1488 results about "Filter effect" patented technology

The invention relates to the field of signal processing, and discloses a biological signal processing method and device, computer equipment and a storage medium, and the method comprises the steps: collecting a biological signal, and carrying out the preliminary filtering of the biological signal, and obtaining a preliminary filtering signal; performing noise characteristic analysis on the preliminary filtering signal, selecting a proper filtering mode according to an analysis result, and designing filter parameters through fuzzy logic processing; inputting the filter parameters into an adaptive filter to process the signal so as to obtain a filtered biological signal; in combination with a de-noising convolutional neural network model, noise identification and fuzzy logic processing are performed on the filtered biological signals, and filter parameters are dynamically adjusted; and performing multi-round iterative optimization until a target filtering effect is obtained, and outputting an optimized biological signal. According to the biological signal processing method, complex noise in the biological signal is effectively removed, the filtering precision is improved, meanwhile, the signal integrity is kept, and a reliable basis is provided for subsequent biological signal analysis and processing.

The invention relates to the technical field of image processing, in particular to a slope deformation monitoring method based on image recognition, and the method comprises the steps: obtaining a slope interferometric phase diagram; segmenting the slope interferometric phase diagram to obtain a plurality of sub-regions, and obtaining local differences of phase points in the sub-regions; determining the difference expression degree of the phase values corresponding to the phase points and the phase difference of the sub-regions; carrying out region segmentation; determining distribution similarity and overall similarity of adjacent sub-regions when segmentation is finished; calculating the comprehensive similarity of the sub-regions at the end of segmentation; carrying out region merging; and filtering is carried out according to the standard deviation of the final sub-region so as to realize slope deformation monitoring. By dynamically judging whether region segmentation and merging are carried out or not, compared with a fixed threshold mode, the method is more accurately adapted to the spatial variability of a deformation mode in a slope interferometric phase diagram, the quadtree filtering effect is effectively improved, and slope deformation monitoring is more accurate.

The invention discloses a multi-scale hierarchical efficient filtering method considering topographic features, which can efficiently extract a large number of uniformly distributed accurate ground seed points and ensure the accuracy of an initial topographic surface by introducing a method of combining a sliding grid technology and an M estimation sample consistency algorithm. Then, constructing a ground reference surface grid according to the ground points subjected to iterative recognition, and quickly generating a ground reference surface by adopting a grid-based global weighted finite difference TPS method; and finally, establishing a self-adaptive threshold value considering topographic features to capture ground points, thereby effectively improving the point cloud filtering precision in a complex scene. The filtering method is stable in performance and good in filtering effect in a large-scale scene with complex terrain and mixed ground features, and the filtering method is high in filtering precision, high in calculation efficiency and high in terrain adaptive capacity. Meanwhile, the filtering method is high in operation speed and has the performance advantage of processing large complex scenes.

The invention discloses an impeller assembly, a pre-filter applying the impeller assembly and a water consuming system, and relates to the technical field of pre-filters, the impeller assembly comprises an impeller body and a mounting seat, the impeller body is provided with a connecting part, and the connecting part is used for being in transmission connection with an outer framework of the pre-filter; the mounting seat is provided with an impeller cavity, the impeller body is rotatably mounted in the impeller cavity, and one axial side of the mounting seat is provided with a first water inlet communicated with the impeller cavity and the outside of the mounting seat; a second water inlet communicated with the impeller cavity and the outside of the mounting seat is formed in the peripheral side of the mounting seat; a water outlet communicated with the impeller cavity and the outside of the mounting seat is formed in the other axial side of the mounting seat; and the water outlet is used for being communicated with a drain outlet of the pre-filter. According to the technical scheme provided by the invention, the flushing efficiency and the drainage efficiency of the pre-filter can be improved; the water flow drives the outer framework to rotate, so that the self-cleaning capability and the filtering effect of the equipment are further improved.

