443results about How to "Avoid calculation errors" patented technology

Provided is an automatic document summarization extraction method based on term vectors. The method includes the steps that S1, a deep neural network model is used for training linguistic data to obtain term vector representation of feature terms; S2, a sentence graph model is constructed; S3, the weights of sentences are calculated; S4, a maximum marginal relevance algorithm is used for generating a summarization. According to the method, a linguistic data set is collected and preprocessed to obtain a training feature linguistic data set, the deep neural network model is used for training the constructed training feature linguistic data set to obtain the term vectors of the feature terms, a candidate document set and a candidate sentence set are obtained from the linguistic data set through preset search terms, the semantic similarity between the senesces is obtained according to the term vectors of the feature terms, and then the semantic relation between every two sentences is obtained. The problem that in a traditional calculation method based on term co-occurrence, calculation errors are caused under the condition that semantic meaning is identical but terms are different is avoided, and therefore the accuracy of similarity calculation and the performance of the summarization are improved.

The invention discloses image segmentation method and device, and a method for judging image inversion and distinguishing the front side and the back side of a sternum. The image segmentation method comprises the following steps of: a. preprocessing the input image; b. searching the outline of the target area, and checking the search result of the outline, wherein the process for checking the search result of the outline comprises the following steps of: judging whether the shape abnormity index of the target area in the outline search process is less than or equal to a preset threshold value; if so, accepting the result of the search process; and if not, rejecting the result of the search process; and c. extracting the target area according to the check result. By increasing the check procedure, the invention can enable a user to reasonably distinguish the input image, thereby solving the problem that the image abnormity affects the segmentation.

The invention provides a fatigue analysis method and a fatigue analysis device of a structural member in a wind generating set. The method comprises the following steps: establishing a finite element model for a to-be-measured structural member involving bearing connection and related structural members thereof; applying load to the finite element model according to various preset load working conditions respectively; acquiring each node stress result of the to-be-measured structural member under each load working condition through finite element analysis; scaling down the acquired stress results by taking a fatigue load sequence which is pretreated through regularization as a coefficient; synthesizing the stress results under the different load components after scaling down to obtain a stress spectrum of each node of the finite element model of the to-be-measured structural member; calculating a fatigue damage value of the to-be-measured structural member according to the stress spectrum of each node and the stress-life curve of the to-be-measured structural member. By applying the method and the device, the fatigue analysis result of the structural member in the wind generating set is more accurate.

The invention discloses a motion estimation method based on image features and three-dimensional information of a three-dimensional visual system. The method includes the first step of obtaining two-dimensional image information and space three-dimensional information corresponding to two-dimensional image pixels in real time on the basis of the three-dimensional visual system, the second step of controlling collection intervals between adjacent frames through the adoption of an adjacent frame sampling interval self-adaptive regulation method and automatically regulating the sampling intervals of the t+1 moment relative to the t moment according to the dot pair number of the effective matching image features between the frame at the t-1moment and the frame at the t moment, and the third step of synthesizing two-dimensional scene image features and three-dimensional point cloud information and carrying out three-dimensional motion estimation according to the matching point pair number of the current two-dimensional image features of the adjacent frames to obtain high-precision three-dimensional motion estimation. Through the method, on the basis of satisfying accuracy and reliability of the three-dimensional estimation, the calculated amount is effectively reduced, and the method has the advantages of being less in calculated amount, small in limitation to an application scene and the like.

The invention provides a method for controlling fine rolling thickness of hot continuous rolling. The method comprises the steps of acquiring rolling machine parameters and steel strip specification parameters; performing unit step response test for the tail rack rolling machine; determining the unit step response cycle which is the time parameter of hydraulic cylinder transmission function; monitoring the control cycle of an AGC (Automatic Gain Control) system and the quantity of sampling dispersing points after unit step response lag; controlling the tail track rolling machine through the Smith pre-estimation control strategy of a proportional plus integral controller with an inertial element; monitoring an AGC system control model by fine rolling of the hot continuous rolling; controlling the thickness of the next cycle by adjusting a hydraulic system. According to the method, the AGC monitoring control process is treated as a control object with pure lag; the Smith pre-estimation compensation is introduced into the monitoring of the AGC control system; the GM method is carried out to directly perform soft measurement for roller gaps of the rolling machine; therefore, the possible calculation error caused by inaccurate HGC (hydraulic gap control) transmission function can be avoided; the response speed, stability and control precision of the control system can be obviously improved.

