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33results about How to "Method algorithm is simple" patented technology

Method for identifying pushing action based on two-dimensional planar camera and system

The invention discloses a method for identifying pushing action based on a two-dimensional planar camera and a system. The method includes acquiring video images containing persons, and dividing hand detecting areas; realizing binarization processing for divided hands, and acquiring corresponding contours of the hands; comparing the contours of a divided current hand with a standard hand contour set in advance, and judging whether push action of the hand is performed; determining that the pushing action of the hand is performed when contour similarity is larger than a set threshold value T, extracting the hand area of the hand performing the pushing action, extracting the center of the minimum rectangle surrounding the contour of the hand, and creating a historical movement graph; and identifying the pushing action of the hand for the built historical movement graph by the aid of orientation gradient vectors. The method is simple in algorithm and high in action identification rate, and simultaneously burden on users in terms of memory is reduced.
Owner:TCL CORPORATION

Community micro-grid energy storage capacity optimization and configuration method considering temperature control device

The present invention discloses a community micro-grid energy storage capacity optimization and configuration method considering a temperature control device. The method comprises a first step of collecting statistics about an annual load of a community level micro-grid, air speed data, environment and temperature data and parameters of all micro power supplies, and calculating an output power of a wind turbine; a second step of making a running policy of a community level single micro-grid to increase new energy consumption; a third step of establishing, based on the running policy, a community level micro-grid energy storage capacity optimization and configuration model including the temperature control device; and a fourth step of according to the data of the first step, using a genetic algorithm to resolve the optimization and configuration model. The method has the beneficial effects that the established model is more comprehensive, the considered factors are more consistent with demands of the actual micro-grid plane including the temperature control device, the algorithm is simple and can be learned and used by engineering staff easily, and the method is universal and can be widely used in temperature control device included micro-grid energy storage device capacity plane and analysis.
Owner:CHONGQING UNIV

Permanent magnet motor square wave injection position sensorless control method based on oversampling

According to a permanent magnet motor square wave injection position sensorless control method based on oversampling, a high-frequency square wave signal is injected into a de axis, and rotor positioninformation is obtained through PLL according to the relation between high-frequency response current in a winding and a rotor position angle theta e. The period of a position angle is shortened, thespeed of updating the position angle is higher, and the current change at the two ends of the effective vector is in linear change, so that when the position angle is calculated, the model is more accurate, and the obtained position angle is more accurate. The method is simple in algorithm, free of a filter in the implementation process and easy to implement, the accuracy of motor rotor positiondetection can be effectively improved, the initial position information of the rotor can be accurately detected, and the system response frequency is improved. When the rotating speed is high, the calculation precision of the rotor position is higher, the speed range of the motor under the condition of no position sensor operation is improved, and the rotating speed range is broadened. When a large load is suddenly added, the rotating speed fluctuation is smaller, and the dynamic performance of the system is improved.
Owner:TIANJIN POLYTECHNIC UNIV

Real-time detection method of initial position of human sound in song

ActiveCN109545191AGood judgment error toleranceSimple algorithmSpeech recognitionFrequency domainSound detection
The invention belongs to the technical field of digital audio processing, and relates to human sound detection problems, in particular to an estimating method of the initial position of the human sound in a song. The method comprises the steps that an audio is framed by using a high overlapping long window, the dynamic characteristics of two dimensions including inter-frequency (a frequency domain) and inter-frame (a time domain) are extracted, and the audio characteristics in the initial sound production stage are effectively captured. Through learning of a starting-point fragment of the song, the song is divided into musical instrument sound and human sound or musical instrument and human mixed sound, the initial position of the human sound can be accurately estimated, and the method ishigh in human sound / musical instrument sound determining fault tolerance. The method is simple in algorithm, high in processing speed, capable of being widely used in transmission of programs in broadcasting station, automatic digital media management and the like.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA

