107results about How to "Taking into account the accuracy" patented technology

The invention discloses a method for analyzing wing structure aero-elasticity stability based on aerodynamic force uncertain order reduction. The method is based on unsteady aerodynamic force model order reduction method based on CFD technology; uncertainty of numerical calculation and aerodynamic parameters during aerodynamic force identification process is taken into comprehensive consideration and is uniformly quantified as an uncertain bounded interval noise sequence in an identification model; uncertain order reduction of the aerodynamic force model is realized by means of interval set membership identification algorithm; unsteady aerodynamic uncertain order reduction model based on CFD technology is established; mathematical model of uncertain aero-elasticity system of state space form is established coupled with structural motion equation; an effective method for predicting system robustness stability boundary from the prospective of section state matrix characteristic values. The aero-elasticity system uncertainty modeling thinking and stability boundary prediction technology provided by the invention gives consideration to calculation efficiency, analysis precise and system robustness.

The invention relates to a sampling clock generation circuit for a multichannel time interleaving analog-digital converter. The sampling clock generation circuit for the multichannel time interleaving analog-digital converter is composed of a multiphase clock generation module, a duty ratio recovering circuit and a channel selection module, wherein the multiphase clock generation module generates a multiphase clock signal required by the multichannel analog-digital converter and compensates for the a phase error of the multiphase clock signal at the same time, so that the accuracy of sampling clocks between channels of the analog-digital converter is guaranteed; the duty ratio recovering circuit conducts edge adjustment on a multiphase clock generated by the multiphase clock generation module, namely duty ratio recovery is conducted, and the output multiphase clock signal serves as a sampling clock signal of a sampling hold circuit; the channel selection module receives a control code written in through an external serial port, judges the number of required internal channels, controls the opening and closing of the internal channels and selects a multiphase clock inside a multiphase pulse module according to the control code, so that sampling clock generation is achieved under the condition that different channels are selected.

The invention provides a gesture-adjustable coordinate decoupling robot with seven degrees of freedom. The robot comprises an Z-axis vertical lifting module, an X-axis horizontal moving module, a Y-axis horizontal moving module, a gesture adjusting module and a tool moving module which are successively connected. The robot comprises degrees of freedom of Z, X, Y, alpha, belt and gamma and L straight line degree of freedom. For degrees of freedom disposition, a redundancy control method is provided, where the gesture can be adjusted in advance and the coordinates are then fully decoupled. The control method comprises the following steps: firstly adjusting three rotating gestures of a tool to a certain angle; and then controlling the other four degrees of freedom, wherein the tail end of the tool reaches a certain position, that is, on the premise of maintaining the tool in a certain unchanged angle, the tail end of the tool is easy to reach a certain coordinate position, so that gesture angle control and coordinate position control are decoupled. According to the robot provided by the invention, the redundancy f the system is increased, and the robot is convenient to operate and control, and has a wide application prospect in special application environments such as industries, medical treatment and services.

The present invention extensible markup language (XML) document amending trace record method, belongs to the field of computerized content managing and publishing technology. In available technology, the business data is maintained in special file format to record the amending trace of record data and this has the problem of difficulty in automatic recognizing and reusing. The method of the present invention is in the mode of separating amending trace data and XML document format and recording XML document amending trace in technological measure based on process. The method of the present invention can back up the amending trace record of XML document in any format while considering the requirement in both record precision and memory space.

The invention relates to an electromyographic signal classification method based on a multi-kernel support vector machine. For a sample with complex distribution, based on the classification performance of a single-kernel support vector machine, the classification accuracy and the quantity of support vectors are easily influenced. The method combines a multi-kernel support vector machine method with a binary tree combination strategy and comprises the following specific steps of: collecting electromyographic signals of the lower limbs of a human body through an electromyographic signal acquisition instrument; denoising the electromyographic signals containing interference noise by using a wavelet coefficient inter-scale correlation denoising method; extracting the features of the denoised electromyographic signals to obtain the features of the electromyographic signals by using denoised wavelet coefficients; and classifying on the basis of the multi-kernel support vector machine. The method can well meet the multi-classification requirement of lower extremity prosthesis control, and takes into account both accuracy and instantaneity, and has broad application prospects in the multi-movement mode recognition of intelligent prosthesis control.

