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Method for calculating staged fracturing productivity of compact reservoir horizontal well
ActiveCN105840187ACalculations are reliableGood application effectInformaticsSpecial data processing applicationsBottom hole pressureMultiple fracture
The invention relates to the technical field of oil fracturing, in particular to a method for calculating the staged fracturing productivity of a compact reservoir horizontal well. The method is characterized by including the steps of firstly, dividing a reservoir infiltration area into four parts; secondly, obtaining the equivalent hole diameter of each fracture; thirdly, obtaining the yield of each fracture during multiple fracture disturbance; fourthly, coupling the yield of each fracture with the hydraulic pressure drop flow model in a horizontal wellbore to obtain a group of bottom hole pressure, iteratively solving until the bottom hole pressure difference of the previous step and the next step is smaller than tolerance, namely convergence, and taking the determined group of yield as the fracture-control yield of each fracture and the sum of the fracture-control yield of the fractures as the total yield of the horizontal well. The method is real and reliable in calculation result and good in application effect.
Owner:RES INST OF SHAANXI YANCHANG PETROLEUM GRP
Method for predicting evolvement and performances of structure of strip steels in hot rolled proces
InactiveCN1431060AThe calculation result is accurateCalculations are reliableRoll mill control devicesMetal rolling arrangementsStrip steelPhase change
A method for predicting the structure variation and properties of band steel in hot rolling procedure features that its system is composed of the preprocessing module for reading the technological parameters needed by hot rolling from database, the heating module, rolling module, cooling phase-change module and mechanical performance module for simulating the hot rolling procedure and predicting the final structure performance, and the post-precessing module for displaying the final result.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Method for detecting hydrostatic pressure of thin-wall steel pipe under end face seal condition
InactiveCN102042935AEasy to calculateCalculations are reliableMaterial strength using tensile/compressive forcesPore water pressureInlet valve
The invention relates to a method for detecting the hydrostatic pressure of a thin-wall steel pipe under the end face seal condition. Used equipment is an end face seal steel pipe hydrostatic pressure testing machine which comprises a testing machine body, a hydraulic system, a water pressure system and an electric control system. The method for detecting the hydrostatic pressure of the thin-wall steel pipe under the end face seal condition comprises the following steps of: 1) feeding the pipe and pre-clamping, namely respectively sealing the two pipe orifices of the pressure test thin-wall steel pipe by using two seal flat gaskets on a main pressure test head body and an auxiliary pressure test head body; 2) filling water, namely filling low-pressure water into the pressure test thin-wall steel pipe, exhausting, and closing a low-pressure water inlet valve, an exhaust port and a pressure relief port; 3) pressurizing, namely supplementing the water to the pressure test thin-wall steel pipe for pressurizing, pressurizing a main hydraulic cylinder synchronously, and determining a test pressure value according to a calculation formula; 4) stabilizing pressure, namely after the pressure of the water in the pressure test thin-wall steel pipe reaches a specified test pressure value, stabilizing the pressure until time specified by the test is up; and 5) relieving the pressure and discharging the water and the pipe. The detection method overcomes the defects of the conventional pipe making specifications, and the calculation process is simple, convenient and reliable.
Owner:马利芳
Three-dimensional seismic fragility analysis method for bridge structure
ActiveCN106897510ACalculation results are accurate and reliableImplement vulnerability assessmentSpecial data processing applicationsInformaticsKnowledge FieldAnalysis method
The invention discloses a three-dimensional seismic fragility analysis method for a bridge structure. The method aims at the condition that a common seismic fragility calculation method cannot be used for carrying out three-dimensional seismic fragility calculation at present. According to the method, damage state equations used for assessing seismic damage of bridge members under a three-dimensional seismic effect is proposed firstly; for calculating damage probabilities of the members, a three-dimensional seismic fragility calculation theory of the bridge structure is detailedly derived and established by applying an engineering structure reliability theory, a probability theory and a mathematical statistics method according to characteristics of the damage state equations; and on the basis of fully considering parameter uncertainty of the bridge structure and uncertainty of seismic oscillation, an incremental dynamic analysis method and a finite element method are introduced. According to the analysis method, a derivation process has a better theoretical basis, and a calculation result is more accurate and reliable; and the method makes a breakthrough progress in the field of fragility research, and one-dimensional seismic fragility analysis is upgraded to three-dimensional seismic fragility analysis in existing research field, so that fragility assessment of the bridge structure under the three-dimensional seismic effect is realized.