Method for automatically adjusting ACK timeout time

The invention discloses a method for automatically adjusting ACK timeout time and belongs to the technical field of wireless communication. The method includes the following steps: A, initializing the ACK timeout time and adjusting step length; B, utilizing a step length algorithm to determine optimal ACK timeout time in the process of convergence of the adjusting step length; C, after certain time, re-performing value assignment on the adjusting step length, executing step B, determining new optimal ACK timeout time, calculating a difference value between the new optimal ACK timeout time and the original optimal ACK timeout time, if the difference value is larger than a threshold value, quickly performing next-time ACK timeout time adjusting, and if the difference value is smaller than the threshold value, prolonging adjustment waiting time of next-time adjusting. The method is less influenced by reflection of radio waves and multipath effect in a communication environment and is high in estimating and adjusting accuracy of the ACK timeout time, low cost, small resource occupancy and high stability are realized, convergence can be realized quickly, manual setting is not needed, and operation is simple and convenient.
Owner:江苏创通电子股份有限公司

Robust fixed-frequency type model prediction control method for active front-end rectifier

The invention discloses a robust fixed-frequency type model prediction control method for an active front-end rectifier. The technical scheme adopted by the invention comprises the key points that according to the robust fixed-frequency type model prediction control method for the active front-end rectifier, when a model parameter of a controlled object is not matched with an actual parameter, the difference between an actual current and a predicted current is calculated and a prediction model is subjected to compensation in real time so as to improve the model prediction accuracy and obtain accurate action time of each vector; and the action time of each vector is processed by a modulator to obtain a switching signal for controlling a power device. The robust fixed-frequency type model prediction control method for the active front-end rectifier, which is disclosed by the invention, can eliminate the influence of the mismatching of the model parameter on a control system, strengthens the robustness of the model prediction control system and implements the stabile operation of the active front-end rectifier under the condition that the prediction model has a large error.
Owner:HENAN NORMAL UNIV

Transient parameter automatic calculating method of generating set waveform recorder

The invention belongs to the technical field of a generating set, and specifically relates to a transient parameter automatic calculating method of a generating set waveform recorder. The transient parameter automatic calculating method of a generating set waveform recorder includes the steps: calculating the transient regulate rate and stabilization time, and the transient voltage change rate and stabilization time of a generating set; combining with rated parameters of the generating set, according to the alternating-current voltage transient waveform curve acquired by a generating set waveform recorder, automatically and accurately drawing the peak value envelope curve of the alternating-current voltage signal; according to the drawn peak value envelope curve or the rotating speed transient waveform curve, accurately capturing the transient value and the corresponding time when the transient change occurs in the waveform, and when the transient change occurs in extremum and when stable operation is recovered; and combining with the rated parameters of the generating set, automatically calculating the transient parameters of the generating set, such as the transient regulate rate and stabilization time, and the transient voltage change rate and stabilization time. When a test person performs a generating set transient parameter test, only the rated parameters of the generating set are given, thus greatly reducing the work load of the test person.
Owner:中国船舶重工集团公司第七〇三研究所

Method for watermarking robust audios with invariable time scale based on zero-crossing rate

The invention discloses a method for watermarking robust audios with invariable time scale based on zero-crossing rates, which comprises the following steps: firstly, dividing an original audio signal A into a plurality of nonoverlapping audio frames; secondly, calculating the zero-crossing rate of each audio frame, and selecting M1 audio frames with larger zero-crossing rates for embedding watermarks according to a preset threshold value T; thirdly, dividing each one of the M1 audio frames into a plurality of nonoverlapping audio segments of which the number is accordant with the total bit number of the watermarks to be embedded, quantizing the average value of nonoverlapping audio segment samples so as to embed watermark bits, and modifying sample values which correspond to each audio segment so as to obtain the audio segments containing the watermarks; and finally, interconnecting the audio segments containing the watermarks to obtain audio frames containing the watermarks so as to form the final audios with the watermarks. The method has a simple algorithm, is applicable to all types of audio signals, and not only can effectively resist attacks of conventional signal processing, but also has strong robustness for time scale modifications in a resampling form.
Owner:SOUTHWEST JIAOTONG UNIV

Power grid voltage and current harmonic analysis method and system

The invention discloses a power grid voltage and current harmonic analysis method and system. An AD converter samples an input voltage signal; a secondary virtual sampling unit is used for carrying out secondary sampling on first sampling data in a virtual sampling period s; a spectrum analysis unit analyzes the data by using an FFT algorithm to obtain the spectrum of the voltage signal; a spectrum leakage estimation unit scans and accumulates all spectral lines except the power frequency signals and harmonic waves thereof in the spectrum to obtain total energy leakage d of the spectrum; and avirtual sampling period adjustment unit adjusts the virtual sampling period s according to the spectrum leakage. According to the invention, a simple fixed hardware circuit is utilized to realize self adaption to frequency drift of the power frequency signals, so that the minimum spectrum leakage of an analysis result is ensured.
Owner:JIANGSU UNIV

