72 results about "Constant waveform" patented technology

The invention discloses an exhaust valve self-adaptive noise reduction method based on environmental noise recognition, and belongs to the technical field of exhaust valve data noise reduction. The problem that noise reduction parameters of an exhaust valve cannot be automatically generated according to the actual environment noise condition at present, and then signals cannot be effectively processed is solved. The method comprises the following steps: acquiring a noisy exhaust valve audio signal, preprocessing and standardizing the signal, then sending the signal into a deep learning model for identification to obtain an environment category of a valve audio, and acquiring a binary mask corresponding to a prior environment category according to the environment category; performing short-time Fourier transform on the preprocessed audio to obtain a frequency amplitude spectrum Yn (f) and a phase phi n (f) of a signal; and performing point-by-point multiplication operation on the Yn (f) and a binary mask Mv (f) corresponding to an environment category to obtain a signal, and performing inverse STFT based on the phase phi n (f) to recover a time domain signal # imgabs0 # to synthesize a continuous waveform through an overlap-add method.

The invention relates to the technical field of continuous wave soldering, in particular to selective continuous wave soldering equipment based on electronic components, which comprises a base, a conveying unit, a soldering unit, a guide component and an auxiliary component. According to the welding device, firstly, the upper die base and the lower die base are closed and locked, a welding area is accurately opposite to the nozzle by means of the guide assembly, the welding quality and welding efficiency of follow-up welding are ensured, and batch rapid production is facilitated; the upper die base and the lower die base serve as first-stage covering protection, and the guide assembly limits the height of the nozzle; the tin solution is cooled before welding to form second-stage temperature protection, then third-stage protection is formed by means of nitrogen filling in in the welding process, fourth-stage protection is formed through preheating and cooling protection in the auxiliary assembly, in conclusion, through the four-stage temperature protection, the problem that components are damaged due to high temperature is solved, and the welding quality is improved.

The present invention specifically relates to a motor U-shaped flat wire continuous wave winding flexible forming equipment and forming method, the device includes: a grasping device, a rotary clamping cylinder, a linear bearing, an X-axis servo electric cylinder, a Y-axis servo electric cylinder and a forming die, and the above components are all fixedly connected to the workbench; the grasping device is placed on one side of the workbench; the rotary clamping cylinder and the X-axis servo electric cylinder are arranged opposite to each other, the output end of the rotary clamping cylinder is fixedly connected to the left dynamic clamp, the output end of the X-axis servo electric cylinder is fixedly connected to the slide, and the bottom of the slide is fixedly connected to the top of the linear bearing; the slide is provided with a right static clamp and a clamping cylinder, the output end of the clamping cylinder is provided with a right dynamic clamp, and the right static clamp and the right dynamic clamp are arranged opposite to each other; the Y-axis servo electric cylinder, the forming punch and the forming die are arranged between the rotary clamping cylinder and the slide, the forming punch is arranged at the output end of the Y-axis servo electric cylinder, and the forming punch and the forming die are arranged opposite to each other.

Methods, systems, and devices for wireless communication are described. A first wireless device may receive, from a second wireless device, a first frequency modulated continuous waveform (FMCW) signal via an orthogonal frequency division multiplexing (OFDM) channel. The first wireless device may generate a second FMCW signal based on a set of FMCW parameters associated with the first FMCW signal. The first wireless device may combine the first and second FMCW signals and filter the combined FMCW signal. The first wireless device may sample the combined and filtered FMCW signal in a time domain. The first wireless device may estimate the frequency domain OFDM channel based on sampling the combined and filtered FMCW signal. The first and second wireless devices may communicate OFDM signals via the OFDM channel based on the estimation of the frequency domain OFDM channel.

Continuous waveforms for driving a four-particle electrophoretic medium including four different types of particles, for example a set of scattering particles and three sets of subtractive particles. Methods for identifying a preferred waveform for a target color state or a target transition when using a continuous or quasi-continuous voltage driver / controller.