The invention discloses position-free control based on a set time sliding mode observer and a time-varying parameter expansion state observer, and belongs to the technical field of permanent magnet synchronous motor sensorless control. The invention provides a composite control method combining a set time sliding-mode observer and a time-varying parameter extended state observer, and aims to solve the problems that the convergence time of a traditional sliding-mode observer depends on an initial state, buffeting is serious, disturbance is sensitive and the like. The method specifically comprises the following steps: designing a sliding-mode observer with a set time convergence characteristic, and ensuring that an observation error is converged in a preset time and is irrelevant to an initial value by dynamically adjusting a sliding-mode surface index item; high-frequency buffeting is suppressed by combining an integral filtering effect; a time-varying parameter expansion state observer is further designed by utilizing the saturation characteristic of a bitangent function and the characteristics of small error, large gain, large error and small gain of a fal function, the initial differential peak value is effectively inhibited, and the total disturbance of the system is compensated in real time. And the advantages of controllable convergence time, small buffeting and high interference resistance are verified through simulation. The anti-interference capability and the dynamic response speed of the system are remarkably improved, and the method is suitable for permanent magnet synchronous motor sensorless control under medium and high speed working conditions.

The invention relates to the technical field of power line communication, in particular to a signal noise reduction method and system for improving power line communication quality, and the method comprises the steps: carrying out the filtering of a power line communication signal at different synchronization lengths; analyzing the volatility of the local range of each power line communication signal value; comparing the distances between the original extreme value signal sequences before and after filtering to obtain a filtering effect of each power line communication signal value based on different synchronization lengths; obtaining a denoising selection weight of each power line communication signal value; based on the prediction result of the filtering weight of a preset number of signal values before each power line communication signal value, combining the signal distribution similarity in the window corresponding to the power line communication signal values and the denoising selection weight to obtain the filtering weight of each power line communication signal value, and weighting the filtered signals to obtain the power line communication signal value. And obtaining a final filtering value of each power line communication signal value. The invention aims to improve the de-noising quality of the power line communication signal.

The present invention relates to the field of medical device technology, and provides an interference signal processing method and device, wherein the interference signal processing method includes: when a change in the level state of a signal is detected, timing is started; if the signal maintains the current level state without change within a first preset time, the current output level state of the output signal is converted to the current level state of the signal; if the signal changes its level state again within the first preset time, the timer is cleared for timing the level state of the signal before the level state changes again; when a level state change phenomenon that occurs multiple times in a row within the first preset time is detected, the signal is judged to be an interference signal. The present invention can filter out larger interference bands, has better filtering effect, and has strong anti-interference ability.

The present invention discloses a low-voltage harmonic filter module, which relates to the technical field of circuit devices. This low-voltage harmonic filter module includes a filter body and a base, a plurality of shock-absorbing mechanisms are arranged between the filter body and the base, and each shock-absorbing mechanism includes an L-shaped plate, a first mounting mechanism is arranged between the bottom of each L-shaped plate and the base, and the side wall of each L-shaped plate is fixedly connected with a connecting plate, the side wall of the connecting plate is fixedly connected with an annular cover, and a moving column is inserted in the annular cover, a rubber ring is fixedly connected between the moving column and the annular cover, and a first spring is fixedly connected between the moving column and the bottom of the annular cover, and a second mounting mechanism is arranged between the moving column and the filter body. This low-voltage harmonic filter module can have a good shock-absorbing effect on the filter body, ensure its filtering effect and service life, and at the same time, it can consume the energy generated by the vibration, so that the shock-absorbing effect is better.

The invention provides a heat exchanger with an anti-blocking function, which comprises a fixed clamping plate and a movable clamping plate, and a plurality of plate sheets are arranged between the fixed clamping plate and the movable clamping plate. Alternate use of the arc-shaped filter screens is achieved through the rotating design of the second closed barrel, when the filtering effect of a certain filter screen is affected by impurity accumulation, other unblocked filter screens can work in time, it is guaranteed that liquid is continuously and smoothly filtered, the situation that the heat exchange process is interrupted due to blockage of a single filter screen is avoided, and efficient operation of equipment is maintained; the arc-shaped filter screens are backwashed through the spray heads, the four filter screens can be comprehensively cleaned in sequence in cooperation with rotation of the second closed barrel, when deep cleaning is needed, the output shaft of the servo motor rotates clockwise to drive the spray heads to move in a reciprocating mode, more thorough washing is achieved, impurities attached to the filter screens are effectively removed, and the service life of the filter screens is prolonged. The service life of the filter screen is prolonged and the equipment consumable replacement cost is reduced.

