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38results about How to "Reduce calculation bias" patented technology
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Harmonic contribution division method and harmonic contribution division system
ActiveCN104698273AAccurate calculationInhibition effectSpectral/fourier analysisQuantile regressionMomentum
The invention relates to a harmonic contribution division method and a harmonic contribution division system. The harmonic contribution division method comprises the following steps of acquiring harmonic voltage data of a bus and harmonic current data of a harmonic source to be calculated on a feeder line; calculating background harmonic impedance by using a leading fluctuation quantity method according to the harmonic voltage data and the harmonic current data; and dividing harmonic contributions of the harmonic source to be calculated by using a quantile regression method according to the harmonic voltage data, the harmonic current data and the background harmonic impedance. The background harmonic impedance is estimated by the leading fluctuation quantity method, fluctuation quantity with a leading function is screened out to calculate the background harmonic impedance, influences of background harmonic and measurement noise fluctuation on a background harmonic impedance estimation result are restrained effectively, and the background harmonic impedance is calculated accurately; and the background harmonic current is calculated according to the background harmonic impedance, and quantile regression is performed to obtain the harmonic contributions of the harmonic source. Calculation deviation caused by background harmonic fluctuation can be reduced, division accuracy is improved, and the stability and the data utilization rate are high.
Owner:GUANGZHOU POWER SUPPLY CO LTD +1
Oil-immersed transformer hot spot temperature evaluation method based on multi-parameter fusion
ActiveCN107063502AImprove dynamic response performanceAccurate responseThermometer applicationsCapacitanceDynamic equation
The invention discloses an oil-immersed transformer hot spot temperature evaluation method based on multi-parameter fusion. The oil-immersed transformer hot spot temperature evaluation method includes the following steps of (1) according to the process of heat transfer inside the transformer, clarifying the definition and calculation method of the hot spot heat source and hot oil area of the transformer, and reducing the calculation bias caused by taking the overall winding as the hot spot heat source; (2) correcting the algorithm of the hot oil area thermal capacitance Cwo and the hot spot thermal capacitance Chs, and improving the accuracy of the time constant tau wo and the winding time constant tau hs and the dynamic response capability of the calculation model; and (3) establishing the dynamic calculation equation of hot spot temperature by considering the influence of time-varying ambient temperature and time-varying load on the hot spot temperature. When the dynamic equation of the model is deduced, the temperature characteristics of the load loss and oil viscosity are further considered, and the calculation result can more accurately reflect the temperature rise inside the transformer. The method can dynamically reflect the characteristics of the temperature change inside the transformer, and the calculation is simple and the accuracy is high.
Owner:HAINAN POWER GRID CO LTD ELECTRIC POWER RES INST +1
Method for obtaining surplus energy of battery based on SOC-OCV curve
ActiveCN109683101AGuaranteed accuracyReduce computational complexityElectrical testingAutomotive batteryEngineering
The invention discloses a method for obtaining surplus energy of a battery based on an SOC-OCV curve and belongs to the field of vehicle batteries. The method comprises the following steps that S1, atemperature-rated capacity curve, a temperature-total energy curve and SOC-OCV curves at different temperatures are collected; S2, SOC-surplus energy curves at different temperatures are obtained; S3,the SOC-surplus energy curves at different temperatures are input to a BNS program; S4, query is conducted according to a two-dimensional table to obtain the real-time surplus energy. According to the method, the SOC-OCV curves are used for calculating an integral of released energy to obtain the surplus energy of the battery for the first time, and the surplus energy of the battery at differenttemperatures and SOCs is obtained. According to the method, the accurate surplus energy can be obtained just by testing the most basic battery characteristic, the workload of battery testing is lowered, and the real-time surplus energy of the battery can be obtained in the vehicle operation process.