The present application provides a heat exchange apparatus and an air conditioning apparatus. The heat exchange apparatus comprises a heat exchange member and refrigerant pipes. The heat exchange member comprises a first flat portion, a second flat portion, and a first spacing portion. The first flat portion is provided with a plurality of through holes spaced apart in a first direction, and each refrigerant pipe penetrates through a through hole. The first flat portion and the second flat portion are respectively connected to two opposite sides of the first spacing portion in a second direction. The second flat portion and the first flat portion continuously extend in the first direction. The first spacing portion extends in a continuous wave shape in the first direction. The second direction intersects with both the axis of each through hole and the first direction. In this way, the defrosting efficiency of the heat exchange apparatus can be effectively improved.

The present application discloses an anti-false wave method for an ultrasonic flowmeter and an ultrasonic flowmeter. The method includes: setting an initial threshold; obtaining, according to the initial threshold, the peak value of the steady-state sine wave and the amplitudes of a plurality of consecutive waveforms that exceed the initial threshold and are before the steady-state sine wave from the first echo signal, including: the first wave and the adjacent waveforms after the first wave; calculating a first preset value according to the peak value of the steady-state sine wave of the first echo signal and the amplitudes of the plurality of waveforms; obtaining a second preset value of the second echo signal according to the initial threshold; obtaining a second threshold according to the ratio of the second preset value to the first preset value; obtaining the first wave of the third echo signal according to the second threshold. By calculating the ratio of the first preset value of the first echo signal to the second preset value of the second echo signal, and adjusting the initial threshold according to the ratio to obtain the second threshold, the logic is simple, which is conducive to real-time calculation, can avoid the influence of false waves, reduce the influence of interference on the measurement result, and improve the measurement accuracy.

The invention discloses a pressure balancing part for a continuous wave mud pulse generator, and relates to the technical field of underground drilling tool equipment. The device comprises an axially telescopic transmission shaft piece and an auxiliary transmission piece, the auxiliary transmission piece is fixed on a mounting sleeve of the pulse generator, a rotary valve of the pulse generator is connected to a telescopic shaft of the transmission shaft piece, and the telescopic shaft of the transmission shaft piece penetrates through the rotary valve to be connected with the auxiliary transmission piece. A rotary valve rotor of the rotary valve is fixedly connected with a telescopic shaft of the transmission shaft piece, and a rotary valve stator is rotationally connected with the rotary valve rotor; when the transmission shaft piece drives the rotary valve rotor to rotate relative to the rotary valve stator, the telescopic shaft drives the rotary valve to integrally move in the axial direction of the mounting sleeve under the connection matching of the telescopic shaft of the transmission shaft piece and the auxiliary transmission piece. In the slurry throughput change process of the rotary valve, the rotary valve is made to make adaptive movement along the rotating axis of the rotary valve through the cooperation effect of the transmission shaft piece capable of stretching and retracting in the axial direction and the auxiliary transmission piece, so that the pressure at the position of the rotary valve is dynamically balanced.

The present application relates to the technical field of power cable, in particular to a kind of cable installation device for overhead line based on tension self-balancing.The cable is externally provided with inner sheath, the outer surface of the inner sheath is provided with outer sheath, and the one end of the cable is provided with fixing mechanism, and the fixing mechanism is used to fix the cable on the telegraph pole.The present application is provided with a plurality of tooth protrusions which are uniformly distributed on the outer surface of the inner sheath, so that a continuous wave-shaped structure is formed between the tooth protrusions and the tooth groove, and a metal clamping strip is additionally provided to further enhance the surface strength of the inner sheath, and the locking teeth and the clamping block are cooperated with each other to uniformly disperse the stress at the clamping plate to the tooth groove and the metal clamping strip.Meanwhile, the inner sheath is synchronously locked by the locking plate and the second locking assembly, so that the stress distribution on the surface of the inner sheath is further dispersed, and the risk of fracture of the inner sheath is reduced.

The present invention discloses an artificial intelligence-based template matching earthquake detection method, and the steps include: extracting effective seismic phase data by using a deep learning detection model; using the effective seismic waveform as a machine-detected seismic waveform template; intercepting the artificial seismic monitoring waveform as an artificially-detected seismic waveform template; jointly building a template seismic waveform library; obtaining the template waveforms of each seismic phase; intercepting the continuous waveform data suspected of having an earthquake event as the continuous waveform to be detected, and performing matching calculations between the continuous waveform to be detected and the template waveforms of each seismic phase of each seismic waveform template in the template seismic waveform library. By performing matching calculations between the continuous waveform to be detected and the template waveforms of each seismic phase of each seismic waveform template in the template seismic waveform library, the template matching earthquake detection method can quickly and accurately identify and judge the continuous waveform to be detected, so as to quickly determine whether there is an earthquake event in the continuous waveform to be detected.

