41results about How to "Avoid Calculation Bias" patented technology

The invention discloses a dynamic compensation method for an ultrasonic flow meter. The dynamic compensation method comprises the step of measuring time dynamic period compensation and further comprises the step of conducting fluid density compensation, the step of conducting time difference temperature compensation of ultrasonic countercurrent spreading time and ultrasonic fair current spreading time, the step of looking up a calibration coefficient dynamically according to a calibration coefficient lookup table established in advance and the step of calculating the flow of multistage dynamic compensation, and therefore measuring time dynamic period compensation is conducted on the problem that ultrasonic spreading time measurement has deviation due to the water attack effect brought by instant opening and closing of a valve or residual bubbles in a pipeline; furthermore, compensation is conducted on the liquid density change caused by the temperature; temperature compensation is conducted on the time difference benchmark treating the influences of the temperature change of an element in a circuit box, the lookup table is established on the calibration coefficient without a constant value, and dynamic looking-up is conducted during flow calculation.

The invention discloses a search method and device in dialogue realization and a computer readable storage medium. The method comprises the following steps: obtaining a question statement requesting dialogue; retrieving the question sentences in inverted index information constructed by taking the words as granularity to obtain matched words; positioning a question under a knowledge point pointedby the positive index information through question identification information mapped by words matched with the question statements in the reverse index information; and according to the positioned question, obtaining an answer under the knowledge point as a question statement request from positive-row index information constructed by taking the knowledge point as granularity to perform conversation. In this way, the inverted index information is constructed by taking the words as the granularity, the problem statements are matched by taking the words as the granularity, and each word in the problem statements is matched in the inverted index information, so that the problem of calculation deviation in the matching of the problem statements is avoided, the difficulty of obtaining answers indialogue realization is effectively reduced, and the accuracy of the answers is improved.

According to the technical schemes, the invention provides an acquisition method of a linear density coefficient curve, a positioning method of a double-end tuft center line and an acquisition method of a standard tuft curve. The methods have the advantages that a calculation deviation of a Lambert-Beer optical algorithm is eliminated, and the problem that in existing optical measurement, the deviation of the position where the fiber density is higher is larger is solved; by means of the novel sampling, image measurement and signal analysis method, the problems that noise is generated in measurement signals, and a tuft start line is difficult to recognize can be avoided, the accurate position of the tuft start line and accurate information of the highest linear density are obtained, and the complete and accurate tuft curve and linear density curve are calculated.

The invention discloses a method and device for optimizing the instantaneous dynamic state of an LLC resonant converter load. Firstly, an actual test of a specific point is carried out on the LLC resonant converter; discrete points related to the LLC switching frequency, the input voltage, the output voltage and the output current are obtained; and fitting is carried out to obtain an optimal objective function of the LLC switching frequency, and then through dynamic load switching judgment, a final output PID result of the voltage loop controller linearly approaches an expected output value ofthe optimal objective function when a load suddenly changes. An effective LLC switching frequency target function is obtained through a simple fitting mode, and the PID output result of the voltage controller linearly approaches the expected value of the LLC switching frequency during dynamic load switching. According to the method, the calculation deviation and a large quantity of calculation caused by LLC small signal model modeling are avoided, and the change speed of the LLC switching frequency is increased, so that the dynamic response speed of the LLC is increased under the condition that the hardware cost of the system is not increased.

The invention discloses a genomic microsatellite wide-area length distribution estimation method considering tumor purity factors. The method includes the steps of completing data feature extraction;finding out microsatellite candidate regions; using a clustering algorithm to filter ignored microsatellite candidate regions; traversing read segments of the regions and performing segmentation; estimating the tumor purity of a given sequencing sample; estimating the length distribution parameter of the tumor tissue microsatellite; using the average length distribution of the long microsatelliteto reflect its overall length distribution; estimating the average length of the microsatellite based on the coverage containing the microsatellite specified window, then iteratively estimating the coverage of the specified window using the updated microsatellite mean length, and completing the detection of the pure tumor sample long microsatellite; and determining the long tumor microsatellite state to complete the wide-area length distribution estimation. The invention solves the calculation deviation caused by the purity problem of the tumor sample of the input data, breaks the limitation of the sequencing read segment length on the length of the detectable genomic microsatellite, and realizes the wide-area length detection.