The invention relates to an information acquisition system and method, a man-machine interaction system and method, and a pair of shoes. The movement information acquisition system comprises a data acquisition unit used for acquiring acceleration data, a data processing unit used for processing acceleration data, and a data transmission unit used for sending the processing results to a terminal in a wireless transmission manner, wherein the data processing unit comprises a procedure used for acquiring movement information according to the acquired acceleration data; and the terminal receives the information by means of a wireless receive module and then, based on the information, realizes interaction with upper computer software, including movement information comprehensive display, control of the upper computer to perform operation, and control of motion sensing game. The invention also provides a pair of shoes with the man-machine interaction function, which is particularly suitable for games completed by feet, and realizes a novel and free control mode of directly controlling the software or games with the motion of human feet. The man-machine interaction system and method provided by the invention can realize the identification of human body motion modes so as to achieve the purpose of man-machine interaction.

The invention discloses a computing method of blood flow volume and blood flow velocity of a blood vessel per unit time. The computing method comprises the following steps: selecting an interesting region and computing and fitting out a fitting curve, that the grey level of the interesting region varies with time, in an image sequence, computing a time point that the grey level fitting curve achieves the highest descending (or ascending) speed, and integrating the grey level varying fitting curve within a preset time interval taking the time point as a center, so that an area value is obtained; and acquiring blood flow volume per unit time corresponding to the area value, and in combination with the lumen area of the blood vessel, further acquiring blood flow velocity. The computing method disclosed by the invention is innovative that the blood flow volume within an entire cardiac cycle time is computed by taking the position that that the grey level fitting curve achieves the highest descending (or ascending) speed as a center, so that the blood flow volume and blood flow velocity per unit time can be computed more accurately, and errors caused by computing in improper time intervals can be effectively avoided.

The invention discloses a nonlinear dynamics calculation method for a gear pair. The method comprises the steps that the feedback effect of vibration displacement to the dynamic contact condition of agear surface of the gear pair in the actual running process is considered, and the nonlinear excitation of the dynamic meshing rigidity and dynamic comprehensive meshing errors is calculated. Dynamiccontact analysis of the gear pair and a system dynamics solution process are combined, and an excitation-response-feedback loop-locked calculation process of the system is achieved. According to themethod, the nonlinear dynamics phenomenon of the gear pair due to parameters such as gear surface errors and shape correction can be acquired, the dynamics behavior of the system in the dynamic contract process can be more truly simulated, and the calculation accuracy of dynamics is improved.

The invention discloses a three-coordinate measuring method for circumferential uniformly-distributed hole true position error, which comprises the following steps: (1) determining a theoretical coordinate in the center of a circle of a measured hole by calculation; (2) taking the theoretical coordinate in the center of the circle of the measured hole as a target point, and measuring the actual coordinate of the center of the circle of the measured hole; (3) calculating the circumferential relative error and the radial error of the center of the circle of the measured hole; and (4) calculating the true position error according to the circumferential relative error and the radial error or the circumferential absolute error and the radial error, finding out the maximum true position error, and judging whether the maximum true position error exceeds the set error. The three-coordinate measuring method can ensure that a three-coordinate measuring machine realizes automatic measurement and automatic calculation, can accurately measure the benchmark of a given initial datum hole and the benchmark of a non-given initial datum hole, has high universality and simple calculation, and avoids the occurrence that the error caused by the measurement and the calculation makes qualified products in the actual assembly detected as unqualified products so as to bring huge loss to manufactures.

