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31results about How to "Reduce simulation error" patented technology
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Suspension type monorail vehicle coupling dynamic simulation system and method
ActiveCN108256278ASolve decouplingReduce simulation errorSustainable transportationDesign optimisation/simulationVehicle dynamicsDynamic models
The invention discloses a suspension type monorail vehicle dynamic model and a vehicle-bridge coupling power simulation method, belongs to the technical field of rail traffic and aims to solve the technical problem that an existing suspension type monorail dynamics simulation device is large in simulation result errors during rail beam local vibration research. By providing the suspension type monorail vehicle system dynamic model, a rubber wheel-rail surface contact mechanical model, a rail beam bottom plate and web equivalent surface force application method and a vehicle and rail beam coupling dynamic model building method, a suspension type monorail vehicle-rail beam coupling dynamic simulation system is built. By the model, the system and the method, suspension type monorail vehicle system suspension mechanism decoupling and equivalent treatment are achieved, and the technical problems that the existing suspension type monorail dynamics simulation device is large in simulation result errors during the rail beam local vibration research, rail beam dynamic stress and strain results are hard to extract, rail beam local strength destroying cannot be evaluated accurately and the like are solved.
Owner:SOUTHWEST JIAOTONG UNIV
Excitation inrush current simulation method and device for ultra-high voltage transformer under condition of no-load closing
ActiveCN104200055ACorrected anhysteretic magnetizationEnable accurate simulationSpecial data processing applicationsHysteresisMagnetic susceptibility
The invention provides an excitation inrush current simulation method and device for an ultra-high voltage transformer under a condition of no-load closing. The excitation inrush current simulation method comprises the following steps: on the basis of the transitional area between the linear area and the non-linear area of the non-hysteresis curve, non-hysteresis magnetization intensity indicated by Langvin function is corrected; the corrected non-hysteresis magnetization intensity is utilized to establish a J-A magnetic hysteresis model; the parameters of the J-A magnetic hysteresis model are recognized; an analysis is conducted on the ultra-high voltage transformer and the differential magnetic susceptibility equation is determined; through the J-A magnetic hysteresis model and the differential magnetic susceptibility equation, the excitation inrush current of the ultra-high voltage transformer under the empty charging condition is determined. The excitation inrush current simulation method and device for the ultra-high voltage transformer under the condition of non-load losing correct the non-hysteresis magnetization intensity, enable the transitional area between the linear area and saturation area of the non-hysteresis curve to be closer to a true value and accurately simulate the magnetization characteristics of the transformer; moreover, the special construction of the ultra-high voltage transformer is considered and the excitation inrush current of the ultra-high voltage transformer under the condition of empty charging is simulated. Errors in the simulation are reduced.
Owner:STATE GRID CORP OF CHINA +3
Reliability assessment method of distribution network considering load characteristics and distributed power supply access
ActiveCN109103874AIn line with actual operating conditionsReliability Index Prediction ImprovementLoad forecast in ac networkSingle network parallel feeding arrangementsIslandingPower grid
The invention provides a reliability evaluation method of a distribution network considering load characteristics and distributed power supply access. The method fully considers the sequential load characteristics of different user types and different seasons, so that the evaluation result is more in line with the actual operation status of the power network. At the same time, the islanding supporting effect of DGAs on distribution network is also considered, which makes the evaluation method more applicable and can cope with more diverse distribution scenarios. Existing reliability assessmentof distribution network usually does not take into account the load sequence changes, the peak load is used for simulation, and the influence of the fault is inevitably amplified. The load characteristics such as load sequence characteristics and user type are considered in the reliability evaluation of the invention, so that the load point and the reliability index prediction result of the system can be improved, and the reliability index prediction result of the system is closer to the actual value.