The invention provides a dual-motor wire-controlled complex steering system and a control method thereof. The dual-motor wire-controlled complex steering system comprises a steering wheel, a steeringcolumn assembly, a road sense assembly, a dual-motor steering execution device and a steering control unit, and steering control of the system is completed through an adaptive control method. According to the dual-motor wire-controlled complex steering system, integration and unification of steering performance such as larger steering torque, lower energy consumption, faster response speed can berealized, steering control parameters are adjusted automatically according to actual driving situation, uncertainty in driving environment can be better resisted, and steering accuracy and vehicle safety are ensured.

The invention provides an improvement-based KNN (K Nearest Neighbor) text classification method. The method comprises the following steps: preprocessing a training text, computing the feature vector of each training sample, and constructing a feature vector spatial model of a training set; defining a density and a distance, defining a density and a distance, defining a whole sample space into a plurality of spherical regions and outliers according to types, and storing as a training set library; during testing, judging whether a text to be tested falls into a certain spherical region, judging the type of the text to be tested according to a corresponding mark number, otherwise, using the outliers and the center point of each sphere as a training set library, calling a KNN algorithm, and judging the type of the text to be tested. By adopting the method provided by the invention, the classification speed, classification accuracy and data skew sensitivity are considered. The method can be well applied to the classification problem of non-spherical distribution, and is particularly suitable for a text classification problem having a high-dimension feature vector and a distribution irregularity feature.

A pixel circuit, a drive method based on the pixel circuit, and a display device. The pixel circuit comprises: a first capacitor (C1), a second capacitor (C2), a second transistor (T2), a third transistor (T3) and a light-emitting branch for being coupled between a first common electrode (VDD) and a second common electrode (VSS); wherein the light-emitting branch comprises a first transistor (T1), a fourth transistor (T4) and a light-emitting element (OLED) which are connected in series; a first electrode of the first transistor (T1) is coupled to a second electrode of the fourth transistor (T4), and a coupling node is a third node (C); and a control electrode of the fourth transistor (T4) is used for inputting a second scanning control signal (V EM), and the fourth transistor (T4) switches the ON/OFF state of the light-emitting branch in response to the second scanning control signal (V EM). At the programming stage, a threshold voltage of the first transistor (T1) is input to a first node (A) through the third transistor (T3) and is stored; and at the light-emitting stage, a light-emitting current for driving the light-emitting element (OLED) is generated according to information about a voltage difference across two ends of the first capacitor (C1). The pixel circuit is used for compensating for the threshold voltage shift of the first transistor (T1) and the light-emitting element (OLED).

The invention provides a method and system for recognizing the application type of flow data. The method comprises the steps that a coarse-grained classification method is used for recognizing the application type of the flow data; if the application type of the flow data cannot be recognized, a fine-grained classification method is used for recognizing the application type of the flow data. By the adoption of the method and system for recognizing the application type of the flow data, the application type of the flow data can be recognized with both high efficiency and high precision.

The invention relates to an optimization design method for a non-API (American petroleum institute) thread sealing face. The method includes: constructing an optimization objective function according to the sealing quantity requirement of a plurality of limited condition loading points; describing the shape of the sealing face of an internal thread and an external thread with non-uniform B-spline curves; using control vertex coordinates of characteristic polygon of the non-uniform B-spline curves as variables of the optimization design; determining constraint conditions of the variables of the optimization design according to diameter parameter range requirements of oil bushing sealing face and upper limit requirements of contact interference of the sealing face; using numerical simulation of finite element to build the objective function of sealing of the sealing face and connection among different shape design variables of the sealing face; constructing test data points used for evaluating response function via numerical simulation; constructing an optimization model; using non-dominated sorting genetic algorithm modifier based on robust design method to implement multi-object optimization; and determining Pareto optimal solution collection. By the method, targeted and precise control of sealing integrity of threaded connectors is achieved.

