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31results about How to "Meet engineering precision requirements" patented technology
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Net rack node location adjusting device and location adjusting method
ActiveCN104110140AMeet the needs of positioning adjustmentSimple structureBuilding material handlingEngineeringScrew thread
The invention belongs to the technical field of steel structures and in particular relates to a net rack node location adjusting device and location adjusting method. The net rack node location adjusting device comprises a bottom plate, a central round hole is formed in the bottom plate, a supporting tube is fixedly arranged on the bottom plate, an adjustable carrier tube is in threaded connection in the supporting tube, the adjustable carrier tube can move up and down relative to the supporting tube, a cross locating plate is arranged at the upper end face of the adjustable carrier tube, and the vertical downward projection of the center of the cross locating plate coincides with the central round hole of the bottom plate. When the net rack node location adjusting device is used for carrying out spherical node location, a coordinate converting method is utilized, and accurate location of spherical nodes can be achieved by measuring the coordinates of the central point of the cross locating plate. The net rack node location adjusting device and location adjusting method are convenient and effective for location and installation of the spherical nodes of net rack structures.
Owner:ZHEJIANG JINGGONG STEEL BUILDING GRP
Blast-furnace furnace-arch maintenance robot movement mechanism
InactiveCN101234490ASimple structureEasy to controlSpraying apparatusWelding/cutting auxillary devicesEngineeringRobot locomotion
The invention relates to a motion mechanism of a blast furnace top maintaining robot, comprising a support frame which is fixedly connected with the blast furnace top manhole and is positioned in the cavity of the blast furnace top. The support frame is provided with a rotary table, of which the rotary center is positioned in the center of the blast furnace top. The rotary table is provided with a lifting platform in which a telescopic boom is arranged. The structure well realizes a three degrees motion of the structure. With simple structure, good rigidity, the motion mechanism of the blast furnace top maintaining robot can automatically and precisely control the moving position and meet the operation requirement of the industry robot.
Owner:SHANGHAI UNIV
Automatic hydrate preventing device for deep water gas well test and preventing method
ActiveCN104088623AFull automatic monitoringReal-time automatic monitoringSurveyAutomatic controlControl signal
The invention belongs to the field of petroleum engineering, and particularly relates to an automatic hydrate preventing device for a deep water gas well test and a preventing method. The automatic hydrate preventing device for the deep water gas well test comprises an automatic data monitoring, acquisition and processing system and an automatic inhibitor control injection system, wherein the automatic data monitoring, acquisition and processing system lays the foundation for judgment of hydrate generation and correction by monitoring parameters of temperature, pressure, liquid flow, gas flow, liquid mineralization degree and gas component in real time; acquired data are processed, and a hydrate judgment result and an inhibitor adjusting result are given; and the automatic inhibitor control injection system rapidly sends a control signal according to the processing result of an upper computer, an executing mechanism is used for performing execution, the working parameters of an inhibitor injection pump are adjusted, and inhibitor injection is adjusted. According to the method and the device, the test condition can be automatically monitored in real time in the whole journey, the hydrate inhibitor injection speed is automatically controlled, and the automatic prevention purpose of hydrate is achieved.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Island micro power grid probabilistic load flow analytic calculation method
ActiveCN107846024ASimplify the classification processSimplify the programming processAc networks with different sources same frequencyComplex mathematical operationsMicrogridEngineering
The invention provides an island micro power grid probabilistic load flow analytic calculation method. The calculation method is provided for calculating an operation state of an island micro power grid including intermittent DG such as photovoltaic electricity, wind power and the like; loads of the island micro power grid fluctuates randomly. A conventional island micro power grid steady state load flow analysis method is mainly based on load flow calculation, a load flow result of only a single operation point can be obtained, research on probabilistic load flow calculation is only based ona simulation method which requires computational statistics on a large amount of samples so as to obtain a probabilistic load flow result, online analysis can be adversely affected due to long computation time, and correlation of DG contribution in the micro power grid is mostly not taken into consideration. To overcome the above limitations, the invention provides the island micro power grid probabilistic load flow analytic calculation method via which rapid island micro power grid probabilistic load flow calculation can be realized, requirements for engineering accuracy can be met, and the method disclosed in the invention can be used for on-line analytical application.