The invention relates to a power transmission line equivalent icing thickness monitoring method. The method comprises the steps that according to axial tension, dip angles and other line status information of insulator chains and wind speed, wind directions, temperature, humidity and other weather information, information fusion is conducted through multisource sensors to qualitatively judge icing conditions first, wherein the influences of the temperature and stress on the lengths of wires are comprehensively considered; a vertical comprehensive load, a horizontal wind load and a vertical wind load of a line are calculated according to the stress of suspension points of the insulator chains; the self weight of the wires and an ice load of the line are solved according to the special situations that the virtual lowest point of the wires falls outside the span distance and the lowest point of the wires on a windage yaw plane deviates; a static equilibrium equation is established in the vertical direction of the windage yaw plane, and an equivalent icing thickness is solved in a loop iteration mode. Compared with the prior art, the method has the advantages that the calculation accuracy is high, and the convergence rate is high.

The invention relates to a calculating method of shale permeability. The multi-field coupling permeability calculating method considering the shale matrix difference is characterized in that the permeability is shown in the description. On the basis of the prior art, the influence of the mutual effect of adsorbed gas and free gas on the shale permeability is further considered, and the influence of the thickness of water membranes on the shale permeability is considered. The influences of the mutual effect of the adsorbed gas and the free gas, the influence of the thickness of the water membranes, and the influence of the viscous flow, diffusion, the adsorbing layer gas thickness, the matrix shrinkage and the stress sensitivity are all coupled into a shale permeability calculating model. The influence of multiple features of shale on the permeability can be more comprehensively represented. Based on respective features of organic matter and inorganic matter of shale, an organic matterpermeability calculating model and an inorganic matter permeability calculating model are built respectively. The calculating error caused by the matrix difference can be effectively avoided.

The invention comprises a calibration method for a fiber-optic gyroscope inertial measurement device with three orthogonalized axes and one inclined axis, particularly relates to a system calibration system for navigating, guiding and controlling a spacecraft, and belongs to the technical field of inertial measurement. The calibration method is used to accurately calibrate the zero position, the scale factor and the installing error of the fiber-optic gyroscope inertial measurement device, and the method is simple and feasible and can effectively increase the calibration accuracy. According to the method, no tool needs to be replaced, so as to guarantee the consistency of a datum plane; the method does not distinguish the scale factor and the installing error, so that the calculation error produced when calculating the small quantity of the installing error is avoided; and compared with other testing methods for the fiber-optic gyroscope inertial measurement device, the method is simple and feasible, improves the calibration efficiency and saves the manpower and material resources.

The invention discloses a pellet production method based on prediction of compressive strength of pellets in a rotary kiln. The method comprises the following steps: 1) collecting related operation parameters of the rotary kiln; 2) establishing a motion model of the pellets in the rotary kiln; 3) measuring and calculating average residence time T of the pellets in the rotary kiln; 4) measuring flame length FL and the distribution of burning rate Rfuel of fuel in the flame length; 5) measuring the distribution of temperature of the pellets Tp along the kiln length direction z in the rotary kiln; 6) measuring a predicted value of the strength of the pellets; and 7) performing online control on process parameters of the rotary kiln according to the predicted value Qp of the compressive strength of the pellets. By using the method for online prediction of the thermal engineering state and the strength of the pellets in the rotary kiln, the transparency of the production process is increased, the control difficulty caused by information hysteresis is reduced, the risks of low finished product rate, accretion of the rotary kiln and the like caused by insufficient strength of the pellets can be reduced, and the thermal engineering operation of the rotary kiln is optimized in an online manner; and the energy consumption can be reduced and the production benefits can be improved.

The invention relates to the technical field of circuit design, and discloses a convolution operation based on an analog matrix operation unit and application thereof. the convolution operation is used for converting and splicing convolution kernels into P transverse quantities with the length of Q and mapping the transverse quantities into an analog matrix operation unit, inputting a characteristic pattern, segmenting the characteristic pattern according to a sliding window, converting the characteristic pattern into N transverse variables with the length of Q, sequentially mapping the N transverse variables with the length of Q into vectors under a pulse wave, and simultaneously outputting N operation results with the length of P through a sampling retainer to obtain a complete convolution result and outputting the convolution result. According to the method, the convolution calculation rate is effectively increased, the power consumption and the circuit area are reduced, high calculation parallelism is achieved, the calculation density and efficiency are greatly improved, and the method has high practical value and wide application prospects.