The invention provides an image real-time filter processing method based on edge calculation, and the method comprises the steps: obtaining the local texture feature distribution of an input image, calculating the gradient variation of each pixel point in the horizontal and vertical directions, and calculating a quantitative index value reflecting the image texture complexity based on the statistical distribution feature of the gradient variation; executing a parallelized filter effect rendering operation based on the optimized processing task allocation scheme, and applying corresponding filter parameters to each image block through a multi-thread cooperative processing mechanism to form filter rendering configuration information suitable for the performance of the current mobile device; and carrying out fusion reconstruction on brightness, saturation and hue component data after filter processing, generating a final filter processing image through a reverse conversion process from HSV to RGB, and recording parameter configuration information in the processing process at the same time for rapid processing of subsequent similar images.

The invention discloses a PM2.5 bag filter with an intelligent cleaning function, and relates to the technical field of PM2.5 bag filters. Comprising a box body, an air inlet, a pulse device, an air outlet, a dust hopper, a bag filter assembly, a partition plate and a blowing pipe, deflection of a secondary filter assembly is utilized to synchronously drive a detection rod on a sliding frame to move in a detection shell, so that magnetic flux of two secondary coils is changed, an electric signal is generated, and a control system analyzes the magnitude of the electric signal; and the control system analyzes the dissipation amount of PM2.5 according to the deflection amount of the secondary filter disc, so that the aim of monitoring the filtering effect of the filter bag is fulfilled. When the filter bag is cleaned or replaced, meshes are large, and the filtering effect is reduced, escaping PM2.5 is intercepted and filtered through the second-stage filter disc. By utilizing the deflectability of the secondary filter discs, when a large amount of PM2.5 escapes, the impact force of the gas is converted into self deflection, the overlapping degree between the secondary filter discs is increased, and the filtering effect on the PM2.5 is adaptively increased.

The invention relates to a film and television filter lamp effect application method and device, equipment and a medium, and the method comprises the steps: obtaining a filter template correspondingly set based on film and television description information, the filter template being used for defining a filter effect applied by a film and television work corresponding to the film and television description information; configuring original lamp effect data of an atmosphere lamp according to the filter template, and obtaining filter lamp effect data applying a filter effect; and controlling an atmosphere lamp to play a corresponding atmosphere lamp effect according to the filter lamp effect data, so that the atmosphere lamp effect presents a filter effect. Through the technical means, the visual style of the movie and television can be copied in batches and presented in real time in an atmosphere lamp system in a low-cost and high-precision manner for the first time, so that immersive experience of the movie, namely the atmosphere, is really realized.

The utility model discloses a multi-cone separation pre-filter which comprises a filter bottle, the upper end of the filter bottle is connected with a valve head, one side of the valve head is provided with a water inlet, the other side of the valve head is provided with a water outlet, the lower end of the filter bottle is provided with a drain outlet, a ball valve is installed in the drain outlet, and a water segregator, a framework, a filter screen and a separation mechanism are installed in the filter bottle. The separation mechanism comprises an inner pipe part and an outer pipe part, an inner water cavity is formed between the inner pipe part and the outer pipe part, a plurality of conical funnels are arranged between the inner pipe part and the outer pipe part, and conical separation cavities are formed in the conical funnels. According to the multi-cone separation pre-filter disclosed by the utility model, the filter screen is combined with the multi-cone separator, double filter systems are perfectly fused, the filter effect is good, the flux is increased, the pollution discharge is clean and thorough, and the multi-cone separation pre-filter can adapt to different environmental water qualities.