Owner:XIAMEN UNIV TAN KAH KEE COLLEGE
Photovoltaic cell output characteristic modeling method based on Bezier function
ActiveCN104462715AMeet engineering precision requirementsSpecial data processing applicationsPower flowCurrent point
The invention discloses a photovoltaic cell output characteristic modeling method based on a Bezier function. The method comprises the steps of S1, establishing a rectangular plane coordinate system, determining the positions of a short-circuit current point, a maximum power point and an open-circuit voltage point in the rectangular plane coordinate system, and determining the positions of two control points of the Bezier function in the rectangular plane coordinate system according to the positions of the short-circuit current point, the maximum power point and the open-circuit voltage point; S2, determining the coordinates of points, located on the left side and right side of the maximum power point, on the Bezier function curve according to the positions of the short-circuit current point, the maximum power point, the open-circuit voltage point and the two control points; S3, drawing a Bezier fitted curve. According to the method, photovoltaic cell output characteristic modeling can be achieved simply based on the parameters including short-circuit current, maximum power point and open-circuit voltage given by a manufacturer by means of the piecewise second-order Bezier function.
Owner:HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
Irrelevant multisource frequency domain load identification method based on COMI-PSO (comprehensive improved particle swarm optimization) algorithm
ActiveCN103559340AIncreased sensitivityGood precisionBiological modelsSpecial data processing applicationsLinear regressionOptimization problem
The invention discloses an irrelevant multisource frequency domain load identification method based on a COMI-PSO (comprehensive improved particle swarm optimization) algorithm. The method includes the steps: firstly, decoupling a dynamical equation of load identification according to irrelevance of a plurality of load sources; secondly, identifying loads by the aid of a transfer function based on a unary linear regression model and the least square solution; thirdly, searching a feasible load solution and minimizing the maximum relative error of measured response; finally, performing search by the aid of the COMI-PSO algorithm to solve a simple target optimization problem, and identifying a plurality of irrelevant load sources. According to response signals of a plurality of measuring points, a plurality of irrelevant frequency domain load sources can be simultaneously identified, the problem of difficulty in obtaining the transfer function can be thoroughly solved, occurring ill-posed problems are solved by matrix inversion at resonant frequency, precision of multi-element load excitation identified by the method and sensitivity to measuring noise are superior to those of a traditional method, and 3db engineering precision requirements can be basically met.
Owner:HUAQIAO UNIVERSITY
Algorithm for maximum jump height of deicing of single-span iced power transmission line
ActiveCN109858117AEmbody the physical laws of ice jumpingSimplified Jump Height Calculation FormulaSpecial data processing applicationsRelational modelDynamic Tension
The invention discloses an algorithm for the maximum jump height of deicing of a single-span iced power transmission line. According to the patent application, a single-span power transmission line deicing theory analysis simplified model is established, the deicing load of the power transmission line is regarded as a sudden dynamic load, and based on the cable structure theory and the energy method, the maximum jump height calculation simplified method of the single-span ice-coated power transmission line is provided for design and ice-resistant reinforcement reference. The method comprises the following steps: S1, analyzing the deicing state of an iced power transmission line; s2, establishing a dynamic tension and maximum jump height relation model; and S3, solving based on an energy principle.