Owner:FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
Real-time control system and method for depth simulator
ActiveCN101984378AReduce simulation errorHigh static precisionSimulator controlReal-time Control SystemHydraulic pump
The invention discloses a real-time control system and real-time control method for a depth simulator. A hydraulic pump station provides an oil source so that a pressure cavity generates corresponding pressure; one path of the pressure is applied onto a user sensor, and the other path is applied onto a double-range pressure sensor; a feedback voltage signal of the double-range pressure sensor acquired by PCI-1716 is transmitted to an industrial control computer and is converted into a pressure intensity signal serving as a system feedback value; the industrial control computer receives a digital depth signal transmitted by an emulation host into a pressure intensity signal serving as a reference input value of a depth simulator system, calculates an error amount and performs PID operation and converts the calculated value amount representing the depth into a voltage signal; and the open size and in / out oil of an electro-hydraulic servo valve are controlled by a PCI-1723 data output card so that a working cavity generates corresponding pressure. The invention ensures low delay and high real-time performance, reduces the emulation error and improves the control precision.
Owner:JIANGSU ZHONGKUANG HEAVY EQUIP CO LTD +1
Equivalent method for electromagnetic and electromechanical transient hybrid simulation electromagnetic side system
InactiveCN104615479AImproved Accuracy of Electromechanical Transient SimulationReduce simulation errorSoftware simulation/interpretation/emulationVoltage amplitudeTransient state
The invention discloses an equivalent method for an electromagnetic and electromechanical transient hybrid simulation electromagnetic side system, and belongs to the technical field of electric system simulation. The method is suitable for a commercial electromagnetic transient simulation platform, and includes the steps that voltage fundamental wave positive sequence phasors and current fundamental wave positive sequence phasors at all interface buses are extracted; active power P and reactive power Q which are injected from an electromechanical side to an electromagnetic side of the interfaces are calculated; P, Q, the positive sequence voltage amplitude values U of the interfaces and the phase angle difference between voltages of the interfaces serve as equivalent information of the interface k and are transmitted to the electromechanical transient simulation platform; a corresponding iteration coefficient matrix is constructed, and used for obtaining voltages of electromechanical transient simulation nodes in an iteration mode. According to the method, simulation errors, for electromechanical transient simulation, caused by an electromagnetic side equivalent model can be effectively reduced, and particularly, the equivalent method has an effect of obviously improving the electromechanical transient simulation precision of an electromechanical side system during a failure.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
One-dimensional and three-dimensional joint simulation method for automobile engine cooling system
ActiveCN112380613AReduce simulation errorAddresses an issue that prevented accurate assessment of cooling system water temperatureGeometric CADInternal combustion piston enginesDimensional simulationAir volume
The invention discloses a one-dimensional and three-dimensional joint simulation method for an automobile engine cooling system. The method comprises the steps of using three-dimensional simulation software for estimating the thermal power of a radiator, an intercooler and a condenser, taking constant values as the thermal power of the condenser, and then obtaining the outlet air volume of a radiator core, the outlet air volume of the intercooler core and the surface temperature average value of a core inlet; performing one-dimensional system simulation calculation by utilizing one-dimensionalsimulation software based on the air volume and the temperature average value to obtain the thermal power of the radiator and the intercooler; obtaining outlet air volumes of a radiator core, an intercooler core and a condenser core and a surface temperature average value of a core inlet by using three-dimensional simulation software according to the thermal power of the radiator, the intercoolerand the condenser; and repeatedly executing the steps to perform iterative computation until convergence conditions are met. The advantages of the one-dimensional simulation software and the advantages of the three-dimensional simulation software are fully utilized, simulation errors caused by heat reflux are reduced through repeated iteration, and the simulation precision of the water temperature of the cooling system is improved.