Owner:SOUTHWEST JIAOTONG UNIV
Star map data based method for measurement of in-orbit precision of star sensor
ActiveCN105371870AImprove real-time performanceReduce mistakesMeasurement devicesBack calculationAngular degrees
A star map data based method for measurement of in-orbit precision of a star sensor. The single-frame static star map data obtained by the star sensor is utilized for measure the key performances such as in-orbit pointing accuracy and viewing angle of the star sensor; a quaternion estimation algorithm (QUEST), which converts the eigenvalue solution into the solution of a root of a fourth-order equation to speed up, is employed to obtain an optimal attitude matrix Aq; then according to the attitude matrix Aq and the identified n navigational stars, conducting back calculation to obtain the theoretical position of each navigational star on the image sensor, wherein the theoretical position is the theoretical point of intersection (xit, yit) of the primary optical axis of the star sensor and the interface; calculating the errors between the theoretical positions of the star points (xit, yit) and the measured actual positions of star points, wherein the actual star point position is the actual point of intersection (xi, yi) of the primary optical axis of the star sensor and the interface; and calculating a mean value of the errors and converting the mean value to an equivalent angle value, so as to obtain the precision of the star sensor. Compared to the commonly used in-orbit comparison method, the method provided by the invention eliminates the influence of the errors of time alignment and installation matrix between the star sensors, and reaches higher measurement accuracy.
Owner:BEIJING INST OF SPACECRAFT SYST ENG
Directional application method based on user gender distinguished results and system thereof
InactiveCN103164470AIncrease coverageImprove the efficiency of personalization applicationsSpecial data processing applicationsPersonalizationInternet users
The invention discloses a directional application method based on user gender distinguished results and a system thereof. A relationship of gender inclination and behavior data is calculated and obtained through behavior data and genders of sample users, and then the gender inclination of all users can be obtained according to the collected behavior data of all users and the relationship of the gender inclination and the behavior data. Real, impersonal and complete behavior data of the users is used for distinguishing internet user gender, and calculated results are accurate and reliable. Under the conditions that real gender information of the users is lost and false, accurate user gender information can be obtained. The directional application method based on the user gender distinguished results and the system enable accurate rates and efficiency of directional application to be greatly improved, wherein the directional application such as individuation search, individuation recommendation and advertisement targeted delivery is based on different genders of the users, and efficiency of internet individuation application can be improved.
Owner:SHENGQU INFORMATION TECH SHANGHAI
Full-automatic test system and measurement method for gas permeability of rock
ActiveCN105675469ASatisfy Penetration Testing RequirementsIncreased Osmotic Stress Test CoveragePermeability/surface area analysisData acquisitionRock sample
The invention discloses a full-automatic test system and measurement method for gas permeability of rock and belongs to the test system and method for the gas permeability of the rock. A to-be-tested core is placed in a three-axis core clamping device, confining pressure is loaded in the circumferential direction of the to-be-tested core through a confining pressure loading system, axial load is loaded in the axial direction of the to-be-tested core through the confining pressure loading system, gas seepage pressure is loaded at the left end of the to-be-tested core through a seepage gas boosting system, the right end of the to-be-tested core is communicated with the atmosphere through a high outlet gas flowmeter, a medium outlet gas flowmeter and a low outlet gas flowmeter, and the permeability of the to-be-tested core is obtained through automatic calculation of data acquisition and processing software. The confining pressure, the axial load and the gas seepage pressure of a rock sample can be adjusted independently, and with adoption of the test system, stable values of the gas permeability of rock samples with high permeability, medium permeability and low permeability can be calculated and stored automatically. The full-automatic test system and measurement method for the gas permeability of the rock can precisely and reasonably analyze the law of the influence of the confining pressure, the axial load and the seepage pressure on the rock permeability.