Techniques for wireless communication are disclosed. Aspects of the present disclosure relate to PC-FMCW based MIMO sensing operations. In an aspect, an NB phase code scrambling sequence may be associated with different MIMO antenna ports, where the FMCW for each MIMO antenna port is multiplied by the associated NB phase code scrambling sequence for that MIMO antenna port to produce a PC-FMCW. Then, as part of a MIMO sensing operation, each MIMO antenna port may transmit its respective PC-FMCW. Other aspects of the present disclosure relate to the communication of a MIMO sensing capability indication that can be used to determine a sensing configuration for MIMO sensing operations.

This invention discloses a seismic surface wave array tomography method, storage medium, and device, relating to the field of surface wave tomography technology. The method includes: calculating the cross-correlation function between all pairs of seismic stations based on continuous waveform data recorded by seismic stations; determining the size of the subarray based on the spacing and number of seismic stations; processing all cross-correlation functions within each subarray using a linear Radon transform to obtain the dispersion curve of each subarray; moving the subarray along both the horizontal and vertical directions with a certain step size, and using a linear Radon transform to obtain the dispersion curves of subarrays at other positions; using the dispersion curves of different subarrays as input data, and constructing the phase velocity values ​​of each grid point in the study area using the seismic array tomography method. The solution of this invention can improve the imaging resolution of seismic array processing technology.

The present invention provides a heart rate estimation method based on millimeter wave radar. The method comprises the following steps: sampling a human body by using a millimeter wave radar to obtain a plurality of frequency modulated continuous wave sweep signals; forming a distance-slow time matrix and locating the distance between the human body and the radar; extracting the human body phase by using an inverse tangent function, unfolding the phase whose phase change exceeds a set threshold by using a phase unwrapping function, obtaining the phase difference of adjacent frames, and smoothing the difference exceeding the threshold by using an interpolation method; removing the noise of the smoothed phase signal by using a wavelet transform, and obtaining a reconstructed phase signal; combining an EEMD-ICA method to separate a heartbeat signal, a respiratory signal, a respiratory harmonic and noise in the reconstructed phase signal, and obtaining a heartbeat waveform; constructing a spatial spectrum function by using a multi-signal classification algorithm, and estimating the heartbeat frequency by searching the spectrum peak; the method can accurately separate the heartbeat signal and greatly improve the accuracy of the heartbeat frequency estimation.

The application discloses a kind of continuous wave windings of axial motor, it is related to motor technical field, including annular stator core, stator core is equipped with several gaps along the axial direction;Several integrally formed windings, several windings are sequentially stacked along the axial direction, S-shaped curve is equipped on winding and gap is matched, adjacent winding is misaligned at gap, and several windings form the circulation of ladder shape;Structure gasket, structure gasket is located between adjacent winding;The radial straight-through cooling flow channel of the S-shaped winding integrally pressure casting formed with the axial ladder-shaped stacking structure, the electrical performance and heat management capability of the system optimization of axial flux motor winding forming process are realized by cooperation structure gasket construction;Pressure casting molding eliminates the bending work hardening and insulation layer damage risk of traditional flat wire winding, maintains the original crystal structure and electrical conductivity of copper material, while avoiding the uneven welding point resistance, high failure rate and low production efficiency and other problems caused by multi-section welding.

This application relates to a fault diagnosis method, system, device, and medium for vehicle communication networks. It involves acquiring continuous waveform data from the physical layer of the vehicle communication network, preprocessing the waveform data to obtain at least one protocol data unit (ARD) signal block of a preset length. Each ARDR signal block includes multiple logical bits, and each logical bit corresponds to K consecutive sampling points in the continuous waveform. K is determined by the protocol rate and physical layer sampling rate of the vehicle communication network. The ARDR signal block is then input into a trained neural network model. The neural network model includes a feature extraction layer, which uses a convolution kernel of size K and stride K to perform convolution operations on the input signal block. Based on the output of the neural network model, the fault diagnosis result of the vehicle communication network physical layer is determined. This significantly improves the identification accuracy and generalization ability of various faults caused by abnormalities in different bit positions.