Owner:安徽优旦科技有限公司
Destination remaining endurance mileage calculation method and device
ActiveCN112208338ASave powerReduce calculation biasElectric devicesElectric vehicle charging technologyElectric vehicleComputer science
The invention discloses a destination remaining endurance mileage calculation method and device, and the method comprises the steps: receiving an actual distance from a current position of an electricvehicle to a destination and a mileage correction coefficient sent by a cloud server, and the current remaining endurance mileage of the electric vehicle, and calculating the destination remaining endurance mileage, wherein the mileage correction coefficient is the ratio of the total estimated power consumption corresponding to the actual distance to the power consumption of the electric vehicleunder the standard working condition, and the total estimated power consumption is the sum of the estimated running power consumption corresponding to the actual distance and the estimated air conditioner power consumption; the problems that according to an existing remaining endurance mileage calculation method, the difference between actual driving working condition energy consumption and standard energy consumption is not considered, and the electric quantity consumed by an air conditioner is not considered, so that deviation exists between the calculated remaining endurance mileage and theactual endurance mileage; and the technical problems of insufficient electric quantity and half-way anchoring in the planned travel are easily caused.
Owner:GUANGZHOU XIAOPENG CONNECTIVITY TECH CO LTD
Method for detecting defects of printed circuit board (PCB) based on skeleton extraction and range conversion
ActiveCN103049753ADoes not affect accuracySmall amount of calculationMaterial analysis by optical meansCharacter and pattern recognitionAlgorithmPrinted circuit board
The invention discloses a method for detecting defects of a printed circuit board (PCB) based on skeleton extraction and range conversion. The method comprises the following steps of: checking an index table to extract a single-pixel skeleton; deleting skeleton branches; and searching for range value domain abnormity, and classifying PCB defects according to abnormal conditions. According to the method for detecting defects of the PCB based on skeleton extraction and range conversion, useless points can be deleted on the premise of not influencing the quantity of connected domains by extracting the single-pixel skeleton in a way of checking the index table, and the extracted skeleton is of a single pixel and has high generality and high practicability; skeleton branches are deleted, and range value domain abnormity is searched, so that calculation deviations can be reduced without influencing the speed and accuracy of skeleton tracking; and branches can be deleted, so that the calculation amount of skeleton search is reduced, and the efficiency of defect identification is increased.
Owner:深圳市强华科技发展有限公司
Imaging method, imaging device and mobile terminal
ActiveCN107483777AReduce thicknessLow costTelevision system detailsColor television detailsCamera lensComputer terminal
The invention discloses an imaging method, an imaging device and a mobile terminal. The imaging method comprises the following steps of utilizing a prism group to a ray of light from a camera lens to carry out total reflection and light splitting processing in order to form two parts of rays of light; and respectively imaging the two parts of rays of light through a first camera component and a second camera component. The rays of light received by sensors of two camera components are from the same light path, so that an image has no deviation, the pixel-level alignment is realized, and the thickness of the mobile terminal is guaranteed to have no increase structurally, so that when the images of the two cameras are fused, the image deviation is not considered, and the software cost and the calculation deviation are reduced.
Owner:上海欧计斯软件有限公司
Magnetotelluric signal denoising method and system based on improved multi-scale dispersion entropy
ActiveCN111597981ASuppress noise interferencePart of the useful signal to avoid lossCharacter and pattern recognitionAlgorithmStatistical physics
The invention discloses a magnetotelluric signal denoising method and system based on improved multi-scale dispersion entropy, and the magnetotelluric signal denoising method comprises the steps: S1,segmenting a magnetotelluric signal, and respectively extracting the improved multi-scale dispersion entropy of each segment of magnetotelluric signal; S2, performing clustering analysis by utilizingthe improved multi-scale dispersion entropy of each segment of magnetotelluric signal to identify a strong interference signal segment and a low-frequency slow change signal segment; S3, carrying outdenoising on the strong interference signal segment; and S4, combining and splicing the denoised signal segment in the step S3 and the low-frequency slow change signal segment to obtain a reconstructed magnetotelluric signal. According to the magnetotelluric signal denoising method, high-quality magnetotelluric signals can be obtained, and the condition of magnetotelluric low-frequency data loss can be effectively avoided, and the targeted denoising effect is improved.