Owner:CHINA UNIV OF MINING & TECH
Method and device for determining water saturation of stratum
ActiveCN103422853AGood correlationGood application effectBorehole/well accessoriesPetroleumFunctional relation
The invention discloses a method and a device for determining the water saturation of a stratum, and belongs to the field of oil well logging technologies. The method includes selecting series representative cores of a measured region, and measuring values of porosities POR of the series cores and values of specific resistance R<w> of saturated stratum water of the cores; creating a functional relation m(POR, R<w>) among bond indexes m of the cores, the porosities POR of the cores and the specific resistance R<w> of the stratum water; creating a functional relation n(R<w>, POR) among saturation indexes n, the porosities POR of the cores and the specific resistance R<w> of the stratum water; solving the water saturation S<w> of the stratum by the aid of an Archie water saturation interpretation model. The device comprises a selecting module, a parameter measuring module, a bond index creating module, a saturation index creating module and a saturation computing module. The method and the device have the advantages that the functional relations among values of the bond indexes m, values of the saturation indexes n, the porosities POR and the specific resistance R<w> of the stratum water are created, so that the values of the bond indexes m, the values of the saturation indexes n, the porosities POR and the specific resistance R<w> of the stratum water are relevant to one another, and the computed water saturation of the stratum is accurate and reliable.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Calculation method for dynamic reserves of gas reservoir
ActiveCN108612525ACalculations are reliableEasy and accurate calculationBorehole/well accessoriesTransition stageControl flow
The invention discloses a calculation method for dynamic reserves of gas reservoir. The calculation method aiming at solving the problems that an existing gas reservoir dynamic reserve calculation method is lack of information, harsh in use conditions or complicated in analysis process, the calculation method is based on the advantages of a material balance method and is combined with the gas seepage process, a vertical pipe flow model, a gas well productivity equation and a material balance equation. The calculation method comprises the following steps that S1, production dynamic data are prepared; S2, the bottom hole flowing pressure is calculated, specifically, the bottom hole flowing pressure of a gas well is calculated according to the processed production dynamic data of the gas well; S3, the formation static pressure is calculated, specifically, a binomial deliverability equation of the gas well is adopted to calculate the average formation pressure of the gas well; S4, flow stages are divided, specifically, a boundary control flow stage, an unstable flow stage and a transition stage are determined; and S5, the dynamic reserves are calculated, specifically, the dynamic reserves after the unstable flow stage of the gas well is finished is calculated, and the dynamic reserves is added to the cumulative gas production in the unstable flow stage to get the true dynamic reserves of the gas well.
Owner:CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
Method for computing electromagnetic force of transformer iron core based on finite element method
InactiveCN106570218ACalculation method directlyCalculation method is simpleDesign optimisation/simulationSpecial data processing applicationsTransformerLow voltage
The invention discloses a method for computing electromagnetic force of a transformer iron core based on a finite element method. The method comprises the steps that structural parameters of a winding, the iron core and a fuel tank of a transformer are collected, and then a three-dimensional geometric grid model of the transformer is established; the three-dimensional geometric grid model is input into software, sinusoidal currents with a phase different of 120 DEG are applied to the cross section of the three-phase low voltage winding respectively, and Dirichlet boundary conditions are applied to the outer side of the structural grid model; and an instant electromagnetic field is solved by a virtual displacement method, magnetic field energy is computed, a virtual work method is used to compute instant electromagnetic force borne by the transformer iron core and the winding, FFT is conducted to the instant electromagnetic force, and frequency domain distribution of the electromagnetic force of the iron core can be obtained. The computation method disclosed by the invention is direct and convenient; electromagnetic vibration and force bearing situations of the transformer iron core can be analyzed from the perspective of energy; each influential factor on force bearing of the iron core is considered comprehensively; and computation results are accurate and reliable.
Owner:CHINA ELECTRIC POWER RES INST +1
Method for determining full-field-of-view apparent spectral radiance of satellite-borne optical remote sensor
ActiveCN104573251AEliminate simplificationEliminate approximate calculationsSpecial data processing applicationsRadianceRadiative transfer theory
The invention discloses a method for determining full-field-of-view apparent spectral radiance of a satellite-borne optical remote sensor. The method comprises the steps that firstly, an optical remote sensing satellite observation model and a scene are simulated, a satellite remote sensor model, an observation object, a satellite orbit and an attitude parameter are set, and the scene is restrained; secondly, an optical remote sensing satellite full-field-of-view observation parameter is calculated; finally, the optical remote sensing satellite full-field-of-view apparent spectral radiance is determined. According to the method, determination of the apparent spectral radiance received by the remote sensor is based on a radiation transfer theory, and simulation is conducted on the whole radiation transfer link including the earth, a ground object target, the background characteristics, the atmospheric conditions and the satellite-borne optical remote sensor according to the operating characteristics of a satellite platform and the remote sensor; the apparent spectral radiance received by the view field positions corresponding to pixels at different positions of the focal plane of the remote sensor is determined according to the pixels one by one through radiation transfer model software.