The invention provides a noise reduction method and device, equipment and a medium, weighting processing is performed on a first time domain reference noise signal vector to obtain a second time domain reference noise signal vector, a sampling point closer to the current moment is endowed with a higher weight, the noise reduction performance is optimized, and the noise reduction performance is improved by updating a weight coefficient and the second time domain reference noise signal vector. Therefore, the noise cancellation signal is determined on the time domain, filtering on the time domain is realized, the noise cancellation signal is generated to carry out noise reduction processing on the primary noise in the target noise reduction area, extra time delay caused by frequency domain filtering is avoided, noise reduction time delay is reduced, and the filtering effect is improved. The updating process of the weight coefficient is completed in the frequency domain, updating is achieved in the frequency domain with smaller blocks, the calculation amount is reduced, the interval time of noise reduction processing is shortened, the calculation efficiency of the algorithm is improved, the processing delay is reduced, and the noise reduction effect is improved.

The invention relates to the technical field of wireless communication, in particular to a network security communication method and system applied to an unmanned equipment formation and a medium. The method comprises the following steps: firstly, according to a wind speed, a wind direction and a difference condition between an actual spatial position and a set spatial position of unmanned equipment, obtaining a self-noise representation degree at a to-be-analyzed moment; according to the noise interference degree, the initial smoothing coefficient of the to-be-analyzed moment is adjusted, and the adjusted smoothing coefficient of the unmanned equipment at the to-be-analyzed moment is obtained; filtering the actual spatial position by using the adjusted smoothing coefficient at each sampling moment to obtain filtered actual spatial position data; and performing communication transmission based on the filtered actual spatial position data. According to the method, the smoothing coefficient of each sampling moment is reasonably set, and exponential smoothing filtering is performed on the actual spatial position data of the unmanned equipment, so that the filtering effect is improved, the filtering data accuracy in wireless communication is improved, and the wireless communication safety is guaranteed.

The invention relates to the technical field of physiological signal processing, and discloses an anti-interference filtering method and system for a multi-modal physiological signal acquisition device, a terminal and a storage medium, and the method comprises the steps: carrying out the preprocessing of an acquired multi-modal physiological signal; modal recognition and feature extraction are carried out on the preprocessed multi-modal physiological signals; selecting a corresponding filter according to a modal identification result, and dynamically adjusting parameters of the filter; adjusting a filtering path and a filtering sequence based on a cascade filtering structure and a dynamic switching mechanism; adaptive interference estimation and offset are carried out based on crosstalk processing and a reference channel compensation mechanism; and performing parallel filtering according to the extracted features, comparing evaluation parameters of each filtering result based on an output result selection mechanism, and selecting and outputting a final signal according to a comparison result. According to the invention, effective suppression of multi-source interference such as power supply interference, motion artifacts, crosstalk and high-frequency noise is realized, and the real-time performance and stability of the filtering effect are improved.

The invention relates to the field of filtering equipment, in particular to a multi-channel needle type filtering device which comprises a workbench, an electric lifting rod is arranged at the upper end of the workbench, a needle cylinder frame is arranged at the top end of the electric lifting rod, a plurality of positioning cavity cylinders are arranged on the needle cylinder frame at equal intervals in a penetrating mode, and needle cylinder filters are erected in the positioning cavity cylinders. A plurality of mounting grooves are formed in the upper end of the workbench at equal intervals, container bottles are arranged in the mounting grooves and located under the corresponding needle cylinder filters, each needle cylinder filter comprises a needle cylinder body, a sealing seat and a needle head, a piston is slidably arranged in each needle cylinder body, a pressing column is fixedly arranged at the top end of each piston, and a connecting seat is arranged at the bottom of each needle cylinder body; and the sealing seat is hermetically sleeved on the outer side of the connecting seat. According to the ion filtering device, the corresponding filtering membranes can be quickly replaced according to different filtered ion particles, the filtering process of different ions can be synchronously realized on the same equipment, the operation is simple, and the filtering effect is good.

