25results about How to "Achieve filtering" patented technology

The invention relates to the technical field of signal processing, in particular to an unmanned aerial vehicle self-noise filtering method and system based on multichannel time-frequency spatial filtering. The method comprises the following steps: acquiring a multi-channel noise-containing sound signal by using a microphone array carried by an unmanned aerial vehicle, and performing short-time Fourier transform to obtain a frequency domain signal; estimating a ratio mask by using a deep neural network, and performing logarithm normalization processing on the frequency domain signal; remodeling the sound signal to match the FFT length of the time-frequency spatial filter, and constructing the time-frequency spatial filter in combination with the multi-channel ratio mask; removing the self-noise of the unmanned aerial vehicle by using the filter and obtaining a target sound signal; and finally, converting the frequency domain signal into a time domain signal through inverse short-time Fourier transform. Through innovative fusion of multi-channel acquisition, deep learning and time-frequency space filtering, the self-noise of the unmanned aerial vehicle in a complex environment is accurately filtered, and the accuracy and efficiency of transformer substation noise monitoring are remarkably improved. Reliable acoustic data are provided for state monitoring of the power equipment, and the method has important engineering application value.

The invention relates to a thin film thickness measuring device, an excitation signal frequency determining method thereof and terminal equipment, and the device comprises a housing which comprises an opening; the test coil circuit comprises a test coil and a first transmission line connected between the test coil and the signal processing circuit, and the test coil is close to the opening so as to generate a test alternating magnetic field penetrating through the opening and output a test signal; the reference coil circuit comprises a reference coil and a second transmission line connected between the reference coil and the signal processing circuit, and the reference coil is far away from the opening so as to generate a reference alternating magnetic field which cannot pass through the opening and output a reference signal; the amplifying circuit is used for performing differential operation on the test signal and the reference signal to obtain a differential signal, and performing phase-locked filtering processing on the differential signal based on the frequency of the excitation signal to obtain a phase-locked signal; and the signal processing circuit is used for generating an excitation signal with a set frequency and outputting a test signal according to the phase-locked signal. The method has the advantage of high film thickness accuracy.

The invention relates to a THI millimeter wave cloud radar clear sky echo filtering method, device and equipment, and the method comprises the steps: carrying out the marking of clear sky echoes or meteorological echoes through employing the dual-mode characteristics of space-time physical information combination for sample data of each channel in a sample data set; marking the sample data of each channel, constructing a corresponding fuzzy logic membership function according to the marked sample data of each channel, obtaining membership degrees of clear sky echoes and meteorological echoes from the base data of different channels in the original THI data obtained through actual measurement by using the corresponding fuzzy logic membership functions, and inputting the membership degrees of the channels into a trained classification identification model, and identifying clear sky echoes and meteorological echoes in the original THI data to realize filtering of the clear sky echoes. By adopting the method, clear sky echoes can be accurately filtered.

The invention discloses a staged sewage treatment box capable of scraping sludge, and relates to the technical field of sewage treatment.The staged sewage treatment box comprises a mixing box, a flow guide box is fixedly installed at the top of the mixing box, a filtering box is fixedly installed at the top end of the flow guide box, and a positioning frame is movably installed in the filtering box; a fixing cover is fixedly installed on the rear side of the top of the positioning frame, and a filtering plate is installed at the bottom of the positioning frame. Large-particle impurities before sewage treatment can be filtered out through the positioning frame and the filter plate, the situation that the large-particle impurities enter the sewage treatment box to affect the sewage treatment effect is avoided, the mixing stirring mechanism is matched with the intermittent chemical injection mechanism, the mixing uniformity between sewage and chemicals can be improved, the sewage treatment effect is improved, and the sewage treatment efficiency is improved. Wherein the arrangement of the transmission discharging mechanism is convenient to cooperate with the mixing and stirring mechanism for sealing during treatment and starting for discharging after treatment, and the structural linkage among sewage mixing, medicament adding and discharging procedures is improved.