Owner:CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
Construction and retrieval method of aircraft vibration fault database based on perceptual hash algorithm
ActiveCN109271936ARapid positioningMeet engineering precision requirementsCharacter and pattern recognitionStill image data queryingWavelet transformTime frequency domain
A construction and retrieval method of aircraft vibration fault database based on perceptual hash algorithm includes that a test data, a filtering, a resampling, a wavelet transform are read, and time-frequency domain data matrix is transformed into gray-scale image, the gray-scale image is mapped to a new fixed-size gray-scale image by hashing algorithm, the mapped gray-scale image is mapped twice and converted into binary image, the elements in the binary image matrix are rearranged to generate a hash value; the generated hash value is compared to the hash value in the database one by one, coherence coefficient is calculated: and then the fault analysis and prejudgment are carried out. The invention summarizes the vibration fault data and experience of civil aircraft, constructs the vibration fault database of civil aircraft, directly processes the collected complete vibration data in time domain, and compares the data with the data in the database, so that the fault type can be quickly located, the engineering use precision can be satisfied, the engineering is safe and reliable, and is suitable for popularization and popularization.
Owner:HARBIN ENG UNIV
Method for determining I-V characteristic fitting curve of crystalline silicon photovoltaic cell
ActiveCN112084657AMeet engineering precision requirementsSimplified descriptionDesign optimisation/simulationComplex mathematical operationsFill factorCrystalline silicon
The invention discloses a method for determining an IV characteristic fitting curve of a crystalline silicon photovoltaic cell. With the crystalline silicon photovoltaic cell as an object, the invention provides data in a data manual of the photovoltaic cell without solving a transcendental equation and any measured data. Disclosed is a method for simply fitting a left side and a right side of themaximum power point of the IV characteristic curve of the crystalline silicon photovoltaic cell by the two second-order Bezier functions, the IV characteristic fitting curve of the crystalline silicon photovoltaic cell meeting the engineering precision requirement is given by finding out the linear law between the control point position of a Bezier function curve and a filling factor of the crystalline silicon photovoltaic cell.
Owner:HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
Blast-furnace furnace-arch maintenance robot movement mechanism
InactiveCN100586668CSimple structureEasy to controlSpraying apparatusWelding/cutting auxillary devicesEngineeringRobot locomotion
Owner:SHANGHAI UNIV
Real-time calculation method for climbing performance data of transportation aircraft
PendingCN114491793AReduce workloadReduce duplication of effortGeometric CADSpecial data processing applicationsAirplaneEngine power
The invention provides a transportation aircraft climbing performance data real-time calculation method, which comprises the following steps: acquiring input data including aircraft basic layout parameters, aircraft longitudinal aerodynamic characteristic data and engine power data; determining a climbing speed range and corresponding aerodynamic characteristic data of the transportation aircraft according to the input data, fitting aircraft longitudinal aerodynamic characteristic data required by climbing performance into a linear function or polynomial form, fitting engine power data into a polynomial form, and forming a fairing curve; and carrying out approximation on the lift curve model and the climbing rate model of the airplane in the climbing state, and calculating to obtain the climbing rate, the fast lifting speed, the corresponding climbing rate and the corresponding lift limit. According to the method, the relevant parameters of the climbing performance can be calculated in real time, a climbing performance database with huge data does not need to be established, the workload of aircraft designers is relieved, and the working efficiency is improved.
Owner:XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
Method for recognizing tension of arch bridge boom by considering a plurality of factors of environment
InactiveCN109540350AObjectively reflect the impact of tensionHigh formula precisionForce measurement by measuring frquency variationsSimulationArch bridge
The present invention discloses a method for recognizing the tension of an arch bridge boom by considering a plurality of factors of an environment. The method comprises the steps of: establishing anarc bridge boom tension calculation model, deducing an analysis expression of the tension and a lateral vibration frequency of a boom in a complex boundary condition, for facilitating engineering application, giving a boom tension practical expression through adoption of a boundary influence coefficient method, performing example verification, analyzing the calculation precision, application features and differences of each expression to provide reference for determination of the boom tension. Through consideration of the conditions such as flexural rigidity and the length of the boom, a vibration reduction pad, additional mass, elastic support, a sticky sheath and an environment temperature, the analysis expression of the tension and the vibration frequency of the boom is high in calculation precision and is suitable for tension vibration test calculation of booms with various lengths in a construction period and an operation period, the boom tension practical expression is high in calculation precision based on the boundary influence coefficient to meet the engineering precision demand, the mode is an explicit expression form, and the practicability is high.