The invention discloses a gas storage well shaft detection system based on an ultrasonic phased array technology and a detection method thereof. The system comprises surface equipment such as a system host, optical fiber communication equipment and an encoder as well as underground equipment such as a centering device, an ultrasonic phased array detector and an annular phased array probe. The detection method includes the steps that the system host is started, and the centering device is adjusted to keep the underground equipment in coaxial parallel with a shaft; electric signals, for detecting control information, of the system are converted into optical signals through an optical transceiver and are transmitted to the ultrasonic phased array detector through optical fiber; the annular phased array probe is stimulated by the ultrasonic phased array detector according to the focusing law to transmit ultrasonic waves to scan the shaft wall; after being converted into optical signals, collected echo electric signals are transmitted to the system host through optical fiber to be stored and processed into images. Real-time S display and C display can be achieved by the detection system, the scanning coverage rate can be flexibly adjusted by changing the stepping magnitude of an ultrasonic deflecting angle, a corroded part is located and scanned carefully, and detection speed and detection precision are high.

The invention provides a test paper reviewing system, comprising: a first terminal device, which includes a first display module for displaying test questions of an electronic test paper to students and a first input module for allowing students to input answer results of the test questions; a second terminal device, which includes a second display module that displays the electronic test paper with the answer results marked as different colors to a paper reviewing teacher and a second input module for the paper reviewing teacher to read the electronic test paper; a server, which is in communication connection with the first terminal device, the second terminal device and a test paper database and which is provided with a first reviewing module, a score statistics module and a second reviewing module, wherein the first reviewing module is used for automatically comparing answers of test questions stored in the test paper database with the answer results to generate preliminary reviewing results, the score statistics module is used for receiving and carrying out statistics on the preliminary review results, and the second reviewing module is used for generating a final marking result according to the input of the reviewing teacher. The test paper reviewing system provided by the invention has higher efficiency and enough precision.

The invention discloses a power grid component cascading failure simulation method. According to the invention, voltage and line active power flow, which have great influences for the failure rate of a component, are selected to act as variables to correct the failure rate of the component so as to enable the simulation to be closer to the reality; traditional methods such as proportional load shedding, nearby load shedding and load shedding performed according to the importance degree of loads are abandoned when load shedding is performed, an optimal load shedding method is adopted, and all factors, which can be used for adjustment, in the system are comprehensively utilized, so that a problem of load shedding is well solved theoretically so as to acquire an operation scheme capable of enabling the overall benefit of the system to be the highest; and the power grid component cascading failure simulation method not only considers an alternating-current mode, but also considers a direct-current mode in power flow calculation, so that both the calculation accuracy and the calculation speed are well considered.

The invention relates to the technical field of focusing, and in particular relates to a quick and automatic focusing method and a quick and automatic focusing device for a camera. The quick and automatic focusing method comprises the steps of a focusing value computation step including moving a lens to a plurality of different focusing positions to obtain image data of an object, and computing an estimated focusing value corresponding to each image data under a first high frequency and a focusing judgment value corresponding to each image data under a second high frequency; a direction determination step including computing a change rate between the current focusing judgment value and the previous focusing judgment value, and determining the moving direction of the lens according to the sign of the change rate; a speed determination step including comparing the change rate with a preset focusing change threshold value, and determining the moving speed of the lens according to the comparison result; and repeatedly executing the above steps until the lens moves to the focusing position corresponding to the maximal estimated focusing value. According to the quick and automatic focusing method and device for the camera, the different moving speed is used at different position, the focusing time is effectively reduced, both the focusing speed and accuracy are improved, and very high reliability and practicability are provided.

The invention discloses a robot indoor positioning system including a robot, a ceiling and a plurality of beacons. The robot has an image acquisition module at the top of the robot, and an image processing module, a building block module and a positioning module are arranged inside the robot. The system of the invention can realize the real-time positioning in the room, and the accumulative error of the odometer is corrected based on the beacon positioning, and the processing speed is fast and the anti-interference ability is strong. The invention also discloses a robot indoor positioning method.