The invention relates to the technical field of sensor signal processing, in particular to a vibrating wire sensor anti-interference circuit and device, and the circuit comprises an interference suppression circuit, a differential amplification circuit, a clamping circuit, a low-pass filter circuit, a zero cross detection circuit and a processing module. The input end of the interference suppression circuit is used for being connected with a vibrating wire sensor, the output end of the interference suppression circuit is connected to the input end of the differential amplification circuit, the output end of the differential amplification circuit is connected to the input end of the clamping circuit, the output end of the clamping circuit is connected to the input end of the low-pass filtering circuit, and the output end of the low-pass filtering circuit is connected to the input end of the vibration wire sensor. The output end of the low-pass filter circuit is connected to the input end of the zero-cross detection circuit, and the output end of the zero-cross detection circuit is connected to the processing module. According to the invention, interference signals can be removed so as to obtain accurate signals to be detected.

The invention provides a polylactic acid fluffy nano fiber membrane capable of efficiently filtering out gas and particulate matters and a preparation method thereof. The method comprises the following steps: S1, preparing a stereocomplex crystal SC; step S2, preparing an SC crystal electret polylactic acid fluffy nano fiber membrane; step S3, preparing an MOF type nanocrystal growth precursor solution; and step S4, preparing the MOF SC crystal electret polylactic acid fluffy nano fiber membrane. The polylactic acid fluffy nano fiber membrane capable of efficiently filtering out the gas and the particulate matter can be used for scenes such as air purification, industrial waste gas treatment and indoor environment governance. The prepared MOF SC crystal electret polylactic acid fluffy nano fiber membrane has the advantages of high fluffy degree, high-efficiency low-resistance filtering performance, strong carbon sequestration performance and high formaldehyde and CO adsorption efficiency, and the application of a polylactic acid biological material in the fields of air purification and toxic gas trapping is effectively extended.

The present invention provides a point cloud background filtering method for intelligent roadside equipment, comprising the following steps: acquiring point cloud data; preprocessing the point cloud data to obtain preprocessed point cloud data; performing background filtering on the preprocessed point cloud data to obtain a filtered foreground point set. The point cloud background filtering method for intelligent roadside equipment of the present invention can effectively and efficiently filter out background points in the background point cloud in real time.

The utility model relates to an anti-surge ventilation type pressure water level gauge which comprises a hydraulic cable, a lightning protection module, an RS485 communication module, an LDO module, a single-chip microcomputer module and a pressure sensor. The hydraulic cable comprises a cable core and a shielding layer, the shielding layer is arranged on the periphery of the cable core, one end of the cable core is coupled to the lightning protection module, the other end of the cable core is coupled to the pressure sensor, and the lightning protection module comprises a first lightning protection sub-module and a second lightning protection sub-module; the first lightning protection sub-module is coupled to the LDO module, and the LDO module is coupled to the single-chip microcomputer module. The second lightning protection sub-module is coupled to the RS485 communication module, the RS485 communication module is coupled to the single-chip microcomputer module, the RS485 communication module is coupled between the second lightning protection sub-module and the second single-chip microcomputer module, the pressure sensor is connected to the single-chip microcomputer module, and through the design of the lightning protection module and the shielding layer, lightning stroke can be prevented, the interference resistance of the water level gauge equipment is improved, and the working efficiency is improved.

The utility model discloses a wiredrawing heat preservation device for chemical fiber rope net production, which comprises a water tank and inlet and outlet notches, the inlet and outlet notches are respectively arranged above the left side and the right side of the water tank, three groups of upper gears are movably connected above the front end of the inner side of the water tank, and three groups of lower gears are movably connected below the front end of the inner side of the water tank. Guide rollers are transversely welded to the rear portions of the upper gear and the lower gear respectively. According to the wiredrawing heat preservation device for chemical fiber rope net production, guide rollers are transversely welded to the rear portions of an upper gear and a lower gear correspondingly, silk threads can be pressed by a positioning plate controlled by an air cylinder, movement of the silk threads can be stopped, every two vertically-adjacent guide rollers in a water tank form a group, and a main guide gear is rotated after a motor is started; the upper gear opposite to the main guide gear is directly pushed to operate, the lower gear opposite to the main guide gear is pushed to rotate reversely under the limitation of the transmission gear, then the silk threads are transmitted, and the problem that the heat preservation path is short is solved.