Owner:NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
Rapid determining method of structural response driven by broadband and unsteady-state signal
InactiveCN103218539AMeet engineering precision requirementsGuaranteed stabilitySpecial data processing applicationsDecompositionIntermediate frequency
The invention discloses a rapid determining method of structural response driven by broadband and an unsteady-state signal and is based on wavelet decomposition. The method is based on structural response calculation of drive signal decomposition angles, the facts that engineering precision of calculated results is satisfied and the stability of the computational results is ensured are well achieved, and computational efficiency is significantly improve. The method comprises the following steps of (1) selecting a wavelet basis function, conducting the wavelet decomposition on a drive signal, and obtaining narrow-band and steady signals of different frequency bands; (2) adopting a mode superposition method to calculate low-frequency excitation response, adopting a Newmark method to calculate intermediate frequency excitation response and adopting an immediate integration method to calculate high-frequency excitation response; (3) adopting a linear interpolation method to conduct interpolation, and conducting dynamic response interpolation on a low-frequency drive signal, an intermediate frequency drive signal and a high-frequency drive signal in step (2); and (4) conducting linear superposition of dynamic response interpolation on the low-frequency drive signal, the intermediate frequency drive signal and the high-frequency drive signal, and obtaining dynamic response, driven by original broadband and unsteady-state load signals, of a linear system.
Owner:CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
Automatic hydrate preventing device for deep water gas well test and preventing method
ActiveCN104088623BFull automatic monitoringReal-time automatic monitoringSurveyAutomatic controlControl signal
The invention belongs to the field of petroleum engineering, and particularly relates to an automatic hydrate preventing device for a deep water gas well test and a preventing method. The automatic hydrate preventing device for the deep water gas well test comprises an automatic data monitoring, acquisition and processing system and an automatic inhibitor control injection system, wherein the automatic data monitoring, acquisition and processing system lays the foundation for judgment of hydrate generation and correction by monitoring parameters of temperature, pressure, liquid flow, gas flow, liquid mineralization degree and gas component in real time; acquired data are processed, and a hydrate judgment result and an inhibitor adjusting result are given; and the automatic inhibitor control injection system rapidly sends a control signal according to the processing result of an upper computer, an executing mechanism is used for performing execution, the working parameters of an inhibitor injection pump are adjusted, and inhibitor injection is adjusted. According to the method and the device, the test condition can be automatically monitored in real time in the whole journey, the hydrate inhibitor injection speed is automatically controlled, and the automatic prevention purpose of hydrate is achieved.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Intelligent well killing method and device for complex pressure system stratum
ActiveCN113006769AFull automatic monitoringReal-time automatic monitoringSurveyConstructionsTime informationWell kill
The invention relates to an intelligent well killing method and device for a complex pressure system stratum. The method comprises the steps that (1) real-time information of the underground-ground is monitored in real time; (2) the real-time information of the underground-ground is processed, the underground working condition is judged, and if underground abnormity occurs, on one hand, uncertain parameters in a shaft multi-phase flow model are inverted in real time, and on the other hand, shaft pressure distribution is dynamically simulated and calculated; and (3) a control signal is sent out, throttling control parameters are intelligently optimized and designed, the throttling control parameters comprise the connecting mode of a throttling valve and a pressure drop distribution scheme, the wellhead pressure is adjusted in real time to maintain the constant bottom hole pressure, meanwhile, casing pressure vertical pressure feedback is tracked, and a well killing regulation and control scheme is intelligently optimized and adjusted through a feedback knot. According to the method, the underground working condition can be automatically monitored in real time in the whole process, the stratum pressure information is intelligently inverted according to the change trend of the measurement information, and the purposes of accurate and timely monitoring of the underground abnormity and intelligent recognition of the complex pressure system stratum information are achieved.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Aero-engine starting simulation model correction method based on test data
ActiveCN113886983AImprove start-up simulation accuracyMeet engineering precision requirementsGeometric CADDesign optimisation/simulationAero engineSimulation
The invention belongs to the field of aero-engine design, and particularly relates to an aero-engine starting simulation model correction method based on test data, and the method comprises the steps: calculating a correction value under a preset condition, and carrying out the simulation calculation of the calculated correction value to obtain a simulation correction value under a target condition, and calculating the rotating speed under the target condition through the obtained correction value. By adopting the method, the starting simulation precision can be greatly improved, the maximum error of high-voltage and low-voltage rotating speed simulation and actual comparison is within 6.9%, and the engineering precision requirement is met.