Owner:CENT SOUTH UNIV
Transmission line carrying capacity calculation method
ActiveCN105676015AReduce calculation biasPracticalElectrical testingTransmission lineCarrying capacity
The invention relates to a method for calculating the ampacity of a power transmission line. The method includes the following steps: selecting two sections of wires of the same type and with the same degree of newness and oldness as reference wires from the power line, the two sections are in the same environmental meteorological parameters, and the directions are parallel. That is, in the same place of sunshine radiation, wind speed and wind direction; the altitudes of the two sections of wires are different; the two sections of wires are equipped with micro-meteorological monitoring devices and wire temperature monitoring devices, so that the two sections of measurement sample wires pass through the same current, through calculation The influence relationship between altitude and temperature rise is obtained, so as to revise the calculation formula of ampacity. Compared with the existing calculation methods, the method is more accurate and practical, has a wide range of applications, and greatly improves the universality of the current carrying capacity calculation.
Owner:STATE GRID CORP OF CHINA +1
Biasing circuit, clock circuit, chip and electronic equipment
PendingCN107248846ASmall voltage fluctuationReduce calculation biasOscillations generatorsPower flowElectrical impedance
The invention relates to the technical field of integrated circuits, in particular to a biasing circuit, a clock circuit, a chip and electronic equipment. The biasing circuit includes an operational circuit used for inputting reference voltage, a first electric current source used for supplying first electric current, a switch circuit, and a compensating circuit which is linked to a first node and used for providing second electric current, wherein the magnitude of third electric current flowing through a zero-temperature coefficient circuit is equal to the sum of the magnitude of the first electric current and the magnitude of the second electric current. Since the reference voltage remains unchanged and the total resistance of the zero-temperature coefficient circuit is out of the influence of temperature and remains unchanged, the third electric current flowing through the zero-temperature coefficient circuit remains the same. Compared with a traditional technique, obviously, the deviation value of calculation can be decreased. Moreover, the compensating circuit can supply the second electric current, obviously, and by the compensation effect of the compensating circuit, the voltage fluctuation of an external power source or the influence caused on the calculation of the first electric current by the resistance interference of the switch can be reduced.
Owner:GREE ELECTRIC APPLIANCES INC
A wind turbine generator cabin cover strength calculation method
PendingCN109446683AReduce calculation biasThe stress is realGeometric CADDesign optimisation/simulationWind forceNacelle
Owner:NANJING ZHONGREN ENERGY TECH
Method and apparatus for determining windward area of power transmission tower
ActiveCN105975697AAvoid double countingReduce biasGeometric CADData processing applicationsEngineeringTower
The invention provides a method and an apparatus for determining a windward area of a power transmission tower. The method comprises a section division step of dividing the power transmission tower into a plurality of tower sections, a rod part windward area coefficient determination step of judging whether each rod part in each tower section bears a windward load or not and is a public rod part or not and determining windward area coefficients of all rod parts in each tower section according to a judgment result, a tower section windward area determination step of determining an actual windward area of each tower section according to the windward area coefficients of all the rod parts in each tower section and theoretical windward areas of all the rod parts, and a power transmission tower windward area determination step of determining a windward area of the power transmission tower according to the actual windward area of each tower section, wherein the public rod part is a rod part which bears the windward load in at least two tower sections. According to the method and apparatus, the calculation is accurate and reliable, the repeated calculation of the windward area is avoided, the deviation of windward area calculation is greatly reduced, and the calculation precision of a wind load stress of the power transmission tower is improved, so that the safety of the power transmission tower is ensured.