Aero-engine front support intersecting line welding seam recognition method based on laser vision

The invention discloses an aero-engine front support intersecting line welding seam recognition method based on laser vision which can be applied to intersecting line welding of a front support cylinder wall and a connecting tube. An image is collected through an annular laser vision sensor, the deflection degree and the section center of the tube are recognized through image segmentation, and theinclination angle is calculated. A servo rotary disc is adjusted to enable the turnover face of a positioning rod to be parallel to the front projection face of the connecting tube, a turnover mechanism is adjusted to enable the positioning rod to be parallel to the connecting tube, the positioning rod is moved to be located over the connecting tube, and the telescopic mechanism extends the positioning rod to be centered with the connecting tube. The annular vision sensor scans a welding seam groove, fitting and smoothing treatments are conducted on a scanning signal, and an intersecting linewelding seam is obtained. The method is simple in algorithm, capable of rapidly and accurately identifying the connecting tube inclination angle and the welding seam position, few in inclination angle adjusting step of a welding gun positioning rod, small in welding error and high in efficiency.
Owner:XIANGTAN UNIV

Nonlinear networked system filter under multipath fading channel and design method

A method for designing a nonlinear networked system filter under a multipath fading channel comprises steps of establishing a discrete T-S fuzzy nonlinear model based on the analysis of a nonlinear networked system; establishing an L-order Rice fading model to describe the multipath fading phenomenon of a wireless communication channel; and constructing a non-fragile H[infinite] filter.
Owner:SHANGHAI OCEAN UNIV

Respiration rate monitoring method and device based on multispectral PPG blind source separation method

The invention relates to a respiration rate monitoring method and device based on a multispectral PPG blind source separation method. The respiration rate monitoring method comprises the following steps that PPG signals at least comprising two wave bands of an individual are synchronously collected; respiratory signals are extracted from the PPG signals containing at least two wave bands through a multi-channel fusion method, and the multi-channel fusion method specifically adopts a blind source separation algorithm; and a respiratory rate is calculated based on the respiratory signals extracted from the multispectral PPG signal by a blind source separation method. The device is provided with a module for executing the method. According to the respiration rate monitoring method, breathing components are separated from the multispectral PPG signals, namely, the breathing components and noise components in the multispectral PPG signals are separated by using PPG signals of at least two wave bands as input through the blind source separation algorithm, then the breathing frequency is calculated by selecting the separated breathing components, so that the robustness and the stability of breathing signal extraction can be enhanced, and the purpose of stable, accurate and continuous monitoring is achieved.
Owner:ZHONGSHAN HOSPITAL FUDAN UNIV

Method for watermarking robust audios with invariable time scale based on zero-crossing rate

InactiveCN101521011BMethod algorithm is simpleResistance to conventional signal processing attacksSpeech analysisRecord information storageAudio watermarkZero-crossing rate
The present invention discloses a method for watermarking robust audios with invariable time scale based on zero-crossing rates, which comprises the following steps: firstly, dividing an original audio signal A into a plurality of nonoverlapping audio frames; secondly, calculating the zero-crossing rate of each audio frame, and selecting M1 audio frames with larger zero-crossing rates for embedding watermarks according to a preset threshold value T; thirdly, dividing each one of the M1 audio frames into a plurality of nonoverlapping audio segments of which the number is accordant with the total bit number of the watermarks to be embedded, quantizing the average value of nonoverlapping audio segment samples so as to embed watermark bits, and modifying sample values which correspond to each audio segment of the watermarks to be embedded, quantizing the average value of nonoverlapping audio segment samples so as to embed watermark bits; and finally, interconnecting the audio segments containing the watermarks to obtain audio frames containing the watermarks so as to form the final audios with the watermarks. The method has a simple algorithm, is applicable to all types of audio signals, and not only can effectively resist attacks of conventional signal processing, but also has strong robustness for time scale modifications in a resampling form., but also has strong robustness for time scale modifications in a resampling form.
Owner:SOUTHWEST JIAOTONG UNIV