Owner:AECC SHENYANG ENGINE RES INST
Inversion feedback type regeneration device simulation method suitable for power flow simulation calculation
PendingCN113852079AMeet engineering precision requirementsGuaranteed simulation speedSingle network parallel feeding arrangementsAc networks with different sources same frequencyPower flowVoltage source
The invention provides an inversion feedback type regeneration device simulation method suitable for power flow simulation calculation, and the method comprises the following steps that a main circuit model which is formed by connecting two branches in parallel is established, wherein the first branch is formed by connecting a switch element K1, a resistor element R and a controlled voltage source Uiv in series, and the second branch is formed by connecting a switch element K2 and a controlled current source Iiv in series; a control system calculation unit is established, and calculation of each simulation step length is carried out according to constant parameters set before simulation and the direct current network side voltage udc and the direct current network side input current idc, collected in simulation, of the main circuit model. Complex electrical external characteristics of the inversion feedback type regeneration device are simulated by establishing the universal main circuit model and the control system calculation unit, a converter circuit containing a large number of power electronic devices does not need to be established, the engineering precision requirement is met, and the simulation speed is guaranteed.
Owner:CHINA RAILWAY ELECTRIFICATION SURVEY DESIGN & RES INST
Construction and Retrieval Method of Aircraft Vibration Fault Database Based on Perceptual Hash Algorithm
ActiveCN109271936BRapid positioningMeet engineering precision requirementsCharacter and pattern recognitionStill image data queryingAlgorithmEngineering
The aircraft vibration fault database construction and retrieval method based on the perceptual hash algorithm, including reading test data, filtering, resampling, wavelet transform, transforming the time-frequency domain data matrix into a grayscale image; through the hash algorithm, the grayscale image Map to a new fixed-size grayscale image; perform secondary mapping on the mapped grayscale image and convert it into a binary image; rearrange the elements in the binary image matrix to generate a hash value; convert the generated hash Values are compared with the hash values in the database one by one, and the coherence coefficient is calculated: then the fault analysis and pre-judgment are carried out. The invention summarizes the civil aircraft vibration fault data and experience, builds a civil aircraft vibration fault database, and directly analyzes the collected complete The time-domain vibration data is processed and compared with the data in the database, which can quickly locate the fault type, meet the accuracy of engineering use, and the engineering is safe and reliable, suitable for popularization and promotion.
Owner:HARBIN ENG UNIV
A kind of intelligent killing method and device of complex pressure system formation
ActiveCN113006769BFull automatic monitoringReal-time automatic monitoringSurveyConstructionsTime informationWell kill
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Simulation method for energy storage type regenerative energy absorbing device suitable for power flow simulation calculation
ActiveCN113346534BMeet engineering precision requirementsGuaranteed simulation speedEnergy storageAc network load balancingControl signalHemt circuits
The invention provides a method for simulating an energy storage type regenerative energy absorbing device suitable for power flow simulation calculation, comprising the following steps: establishing a main circuit model, which is formed by connecting two branches in parallel, one of which is composed of a switching element K 1 , resistance element R , controlled voltage source U sc Formed in series, branch two consists of switching elements K 2 , controlled current source I sc Formed in series; establish the calculation unit of the control system, which is based on the constant parameters set before the simulation and the DC grid side voltage of the main circuit model collected in the simulation u dc , DC grid side input current i dc , and the control signal output by the calculation unit of the control system at the last simulation step soc , for each simulation step calculation. The invention simulates the complex electrical external characteristics of the energy storage type regenerative energy absorbing device by establishing a general-purpose main circuit model and a control system calculation unit, without building a converter circuit containing a large number of power electronic devices, which not only meets the engineering accuracy requirements, The simulation speed is also guaranteed.