The utility model discloses a pre-filter and a water consumption system, and relates to the technical field of filters. Wherein the pre-filter comprises a valve head, a filter bottle, a filter assembly, an outer framework and an impeller assembly, the outer framework is rotatably arranged outside the filter assembly in a sleeving manner, and the impeller assembly comprises a mounting seat fixedly mounted in the water filtering cavity and an impeller body rotatably mounted on the mounting seat; the impeller body and the outer framework are coaxially connected and fixed in the circumferential direction, and the mounting base comprises a first water inlet formed in one axial side, a second water inlet formed in the circumferential side and a water outlet formed in the other axial side. The technical scheme provided by the utility model has the technical effects that the filtering effect of the filtering assembly is ensured, and the service life of the pre-filter is prolonged.

The utility model discloses anti-blocking water-based paint filtering equipment, which belongs to the technical field of filtering equipment and comprises a filtering box. The interior of the filter box is rotationally connected with a filter cartridge through a positioning ring, the surface of the filter cartridge is connected with a filter screen through a connecting frame, a flow guide groove is formed in the position, located at the bottom of the inner wall of the filter box, of the lower portion of the filter cartridge, and a discharging opening is formed in the bottom end of the flow guide groove; the fixing frame is mounted at one end of the filter box, and a driving motor for rotating the filter cartridge is mounted on the surface of the fixing frame; the assembling groove is formed in the end of the filtering box, a sealing baffle is detachably assembled in the assembling groove, and a feeding hopper is arranged on the surface of the sealing baffle; according to the paint filtering device, the filtering area can be effectively increased, the filtering effect can be improved, meanwhile, the filtering structure can be turned over, the situation of blockage during paint filtering is greatly reduced, and the workload of repeatedly replacing a filtering net by workers is reduced.

A single-station single-target flight path data particle filtering method based on a target position relates to the field of radar data processing, and comprises the following steps: sampling a flight path state of a flight target at 0 moment according to prior distribution to obtain a particle set of the flight path state at 0 moment, and predicting the particle set of the flight path state of the flight target at k moment to obtain a particle set of the flight path state of the flight target at k moment; obtaining a predicted value of the observation value of the flight target at the k moment; then tracking and measuring the flight target at the k moment through a radar to obtain an observed value of the flight path state of the flight target at the k moment, updating the weight of the particle set at the k moment, and finally processing flight path data measured by the radar through the steps of resampling, statistical output and iteration. According to the method, the distribution of the particle set can be updated by resampling according to the particle weight, the filtering effect is achieved, the observation error can be obviously reduced, the noise is further reduced, and the measurement tracking effect is improved.

The invention provides a high-power filter based on fractional order positive and negative inductor parallel connection and a control method, and the filter comprises a fractional order negative inductor # imgabs0 # and a positive inductor # imgabs1 # which are connected in parallel. The fractional order negative inductor # imgabs2 comprises a first switch tube V1, a second switch tube V2, a third switch tube V3, a fourth switch tube V4, filter inductors L1 and L2, a filter capacitor Cf, a filter damper Rf, a grounding capacitor Cg, a sampling resistor R, a DC-DC conversion circuit, a self-powered module, an MCU controller, a digital-to-analog converter AD and a sine pulse width modulation module SPWM. According to the scheme, the inductance value and the order of the fractional-order inductor can be changed at will by changing the parameters of the MCU controller, so that the inductance value of the high-power filter with the fractional-order positive and negative inductors connected in parallel is changed, and low cost, small size, high power density and flexible and adjustable order and inductance value of the filter inductor are realized; and the method can be applied to a high-power scene with relatively high harmonic content, and a better filtering effect is achieved.