Owner:CHINA ELECTRIC POWER RES INST +2
System and method for calculating wind power energy utilization rate
ActiveCN107045548AGuaranteed versatilityMeet customized requirementsData processing applicationsMulti-dimensional databasesDynamoElectricity
The invention discloses a system and a method for calculating a wind power energy utilization rate. The system comprises a real-time database and a historical database, and furthermore comprises a wind power generator state online monitoring module, a wind power generator sample set data processing module, a wind power generator total generation recording service module, a wind power generator index cyclic calculation service module and a user interaction module connected with the real-time database and the historical database. The technical difficult problems of diversified wind power generator types, inconsistent wind power generator state division, low index calculation accuracy and the like during index calculation in current industry can be solved. A sample set frame is introduced and sample effective labeling is judged and processed, so that the calculation error of a single sample is reduced, the problem that theoretical generated energy cannot be calculated due to exception of the single sample is avoided, and the flexibility of calculating indexes of all dimensions is realized. The method is a universal data processing technology for calculating the indexes.
Owner:NR ELECTRIC CO LTD +2
Resistance identification method and system of permanent magnet synchronous motor, medium and terminal
PendingCN113691182AReduce resistance calculation biasImprove accuracy and reliabilityElectronic commutation motor controlAC motor controlPhysicsShaft voltage
The invention provides a resistance identification method and system of a permanent magnet synchronous motor, a medium and a terminal. The method comprises the following steps: inputting a first direct-axis current instruction to the permanent magnet synchronous motor, and obtaining a first direct-axis voltage instruction; inputting a second direct-axis current instruction to the permanent magnet synchronous motor to obtain a second direct-axis voltage instruction; enabling a first preset direct-axis current corresponding to the first direct-axis current instruction to be not equal to a second preset direct-axis current corresponding to the second direct-axis current instruction; and calculating a deviation voltage according to the first direct-axis voltage instruction and the second direct-axis voltage instruction, and calculating the resistance of the permanent magnet synchronous motor based on the deviation voltage. Deviation voltage is introduced, and the resistance identification precision is improved; and before the resistance is identified, the motor rotor is pre-positioned, so that the rotor is blocked, the influence of motor shaking on the resistance identification result in the identification process is avoided, and the accuracy of resistance identification is improved.
Owner:RUKING EMERSON CLIMATE TECH SHANGHAI CO LTD
High-precision detection method and vehicle for track geometric parameters
PendingCN109455197AReduce deviationReduce calculation biasRailway auxillary equipmentRailway profile gaugesData acquisitionEngineering
The invention provides a high-precision detection method and vehicle for track geometric parameters, and belongs to the technical field of data detection. The high-precision detection vehicle for thetrack geometric parameters comprises a vehicle body, a track wheel set, a sensor set, an inclinometer, a data acquisition card, a lithium battery and an industrial personal computer; the vehicle bodycomprises a bottom plate, a bottom bracket, a detection beam, a seat, an equipment placing table and a sun visor, the track wheel set comprises a front track wheel and a rear track wheel, and the sensor set comprises two laser sensors. According to the high-precision detection method for the track geometric parameters, actual geometric parameter data is generated after initial coordinate data is sequentially subjected to filtering processing and error correction processing, filtering processing effectively reduces the interference of the ground and weeds with the initial coordinate data, and therefore the accuracy of the finally-generated geometric parameter data is ensured.
Owner:JINAN UNIVERSITY
Alternating magnetometer verification system and verification method thereof
PendingCN113030828AImprove detection convenienceImprove test efficiencyElectrical measurementsHelmholtz coilEngineering
The invention discloses an alternating magnetometer verification system and a verification method thereof. The verification system comprises an alternating current standard source and a Helmholtz coil. The alternating current standard source is electrically connected with the Helmholtz coil; the verification method comprises the following steps that S1, the computer controls the microprocessor and the FPGA chip to generate alternating voltage; S2, the alternating voltage passes through an isolation transformer to output exciting current, and the exciting current flows into a Helmholtz coil; S3, the Helmholtz coil generates a standard magnetic field, wherein the detected alternating magnetometer transmits reading data to the computer; S4, the exciting current flowing out of the Helmholtz coil is converted into 1V voltage; S5, the 1V voltage is converted and then fed back to the computer; S6, calculating is performed by a computer to obtain a magnetic induction intensity value of the standard magnetic field; and S7, compared the calculated magnetic induction intensity value with the reading data of the detected alternating magnetometer by the computer, and judging and detecting are performed through an error value.