An Automatic Calculation Method of Transient Parameters of Generating Set Waveform Recorder

The invention belongs to the technical field of a generating set, and specifically relates to a transient parameter automatic calculating method of a generating set waveform recorder. The transient parameter automatic calculating method of a generating set waveform recorder includes the steps: calculating the transient regulate rate and stabilization time, and the transient voltage change rate and stabilization time of a generating set; combining with rated parameters of the generating set, according to the alternating-current voltage transient waveform curve acquired by a generating set waveform recorder, automatically and accurately drawing the peak value envelope curve of the alternating-current voltage signal; according to the drawn peak value envelope curve or the rotating speed transient waveform curve, accurately capturing the transient value and the corresponding time when the transient change occurs in the waveform, and when the transient change occurs in extremum and when stable operation is recovered; and combining with the rated parameters of the generating set, automatically calculating the transient parameters of the generating set, such as the transient regulate rate and stabilization time, and the transient voltage change rate and stabilization time. When a test person performs a generating set transient parameter test, only the rated parameters of the generating set are given, thus greatly reducing the work load of the test person.
Owner:中国船舶重工集团公司第七〇三研究所

Optimal allocation method of community microgrid energy storage capacity considering temperature control equipment

The present invention discloses a community micro-grid energy storage capacity optimization and configuration method considering a temperature control device. The method comprises a first step of collecting statistics about an annual load of a community level micro-grid, air speed data, environment and temperature data and parameters of all micro power supplies, and calculating an output power of a wind turbine; a second step of making a running policy of a community level single micro-grid to increase new energy consumption; a third step of establishing, based on the running policy, a community level micro-grid energy storage capacity optimization and configuration model including the temperature control device; and a fourth step of according to the data of the first step, using a genetic algorithm to resolve the optimization and configuration model. The method has the beneficial effects that the established model is more comprehensive, the considered factors are more consistent with demands of the actual micro-grid plane including the temperature control device, the algorithm is simple and can be learned and used by engineering staff easily, and the method is universal and can be widely used in temperature control device included micro-grid energy storage device capacity plane and analysis.
Owner:CHONGQING UNIV

Satellite timing and management network based micro power grid islanding detection method and system

InactiveCN103728522AReduce the impactEliminate factors for detection failureElectrical testingPower qualityMicrogrid
The invention provides a satellite timing and management network based micro power grid islanding detection system. The satellite timing and management network based micro power grid islanding detection system comprises a central controller; the central controller is used for obtaining pulse per second signals through satellite timing and collecting voltage signals from a common connection point between a large power grid and a micro power grid, wherein the pulse per second signals and the international standard time maintain synchronization; the central controller is communicated with a grid connected inverter control unit. According to the satellite timing and management network based micro power grid islanding detection method and system, the periodic disturbance on the output current of a grid connected inverter does not need to be performed at any time, the grid connected inverter is only informed that output power factors change through the micro power grid management network when the change of a relative phase of the voltage forward direction zero crossing point of the common connection point is large and the islanding is deduced, and accordingly a user can further confirm whether the islanding really occurs or not and accordingly the effect on the power quality of the islanding detection by the satellite timing and management network based micro power grid islanding method is small.
Owner:WUHAN UNIV OF TECH

Object three-dimensional reconstruction method and system

The invention provides an object three-dimensional reconstruction method and system, and the method comprises the steps: enabling a processor to receive original three-dimensional point cloud data, and determining whether a first point cloud point corresponding to the first point cloud data is in an interested region corresponding to preset interested region data according to the first point clouddata and the preset interested region data; when the first point cloud point is in the region of interest, storing the first point cloud data in the three-dimensional point cloud data of the object;when the first point cloud point is not in the region of interest, determining first mirror surface equation data, performing reflection transformation processing according to the first point cloud data and the first mirror surface equation data to obtain first reflection point cloud data, and when it is determined that the first reflection point cloud point is in the region of interest, generating second reflection point cloud data; and when the first reflection point cloud data, the second reflection point cloud data and the camera center position data determine that the first reflection point cloud data are reliable point cloud data, storing the first reflection point cloud data in the object three-dimensional point cloud data.
Owner:北京深测科技有限公司