Owner:CHINA RAILWAY ELECTRIFICATION SURVEY DESIGN & RES INST
Open channel flow measurement method, system and device and storage medium
ActiveCN114088144ARealize cumulative calculationReduce the workload of actual measurementVolume/mass flow measurementStream flowEngineering
The invention provides an open channel flow measurement method, system and device and a storage medium, and the method comprises the steps: building a CFD model of a to-be-detected open channel section during normal water supply, and carrying out the fitting of the CFD model to obtain a flow velocity field of the open channel section; extracting flow velocity data on a plurality of measuring vertical lines in the open channel section flow velocity field based on the flow velocity field; according to the flow velocity data on the plurality of vertical lines, obtaining flow velocity distribution on the plurality of vertical lines and a transverse flow velocity distribution rule of the plurality of vertical lines, and further obtaining a flow velocity distribution rule of the open channel section; and actually measuring the flow velocity value of a reference point of the open channel section and calculating the total flow of the open channel section in combination with the flow velocity distribution rule; fitting an open channel section flow velocity field by establishing a CFD model, fitting a section flow velocity distribution rule curve through the flow velocity field, and achieving accumulated calculation of open channel section flow through flow velocity values of fewer actual measurement points. The actual measurement workload can be remarkably reduced, the flow measurement and calculation result is stable and reliable, and the engineering precision requirement is met.
Owner:SICHUAN UNIV +1
Analytical calculation method of probabilistic power flow for isolated island microgrid
ActiveCN107846024BSimplify the classification processSimplify the programming processAc networks with different sources same frequencyComplex mathematical operationsIslandingProbabilistic load flow
The invention provides an island micro power grid probabilistic load flow analytic calculation method. The calculation method is provided for calculating an operation state of an island micro power grid including intermittent DG such as photovoltaic electricity, wind power and the like; loads of the island micro power grid fluctuates randomly. A conventional island micro power grid steady state load flow analysis method is mainly based on load flow calculation, a load flow result of only a single operation point can be obtained, research on probabilistic load flow calculation is only based ona simulation method which requires computational statistics on a large amount of samples so as to obtain a probabilistic load flow result, online analysis can be adversely affected due to long computation time, and correlation of DG contribution in the micro power grid is mostly not taken into consideration. To overcome the above limitations, the invention provides the island micro power grid probabilistic load flow analytic calculation method via which rapid island micro power grid probabilistic load flow calculation can be realized, requirements for engineering accuracy can be met, and the method disclosed in the invention can be used for on-line analytical application.
Owner:XIAMEN UNIV TAN KAH KEE COLLEGE
Method for calculating bearing capacity of confined concrete combination column under action of bias pressure
ActiveCN114297902AImprove integrityAvoid premature separationGeometric CADSustainable transportationArchitectural engineeringPipe
The invention relates to a method for calculating the bearing capacity of a confined concrete combination column under the action of bias pressure, the combination column comprises a polygonal steel pipe and a corrugated plate, and concrete is poured in the polygonal steel pipe to form second cavity concrete; every two adjacent polygonal steel pipes are connected through a corrugated plate, the polygonal steel pipes and the corrugated plates are welded to form a special-shaped multi-cavity body, and concrete is poured into the special-shaped multi-cavity body to form first cavity concrete. The bearing capacity of the confined concrete combination column under the action of bias pressure is jointly determined according to the first cavity concrete bearing capacity, the second cavity concrete bearing capacity and the polygonal steel pipe bearing capacity in the special-shaped multi-cavity. According to the method, the bias bearing capacity of the combination column can be calculated only by restraining information such as the strength and the geometric dimension of the material of the concrete combination column, the problem of overload of the combination column is solved, and meanwhile the engineering precision requirement can be met.