This invention discloses a radar target tracking method based on spatiotemporal clustering and a multi-physics model, belonging to the field of radar target tracking technology. The method includes the following steps: S1, inputting radar point target data; S2, adaptive spatiotemporal clustering to remove noise; S3, establishing a multi-physics model and adaptive threshold weight matching point-by-point and track-by-track; S4, cyclic matching of predicted points; S5, integrating matching scores S1, S2, ..., Sn from the matching score queue; S6, taking the point corresponding to the optimal matching score as the output result. This invention proposes a multi-physics model matching and judgment approach, constructing multiple target motion physical models and combining the target's historical motion state with the current point's adaptability analysis. Even in complex scenarios such as changes in target motion patterns and multiple trajectory intersections, it can accurately identify point ownership, effectively solving the problems of insufficient robustness and poor adaptability of traditional methods, and significantly improving the continuity and accuracy of target tracking in complex scenarios.

This application relates to the field of precision turning technology for motor housings, specifically to a method, equipment, and apparatus for precision turning motor housings in heavy-duty truck transmission systems. The method includes: acquiring multiple modal inherent frequency bands of the machine tool tip; during the precision turning of the motor housing, real-time acquisition of sound pressure signals and machine spindle speed signals; pre-setting an update cycle for speed disturbance parameters; for each cycle, decomposing the sound pressure signal into signal components; screening out candidate chatter signal components suspected of containing chatter information; identifying and filtering out background noise components in each candidate chatter signal component; reconstructing each candidate chatter signal component; and then recombining them to obtain the target chatter frequency band signal; evaluating the chatter development status in the current cycle; and updating the speed disturbance parameters for the next cycle. This application aims to effectively ensure the precision turning accuracy of motor housings by improving the chatter suppression effect during precision turning.

The present invention relates to a metal detector and a receiving circuit and a detection circuit thereof, wherein the receiving circuit includes a selection switch and a plurality of receiving units, wherein each receiving unit is composed of two receiving coils symmetrically arranged at both ends of a transmitting coil, and the transmitting coil and all the receiving coils are arranged in a straight line, the control signal input end of the selection switch is connected to a host computer, and each receiving unit is selectively connected to an output end through the selection switch. Compared with the prior art, the present invention provides multiple groups of receiving units to selectively connect to the next level, thereby providing different signal frequencies, thereby filtering out vibration interference that is originally the same as the signal frequency.

The present invention discloses a dual-fed circularly polarized filtering antenna and its array and application. The antenna includes a multi-layer printed circuit board arranged from top to bottom. The upper surface of the first layer of printed circuit board is provided with a first radiation patch and a super-surface structure, the lower surface is provided with a second radiation patch, any layer of the middle several layers of printed circuit boards is provided with two filter branches, and the bottom layer of printed circuit boards is provided with two coplanar waveguide feed lines with ground; the antenna also includes two quasi-coaxial feeding structures, the top of the quasi-coaxial feeding structure is connected to the second radiation patch, and the bottom end is connected to the coplanar waveguide feed line with ground. The antenna adopts a super-surface structure, which is helpful to suppress surface waves, realize large-angle scanning and antenna miniaturization, adopts a double-layer radiation patch to enhance the radiation capability, adopts a dual feed line structure to realize circularly polarized waves and polarization reconstruction capabilities, and adopts a filtering branch to realize isolation of high-frequency signals. The above design can achieve circular polarization reconfigurability, large scanning angle, high isolation and other performances, making the antenna array more suitable for satellite communications.

The embodiment of the utility model discloses a mode filtering optical fiber and a laser device thereof. The mode filtering optical fiber comprises a fiber core, an inner cladding and an outer cladding, wherein the inner cladding comprises a matrix material and dielectric cylinders; the dielectric cylinders surround the fiber core and are periodically arranged in the matrix material in multiple layers, the dielectric cylinders on the inner layer are arranged in a regular hexagon shape, the dielectric cylinders on the outermost layer comprise four dielectric cylinder groups, and each dielectric cylinder group comprises three dielectric cylinders; a mode capable of being transmitted in a microstructure area formed by the dielectric cylinders and the matrix material forms a super-mode group, and an interval formed by the effective refractive index of the lowest-order mode and the effective refractive index of the highest-order mode in the super-mode group is a super-mode group interval. And the leakage loss of the fiber core mode in the super mode group interval is greater than that of other fiber core modes of which the effective refractive index is not in the super mode group interval. According to the utility model, large-mode-field and pure-fundamental-mode transmission is realized, and the dielectric cylinders are regularly arranged, so that the optical fiber is formed by tapering after being stacked in a rod shape, and the transmission mode of the few-mode optical fiber is effectively controlled.