The invention provides a frequency detection method and device, electronic equipment and a storage medium, and relates to the technical field of sensors, a plurality of vibration signals are obtained through a plurality of sensors, a filter bank is adopted to filter the plurality of vibration signals, a plurality of filtered analog signals are obtained, analog-to-digital conversion is performed on the plurality of filtered analog signals, and a frequency detection result is obtained. The method comprises the following steps: acquiring a plurality of digital signals, respectively determining the maximum amplitude frequency corresponding to each digital signal in the plurality of digital signals, and determining a target frequency value based on the maximum amplitude frequency corresponding to each digital signal. Signals are acquired based on a plurality of sensors, and finally, a plurality of maximum amplitude frequencies are used for comprehensive calculation to determine a target frequency value, so that the signal acquisition error of a single sensor and the calculation deviation caused by different contact degrees of a to-be-detected object and the single sensor are avoided.

The embodiment of the invention provides a transportation oil fee evaluation method and device. The method comprises: determining the average vehicle load and the average vehicle oil consumption corresponding to a target line according to historical vehicle transportation information of a vehicle on the target line; according to the vehicle average load, the vehicle average oil consumption and thecurrent oil price, determining the vehicle average oil fee of the vehicle corresponding to the target line. According to the method, the transportation oil consumption cost of the vehicle on the specific driving road section can be effectively, accurately and conveniently obtained.

The invention discloses a magnetic resonance coil position determination method and device, and a magnetic resonance imaging system. The method comprises the following steps of collecting magnetic resonance signals received by a coil in pre-scanning and determining projection data of the coil; determining an initial center of gravity position of the coil according to the projection data and a corresponding gradient distortion correction factor; calculating an offset of the initial center of gravity position relative to a physical center of gravity of the coil according to a physical structuralparameter of the coil and a coil channel receiving the magnetic resonance signals in the coil; and migrating the initial center of gravity position for the offset to obtain the physical center of gravity position of the coil. In the invention, a calculation speed is fast, and interferences of a marker on the magnetic resonance signals are avoided; and a calculation deviation caused by signal distortion losses and the like when the coil is at an imaging edge is solved, and accuracy of coil positioning is improved.

The invention provides a method and a device for calculating the fatigue life of a suspension bridge sling. The method comprises the following steps: collecting the vehicle load data of a suspension bridge within preset days to reconstruct the vehicle load flow of the suspension bridge sling every day; establishing a three-dimensional space finite element model of the suspension bridge, and basedon the three-dimensional space finite element model, calculating the internal force of the sling under the action of dead load and obtaining the continuous influence surface of the internal force of the sling; loading the reconstructed vehicle load flow of every day to the continuous influence surface of the internal force of the sling to obtain the internal force time travel curve of the sling every day generated by the vehicle load; and according to the internal force time travel curve and the internal force under the action of the dead load, obtaining the fatigue damage of the sling every day, and determining the fatigue life according to the fatigue damage of the sling every day within the preset days. With adoption of the method, the calculation deviation caused by the randomness of the vehicle load data within a short period is avoided.

The invention discloses a feature fitting-based visual inspection method for substation instrument and equipment inspection. With feature fitting-based instrument pointer positioning technology adopted, on the basis of the circular projection, edge statistics and fitting analysis of pointer edge features, two included sides of a pointer and the intersection point of the two included sides of the pointer are calculated; and during scale value calculation, linear interpolation is performed on two scales which are the closest to the pointer. With the method of the invention adopted, a current scale value can be the accurately estimated, and scale value calculation deviation caused by the positioning deviation of the center of an instrument or image tilt can be avoided.

A method suitable for positioning a transformer substation electrical apparatus partial discharge space belongs to the high-voltage insulation measuring technology and application field. The aim of the invention is to adopt a method suitable for positioning a transformer substation electrical apparatus partial discharge space to process signals of ultra-high frequency electromagnetic wave with improved energy accumulation function so as to avoid calculation deviation due to iterative algorithm depending on initial values. The method of the invention comprises steps: after collecting the ultra-high frequency electromagnetic wave signals, using the improved energy accumulation function to process the signals; drawing a curve line of the improved energy accumulation function based on the improved energy accumulation function; confirming the signal collecting moment of sensors; using four sensors to receive UHF signals of partial discharge radiation and simultaneously record at the starting time; acquiring an equation based on coordinates of a partial discharge source and coordinates of the sensors; acquiring two independent linear equations of the partial discharge coordinates related to unknown numbers; and acquiring two groups of results. In these two groups of results, only one result meets the no-linear equations; and the values are the coordinates of the partial discharge source. By adopting the method provided herein, the calculation deviation due to iterative algorithm depending on the initial values is avoided.