Owner:SAIC-GM-WULING AUTOMOBILE CO LTD
Free-form optical reflector for LED (light-emitting diode) motorcycle low beam
ActiveCN102777858AReduce volumeHigh precisionPoint-like light sourceRoad vehiclesOptical reflectionLight energy
The invention discloses a free-form optical reflector for an LED (light-emitting diode) motorcycle low beam, wherein an internal surface of the reflector is a free-form surface to form an optical reflecting surface; the bottom surface of the reflector is provided with an opening for installation of an LED; one end rightly facing the bottom surface is a light exit port of the reflector; the majority of light emitted by the LED light source is reflected by the internal surface of the reflector and then is emergent to an illuminating plane, and the other light is directly emergent to the illuminating plane. The reflector is divided into an upper part and a lower part; the free-form surface at the upper part of the internal surface of the reflector is mainly used for reflecting the light above a horizontal plane to the illuminating plane below the horizontal plane; the free-form surface at the lower part of the internal surface of the reflector is mainly used for gathering diffused light below the horizontal plane to the illuminating plane below the horizontal plane. The free-form optical reflector for the LED motorcycle low beam has the characteristics of simple structure, convenience in installation and high utilization rate of light energy; light direction can be effectively controlled and the glare effect can be inhibited; and the free-form optical reflector for the LED motorcycle low beam meets the light distribution requirements in GB5948-1998.
Owner:SOUTH CHINA UNIV OF TECH
Method for inverting simulation parameters through machine learning neural network
PendingCN111723513AMinimize the differenceReduce simulation errorGeometric CADDesign optimisation/simulationPhysical modelInjection molding process
The invention discloses a method for inverting simulation parameters through a machine learning neural network. The method comprises the following steps: establishing the machine learning neural network; and taking injection molding simulation software based on the physical model as a learning object, and adjusting the weight of the neural network by using an inversion algorithm in a machine learning algorithm to enable the neural network to use the same input parameter to calculate a corresponding result calculated by the injection molding simulation software based on the physical model. Andthen, according to the difference between the measured value in the injection molding system quantified by the sensor and the predicted value of the neural network model learned by the training, the input parameters which should be used in the injection molding simulation software are inverted, the most important parameters being, but not limited to, rheological model coefficients. And the input parameters subjected to machine learning inversion adjustment are introduced to the injection molding simulation software, so that the difference between a simulation prediction value and an actual measurement value can be reduced, and digital twinning of a simulation injection molding process is realized so as to facilitate intelligent control.
Owner:深圳同奈信息科技有限公司 +1
Remote sensing imaging simulation method and device
ActiveCN109300120AReduce cost inputLow implementation costImage enhancementImage analysisComputer scienceImage mode
The embodiment of the invention provides a remote sensing imaging simulation method and a device, which relate to the technical field of computer simulation and are used for simulating the imaging result of a satellite optical sensor. The method includes: acquiring a first image; Determining a downsampling region in the first image according to downsampling parameters and imaging mode parameters of the optical sensor; Performing down-sampling processing on pixels in the down-sampling area to obtain a second image; The second image is adjusted according to the imaging mode parameters to obtaina remote sensing imaging simulation image based on the imaging mode parameters. The method can simplify the simulation process of satellite remote sensing imaging and reduce the cost and difficulty ofsatellite remote sensing imaging simulation.
Owner:CAPITAL NORMAL UNIVERSITY +1
Method and device for establishing photovoltaic cell simulation model considering local shading
InactiveCN108664737AImprove the simulation effectReduced service lifeDesign optimisation/simulationSpecial data processing applicationsReverse currentEngineering
The invention discloses a method and device for establishing a photovoltaic cell simulation model considering local shading. The method comprises the steps of obtaining standard parameters of a photovoltaic cell; determining equivalent series resistance, equivalent parallel resistance, P-N junction effect current and P-N junction effect reverse saturation current of the photovoltaic cell simulation model according to the standard parameters of the photovoltaic cell; according to the standard parameters, the equivalent series resistance, the equivalent parallel resistance, photo-generated current, the P-N junction effect current, the P-N junction effect reverse saturation current and an avalanche breakdown voltage, determining output load current of the photovoltaic cell simulation model; based on the equivalent series resistance, the equivalent parallel resistance, equivalent diode P-N junction direction saturation current and the output load current, establishing the photovoltaic cellsimulation model considering the local shading; the equivalent parallel resistance is connected in parallel with a reverse current source, and a bypass diode is connected in parallel between the positive and negative electrodes of a photovoltaic cell assembly. The device is used for implementing the method.