The utility model discloses a visible light imaging device capable of transmitting fog, which comprises a visible light lens, an optical switching mechanism and a camera which are sequentially arranged along a light path, the optical switching mechanism comprises a driver, visible light color glass and fog-transmitting glass, and the visible light color glass and the fog-transmitting glass are driven by the driver to be alternatively arranged in the light path. According to the imaging device, on the basis that conventional color visible light imaging can be achieved, fog-penetrating imaging under bad weather conditions can be achieved, and good environmental adaptability is achieved.

The invention provides an EFT filtering processing method and system, and belongs to the technical field of signal processing. The method comprises the following steps: circularly storing a first preset number of latest acquired signal data to a predefined array; calculating a first signal change value between each signal data in the predefined array and the adjacent signal data collected at the previous moment; calculating a signal mean value of the second preset number of latest collected signal data; judging the difference value change of a third preset number of continuous and latest collected signal data to obtain a second signal change value; and determining an output signal effective value according to the signal mean value, the first signal change value, the second signal change value, the current signal effective value, a preset take-off value and a preset tolerance value. By setting the preset take-off value and the preset tolerance value, spikes generated when the signals are interfered are filtered out, and filtering out of the EFT signals is achieved.

The invention relates to the technical field of emulsifier wastewater treatment, in particular to an oil-water separator for emulsifier wastewater treatment, which comprises a frame and a reaction module arranged on the frame, and the reaction module is provided with a reaction cylinder capable of bearing wastewater and a lifting element capable of lifting wastewater; the separation module is coaxially and fixedly arranged outside the reaction module in a vertical state through a first mounting frame and is communicated with a top outlet of the reaction cylinder; the separation module is provided with a separation bin, and the separation bin is provided with a first separation cavity and a second separation cavity; when wastewater enters different chambers, different separation effects can be presented; a vertical driver capable of longitudinally pushing and lifting the reaction cylinder is also arranged at the bottom of the rack and is used for driving the reaction cylinder to be communicated with the first separation cavity and the second separation cavity respectively; the device can perform targeted separation treatment on wastewater according to different stages of wastewater treatment, and is good in filtering effect and high in efficiency.

The invention discloses a stainless steel foam filter material and a preparation method thereof, and relates to the technical field of filter material application, the stainless steel foam filter material is formed by uniformly distributing stainless steel powder adhesive slurry on a foam sponge framework material carrier and sintering and shaping, a plurality of pores are uniformly distributed in the stainless steel foam filter material, the porosity is 20-30 / inch, the porosity is greater than or equal to 82%, and the filter precision is 2.5-3.5 mm. The filtering efficiency is more than 99.6%, and the device is used for filtering and cooling the produced slurry and uniformly mixing multiple slurries. The preparation method mainly comprises the steps of preparing raw materials, coarsening a foam sponge framework material, preparing stainless steel slurry, preparing a stainless steel foam block green body, drying the green body, degreasing, sintering and molding and the like, and a stainless steel foam filtering product which is better in filtering effect, high in strength, light in weight, resistant to high temperature of 800 DEG C, resistant to corrosion and abrasion and extremely high in fluid smoothness is obtained. And meanwhile, various slurries are mixed more uniformly and finely, the production process fineness of slurry products is improved, and the production quality of final products is improved.