Owner:HENAN PROVINCE INST OF METROLOGY
Harmonic responsibility division method and system
ActiveCN104698273BAccurate calculationInhibition effectSpectral/fourier analysisQuantile regressionPower flow
The present invention relates to a harmonic responsibility division method and system, which collects the harmonic voltage data of the busbar and the harmonic current data of the harmonic source to be obtained on the feeder line; according to the harmonic voltage data and harmonic current data, utilizes the dominant fluctuation amount Calculate the background harmonic impedance using the method; according to the harmonic voltage data, harmonic current data and background harmonic impedance, use the quantile regression method to divide the harmonic responsibility of the harmonic source to be obtained. Use the dominant fluctuation method to estimate the background harmonic impedance, and filter out the dominant fluctuation to calculate the background harmonic impedance, thereby effectively suppressing the influence of background harmonics and measurement noise fluctuations on the background harmonic impedance estimation results, and accurately calculating the background Harmonic impedance; then obtain the background harmonic current according to the background harmonic impedance, and perform quantile regression to obtain the harmonic responsibility of the harmonic source. The calculation deviation caused by the background harmonic fluctuation can be reduced, the division accuracy is improved, and the stability is good, and the data utilization rate is high.
Owner:GUANGZHOU POWER SUPPLY CO LTD +1
Time-varying gain model-based water, energy and carbon coupling numerical simulation method and system
ActiveCN112733385AAchieve balanceSolid physical foundationDesign optimisation/simulationSpecial data processing applicationsCarbon assimilationSoil science
The invention provides a time-varying gain model-based water, energy and carbon coupling numerical simulation method and system. The method comprises the steps of S1, receiving meteorological data and soil vegetation underlying surface type data; s2, initializing the average canopy temperature and the surface temperature in a preset first time period to obtain the net radiation flux of the canopy and the surface; s3, constructing a photosynthesis / stomatal conductance coupling model, and performing vegetation dynamic carbon assimilation simulation; s4, obtaining evapotranspiration parts based on the double-source evapotranspiration model; s5, inputting the evapotranspiration parts, intercepted precipitation and the soil moisture content in the first time period into a time-varying gain runoff production model, and iterating to obtain the soil moisture content; s6, obtaining a canopy, soil latent heat flux, a canopy, soil sensible heat flux and soil heat flux, constructing an energy balance model, and obtaining the average temperature of the canopy. According to the method, the calculation balance of water quantity, energy and carbon flux in a certain period of time can be realized, so that the calculation deviation caused by energy and material imbalance is reduced.
Owner:CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
Metering method for power consumption of multi-connected air conditioner indoor unit
The invention belongs to the field of air conditioners, particularly provides a metering method for the power consumption of a multi-connected air conditioner indoor unit, and aims to solve the problem that an existing metering method is tedious to operate and large in deviation. The metering method comprises the following steps of calculating the real-time power NPim (t=k) of a draught fan of themth indoor unit and the standby power DPm (t=k) of an electric control panel based on running data of the mth indoor unit in the current unit period k; calculating the power consumption parameter NPm(t=k) of the mth indoor unit in the current unit period k based on the real-time power and the standby power; calculating the total power consumption parameter ZNPm (t=k) of the mth indoor unit in the current unit period k based on the power consumption parameter NPm (t=k) in the current period k and the power consumption parameter NPm (t=k-1) in the last unit period (k-1); and calculating the total power consumption ZNPm (t=k) of the mth indoor unit in the current unit period k based on the total power consumption parameter ZNPm (t=k) of the mth indoor unit. According to the metering methodfor power consumption of multi-connected air conditioner indoor unit, methods above are adopted without installing a plurality of electric quantity meters in the multi-connected indoor unit, thus being simple in operation and reducing the metering error.