The utility model relates to the technical field of air purification and disinfection, and provides a high-pressure high-energy tunnel particle sterilization mechanism and a device thereof, the high-pressure high-energy tunnel particle sterilization mechanism comprises an outer tubular column, an inner conductor and a fixing frame, the outer tubular column is internally provided with a channel for the inner conductor to pass through, the inner wall of the channel is provided with threads, the outer tubular column is vertically arranged on the fixing frame, and the outer tubular column is vertically arranged on the fixing frame. The inner electric conductor is a metal electric conductor with the outer side face in a continuous corrugated shape, the height of the inner electric conductor is the same as that of the outer tubular column, the inner electric conductor is located in the middle of the outer tubular column, and the lower end of the inner electric conductor is vertically and fixedly arranged on the fixing frame. A high-pressure high-energy particle release ring is formed by the outer tubular column and the inner electric conductor, so that a high-energy particle tunnel body is formed between the outer tubular column and the inner electric conductor, particles in the tunnel body are impacted and ionized, bacteria, viruses and particles passing through the tunnel body are impacted and ionized, original structures are damaged, and the bacteria, the viruses and the particles die instantly. The disinfection and sterilization effects are achieved.

This invention discloses a biomimetic blade, impeller, and fan with a wave-like surface structure. The blade features a continuous wave structure along its chord length. The wave structure includes a first wave structure, a gentler wave structure, and a second wave structure arranged sequentially along the chord length. This invention targets a closed axial flow impeller, employing a wave-like biomimetic design on the blade surface. The wave pattern is primarily concentrated from 50% of the blade height to the blade tip, aiming to reduce noise from the blade tip to 50% of the blade height. During operation, the area with the highest sound pressure level is concentrated above 50% of the blade height to the blade tip, with the highest sound pressure level near the blade tip. The wave-like design at this location effectively improves the area of ​​airflow energy dissipation and accumulation, thereby reducing noise.

The present invention discloses a method for identifying repeating earthquakes based on single-station seismic observation data, belonging to the technical field of repeating earthquake identification, including: obtaining template earthquakes, stations and continuous waveform data; calculating multi-segment cross-correlation coefficients using the multi-segment cross-correlation method to screen potential repeating earthquake events; calculating the magnitude difference between the template earthquake event and the potential repeating earthquake events, and screening out the potential repeating earthquake events with a small magnitude difference from the template earthquake event; calculating the source rupture area radius of the template earthquake event and the potential repeating earthquake events using the assumed stress drop value; estimating the source distance using the PS travel-time difference of the repeating earthquake event pair to the same station, and calculating the source distance; calculating the overlap degree of the source rupture area using the source distance and screening repeating earthquakes. By adopting the above method, the present invention combines the waveform similarity judgment method and the physical judgment method at the same time under the condition that only single-station seismic observation data is available, improving the reliability and accuracy of repeating earthquake identification.

The invention relates to the technical field of power cables, in particular to a cable mounting device for an overhead line based on tension self-balancing. The cable comprises a cable body, an inner sheath is arranged outside the cable body, an outer sheath is arranged outside the inner sheath, a fixing mechanism is arranged at one end of the cable body, and the fixing mechanism is used for fixing the cable body to a telegraph pole. According to the device, the first tooth protruding blocks which are evenly distributed are arranged outside the inner sheath, a continuous wave-shaped structure is formed between the first tooth protruding blocks and the tooth grooves, the metal clamping strips are additionally arranged, the surface strength of the inner sheath is further enhanced, the inner sheath is matched with the locking teeth and the clamping blocks, and the service life of the inner sheath is prolonged. The stress at the clamping plate is uniformly dispersed into the tooth groove and the metal clamping strip, and meanwhile, the inner sheath is synchronously locked through the locking plate and the second locking assembly, so that the stress distribution on the surface of the inner sheath is further dispersed, and the risk of breakage of the inner sheath is reduced.

A system includes a controller configured to reconstruct a continuous waveform into a discrete analog version. The system includes a numerical optimizer configured to determine the frequency of a pulse sequence. The numerical optimizer uses radial motion mode frequencies and desired gate times. The numerical optimizer generates the pulse sequence by disabling phase space trajectories, unwrapping spins and motion, and limiting the Rabi frequencies of motion sideband transitions. The system also includes a display configured to illustrate the discrete-frequency modulated pulse sequence based on the determined frequencies.