The invention provides a plastic raw material fine crushing device and method, and belongs to the technical field of plastic crushing devices. Comprising a mounting supporting piece, a crushing part is mounted on the mounting supporting piece, and two circles of crushing detection pieces are mounted on the crushing part; the two circles of crushing detection pieces are used for crushing and shredding plastic raw materials; and the crushing part is used for driving the two circles of crushing detection pieces to rotate. The plastic raw material fine crushing device solves the problems that an existing plastic raw material fine crushing device is prone to abrasion in the crushing process, crushing teeth are difficult to attach to adjacent rollers, the cutting effect is affected, and abrasion detection prompting is inconvenient to achieve. The crushing detection part is adopted, continuous crushing work can be kept, meanwhile, precision detection work can be conducted regularly, and the situation that crushing teeth are excessively abraded and cannot be found, and consequently the crushing and cutting-off effect is affected is avoided.

The present invention belongs to the technical field of gas treatment, and specifically is a treatment device for radioactive gas before discharge, comprising a catalyst reactor, an activated carbon adsorber is fixed on one side of the catalyst reactor, an exhaust pump is fixed on the side of the catalyst reactor away from the activated carbon adsorber, an air intake box is installed on the side of the activated carbon adsorber away from the air intake box, an air intake pipe is fixed on the top of the air intake box, and a pretreatment structure for filtering solid particles in the gas is arranged inside the air intake box; the airflow generated by the inlet and outlet gases drives the wind wheel to rotate, the wind wheel drives the transmission roller to roll to make the metal mesh belt roll, the metal mesh belt rolls and gets wet inside the air intake box, the air intake pipe blows out gas to blow away the moisture inside the metal mesh belt, and at the same time, the solid particles inside the gas are adsorbed by the moisture and fall together into the inside of the air intake box, so that the solid particles can be filtered out.

The utility model discloses deionization washing equipment for aluminum alloy anodic oxidation, which comprises a tank body and a slot, the slot is arranged at the top of the tank body, an interception frame is longitudinally inserted in the slot, connecting sleeves are welded at four corners of the bottom of the interception frame, support tables are welded at two sides of the bottom end in the tank body, and the support tables are connected with the tank body. Threaded rods are movably connected to the two sides of the bottom end in the pool body. According to the deionizing water washing equipment for aluminum alloy anodic oxidation, interception frames are longitudinally inserted into the inserting grooves, the interception frames are placed between the tops of the supporting tables, aluminum alloy accessories hung by hanging tools above are deposited in the pool body, the aluminum alloy accessories are taken away after deposition is finished, a long rod is rotated after a motor on the right side is started, and then the aluminum alloy accessories are placed in the pool body. First gears on the two sides are meshed with second gears, so that four sets of threaded rods rotate in situ, meanwhile, a connecting sleeve and an interception frame in the center of the connecting sleeve are lifted, internal residues are cleaned, and the problem of lack of a filtering assembly is solved.

The present application relates to an object detection method, device, electronic equipment and storage medium. The object detection method comprises: obtaining first point cloud data obtained by scanning a lane area corresponding to a vehicle; obtaining first road edge data obtained by performing road edge detection on the first point cloud data, performing augmentation processing on the first road edge data to obtain second road edge data; determining second point cloud data located in a lane area in the first point cloud data based on the second road edge data, and clustering the second point cloud data to obtain a candidate object; determining a target area in the lane area based on the first road edge data, and determining the candidate object in the target area as a target object to be detected. The embodiments of the present application can filter out interference data in the lane area outside, and filter out virtual targets in the lane area inside. The embodiments of the present application can filter out candidate objects outside the target area, and improve the accuracy of detecting the target object.

The invention provides a filtering processing method and system, and belongs to the technical field of signal processing. The method comprises the following steps: calculating a mean value, a first-order derivative and a first-order derivative mean value of collected original data; and determining the number of first dead pixels in the original data according to the mean value of the original data. And determining the number of second dead pixels in the first-order derivative according to the first-order derivative of the original data and the first-order derivative mean value. And judging a current waveform quality result based on the first dead pixel number and the second dead pixel number. And comparing the current waveform quality result with the waveform quality result at the preorder moment to obtain a comparison result, and determining a filtering processing scheme based on the comparison result. And quantitatively calculating the quality of the waveform according to the fluctuation degree of the original data and the fluctuation degree of the first-order derivative, judging the availability of the collected original data according to the waveform quality, and determining an output mean value. By selecting the output mean value, the data with better waveform quality is selected to replace the interfered data, so that the interference is filtered.