Owner:QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD +1
Generation cost calculation method, device and storage medium for current markets
InactiveCN108921421AReduce calculation biasImprove power generation efficiencyMarket predictionsResourcesElectricityProgram planning
The invention discloses a generation cost calculation method. The generation cost calculation method comprises the following steps that planned electricity consumption of historical moments is obtained; a historical power generation plan is determined based on predefined generation conditions and the planned electricity consumption; a real-time generation plan of a current day is determined by thehistorical power generation plan; and the generation cost is calculated based on the real-time generation plan and the real-time generation cost. According to the technical scheme, the real-time generation plan of the current day can be determined based on the historical generation plan, and therefore real-time generation is conducted according to daily electricity demand, and generation efficiency of various power plants is improved. The generation cost can be calculated based on the real-time generation cost. Compared with the prior art that the generation cost is calculated by a total power generation plan and the average generation cost, generation cost calculation deviation is reduced. The invention further discloses a generation cost calculation device and a storage medium for current markets.
Owner:GUANGDONG POWER GRID CO LTD +1
Method and device for adjusting boost ratio of power factor correction pfc circuit
ActiveCN104953812BReduce calculation biasFast and accurate voltage control effectEfficient power electronics conversionDc-dc conversionCapacitanceLower limit
Owner:GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
Method and System for Magnetotelluric Signal Denoising Based on Improved Multiscale Dispersion Entropy
ActiveCN111597981BReliable sounding dataImprove data qualityCharacter and pattern recognitionAlgorithmComputer science
The invention discloses a method and system for denoising magnetotelluric signals based on improved multi-scale dispersion entropy. The method includes: step S1: segmenting the magnetotelluric signal, and then extracting the improved multi-scale dispersion entropy of each segment of the magnetotelluric signal ; Step S2: Using the improved multi-scale dispersal entropy of each segment of the magnetotelluric signal to perform cluster analysis to identify the strong interference signal segment and the low-frequency slow-changing signal segment; Step S3: Denoise the strong interference signal segment; Step S4: Merging and splicing the denoised signal segment and the low-frequency slowly changing signal segment in step S3 to obtain the reconstructed magnetotelluric signal. The invention can obtain high-quality magnetotelluric signals, can effectively avoid loss of magnetotelluric low-frequency data, and improves the effect of targeted denoising.
Owner:CENT SOUTH UNIV
Measuring method of power consumption of internal unit of multi-connected air conditioner
The invention belongs to the field of air conditioners, and specifically provides a method for measuring the power consumption of internal units of multi-connected air conditioners. The purpose of the present invention is to solve the problems of cumbersome operation and large deviation in the existing measurement method. The measurement method of the present invention includes: based on the operating data of the m-th internal machine in the current unit time period k, calculate the The real-time power NPi of the fan m(t＝k) And the standby power DP of the electric control board m(t＝k) ;Based on the real-time power and standby power, calculate the power consumption parameter NP of the m-th indoor unit in the current unit time period k m(t＝k) ;Based on the power consumption parameter NP in the current unit time period k m(t＝k) and the total power consumption parameter ZNP in the previous unit time period (k-1) m(t＝k‑1) , calculate the total power consumption parameter ZNP of the m-th indoor unit in the current unit time period k m(t＝k) ;Based on the total power consumption parameter ZNP of the m-th indoor unit m(t＝k) , calculate the total power consumption ZNH of the m-th indoor unit in the current unit time period k m(t＝k) . Through the above method, the multi-connected indoor unit does not need to install multiple electricity meters, the operation is simple, and the measurement error is reduced at the same time.