The utility model provides a front and back universal leveling machine. The utility model discloses a front and back universal leveling machine which comprises a rack, a lower roller assembly, an upper roller assembly, a feeding assembly and an adjusting assembly. Wherein the rack is fixedly arranged on the horizontal ground; the lower roller assembly is arranged at the bottom of the rack and is connected with driving equipment; the upper roller assembly is slidably arranged on the rack in the vertical direction and located above the lower roller assembly, and a continuous wavy roller gap with the variable width is formed by the upper roller assembly and the lower roller assembly. The feeding assembly is arranged on the rack in a sliding mode in the vertical direction and can be connected with the lower roller assembly. The adjusting assembly is arranged on the machine frame in a sliding mode in the vertical direction and can be adjusted to the position with the height equal to that of the upper roller assembly. The front and back universal leveling machine can adapt to plates in different uncoiling modes, and has the advantages of being thorough in stress eliminating effect and good in leveling effect.

The invention relates to a stator winding preparation method, a stator winding, a stator assembly and a permanent magnet motor. The stator winding preparation method comprises the steps that 18 conductors used for winding 9 winding branches of three phases are sequentially laid and wound in a wave winding mode; during tiled winding, the two effective parts of the wave winding pattern of the same-layer overline formed by wave winding of any conductor are arranged on the same layer, and the two effective parts of the wave winding pattern of the two adjacent groove layers are arranged in an up-and-down staggered layer manner; the 18 conductors which are laid and wound are coiled from one ends of the conductors to the other ends of the conductors; during coiling, the coiling direction of the 18 conductors is the direction in which the serial number of the conductor grooves is reduced, and the radial outer sides of the 18 conductors are the sides where the groove layers with the serial number of 1 of the conductor grooves are located. Through the specified coiling process, the problem that the NVH performance of the odd-number-layer stator winding of the continuous wave winding of the permanent magnet motor is poor due to the improper preparation method can be solved.

The utility model relates to the technical field of impellers, in particular to an impeller structure capable of improving pump performance and reducing loss, the flow characteristic of fluid on blades is changed through continuous wave-shaped grooves in the blades, the conversion efficiency of kinetic energy is improved, the continuous wave-shaped grooves can guide the fluid to an optimal flow path, flow separation and vortex generation are reduced, and the service life of the impeller structure is prolonged. The noise vibration of the water pump can be reduced, and the practicability of the device is improved; comprising a lower cover, blades, an upper cover and continuous wave-shaped grooves, the blades are arranged on the lower cover, the continuous wave-shaped grooves are formed in the side faces of the blades, and the upper cover is connected with the lower cover in a matched mode.

The invention discloses a template matching seismic detection method based on artificial intelligence. The method comprises the following steps: extracting effective seismic phase data by using a deep learning detection model; taking the effective seismic waveform as a machine detection seismic waveform template; intercepting an artificial seismic monitoring waveform as an artificial detection seismic waveform template; co-building a template seismic waveform library; obtaining a template waveform of each seismic phase; and intercepting a to-be-detected continuous waveform with a suspected seismic event from the continuous waveform data, and carrying out matching calculation on the to-be-detected continuous waveform and a template waveform of each seismic phase of each seismic waveform template in a template seismic waveform library. According to the template matching seismic detection method, the to-be-detected continuous waveform and the template waveform of each seismic phase of each seismic waveform template in the template seismic waveform library are matched and calculated, so that the to-be-detected continuous waveform can be quickly and accurately identified and judged, and whether a seismic event exists in the to-be-detected continuous waveform or not can be quickly judged.