Owner:AEROSPACE DONGFANGHONG SATELLITE
Website user rank division method
InactiveCN101477552ADescribe the grade objectivelyData cleanSpecial data processing applicationsCluster algorithmWeb site
The invention relates to a method of classifying and dividing users used in an Internet website, which comprises the following steps: (1) access records are filtered and the influence of spider access and artificial attack access is eliminated at first; (2) access browsing times in a certain time P, access times S and total length of access duration time T for each user are calculated, so as to form a three-dimensional clustering space P, S and T; and (3) classification grades of users are confirmed through the clustering calculation for users. The invention breaks through a classical cluster algorithm algorithmically, does not need class-center conversion, and achieves the clustering at a time; in addition, the division method is ingenious and succinct, the computation amount is greatly reduced, the calculation speed is enhanced, and the interpretability and the practicability are very strong.
Owner:辽宁般若网络科技有限公司
Method for determining characteristic stress in rock material damage evolution process based on energy analysis
InactiveCN110296892ACalculations are reliableEasy to operateWithdrawing sample devicesPreparing sample for investigationCrack closureStress–strain curve
The invention discloses a method for determining characteristic stress in a rock material damage evolution process based on energy analysis, and mainly relates to crack closure stress, initiation stress and damage stress in the rock material damage evolution. The minimum value of the energy consumption ratio on the energy consumption ratio-axial strain curve is taken as a first point to draw a vertical line 1, and the rock damage stress can be found on the outer envelope line of the axial stress-strain curve; a straight line 1 is drawn from the point to the upper left along the energy consumption ratio-axial strain curve, a vertical line 2 is drawn at the position where the straight line 1 deviates from the energy consumption ratio-axial strain curve, and the intersection point on the corresponding axial stress-strain curve outer envelope line is the rock initiation stress; and the rock initiation stress is taken as a second point along the axial stress-strain curve outer envelope lineto draw a straight line 2, the straight line 2 is drawn towards the origin of coordinates, the position which deviates from the axial stress- strain curve outer envelope line is the rock crack closure stress. The method for determining characteristic stress in the rock material damage evolution process based on energy analysis has strong operability, further reduces human subjectivity; and the method for determining characteristic stress in the rock material damage evolution process based on energy analysis is more advantageous in terms of operation process and determination of the amount ofcharacteristic stress.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
Equivalent simulation calculation modeling method for modularized multi-level converter
ActiveCN103593520AFast simulation calculationCalculations are reliableSpecial data processing applicationsTransient stateElectricity
The invention relates to an equivalent simulation calculation modeling method for a modularized multi-level converter. The modularized multi-level converter is composed of six bridge arms. Every two bridge arms form a phase unit. Each bridge arm is formed by connecting a cascade sub-module and a bridge arm reactance L in series. Each sub-module comprises an insulation gate double-pole thyristor IGBT1, an insulation gate double-pole thyristor IGBT2, a diode D1, a diode D2 and a capacitor C. Each insulation gate double-pole thyristor and one diode are connected in an anti-parallel mode for forming a switching component branch. According to the equivalent simulation calculation modeling method, equivalence is carried out on the sub-modules of the modularized multi-level converter and Dommel equivalent calculation models for the bridge arms, and additional switching component processing is adopted for solving the problem that the switching-on state of a switch tube changes during two simulation moments in the locking phase of the modularized multi-level converter. According to the modeling method, the calculation amount in the simulation operation can be reduced by reducing the number of variable impedance branches in the electromagnetic transient simulation calculation, and therefore simulation of the modularized multi-level converter is efficient, and the calculation result is stable and reliable.