Owner:QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD +1
A method for detecting printed circuit board defects based on skeleton extraction and distance transformation
ActiveCN103049753BDoes not affect accuracySmall amount of calculationMaterial analysis by optical meansCharacter and pattern recognitionAlgorithmPrinted circuit board
The invention discloses a method for detecting defects of a printed circuit board (PCB) based on skeleton extraction and range conversion. The method comprises the following steps of: checking an index table to extract a single-pixel skeleton; deleting skeleton branches; and searching for range value domain abnormity, and classifying PCB defects according to abnormal conditions. According to the method for detecting defects of the PCB based on skeleton extraction and range conversion, useless points can be deleted on the premise of not influencing the quantity of connected domains by extracting the single-pixel skeleton in a way of checking the index table, and the extracted skeleton is of a single pixel and has high generality and high practicability; skeleton branches are deleted, and range value domain abnormity is searched, so that calculation deviations can be reduced without influencing the speed and accuracy of skeleton tracking; and branches can be deleted, so that the calculation amount of skeleton search is reduced, and the efficiency of defect identification is increased.
Owner:深圳市强华科技发展有限公司
A system and method for calculating the utilization rate of wind power energy
ActiveCN107045548BMeet customized requirementsHave horizontal comparabilityData processing applicationsMulti-dimensional databasesIndustrial engineeringElectric generator
The invention discloses a system and method for calculating the utilization rate of wind power energy, which includes a real-time database and a historical database, and also includes an online monitoring module for the status of a wind power generator connected to the real-time database and the historical database, and a data processing module for a sample group of a wind power generator , wind turbine total power generation recording service module, wind turbine indicator period calculation service module and user interaction module, which can solve the current problems in the industry when calculating this indicator, such as diverse wind turbine models, inconsistent status division of wind turbines, and index Low calculation accuracy and other technical problems. At the same time, the sample group framework introduced by it and the judgment and processing of the effective marks of samples reduce the calculation error of a single sample, avoid the problem that the theoretical power generation cannot be calculated due to the abnormality of a single sample, and realize the flexible calculation of indicators of each dimension It is a general data processing technique for calculating such indicators.
Owner:NR ELECTRIC CO LTD +2
Construction method of engineering construction project safety risk evaluation index system
PendingCN113627739AResolve uncertaintySolve the problem of ambiguityOffice automationResourcesIndex systemNetwork analytics
The invention provides a construction method of an engineering construction project safety risk evaluation index system. According to the invention, engineering construction project accident data is comprehensively collected, an engineering construction project safety accident case library is constructed, and accident cause factors are extracted from the engineering construction project safety accident case library. On the basis, a statistical method is further utilized to screen accident cause factors, key indexes in the accident cause factors are obtained to serve as risk evaluation indexes, and a network analytic hierarchy process based on the minimum deviation principle and a grey correlation method are adopted to carry out combined weighting on the risk evaluation indexes. The problem of subjective judgment of evaluation personnel is solved, and the problems of uncertainty and fuzziness of evaluation indexes are also solved, so that a representative engineering construction project safety risk evaluation index system is constructed, and the engineering construction project safety risk evaluation index system has important significance for safety risk evaluation of engineering construction projects.
Owner:宁夏建设投资集团有限公司
An imaging method, device and mobile terminal
ActiveCN107483777BReduce thicknessLow costTelevision system detailsColor television detailsCamera lensRadiology
Owner:上海欧计斯软件有限公司
HPLC-HG-AFS data processing method based on theory and difference algorithms of system model
InactiveCN104569235ASmear suppressionReduce calculation biasComponent separationDifferential algorithmFluorescence
The invention discloses an HPLC-HG-AFS data processing method based on theory and difference algorithms of a system model. The method comprises the following steps: 1 denoising and fitting original fluorescence data collected by an HPLC-HG-AFS system; and 2 executing the difference algorithm to obtain a recombined spectrogram. The differenced spectrogram is obtained after the difference algorithm is carried out once; and a primary difference algorithm is applied to the spectrogram again to obtain a secondary difference algorithm. Compared with the prior art, the fitting error can be reduced; the separation degree is improved; the linearity of a standard curve is improved; and the measurement deviation of intercept and slope of the standard curve is reduced.