The invention relates to the technical field of electromagnetic compatibility, in particular to a new energy automobile electronic part EMC (Electro Magnetic Compatibility) multi-dimensional simulation verification method, which comprises the following steps of: based on a geometric structure and material attributes of a new energy automobile electronic part, identifying an abnormal field intensity region, extracting a signal path and an electromagnetic wave incident direction, and analyzing an overlapping relationship between the signal path and the electromagnetic wave incident direction; according to the method, the electromagnetic field distribution and the interference source of the parts are accurately modeled and analyzed, the shielding and filtering design is optimized, the electromagnetic compatibility is improved, the interference coupling point is identified, the shielding effectiveness and the filtering effect are evaluated, the optimization policy is identified, the electromagnetic field distribution after optimization is analyzed, the fluctuation data of the external electromagnetic field is captured, and the influence evaluation list of the external electromagnetic field is generated. The reliability of the design under actual working conditions is ensured, electromagnetic interference is prevented, stable work of parts in a variable electromagnetic environment is ensured, the electromagnetic compatibility of the whole automobile is improved, the influence of electromagnetic interference on the functions of the new energy automobile is reduced, the design effect is optimized, and the performance and safety are improved.

The utility model relates to the technical field of cleaning, in particular to cleaning equipment which comprises a main shell and a cover plate device, and the cover plate device is movably mounted on the main shell so as to seal or open an opening of the main shell, so that a filter part can be loaded into or moved out of a containing cavity from the opening; the cover plate device comprises a cover plate and a display assembly, and the display assembly is installed on the side, away from the containing cavity in the first direction, of the cover plate. According to the display device, the display assembly is arranged outside the containing cavity, so that the containing cavity has a larger space for containing the filtering piece, the size of the filtering piece can be as large as possible, airflow exhausted to the outside from the containing cavity through the air outlet can be fully filtered by the filtering piece, and the filtering effect of the filtering piece is good; through the arrangement, a user can conveniently and clearly see the display assembly and know the current state of the cleaning equipment in time.

The invention discloses a broadband circularly polarized substrate integrated dielectric resonator filter antenna, which is characterized in that structures such as an annular back cavity structure, an equivalent metal wall and a rectangular short patch act on a 3 * 3 rectangular dielectric sheet to form an annular back cavity substrate integrated dielectric resonator working in multiple modes; by inhibiting a cross polarization electric field and optimizing a main polarization electric field by the three, the gain fluctuation is effectively improved, the axial ratio bandwidth is broadened, the broadband circularly-polarized substrate integrated dielectric resonator filter antenna with stable gain is realized by combining the filtering effect of the E-type microstrip feed structure, and the substrate can be integrated and can give consideration to the profile and the size.

The invention discloses an operation and maintenance method, device and equipment for filtering and separating equipment and a readable storage medium, belongs to the field of gas filtering, and aims to consider that related sensing data of a filter cartridge can reflect the residual life of the filter cartridge, so that a filter cartridge life prediction model is pre-trained, and then in the operation process of the filtering and separating equipment, the residual life of the filter cartridge is predicted. A real-time sensing data set (including at least one of temperature and humidity data of the filter cartridge, a pressure difference value of the surface of the filter cartridge, particle concentration of an inlet and an outlet of the filter cartridge and flow of the outlet of the filter cartridge) is obtained through a preset sensor group, and then the real-time sensing data set is input into a pre-trained filter cartridge service life prediction model to obtain a residual service life prediction value of the filter cartridge. And the prompter is controlled to prompt the residual life prediction value, so that the condition that the filter cartridge is poor in state and short in service life can be found in time and replaced in time, the filtering and separating equipment is prevented from running under the condition that the filter cartridge is poor in state, the filtering effect is guaranteed, and damage to rear-end equipment is avoided.

The utility model belongs to the technical field of ultrapure water treatment, and particularly relates to a maintenance device of a semiconductor water system, which comprises a collecting pipe and a filtering component arranged in the collecting pipe, the filtering assembly comprises a first connecting cover, a second connecting cover, a water storage barrel, a fluted disc and a gear, the outer side of one end of the collecting pipe is fixedly connected with the first connecting cover, the outer side of the other end of the collecting pipe is fixedly connected with a plurality of supporting legs, and the outer side of the end of the first connecting cover communicates with the second connecting cover. The filter element can be flexibly adjusted according to different water qualities through the forward and reverse rotation design of the filter element, and when the water quality is good, the forward rotation can accelerate the water flow velocity and improve the filtering efficiency; when the water quality is poor, the reverse rotation can provide resistance for the water flow, so that the retention time of the water in the filter element is prolonged, and a more sufficient filtering effect is ensured.

