens are respectively fixed on external sides of the air inlet and the air outlet, and a noise elimination plate is fixed in the enclosing cover at a position corresponding to the pump. The invention has the advantages of sound absorption, noise elimination, sound insulation and vibration isolation of the pump, fine noise elimination effect, novel structure, convenient assembling and disassembling, good heat dissipation and low cost.

The invention discloses a switch reluctance motor comprising a motor base, wherein a stator is arranged on the motor base; a stator winding is wound on the stator; a rotor is arranged in the stator; a rotor shaft is fixed in the rotor; the motor base is provided with a front end cover and a rear end cover; the stator, the rotor and the rotor shaft are located in a sealed space defined by the front end cover and the rear end cover; a rotary transformer is arranged between the front end cover and the rotor; the transformer rotor of the rotary transformer is fixedly connected with the rotor shaft; the transformer stator of the rotary transformer is fixedly connected with t he front end cover; the stator winding is a three-phase concentrated winding; the stator and the rotor are in a doubly salient structure; eighteen magnetic poles are uniformly distributed on the stator; twelve magnetic poles are uniformly distributed on the rotor; and magnetic poles on the stator and the rotor are in a trapezoid gear structure. With the advantages of simple structure, reliable work, steady operation, small torque pulsation and low noise, the motor is conveniently applied on automobiles.