Owner:SHENZHEN POWER SUPPLY BUREAU
Method for establishing equivalent model based on CAE battery module connection structure
InactiveCN111523193AImprove Simulation EfficiencyReduce simulation errorDesign optimisation/simulationClassical mechanicsStructural engineering
The invention discloses a method for establishing an equivalent model based on a CAE battery module connection structure. The method comprises the following steps of: 1), establishing an accurate model of the battery module connection structure, and carrying out simulation tests of axial compression and radial overturning offset on the accurate model; 2) establishing an equivalent model, and performing the same simulation tests of axial compression and radial overturn offset on the equivalent model; and 3) comparing reaction force difference values of parallel elastic sheets in simulation tests of the two models, and adjusting anisotropic material parameters applied to series elastic sheet equivalent bodies in the equivalent model according to the difference values until the reaction forcedifference values of the parallel elastic sheets in the simulation tests of the two models are reduced to an ideal range. By adopting the method for establishing the equivalent model, simulation errors can be reduced in the later finite element simulation process, and the simulation efficiency of the battery connection structure and the whole pack of the battery connection structure can be greatly improved.
Owner:SUZHOU ANKAO ENERGY
Power battery pack fatigue life calculation method
PendingCN112329313AEvaluate performanceImprove performanceDesign optimisation/simulationSpecial data processing applicationsPower batteryRoad surface
The invention discloses a power battery pack fatigue life calculation method, which comprises two working conditions of multi-axis vibration fatigue analysis and torsional fatigue, load inputs of thetwo working conditions are from test actual measurement data, and meanwhile, influences of welding spots and welding seams of a key area of a power battery pack on fatigue life are considered. According to the method for calculating the fatigue life of the power battery pack provided by the invention, the stress condition of the power battery pack with a flexible connection structure is also considered in vibration fatigue analysis, and the stress load of the power battery pack on various road surfaces is accurately and comprehensively considered; according to the method, the performance of the power battery pack structure can be rapidly and effectively evaluated, and engineering technicians are helped to carry out risk prediction on the power battery pack, so that the power battery pack is optimized in a targeted manner, and the performance of the power battery pack is improved.
Owner:NANJING NAVECO AUTOMOBILE CO LTD
All-condition simulation modeling method and system for radial turbine based on particle swarm optimization
InactiveCN108647391AReduce simulation errorArtificial lifeDesign optimisation/simulationLocal optimumSimulation
The invention discloses an all-condition simulation modeling method and system for a radial turbine based on particle swarm optimization for compressed-air energy storage. The method comprises the steps of: determining an input quantity, an output quantity and model parameters of a dynamic radial turbine simulation model; establishing a radial turbine simulation model for calculating the frictionloss and incidence loss of the radial turbine, and optimizing the process of solving the radial turbine simulation model; solving the optimization problem using the particle swarm optimization to obtain the output quantity of the radial turbine simulation model; reducing the simulation error caused by falling into local optimal value by using a loop iterative processing method; and building an all-condition simulation module of the radial turbine based on the particle swarm optimization on a Matlab / Simulink platform, wherein the module can be freely combined with other models in the Matlab / Simulink. The simulation model obtained can effectively show the running condition of the radial turbine under all conditions, and has a low simulation error.
Owner:HUAZHONG UNIV OF SCI & TECH
Radio frequency energy deposition prediction and monitoring method, device, equipment and medium
PendingCN113017598AReduce simulation errorAccurate predictionDiagnostic recording/measuringDesign optimisation/simulationRadio frequency energyStructure based
The embodiment of the invention discloses a radio frequency energy deposition prediction and monitoring method, device, equipment and medium, and the prediction method comprises the steps: collecting a magnetic resonance scanning structure image of a scanning object, carrying out the tissue segmentation based on the structure image, and building a three-dimensional biological model of the scanning object; establishing a biological electromagnetic simulation model according to the three-dimensional biological model; establishing a multi-channel radio frequency coil model according to a preset scanning strategy, and simulating and confirming a radio frequency energy deposition value in combination with the biological electromagnetic simulation model and the multi-channel radio frequency coil model. The monitoring method comprises the following steps: predicting a radio frequency energy deposition value according to the prediction method, and adjusting a scanning strategy according to a prediction result. According to the technical scheme provided by the embodiment of the invention, the SAR value of the scanned object can be predicted more accurately and individually under the technical scene of parallel transmission of the multi-channel transmitting coil, and the safety of the scanned object during magnetic resonance scanning is improved.