The invention discloses a torque limiting system of a folding-arm type lorry-mounted crane. The torque limiting system comprises a sensor part, a processor part and a performer part, wherein the sensor part consists of a weight sensor, a length measuring sensor and two angle sensors, the processor part calculates the rated lifting capacity under the current working condition according to sensor signals and compares the rated lifting capacity with an actually-measured lifting capacity, and the performer part sends out alarm signals or limits dangerous operations when alarming or limiting conditions are reached. The torque limiting system of the folding-arm type lorry-mounted crane has the advantages that the inconvenience in the input of a rated working curve and incompleteness of curve expression are avoided; the torque limitation under any working condition of lifting from the tail end of a lifting arm can be performed, and the functions are comprehensive; and as the weight sensor is adopted to directly measure weight, the calculation error caused by factors such as zero drift and delay when a pressure sensor is adopted is avoided, and the accuracy is high.

The invention provides a device for tracing and detecting an interior plate blank head position of a fixed width machine. The device for tracing and detecting the interior the plate blank head position of the fixed width machine comprises a fixed width machine control PLC and a fixed width machine first-level control system connected with the fixed width machine control PLC; the input end of the fixed width machine control PLC is connected with a main transmission motor current signal, a pressing die size, and an inlet pinch roller pressure signal. The fixed width machine control PLC comprises a filtering module, a counting module, a plate blank head position calculating module and a communication module; filter shaping is conducted on the main transmission motor signal by the filtering module; the number of impulses of the main transmission motor current signal is accumulated by the counting module; the plate blank head position is calculated by the plate blank head position counting module, and the calculation formula is a plate blank head position value=28.96m+the number of the impulses of the main transmission motor current signal*the pressing die size; the plate blank head position value is transmitted to the fixed width machine first-level control system in real time by the communication module; the filtering module judges monitored currents, and the impulses are effective when the currents are larger than or equal to 4000A every time.

The invention relates to an overvoltage computing method of a modular multi-level converter. An electromagnetic field theory is used in the method to compute converter stray parameters and build an overvoltage computing model, a circuit theory is used to compute overvoltage of converter electrical grids to the ground and between the electrical grids, the overvoltage is classified and analyzed based on metallic oxide arrester protection properties, and the method comprises the steps of extracting modular multi-level converter stray parameters, building a modular multi-level converter overvoltage model, and computing converter biggest overvoltage according to the arrester protection properties. By means of the overvoltage computing model, computing errors generated by assumed extraction of the stray parameters using equivalent capacitors or plate capacitors are avoided, overvoltage computing accuracy degree is improved, a protection level for direct protection of the modular multi-level converter arrester is confirmed, classification of modular multi-level converter overvoltage computing is simplified, overvoltage analysis difficulty and workload are lowered, device safety is ensured, and overvoltage analysis efficiency is improved.

The invention discloses an oxyhemoglobin saturation detection method and an oxyhemoglobin saturation detection system. The oxyhemoglobin saturation detection system comprises a preprocessing device, a standard model establishing device, an SSF processing device, a waveform characteristic judging device, a device for extracting waveforms of pulses one by one, a signal quality index calculating device, a device for calculating a distance between adjacent peaks of pulse signals, an R value calculating device, an R value Kalman filtering device and an oxyhemoglobin saturation calculating device. In the system adopting the oxyhemoglobin saturation detection method of the technical scheme, because sampled data close to the slope and maximum points of the waveforms of the pulses is selected as sample points for calculating the oxyhemoglobin saturation during calculation, the sample points better represent the oxygen content of blood in a human body, and calculation errors caused by noise interference when peak points/valley points serving as characteristic value points are extracted are avoided, so the noise interference can be effectively reduced, the signal-to-noise ratio of the oxyhemoglobin saturation is improved and the detection accuracy of the oxyhemoglobin saturation is improved.