The invention relates to the technical field of Beidou signal analysis, in particular to a Beidou anti-interference calibration method and system based on an array antenna, and the method comprises the steps: employing a uniform linear array antenna with M array elements as a receiving array in a Beidou positioning system, and transmitting a predefined beacon signal through an external transmitter with a known position; receiving a beacon signal and a direct path reference signal forwarded by at least one forwarding device independent of Beidou, the beacon signal and the reference signal having the same carrier frequency or channel, and the waveform of the beacon signal being a constant waveform, a cosine waveform or a spread spectrum waveform; after the composite signal is received, spectrum analysis is carried out, a power peak value is searched in a spectrum neighborhood of the beacon signal to determine frequency deviation, and frequency compensation is applied to enable the frequency deviation to approach zero; extracting beacon signal features from the composite signal after frequency compensation, and estimating an amplitude error and a phase error of each array element; the delays of array elements are calculated during estimation, the delays comprise theoretical delays and any additional delays, and the theoretical delays are obtained through accumulation calculation according to incident angles of beacons; and performing amplitude and phase compensation on the composite signal of each array element, correcting amplitude and phase errors, and obtaining a calibrated antenna array signal. According to the invention, the problems of signal frequency deviation, amplitude error and phase error of the Beidou system in a complex interference environment are solved.

The invention relates to the field of petroleum drilling equipment, in particular to a high-speed continuous wave pulser for petroleum drilling, which comprises a pulse generating device shell sleeve, a transmission shaft, a rotor valve plate and a stator valve plate, the transmission shaft, the rotor valve plate and the stator valve plate are mounted on the inner side of the pulse generating device shell sleeve, and a first slurry passing hole and a second slurry passing hole are correspondingly formed in the rotor valve plate and the stator valve plate respectively. The rotor valve plate and the transmission shaft are coaxially fixed, the stator valve plate is fixed to the inner wall of the pulse generating device shell sleeve, and the stator valve plate is located on the side, away from the slurry output direction, of the rotor valve plate and is in sliding fit with the rotor valve plate; a valve type filtering structure used for filtering sand particles is arranged on the side, away from the rotor valve plate, of the stator valve plate. Compared with an existing high-speed continuous wave pulser for petroleum drilling, the high-speed continuous wave pulser has the advantages of being capable of preventing gravel particles with large particle sizes in slurry from abrading the edge of a valve hole of a rotary valve, and therefore the service life of the rotary valve is prolonged.

The invention relates to a preparation method of a stator winding, the stator winding, a stator assembly and an induction motor. The method comprises the following steps of: flatly winding conductors for winding 6m branch units of three phases in sequence in a wave winding manner; during tiled winding, two effective parts of any wave winding pattern formed by wave winding of any conductor are arranged in an up-and-down staggered layer manner, and the effective parts of the wave winding patterns in different cross-layer manners are arranged in a staggered layer manner; the 6m conductors which are laid and wound are coiled from one ends of the conductors in a circular ring shape, and the 6m conductors are coiled for n / 2 circles to the other ends of the conductors; during coiling, the coiling direction of the 6m conductors is the direction in which the serial number of the conductor slots is increased, and the radial outer side of the 6m conductors is the side where the slot layer with the serial number of 1 of the conductor slots is located. According to the invention, through the specified coiling process, the problem that the inductance unbalance amount of the continuous wave winding stator winding of the induction motor is relatively large due to an improper preparation method can be improved.

A hollow conductor (200) forming a continuous wave winding (210) of a stator (120). The stator (120) and a rotor (110) are forming an electrical machine (100). The wave winding (210) is formed by distribution of the conductor (200) around the stator periphery in a winding pattern between axial endings (301, 302) of the winding (210). A first axial ending (301) is flooded by cooling fluid in a first cooling cavity (510) and a second axial ending (302) is flooded by cooling fluid in second cooling cavity (520). The first axial ending (301) comprises a first set of holes (310) and the second axial ending (302) comprises a second set of holes (320), thereby allowing cooling fluid to flow from the first cooling cavity (510), via the first set of holes (310), through a respective section of the hollow conductor (210), to the second cooling cavity (520).

The invention relates to the technical field of foundation pit supporting, and discloses a geogrid for foundation pit supporting and a construction method.The geogrid comprises a grid body which is provided with a first surface and a second surface which are opposite; the geomembrane is arranged on the first surface of the grille body; the reinforcing parts are arranged on the second surface of the grille body, and continuous wave crests and wave troughs are formed on the end faces, away from the grille body, of the reinforcing parts; a plurality of anchor rods are constructed in a foundation pit, a plurality of geogrids are hung on the plurality of anchor rods, and the plurality of geogrids are sequentially overlapped through wave crests and wave troughs, so that the problems of stress concentration, poor combinability with a soil body, complex construction, insufficient durability and the like in a traditional supporting scheme are solved; therefore, the stability and the deformation resistance of the support are improved.