The utility model provides a system for collecting electroencephalogram signals, which relates to the technical field of electroencephalogram signal collection, and can improve signal range adaptability by arranging a preprocessing module at the front end of a filtering module, so that the signal can be better processed during filtering, and the filtering effect can be enhanced. According to the invention, offset or distortion caused by a direct current component in the filtering process is reduced, the calculated amount can be reduced, the filtering effect is improved, the response time is shortened, and the external power supply is detected in real time by arranging the power supply acquisition module. And the mains supply frequency is sent to the frequency adjustment unit to adjust the center frequency of the digital notch filter, so that the filtering module can better carry out notch filtering on the electroencephalogram signal when the mains supply frequency fluctuates, the influence of power grid fluctuation on the electroencephalogram signal is reduced, and the effect of improving the detection precision is achieved.

The invention discloses a filter control method and device and an anti-electromagnetic interference device, and relates to the technical field of electromagnetic compatibility. The method comprises the steps that output signals of a filter are obtained in real time, real-time frequency characteristics are determined based on the output signals of the filter, the real-time frequency characteristics comprise first characteristic values corresponding to multiple frequency points, target frequency characteristics are determined in a preset frequency characteristic set based on the real-time frequency characteristics, and the target frequency characteristics comprise first characteristic values corresponding to multiple frequency points. The preset frequency characteristic set comprises a theoretical frequency characteristic corresponding to at least one signal, and the theoretical frequency characteristic comprises second characteristic values corresponding to a plurality of frequency points of the signal under the condition of no electromagnetic interference; and adjusting the filter based on the second characteristic values corresponding to the plurality of frequency points in the target frequency characteristic and the first characteristic values corresponding to the plurality of frequency points in the real-time frequency characteristic. Under the condition that the target frequency band and the electromagnetic interference are unknown and change, the filter is controlled to perform active filtering, and the filtering effect is better.

The invention relates to the technical field of sealing performance detection, in particular to a pressure vessel-oriented leakage detection method, device and system, and the method comprises the steps: respectively obtaining the acoustic emission signals of each detection sensor on the outer wall surface of a pressure vessel and a guard sensor right above the detection sensor, and the liquid level height at each moment; judging the appearing acoustic emission event; obtaining each event set and a noise interference degree corresponding to the event set, and dividing the event sets into a noise event set and a non-noise event set; and determining a sound source estimation value and a liquid drop estimation value to obtain a modal decomposition layer number, performing signal reconstruction on all modal components corresponding to non-noise through modal decomposition, and positioning the leakage position of the pressure vessel. According to the method, the number of decomposition layers of the modal decomposition algorithm is dynamically adjusted, insufficient decomposition or excessive decomposition of the mode of the acoustic emission signal is avoided, the filtering effect on the acoustic emission signal is improved, and the leakage point of the pressure vessel can be positioned more accurately.

The invention relates to the technical field of reverse osmosis filtration, and discloses a reverse osmosis membrane filter element assembly and a use method thereof.The reverse osmosis membrane filter element assembly comprises two annular plates, a hollow cylinder is rotationally connected between the two annular plates, a motor is fixedly connected to the top of the upper annular plate, and the motor drives a large gear to rotate through a small gear on a first rotating shaft; the large gear drives the hollow cylinder to rotate, the hollow cylinder drives the first filter screen and the fixing plate to rotate when rotating, and the second filter screen slides in the sliding groove to extrude the spring to generate elastic force, so that the first filter screen and the second filter screen are staggered, the size of a filter screen opening is reduced, large particles in water are blocked in the first filter screen, and the filtering effect is achieved; when the hollow cylinder stops rotating, the filter screen II resets under the action of the elastic force of the spring, so that the filter screen openings are aligned, particles in the filter openings are thrown out under the action of inertia force, and filtered water flows into the next process through the water outlet, so that impurities are prevented from flowing out from the filter openings, and the filtering effect is improved.