The invention relates to an adaptive plane layering method based on an additional material remanufacturing point cloud model. The method comprises: step one, a layering direction is determined; step two, a layering height is determined; to be specific, traverse of point cloud coordinates is carried out to obtain a zmin and a zmax, difference processing is carried out on the zmin and the zmax to obtain a layering height; step three, an inter-layer point cloud mapping relationship is constructed; step four, a surface error is defined; to be specific, a surface error P is defined to express a surface difference degree between two slices, wherein sigma is equal to Rmax and the Rmax expresses a maximum value a radial width R of a projection point cloud; and step five, a layering thickness is determined. According to the adaptive plane layering method, the maximum value of the radial width R of the projection point cloud is used as a surface error and thus an adaptive layering height is determined by iteration; the algorithm implementation process is clear; and both efficiency and precision are considered.

The invention discloses a large-scale fire situation analysis system based on spatial positioning. The system comprises data acquisition assemblies, a data communication assembly, a data processing platform, and a data analysis and display platform. The data acquisition assemblies are capable of carrying out spatial positioning and acquiring ambient environment parameters. The data acquisition assemblies collect ambient environment parameters and send the collected data and position information externally regularly by a wireless transmitting module. The data communication assembly receives data sent by the data acquisition assemblies, filters the data, and forwards the filtered data to the data processing platform. The data processing platform receives the data sent by the data communication assembly and processes the data to obtain situation information being able to reflect the fire situation. The data analysis and display platform is used for displaying the processed fire situationdata in real time and carrying out fire situation analysis and evaluation based on the fire situation. Therefore, the development trend of the fire can be sensed in real time and the fire situation isdisplayed at the data analysis and display platform, so that the disaster level is evaluated.

The invention relates to a measurement system and a measurement method for a derating curve of an LED (light-emitting diode), belonging to the technical field of detection on thermal properties of semiconductor optoelectronic devices. According to the measurement system disclosed by the invention, the LED to be tested, a thermocouple and a clamp are arranged in a constant-temperature oven, and the LED to be tested and the thermocouple are arranged in the same position on the clamp. A digital source meter is connected with the LED to be tested, and a digital universal meter is connected with the thermocouple. The digital source meter, the digital universal meter, the clamp and the constant-temperature oven are respectively connected with a computer. The digital source meter is used for providing forward current for driving the LED to be tested; the constant-temperature oven is used for providing a stable environmental temperature; the thermocouple is used for detecting the actual environmental temperature in the vicinity of the LED to the tested; the digital universal meter is used for patrol inspection on the resistance of the thermocouple; and the computer is responsible for collecting and processing related data and outputting the graphical derating curve to a user. Compared with the prior art, the measurement system and method disclosed by the invention have the advantages of high efficiency, accuracy and a wide range of applications.

The invention discloses a liquid-gas suspension electric main shaft. The liquid-gas suspension electric main shaft comprises a main shaft, a motor stator, a motor rotor, a box body, a front bearing assembly and a rear bearing assembly, wherein the motor stator is sleeved in the box body; the motor rotor is sleeved on the main shaft; the main shaft is placed into the motor stator and is supported on the box body through the front bearing assembly and the rear bearing assembly; the front bearing assembly is provided with at least one front liquid bearing and at least one front gas bearing; and the front liquid bearing and the front gas bearing are arranged axially. The liquid-gas suspension electric main shaft can meet requirements of high-efficiency processing and high-precision processing at the same time.

The embodiment of the invention provides a beam scanning ground penetrating radar system and an intelligent beam scanning detection method. The beam scanning ground penetrating radar system comprisesa transmitting array, a receiving array, a host and a beam controller. The transmitting array is connected with the host and the beam controller. The receiving array is connected with the host; the transmitting array is used for transmitting a detection wave beam capable of intelligently scanning; the receiving array is used for receiving an echo signal; the host is used for controlling the transmitting array to transmit the detection wave beam and controlling the receiving array to receive the echo signal; and the beam controller is used for adaptively adjusting the beam parameters of the transmitting array according to the detected environment change. The intelligent wave beam scanning technology is introduced into the transmitting system of the ground penetrating radar, the dynamic adjustment can be achieved, the abnormal body sensing capacity is achieved, reusable software and hardware resources are utilized, the radiation electromagnetic wave beams of the transmitting system are flexibly changed, the intelligent high-gain wave beam scanning is achieved, and the detection depth, precision and efficiency are considered.