The embodiment of the present application discloses a fisheye lens image distortion correction method and device. The method includes: acquiring an orthogonal oblique grid target image; extracting a grid center line according to the orthogonal oblique grid target image; calculating a distortion center according to the grid center line; Calculate the distortion coefficients k1 to k6 according to the distortion center; and correct the image captured by the fisheye lens by using a six-parameter correction model according to the distortion center and the distortion coefficient. The fisheye lens image distortion correction method provided by the embodiment of the present application only needs to use a single target, the calculation process is simple, the calculation amount is small, and the accuracy is high, and the fisheye lens image distortion can be effectively eliminated, and the center of the lens and the center of the image are not aligned. Image asymmetry error caused by coincidence.

The present invention provides a three dimensional modeling and optimizing reappearance method of the bicycle collision accident in the traffic field, and the steps include: (1) establishing a three dimensional model of a bicycle and a rider; (2) confirming the touching relationship between the bicycle and the rider; (3) establishing a collision simulating model of the accident condition, the accident car, the bicycle and the rider; (4) confirming the coordinate of centroid position where a car stops, the coordinate of the centroid position where the bicycle stops, the coordinate of the fall point of the buttocks of the rider; (5) confirming an optimizing design variable, a restriction condition and an optimizing object function; (6) conduct optimizing evaluating on the presented objective function by transferring the optimization algorithm; (7) after the repetitious optimization circular calculations, judging the astringency of the objective function and whether the optimum solution is gotten. The present invention improves the calculation exactness, reduces the error and the uncertainty caused by artificial intervention, can conduct reappearance analyzing on the collision accident of the car and the bicycle correctly.

The invention discloses a system and method for positioning a plunger and tracking the running state of the underground plunger. The system comprises a ground monitor subsystem and a plunger monitor subsystem. The plunger monitor subsystem is controlled by the ground monitor subsystem. The ground monitor subsystem collects sonic pulse signals transmitted from a pipeline in real time and processes and analyzes the signals to obtain plunger operation parameters so as to obtain the plunger running state in real time. A combination of a shock-absorbing spring and a pressing cap is respectively arranged at both ends of the plunger monitor subsystem. The technology for positioning the plunger and tracking the running state of the underground plunger provided by the invention overcomes the inherent deficiencies of conventional mathematical model based plug running state predicting mode, provides real time and more direct parameter collection, measuring tools and means, shortens the invalid production time of the plunger, improves the running efficiency of the system, prolongs the trouble-free production period of a plunger lifting system and is beneficial for improving the individual well producing rate of the gas well and stabilizing the yield of the gas well and improving the economical efficiency.

The invention relates to a communication technology, and provides a data summarizing method and a data summarizing device so as to solve the problem that in a current network, statistical data in a current period cannot be correctly acquired when a counter overflows. The data summarizing method comprises the following steps: counting the acquired raw data by using the counter, recording the statistical data in the counter, and recording the overflowing times when the counter overflows; after reaching the ending time point of a statistic period, determining the statistical data and the overflowing times of the statistic period; according to the statistical data and the overflowing times of the statistic period, calculating a total value of the data. Through the data summarizing method and the data summarizing device, the total value of the data can be accurately recorded, therefore, inaccuracy of the total value of the data due to overflowing of the counter is avoided, calculation error of a subsequent business index is prevented and accurate measurement on a system business is ensured.

The invention, which is applicable to the field of power metering technology, discloses a fault power remedy method and system. The method includes: when a fault is detected to occur at a three-phasethree-wire metering loop, a first power factor, an A-phase current, a C-phase current, a line voltage between the A phase and B phase, a line voltage between the B phase and C phase, a bottom value inthe presence of the fault, a bottom value in a fault recovery state, and a multiplying power of the three-phase three-wire metering loop are obtained; on the basis of the obtained parameters, three-phase three-wire fault remedy power is calculated; and the three-phase three-wire fault remedy power sent to a user needing to make a supplementary payment. Therefore, problems of heavy work load of the staff, low working efficiency, and high error rate are solved; the three-phase three-wire fault remedy power can be obtained quickly and accurately; the working efficiency is improved; and no manualcalculation is needed; and calculation errors caused by human factors are avoided and the error rate is reduced.