Battery module capacity estimation method

The invention discloses a method for estimating the capacity of a battery module. The method comprises the following steps: acquiring a charging cut-off temperature of each single battery in a battery module at a respective charging cut-off moment; obtaining a theoretical capacity value and an actual SOC value of each single battery at the respective charging cut-off temperature; and calculating the chargeable electric quantity and dischargeable electric quantity of each single battery according to the theoretical capacity value and the actual SOC value of each single battery at the respective charging cut-off time temperature so as to obtain the capacity of the battery module. According to the method provided by the invention, the discharge capacity of the module can be estimated according to the voltage of each single battery and the capacity of the single batteries forming the module when the battery module is assembled without charging and discharging the module, so that the time for obtaining the capacity of the module is greatly shortened, the efficiency is improved, the purchase cost of charging and discharging equipment of a production line is saved, additional hardware setting is not needed, and the cost is reduced. The cost is low.
Owner:TIANJIN ENERGIES

Distinguishing method of sectors of voltage vectors based on SVPWM (Space Vector Pulse Width Modulation) algorithm

The invention discloses a distinguishing method of sectors of voltage vectors based on an SVPWM (Space Vector Pulse Width Modulation) algorithm. The method comprises the steps of 1, converting three-phase voltage ua, ub and uc from a three-phase a, b and c coordinate system into a two-phase alpha and beta coordinate system in the SVPWM algorithm to obtain voltage values u alpha and u beta on an alpha axis and a beta axis to obtain voltage phase information as shown in the specification, 2, obtaining phase information of the voltage vectors, dividing the sectors of the voltage vectors, presenting the sectors in a voltage vector phase sine value and a voltage vector phase cosine value, and calculating a phase value sin theta expressed by voltage vector sine and a phase value cos theta expressed by voltage vector cosine: setting an equation as shown in the specification according to the voltage values u alpha and u beta obtained in Step 1 to obtain the phase value sin theta expressed by the voltage vector sine to be u alpha / m and the phase value cos theta expressed by the voltage vector cosine to be u beta / m, and 3, determining the corresponding sectors of the voltage vectors by consulting a voltage vector sector dividing table according to calculated sin theta and cos theta in Step 2.
Owner:泰州学院

Positioning method and device based on capon beamforming

The invention provides a Capon beamforming-based positioning method and device. According to the Capon beamforming-based positioning method and device, K receiving antennas are set to form a signal receiving array, and M signal transmitting points are set; a covariance matrix Rxx is calculated by using a signal matrix outputted by the signal receiving array; the constraint optimization problem of the linearly constraint minimum variance criterion is solved, so that a spectral function can be constructed; M maximum spectral peaks are searched; and a direction of arrival is calculated. According to the method, beacon points deployed in a monitoring area are adopted to be networked with a wireless gateway so as to communicate with the wireless gateway; data are transmitted to a cloud end through a wireless communication module; cooperative sensing is performed, and the information of signal transmitting points in a network coverage area is acquired and positioned; the monitoring data of the cloud end are matched with a map and the like, so that intelligent parking can be realized. With the method adopted, the number of vehicles does not need to be known in advance or estimated, and therefore sampling data length can be decreased; desired signals are enhanced, interference is suppressed, and therefore, the signal to interference plus noise ratio of the output of a system can be improved; and a robust Capon algorithm is modified to improve the deviation of a direction vector from an actual environment, and therefore, positioning performance can be improved.
Owner:NANJING INST OF TECH

Method for monitoring position and movement path of field robot

The invention belongs to the field of image processing, and particularly relates to a method for monitoring the position and the movement path of a field robot. The method mainly comprises the following steps: 1) identifying the number identity of each field robot; 2) calibrating a shooting height and a shooting posture of a shooting device; 3) identifying an image shot by the shooting device andcarrying out distortion correction; and 4) selecting an original point to establish a coordinate system, identifying the position of the field robot according to the number identity of each field robot, and identifying the movement path of the field robot in combination with the time relationship of the key frames. The field robot is identified by using the colors of the fixed spherical marker,s and compared with identifying the robot by using contour features, the huge calculation workload can be avoided, so that the calculation speed and the monitoring efficiency can be improved; The image distortion correction method provided by the invention is simple in algorithm, and is beneficial to controlling the processing scale of the position image data of the field robot, thereby improving theprocessing speed.
Owner:CHANGZHOU UNIV
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