Owner:ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
Stable, real-time and emergent voltage and power angle control method based on response message
ActiveCN103532147AImprove the level of safe and stable operationRich security and stability defense systemPower network operation systems integrationAc network voltage adjustmentLoad SheddingEngineering
The invention provides a stable, real-time and emergent voltage and power angle control method based on a response message. The method comprises steps as follows: step 1, a power angle quantity and a rotation speed quantity of an electric generator in an electrical power system as well as voltage and current amount of an important load bus of a receiving system are acquired in real time; step 2, power angle stability and voltage stability of the system are monitored in parallel simultaneously, the step 3 is executed when the system loses the power angle stability, the step 4 is executed when the system loses voltage stability, and the step 1 is executed when the system is stable; step 3, a retardation area Sc which should be increased to the system is calculated by utilizing a fit power characteristic curve, a generator-shedding measurement amount is determined, and the step 1 is executed; and step 4, the bus voltage amplitude is used as an evidence for judging the severity of voltage instability, the bus load shedding amount is determined according to the difference of the severity of voltage instability, and the step 1 is executed. The provided real-time and emergency control method adopts a parallel judgment manner, so that a stable, real-time and emergency control scheme of voltage and the power angle of an electrical power system is constructed.
Owner:STATE GRID CORP OF CHINA +1
Contour registration method used in train guide rail contour measurement based on machine vision
InactiveCN104296682AThe registration result is accurateEasy to observeUsing optical meansRail profileMachine vision
The invention discloses a contour registration method used in train guide rail contour measurement based on machine vision. Contour measurement comprises the first step of collecting steel rail images, the second step of obtaining a single-pixel curved line of a steel rail profile through computer processing, the third step of carrying out calibration restoring and the fourth step of carrying out contour registration. The contour registration method comprises the steps of enabling an actual contour line and a standard contour line to be unified in a coordinate system and utilizing asymptotic lines of the two contour lines to obtain an included angle between the actual contour line and the standard contour line, rotating the actual contour line and enabling the asymptotic lines of the two contour lines to be paralleled, and horizontally moving the actual contour line and enabling ends of the actual contour line to be coincident with ends of the standard contour line. According to the contour registration method, the actual contour line and the standard contour line are unified into the coordinate system and the actual contour line is processed, the asymptotic lines of the actual contour line and the standard contour line are paralleled and coincide at ends, and therefore the registration result is accurate, observation and calculation are carried out conveniently and reliable abrasion loss data can be achieved.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA
Method for judging icing instability of tension support of power transmission line
ActiveCN107657090ACalculations are reliableEase of evaluationDesign optimisation/simulationResourcesPull forceInstability
The invention discloses a method for judging the icing instability of a tension support of a power transmission line. The method comprises the following steps that: S1: establishing a pole and tower finite element mechanical analysis fine numerical simulation model; S2: solving and calculating the force direction and the change amount of an insulator string mount point before and after the pole and tower is iced; S2: carrying out finite element numerical calculation; S4: considering an influence of practical uneven icing of two sides of a tension support structure, and making an pole and towerinstability curve; and S5: according to the tension or icing thickness practicality of the mount point under an icing condition, judging a current power transmission line pole and tower instability situation. By use of the method, the real-time tension of the insulator string mount point, finite element situation calculation is adopted to researching the influence of the icing on the pole and tower instability, calculation efficiency can be effectively improved, a finite element calculation result is more reliable, and power grid maintenance personnel can conveniently and directly evaluate the pole and tower stability on the basis of the monitoring situation of the insulator string tension of two sides of the pole and tower.
Owner:EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
Method of quantitatively restoring maximum paleo-water depth of lake basin through seismic profiling
InactiveCN106094030ACalculations are reliableUniqueness guaranteedSeismic signal processingTotal thicknessArenite
The invention discloses a method of quantitatively restoring the maximum paleo-water depth of a lake basin through seismic profiling, comprising the following steps: (1) a 3D seismic profile deltaic progradational reflection configuration is found, and the top interface time t1 and the bottom interface time t2 are calibrated; (2) the top interface time and the bottom interface time are converted into corresponding top and bottom interface depth H1 and H2 through a time depth conversion scale; (3) the average sandstone thickness h1 and the average mudstone thickness h2 in a 3D seismic profile progradational layer are calculated; (4) the sandstone compaction rate K1 and the mudstone compaction rate K2 are obtained using a graphical method or an experimental method; and (5) before compaction, the sandstone thickness h10=h1 / (1-K1), the mudstone thickness h20=h2 / (1-K2), and the total thickness of the formation before compaction h0=h10+h20, namely, in the delta sedimentation period, the paleo-water depth thickness of the lake basin is h0, and the maximum paleo-water depth h of the lake basin at the moment is greater than or equal to h0. Through the method, the maximum paleo-water depth of a continental lake basin in the geological history period can be restored quantitatively, and the calculation result is real and reliable and is unique.