Owner:JIANGNAN UNIV
The method of calculating the distance between the rear of the car and the parked car in the operation of shunting the top of the car
ActiveCN114524003BSolve the problem of increasing calculation errorIncreased calculation errorRailway signalling and safetyHigh level techniquesLaser rangingTransfer operation
Owner:BEIJING BEIJIAO XINTONG TECH
A network frame node positioning adjustment device and positioning adjustment method
ActiveCN104110140BMeet the needs of positioning adjustmentSimple structureBuilding material handlingEngineeringMechanical engineering
The invention belongs to the technical field of steel structures and in particular relates to a net rack node location adjusting device and location adjusting method. The net rack node location adjusting device comprises a bottom plate, a central round hole is formed in the bottom plate, a supporting tube is fixedly arranged on the bottom plate, an adjustable carrier tube is in threaded connection in the supporting tube, the adjustable carrier tube can move up and down relative to the supporting tube, a cross locating plate is arranged at the upper end face of the adjustable carrier tube, and the vertical downward projection of the center of the cross locating plate coincides with the central round hole of the bottom plate. When the net rack node location adjusting device is used for carrying out spherical node location, a coordinate converting method is utilized, and accurate location of spherical nodes can be achieved by measuring the coordinates of the central point of the cross locating plate. The net rack node location adjusting device and location adjusting method are convenient and effective for location and installation of the spherical nodes of net rack structures.
Owner:ZHEJIANG JINGGONG STEEL BUILDING GRP
AC-DC bidirectional converter simulation method suitable for power flow simulation calculation
PendingCN113850039AMeet engineering precision requirementsGuaranteed simulation speedData processing applicationsCAD circuit designDc currentHemt circuits
The invention provides an AC-DC bidirectional converter simulation method suitable for power flow simulation calculation, and the method comprises the following steps: establishing a main circuit model which is composed of a DC loop and an AC loop which are not connected; wherein the direct-current loop has two branches: the first branch is formed by connecting a switch element K1, a resistor element R and a controlled direct-current voltage source Ucon in series, and the second branch is formed by connecting a switch element K2 and a controlled direct-current current source Icon in series, and the alternating current loop has three branches: a controlled alternating current source Ia, a controlled alternating current source Ib and a controlled alternating current source Ic; establishing a control system calculation unit, and calculating each simulation step length. The complex electrical external characteristics of the AC-DC bidirectional converter are simulated by establishing the main circuit model and the control system calculation unit, a converter circuit containing a large number of power electronic devices does not need to be established, the engineering precision requirement is met, and the simulation speed is guaranteed.
Owner:CHINA RAILWAY ELECTRIFICATION SURVEY DESIGN & RES INST
An uncorrelated multi-source frequency domain load identification method based on comi‑pso algorithm
ActiveCN103559340BIncreased sensitivityGood precisionBiological modelsSpecial data processing applicationsLinear regressionLeast squares
The invention discloses an irrelevant multisource frequency domain load identification method based on a COMI-PSO (comprehensive improved particle swarm optimization) algorithm. The method includes the steps: firstly, decoupling a dynamical equation of load identification according to irrelevance of a plurality of load sources; secondly, identifying loads by the aid of a transfer function based on a unary linear regression model and the least square solution; thirdly, searching a feasible load solution and minimizing the maximum relative error of measured response; finally, performing search by the aid of the COMI-PSO algorithm to solve a simple target optimization problem, and identifying a plurality of irrelevant load sources. According to response signals of a plurality of measuring points, a plurality of irrelevant frequency domain load sources can be simultaneously identified, the problem of difficulty in obtaining the transfer function can be thoroughly solved, occurring ill-posed problems are solved by matrix inversion at resonant frequency, precision of multi-element load excitation identified by the method and sensitivity to measuring noise are superior to those of a traditional method, and 3db engineering precision requirements can be basically met.