Owner:SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
Inrush Current Simulation Method and Device for UHV Transformer No-Load Closing
ActiveCN104200055BCorrected anhysteretic magnetizationEnable accurate simulationSpecial data processing applicationsHysteresisMagnetic susceptibility
The invention provides an excitation inrush current simulation method and device for an ultra-high voltage transformer under a condition of no-load closing. The excitation inrush current simulation method comprises the following steps: on the basis of the transitional area between the linear area and the non-linear area of the non-hysteresis curve, non-hysteresis magnetization intensity indicated by Langvin function is corrected; the corrected non-hysteresis magnetization intensity is utilized to establish a J-A magnetic hysteresis model; the parameters of the J-A magnetic hysteresis model are recognized; an analysis is conducted on the ultra-high voltage transformer and the differential magnetic susceptibility equation is determined; through the J-A magnetic hysteresis model and the differential magnetic susceptibility equation, the excitation inrush current of the ultra-high voltage transformer under the empty charging condition is determined. The excitation inrush current simulation method and device for the ultra-high voltage transformer under the condition of non-load losing correct the non-hysteresis magnetization intensity, enable the transitional area between the linear area and saturation area of the non-hysteresis curve to be closer to a true value and accurately simulate the magnetization characteristics of the transformer; moreover, the special construction of the ultra-high voltage transformer is considered and the excitation inrush current of the ultra-high voltage transformer under the condition of empty charging is simulated. Errors in the simulation are reduced.
Owner:STATE GRID CORP OF CHINA +3
Distribution Network Reliability Evaluation Method Considering Load Characteristics and Distributed Generation Access
ActiveCN109103874BIn line with actual operating conditionsReliability Index Prediction ImprovementLoad forecast in ac networkSingle network parallel feeding arrangementsEvaluation resultIslanding
The invention provides a distribution network reliability evaluation method considering load characteristics and distributed power access, which fully considers different user types and time-series load characteristics in different seasons, so that the evaluation results are more in line with the actual operating conditions of the power grid; At the same time, the island support effect of distributed power access on the distribution network is also considered, so that the scope of application of this evaluation method is wider and it can cope with more diverse power distribution scenarios. The existing distribution network reliability evaluation usually does not consider the timing change of the load, and the peak load is used for simulation, which will inevitably amplify the impact of the fault. However, the present invention considers load characteristics such as load timing characteristics and user types in the reliability evaluation. It can improve the prediction results of the reliability index of the load point and the system, and be closer to the actual value.
Owner:FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
Free-form optical reflector for LED (light-emitting diode) motorcycle low beam
The invention discloses a free-form optical reflector for an LED (light-emitting diode) motorcycle low beam, wherein an internal surface of the reflector is a free-form surface to form an optical reflecting surface; the bottom surface of the reflector is provided with an opening for installation of an LED; one end rightly facing the bottom surface is a light exit port of the reflector; the majority of light emitted by the LED light source is reflected by the internal surface of the reflector and then is emergent to an illuminating plane, and the other light is directly emergent to the illuminating plane. The reflector is divided into an upper part and a lower part; the free-form surface at the upper part of the internal surface of the reflector is mainly used for reflecting the light above a horizontal plane to the illuminating plane below the horizontal plane; the free-form surface at the lower part of the internal surface of the reflector is mainly used for gathering diffused light below the horizontal plane to the illuminating plane below the horizontal plane. The free-form optical reflector for the LED motorcycle low beam has the characteristics of simple structure, convenience in installation and high utilization rate of light energy; light direction can be effectively controlled and the glare effect can be inhibited; and the free-form optical reflector for the LED motorcycle low beam meets the light distribution requirements in GB5948-1998.