Owner:QINGDAO INST OF MARINE GEOLOGY
Efficient simulation modeling method for full-bridge cascading type multi-level converter
ActiveCN103593521AFast simulation calculationCalculations are reliableSpecial data processing applicationsTransient stateFull bridge
The invention relates to an efficient simulation modeling method for a full-bridge cascading type multi-level converter, and belongs to the technical field of power transmission and distribution. The efficient simulation modeling method is characterized in that equivalence is carried out on a sub-module of the full-bridge cascading type multi-level converter and a Dommel equivalent calculation model for a bridge arm, and the problem that in the locking stage of the full-bridge cascading type multi-level converter, a switch tube conducting state changes during two simulation moments is processed by adding a switch element. Due to the fact that the calculated quantity in simulation operation is reduced by reducing the number of variable impedance circuit braches in electromagnetic transient simulation software, the efficient simulation of the full-bridge cascading type multi-level converter is achieved. The efficient simulation modeling method is clear in principle, and stable and reliable in calculation result.
Owner:ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
New energy automobile charging residual time estimation method
PendingCN110562097AFeel goodAccurate and reliable charging timeVehicular energy storageBattery/fuel cell control arrangementElectricityEstimation methods
The invention discloses a new energy automobile charging residual time estimation method. The method comprises the following steps of 1, divide the charging process from 0% to 100% of battery charginginto n charging stages according to the sequence before and after charging through an electric quantity percentage node, the electric quantity percentage node comprises SOC1, SOC2, SOC3... SOCn withthe electric quantity percentage value increasing in sequence; 2, calculate the charging time corresponding to each charging stage in the n stages respectively; 3, acquire the SOC of the current battery, comparing the SOC with each power percentage node respectively, and judge the charging stage at this time; 4, calculate the time T from the charging of the percentage of electricity SOC to the endof the charging phase and obtain the time of each subsequent charging phase of the current charging phase; and 5, add the time T and the time of each subsequent charging stage in the current chargingstage to obtain the estimated remaining charging time.
Owner:WUHU HONGJING ELECTRONICS
Shield general segment assembling point location determining method
ActiveCN107725067AThe method steps are simpleLow input costUnderground chambersResourcesWeight coefficientEngineering
Owner:CHINA RAILWAY FIRST GRP CO LTD +1
Predication method of organic holes of different types of clay shale
InactiveCN104697914AHigh precisionCalculations are reliablePermeability/surface area analysisSpecial data processing applicationsPredictive methodsQuantitative expression
The invention relates to a predication method of organic holes of different types of clay shale. The method comprises the steps of building a conceptual model and predication model for organic carbon recovery coefficients of organic matters of different types of clay shale; calculating original organic carbon, organic carbon discharged during producing hydrocarbon, and residual organic carbon after discharging hydrocarbon so as to predicate original organic down holes, formed organic down holes and organic down holes without being formed at present; predicating the currently formed actual organic holes and the organic holes lost in compressing of the clay shale after compressing and calibrating. According to the method, the models are built to predicate the original organic down holes, the formed organic down holes, the organic down holes without being formed at present, the currently formed actual organic holes and the organic hole lost in the compressing of the clay shale after compressing and calibrating; therefore, the precision is high; the calculation result is reliable; the basis is provided to accurately evaluate the size of the organic holes, in particular quantitatively evaluate the heterogeneity distribution evolution of the organic holes in different clay shale; the method is of important significance in study on the general oil and gas storage mechanisms of the clay shale, the quantitative expression of heterogeneity of oil-gas containing property of the clay shale, and evaluation of the oil-gas resource of abnormal clay shale.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Robot tail end multi-target position and pose approach method based on joint angle compensation
ActiveCN111409077ASolve the problem of low accuracy of pose approximationEasy searchProgramme-controlled manipulatorControl systemJoints movement
The invention discloses a robot tail end multi-target position and pose approach method based on joint angle compensation. The method comprises the steps that when target values of all joint angles are determined according to nominal values of geometric parameters of a robot, and all joints of the robot are controlled to move to the target values of all the joint angles, geometric parameter errorsof the robot are identified according to the acquired measured data values of robot tail end position and pose, the identified geometric parameter errors of the robot are converted into correction values of all the joint angles of the robot, and the correction values, of the joint angles, obtained through conversion are combined to calculate to obtain compensation values, of the joint angles, forcontrolling the robot to execute the multi-target position and pose approach action. According to the method, the compensation values of the joint angles can be used for replacing the compensation ofthe geometric parameter errors to control the robot to move, so that the problem that a robot control system is closed or semi-closed, and a user cannot directly compensate the geometric parameter errors obtained through identification is solved, and the precision and efficiency of the robot tail end absolute position and pose are effectively improved.