The invention discloses a multi-band dynamic phasor electromagnetic transient simulation method and system for a voltage source type converter, and relates to the field of power system analysis, and the method mainly comprises the steps: obtaining an electrical signal of the voltage source type converter; establishing a switching function of each switching device according to the direct-current side voltage signal and the alternating-current side voltage signal of each switching device; establishing a voltage source type converter model according to the switching function of each switching device, the power grid alternating current side three-phase voltage signal, the power grid alternating current side three-phase current signal and the direct current side voltage signal; processing the voltage source type converter model by adopting a multi-band dynamic phasor method, and establishing a multi-band dynamic phasor electromagnetic transient simulation model of the voltage source type converter; and performing large-step simulation on the multi-band dynamic phasor electromagnetic transient simulation model of the voltage source type converter to obtain a simulation result. Accordingto the multi-band dynamic phasor electromagnetic transient simulation method and system for the voltage source type converter, the simulation precision and efficiency can be effectively considered.

The invention relates to a GNSS signal capturing method based on an artificial neural network, which comprises the following steps of: training a multilayer perceptron neural network by taking a maximum correlation peak value generated during GNSS signal capturing and maximum correlation peak value data of frequency points nearby the maximum correlation peak value as a data set to obtain an optimal neural network structure and parameter values, and acquiring a GNSS signal according to the obtained neural network structure and parameter values. And high-precision carrier frequency prediction is carried out. The method utilizes the artificial neural network to predict the spatial distribution of the related peak values, shortens the search time of the carrier frequency, realizes the rapid capture of the signal, and improves the capture precision and the capture speed.

The invention relates to the application field of power system optimization control technology, and provides a micro-grid integrated scheduling and control method based on an extreme dynamic programming algorithm, and a computer-readable storage medium. A computer program is stored in a storage medium. The method is implemented when the computer program is executed by a controller. The micro-gridintegrated scheduling and control method based on the extreme dynamic programming algorithm, by using the dynamic programming algorithm and using sag control and economic scheduling in cooperation, avoids the limitation of the trial and error mechanism of a traditional intelligent algorithm, and introduces an extreme learning machine so as to greatly increase the pre-learning speed of the algorithm. In the process of operating the algorithm, the method, by means of continuous online learning fine tuning, continuously enhances the prediction ability and the decision-making ability of the algorithm to obtain a good control effect, can achieve integrated scheduling and control of the micro-grid quickly and efficiently while taking account of accuracy and learning speed.

The invention relates to a fast calibration method of a microwave high power passive distributor. On the basis that the distributor is selected, the design frequency is determined, the number of positions in which an admittance slider needs to walk in the x direction and the y direction is determined; firstly, a limited number of positions of given frequency points are measured, and the changing rule of scattering parameters of the distributor is acquired along with the movement of the admittance slider in the x direction and the y direction; then, on the basis of test data, a mathematical function of changes of magnitudes and phase positions of scattering parameters along with positions is acquired through fitting with a data fitting method, on the basis of the mathematical function, scattering parameter data in other positions are derived with a value calculating method, a least square method is selected as the value calculating method, and a calibration table is established and used for subsequent testing. According to the method, testing accuracy and testing efficiency can be both taken into consideration, and high-accuracy fast calibration is achieved.

The invention discloses a bispectrum laser imaging device for extremely weak signals. The bispectrum laser imaging device comprises a bispectrum pulse laser transmitting system, a light shield, an optical receiving system, a spatial light modulator assembly, a relay optical assembly, an array detection assembly, a multi-channel high-speed signal acquisition unit and a comprehensive control and data processing unit. The bispectral pulse laser emission system emits two beams of laser with different wavelengths to irradiate a target. The generated back scattering signals are converged to a primary image plane where the spatial modulator is located through the optical receiving system; through spatial modulation, a laser signal is reflected to the relay optical assembly; the array detection assembly detects laser signals of two wavelengths, the multi-channel high-speed signal acquisition unit acquires and records the signals, and finally the comprehensive control and data processing unit completes calculation imaging based on the compressed sensing theory and reconstructs three-dimensional images of two wavelengths of a target at the same time.