The invention provides a rapid calculation method for the reasonable productivity of a shallow lithologic gas reservoir. The rapid calculation method for the reasonable productivity of the shallow lithologic gas reservoir comprises the following steps of 1 collecting gas reservoir parameters and determining single well production parameters; 2 converting the productivity according to the actual productivity of the gas test well; 3 calculating the productivity ratio and analyzing an abnormal point; 4 determining the productivity ratio of the stable period, and further obtaining the reasonable productivity of the gas reservoir. The fast calculation method for the reasonable productivity of the shallow lithologic gas reservoirs can effectively reduce the calculation difficulty, avoid the calculation deviation caused by unqualified test data, and derive a method which is not limited by surface conditions, and can replace the original method to a certain extent, and can also reduce resourceconsumption.

The invention discloses an insulation detection method and device for an electric vehicle. The method comprises the steps that a first voltage parameter of a vehicle-mounted rechargeable energy storage system to an electric platform is collected; after a first resistor is connected between the vehicle-mounted rechargeable energy storage system and the point platform, a second voltage parameter of the vehicle-mounted rechargeable energy storage system to the point platform is collected; after the first resistor is disconnected, acquiring a third voltage parameter of the vehicle-mounted rechargeable energy storage system to the electric platform; according to the first voltage parameter, the second voltage parameter, the third voltage parameter and the first resistance, calculating an insulation resistance parameter of the vehicle-mounted rechargeable energy storage system to the electric platform; the third time of sampling is carried out after the first resistor is disconnected, and the insulation resistance parameter of the vehicle-mounted rechargeable energy storage system to the electric platform is calculated based on the voltage parameters sampled for three times, so that calculation deviation caused by insulation or voltage jump and insulation resistance jump in the detection process can be prevented, and the accuracy of insulation resistance measurement of the electric vehicle is improved.

The invention relates to a method for evaluating low-speed impact damage residual strength of a winding composite material structure. Comprising the steps of 1, low-speed impact damage simulation calculation of the winding composite material structure; step 2, outputting and importing a unit damage state; a predefined field variable analysis method is adopted to achieve transmission of damage information between low-speed impact damage and residual strength simulation of the composite material structure; 3, establishing a low-speed impact damage residual strength model of the winding composite material structure containing the initial damage; step 4, calculating residual intensity; the winding composite material structure low-speed impact damage residual strength model established in the third step is obtained; the method can meet the requirement for predicting the residual strength of an existing winding composite material structure after low-speed impact damage, finite element simulation is applied to low-speed impact damage residual strength calculation of the winding composite material structure, and the damage state, obtained through low-speed impact simulation calculation, of a unit is imported into a finite element analysis model; therefore, the transmission of damage information is realized.

The invention discloses a thermal power plant hour-level carbon emission on-line monitoring method, which comprises the following steps: forming a unit output-carbon emission intensity characteristic curve by using historical data learning based on a generating capacity method, and calculating the carbon emission according to the real-time output of a unit; calculating to obtain power generation carbon emission intensity by using the material consumption of the previous day based on a material method, and then calculating the carbon emission according to the real-time output of a unit; and calculating the carbon emission by using the carbon dioxide concentration or the oxygen concentration in the CEMS system based on a flue gas method. And determining the final unit hour-level carbon emission according to whether the carbon emission curves calculated by the three methods are in the same group or not. According to the method, hour-level accurate online monitoring of the carbon emission of the thermal power plant can be realized, the defects of a single calculation method are overcome, calculation result deviation caused by errors of a certain calculation method is avoided, and support is provided for accurate monitoring of the hour-level carbon emission of the thermal power plant.

The invention discloses bidirectional automatic synchronous tension dimension inspection equipment which comprises a working table plate, wherein a concave groove is formed in the surface of the upper end of the working table plate, a bidirectional threaded rod is rotationally connected into the concave groove through a bearing, a T-shaped threaded block is in threaded connection with the outer surface of the bidirectional threaded rod, a lap joint plate is fixedly connected to the upper end surface of the T-shaped threaded block, a U-shaped plate is fixedly connected to the upper end surface of the lap joint plate, and a hydraulic cylinder is fixedly mounted at the upper end of the U-shaped plate. Through employing a servo motor, the bidirectional threaded rod, the T-shaped threaded block and three gear discs, the whole equipment can realize a bidirectional automatic synchronization function when tension dimension inspection is carried out, so that certain automation is achieved, through arrangement of a fixing frame, a camera and a sliding sleeve, the whole equipment can be known through image analysis during reading, the overall reading is more accurate, and later calculation deviation caused by errors is avoided.