Owner:NANJING INST OF TECH
Method for determining lower open-off cut positions of shallow-buried short-distance goaf-side coal pillars
InactiveCN104074520ACalculations are reliablePracticalUnderground miningSurface miningShortest distanceCoal pillar
The invention provides a method for determining lower open-off cut positions of shallow-buried short-distance goaf-side coal pillars. According to the method, firstly, drillhole column data near the overlying goaf-side coal pillars corresponding to open-off cuts to be arranged is collected; then, according to the collected data, key layer identifying software is adopted for identifying overlying strata key layer positions under the concrete drillhole column conditions; and finally, according to the occurrence conditions of the key layers between an upper coal bed and a lower coal bed, the lower coal bed open-off cut position determination is carried out according to respective corresponding methods. The method provided by the invention is used for roof plate press frame disaster prevention and control practice during the short-distance coal bed repeated exploitation in a coal mine production process, and has high reliability and practicability.
Owner:CHINA UNIV OF MINING & TECH
Method for obtaining satellite solar angle and time on basis of satellite orbit characteristics
ActiveCN104833335AEasy accessThe calculation result is accurateAngle measurementNatural satelliteLongitude
A method for obtaining satellite solar angle and time on the basis of satellite orbit characteristics comprises the following steps: (1) according to the satellite sun-synchronous orbit characteristics, calculating the orbit inclination angle from the height of the satellite orbit; (2) according to the number of satellite orbits, calculating the longitude and Beijing time of sub-satellite point of the position where a satellite descending orbit intersects the equator, and converting the Beijing time into the local time so as to obtain the time of the position; (3) calculating to obtain the local times of any latitude where the satellite sub-satellite point pass; (4) according to the orbit injection error of satellite orbit inclination angle and the daily change rate of satellite orbit inclination angle during the operation process, calculating to obtain the change of satellite local time and actual local times of any latitude; (5) calculating to obtain the actual local time after satellite side-sway; (6) calculating to obtain the solar altitude, solar azimuth, and the Beijing time of an observation site. The provided method can precisely obtain the solar altitude, solar azimuth, and imaging time of a satellite according to a remote sensing satellite nominal orbit and changes thereof without knowing the satellite ephemeris data and specific imaging time.
Owner:CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
Transforming plant distributed state estimation method based on Kirchhoff's current law
InactiveCN101499659AReliable calculationCalculations are reliableCurrent/voltage measurementSpecial data processing applicationsElectric power systemEstimation methods
The invention relates to a substation distribution-typed state estimation method based on a Kirchhoff current law, belonging to the field of running and control technology of the power system. The method comprises the steps as follows: firstly, measurement and collection are carried out; subsequently, zero impedance current state estimation is carried out to the collected current value; and then according to the current estimation value, the identification of the analog quantity bad data and topology error identification are respectively carried out; the quantity measurement after the bad data is deleted is used for carrying out the zero impedance current state estimation; and after the topology analysis, the zero impedance voltage state estimation is carried out to the obtained bus model. The method has the advantages of reliable and quick calculation, providing the estimation solution of complex current and complex voltage of the substation for a control center, leading the state estimation of the control center not to need to find the topology error and the bad data or to be iterated, and achieving the objects of reliable calculation results, high calculation efficiency, high robust, strong self-curing, reducing the working quantity of system maintenance, and the like.
Owner:TSINGHUA UNIV
Method for measuring residue stress and metal material elastic-plastic mechanical property by continuous press mark method
InactiveCN108387470AConvenient and accurate simulationImprove experimental efficiencyGeometric CADDesign optimisation/simulationReverse analysisTest sample
The invention discloses a method for measuring the residue stress and metal material elastic-plastic mechanical property by a continuous press mark method. The residue stress is simulated by exertingtransverse load onto a test sample without residue stress; continuous ball press mark experiments are performed; a dimensionless function expression between the press mark power ratio and the metal material mechanical property at different depth is built; the press mark experiment is performed on materials to be tested; the real press mark power ratio is obtained from a load-displacement curve; bya reverse analysis solving method, three groups of different press-in depths or more are selected so that the total sum of the error absolute value between the inversion press mark power ratio and the real press mark power ratio is minimum; at the moment, the values of the yield strength, residue stress and strain hardening indexes are solved values.