Owner:HUAQIAO UNIVERSITY
A graph-based detection method for flow pulsation characteristics of multi-pump confluence
ActiveCN109900422BMeet engineering precision requirementsEasy to calculateRapid change measurementComplex mathematical operationsStream flowEngineering
The invention relates to a graph-based detection method of a multi-pump confluence flow pulsation characteristic. The graph-based detection method comprises the steps that 1, according to a type of apump, an instantaneous flow function and an average flow when each pump works independently are obtained by using a pump flow theoretical model or a flow pulsation experimental result; 2, a pump angleis arbitrarily chosen as a foundation rotation angle, and the rotation angle phase difference random characteristic and the foundation rotation angle range between other pumps and the pump are determined; 3, the instantaneous flow function and the average flow are calculated when the multiple pumps work together; 4, a multivariate function relationship between the confluence flow pulsation rate and each rotation angle phase difference is determined by calculating and is represented graphically; and 5, a graph in the step 4 is used for calculating probability corresponding to the confluence flow pulsation rate in the pulsation rate range. Compared with the prior art, the graph-based detection method is convenient in calculation and can meet requirements of engineering accuracy, and can provide theoretical basis for designing the multi-pump system, suppressing system flow pulsation, and reducing noise and vibration.
Owner:TONGJI UNIV
Modeling method of mathematical model for silicon solar cell engineering
InactiveCN101833602BQuick responseShorten operation timeSystems intergating technologiesSpecial data processing applicationsMicrocontrollerMathematical model
The invention relates to a modeling method of a mathematical model for silicon solar cell engineering, which is used for modeling according to the characteristic of large similarity of an I-V characteristic curve of a silicon solar cell and a particle-throwing motion locus curve. In the coordinate system of the particle-throwing motion locus curve, the coordinate system is divided into different gravitational fields by two demarcation points at a maximum-power point voltage position and a voltage position lower than the maximum power point, and then deducing and modeling are carried out according to the principle of kinematics. The invention not only can still meet the requirement of engineering precision well; through adjusting the position of the demarcation point in the voltage position lower than the maximum power point, the model of the invention can be close to actual measurement data in a zone nearby the maximum-power point voltage position well so as to be beneficial to the realization of a maximum power tracking algorithm; and the invention can also greatly improve the response speed of control units in controllers along with the changes of external environments comprising illumination, temperature and the like. When the model is calculated and controlled by adopting controllers comprising a single-chip machine or a DSP (Digital Signal Processor) and the like in engineering practice, the operating time of the model is greatly shortened.
Owner:CHONGQING UNIV
A Modeling Method of Photovoltaic Cell Output Characteristics Based on Bezier Function
ActiveCN104462715BMeet engineering precision requirementsSpecial data processing applicationsSimulationCurrent point
The invention discloses a photovoltaic cell output characteristic modeling method based on a Bezier function. The method comprises the steps of S1, establishing a rectangular plane coordinate system, determining the positions of a short-circuit current point, a maximum power point and an open-circuit voltage point in the rectangular plane coordinate system, and determining the positions of two control points of the Bezier function in the rectangular plane coordinate system according to the positions of the short-circuit current point, the maximum power point and the open-circuit voltage point; S2, determining the coordinates of points, located on the left side and right side of the maximum power point, on the Bezier function curve according to the positions of the short-circuit current point, the maximum power point, the open-circuit voltage point and the two control points; S3, drawing a Bezier fitted curve. According to the method, photovoltaic cell output characteristic modeling can be achieved simply based on the parameters including short-circuit current, maximum power point and open-circuit voltage given by a manufacturer by means of the piecewise second-order Bezier function.
Owner:HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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