Owner:TIANJIN UNIV
An automatic measuring device for fishing boat inclination test
ActiveCN107745783BReduce calculation biasReduce experimental errorTransmission systemsVessel designingSource Data VerificationMarine engineering
The invention provides automatic measuring equipment for an inclining test of a fishing boat. The automatic measuring equipment comprises a folded shrinkable support module, a signal acquisition module, a remote control module and a trough. An acceleration sensor tests the gravity acceleration of a pendulum in different states; a displacement sensor tests the swing amplitude of the pendulum; the signal acquisition module stores and operates the pendulum test data; and a low-power-consumption WIFI module sends the test data to a PC terminal or mobile phone terminal APP, and the PC terminal or mobile phone terminal APP receives the data and performs data verification to generate an inclining test report, thereby integrating a process test. Test errors caused by manual reading are reduced, the test accuracy is improved, and the automatic measuring equipment with an integrated folded shrinkable structure is convenient to carry and use.
Owner:FISHERY MACHINERY & INSTR RES INST CHINESE ACADEMY OF FISHERY SCI
Equipment and method for measuring iron loss of high-speed permanent magnet motor
PendingCN114487823AReduce calculation biasReduce the impactThermometer applicationsDevices using electric/magnetic meansElectric machineDrive motor
The invention discloses equipment for measuring iron loss of a high-speed permanent magnet motor. The equipment comprises a driving motor, a motor to be measured, a non-contact sensor and a temperature sensor. Wherein the driving motor comprises a shaft and a stator, the shaft rotates around the axis, and a winding is arranged on the stator. The to-be-tested motor comprises an unmagnetized first permanent magnet, and the to-be-tested motor and the driving motor are coaxially arranged. The non-contact sensor can measure the rotating speed of the shaft without contacting the shaft. The temperature sensor is arranged on the stator and used for measuring the temperature of the winding. The iron loss of the to-be-tested motor is calculated by controlling whether the first permanent magnet is magnetized or not, controlling the rotating speed of the shaft to be constant, recording the input power difference value of the driving motor before and after the first permanent magnet is magnetized, and recording the temperature difference value of the winding. The method mainly solves the problem that a traditional method for measuring the iron loss of the high-speed permanent magnet motor lacks consideration of copper loss and lacks control variables.
Owner:ZHEJIANG UNIV
Total power generation cost optimization accounting method
PendingCN111369061AImprove power generation efficiencyReduce calculation biasMarket predictionsForecastingGenerating capacityElectric heating
The invention discloses a total power generation cost optimization accounting method, and relates to the technical field of power grid planning. In order to solve the deviation problem of power generation cost calculation, the method specifically comprises the following steps: collecting power generation fuel quantity of a generator set in a power plant in real time; obtaining the power consumption at each moment before the day; determining whether the power consumption at each moment before the day exceeds a threshold value or not; according to the collected power generation fuel quantity andthe heat value corresponding to the power generation fuel quantity, the current power generation quantity of the power plant is calculated; and determining a day-ahead power generation plan accordingto a predetermined power generation condition and the power consumption at each moment. Compared with the mode of calculating the power generation cost through the total power generation plan and theaverage power generation cost, the calculation deviation of the power generation cost is reduced; the method can achieve the reasonable overall planning of the in-furnace fuel quantity, the reasonable distribution of the steam quantity and electric heating load of the generator set, and the precise scheduling, enables a power plant to always operate at an optimal economic point, and achieves theenergy-saving purpose of the power plant.
Owner:CHINA SOUTHERN POWER GRID COMPANY
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