Owner:NANJING UNIV OF TECH
Image restoring method in train guiderail contour measurement based on machine vision
InactiveCN105004280ARemove distortionCalculations are reliableUsing optical meansMachine visionThree-dimensional space
The invention discloses an image restoring method in train guiderail contour measurement based on machine vision. The image restoring method comprises the steps of S1, placing a calibration plate, namely placing the calibration plate on a train guiderail so that a laser irradiates the surface of the to-be-detected train guiderail for forming a thin and narrow light stripe, arranging the calibration plate on the light stripe so that the calibration plate is superposed with the stripe of the light stripe; S2, obtaining a calibration image, namely connecting with a CCD image camera, and obtaining a section contour image of the train guiderail under laser irradiation when the image of the calibration plate in a laser plane appears in a viewing window; and S3. performing calibration restoring on an obtained single-pixel curve for obtaining the actual contour of the train guiderail. According to the image restoring method, calibration restoring processing is performed on the contour; and the information of an image in an actual three-dimensional space is restored according to a two-dimensional image model which is acquired by the CCD image camera through computing, thereby eliminating distortions, restoring the actual contour and making a computing result more accurate and more reliable.
Owner:成都多极子科技有限公司
Method for determining unfrozen water content of frozen soil through measuring electrical resistivity
ActiveCN106872529AEasy to calculateSimple and fast operationEarth material testingMaterial resistanceElectrical resistance and conductanceSoil science
The invention provides a method for determining unfrozen water content of frozen soil through measuring electrical resistivity. The method comprises the following steps: preparing a cylindrical saturated soil sample by utilizing a PVC (Polyvinyl Chloride) plastic pipe; respectively determining the volumes of soil particles and pore water in the saturated soil sample; determining cross sectional areas of the soil particles and the pore water in the saturated soil sample; freezing the saturated soil sample in a low-temperature test box, uniformly smearing the upper and lower circular surfaces of the cylindrical saturated soil sample, and measuring the resistance of the cylindrical saturated soil sample by using a multi-meter; calculating the electrical resistivity of the saturated soil sample at each temperature; drying the determined saturated soil sample in a drying box, determining the resistance of the dried saturated sample soil, and calculating the electrical resistivity of the dried saturated soil sample; calculating the volume of the unfrozen water of the saturated soil sample until the unfrozen water content is calculated. The method has the beneficial effects that the unfrozen water content of the frozen soil at different negative temperatures can be obtained; a calculating result is accurate and reliable; the measurement error of the method is within 2.4 percent; the test accuracy of the unfrozen water of the frozen soil is ensured; convenience can be provided for temperature field calculation in frozen soil engineering construction.
Owner:TIANJIN CHENGJIAN UNIV
Method for generating spreading angle domain common image point gathers
ActiveCN102636809ACalculation stableCalculations are reliableSeismic signal processingGeneration processWave equation
The invention relates to a method for generating spreading angle domain common image point gathers. The method comprises the following steps that: 1) longitudinally partitioning a complex inhomogeneous medium to be prospected into different depth layers from the earth surface utilized as the beginning point; 2) arousing seismic waves in a successive blasting manner at the earth surface, spreading the seismic waves aroused each time downwards in a mode of spherical waves, when the seismic waves reach the different depth layers, respectively calculating an ordinary seismic offset wave field and a seismic offset wave field with spreading angle correction on each depth layer by using a wave equation; 3) generating angle information of the wave field at an imaging point on each depth layer; 4) obtaining ware field angle information on each imaging point in the depth layers to be prospected, selecting an angle adoption interval and an angle scope so as to perform data overlapping on an offset imaging result falling in one sampling interval until the offset data overlapping within all the angle scopes is completed, and transforming common-source imaging point gathers are into common angle domain imaging point gathers. The method can be used in the generation process of the angle domain common imaging point gathers in petroleum seismic prospecting widely.
Owner:INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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