Owner:SOUTH CHINA UNIV OF TECH
A cycloidal tooth profile curve simulation method and system for a reducer
ActiveCN109446709BImprove reliabilityHigh precisionGeometric CADDesign optimisation/simulationAlgorithmClassical mechanics
Owner:WENZHOU UNIVERSITY
Simulation method for motion control of changeable rotating center of dynamic positioning ship
ActiveCN110456658AReduce simulation errorAccurately reflectSimulator controlCentre of rotationEngineering
The invention provides a simulation method for motion control of a changeable rotating center of a dynamic positioning ship. The method comprises the steps of calculating a switching matrix of a shiprotating center speed and a ship center speed through the position of a rotating center point in a hull coordinate system; calculating a motion state of the rotating center point; calculating a desired motion state; calculating a relative position coordinate of each propeller; calculating a new propeller position arrangement matrix; calculating desired thrust and desired rotation azimuth angle ofeach propeller; synthesizing the actually output thrust of the propellers at the rotating center to form resultant force; calculating the motion state at the rotating center point; calculating a position and an attitude in a northeast coordinate system; and calculating the position of the rotating center. According to the simulation method, the tasks, such as fixed-point positioning and path tracking after the rotating center of the dynamic positioning ship is changed can be effectively simulated, so that the simulation error is reduced, the actual situation can be really reflected and technical support can be provided for motion control of the changeable rotating center of an actual dynamic positioning system.
Owner:HARBIN ENG UNIV
Remote sensing imaging simulation method and device
ActiveCN109300120BReduce cost inputLow implementation costImage enhancementImage analysisEngineeringOptical transducers
The embodiment of the invention provides a remote sensing imaging simulation method and a device, which relate to the technical field of computer simulation and are used for simulating the imaging result of a satellite optical sensor. The method includes: acquiring a first image; Determining a downsampling region in the first image according to downsampling parameters and imaging mode parameters of the optical sensor; Performing down-sampling processing on pixels in the down-sampling area to obtain a second image; The second image is adjusted according to the imaging mode parameters to obtaina remote sensing imaging simulation image based on the imaging mode parameters. The method can simplify the simulation process of satellite remote sensing imaging and reduce the cost and difficulty ofsatellite remote sensing imaging simulation.
Owner:CAPITAL NORMAL UNIVERSITY +1
A simplification method of power system network avoiding negative resistance
ActiveCN105811413BImprove dynamic equivalence accuracyAvoid it happening againAc network circuit arrangementsTransient stateElectrical resistance and conductance
The invention discloses a power system network simplifying method capable of avoiding negative resistance. The power system network simplifying method includes: S10, eliminating N to-be-eliminated nodes, merging constant impedance load values of the N to-be-eliminated nodes, and performing transfer processing, wherein a to-be-processed power system network comprises at least one to-be-eliminated node and N is a positive integer; S20, simplifying the to-be-processed power system network which does not contain constant impedance load to obtain a standard-form power system network; S30, performing load flow calculation and transient stability calculation on the to-be-processed power system network and the standard-form power system network respectively; S40, comparing load flow results and transient curves of the two networks; if load flow error or transient error is less than a set threshold value, completing network simplifying; if not, changing a merging scheme, namely repeating the S10 after the to-be-eliminated nodes are arranged and combined. A CSR network simplifying method and a load transfer idea are applied, so that efficient and practical network simplifying is realized and negative resistance can be avoided effectively.
Owner:ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
Method for improving full-dynamic ground simulation authenticity in inertial navigation
ActiveCN102914225BValidate navigation solution performanceImproving the Reality of Inertial Navigation SimulationAmmunition testingAccelerometerComputer science
The invention relates to a method for improving full-dynamic ground simulation authenticity in inertial navigation. The method for improving the full-dynamic ground simulation authenticity in the inertial navigation comprises the steps of sampling an original property signal of a sensor of an inertial navigation accelerometer, and generating a digital signal comprising an original acceleration signal of the accelerometer and a position signal characteristic; and converting the digital signal into an analogue signal through a hardware control card, and sending the control analogue signal to an inertial navigation system in a pulse manner. When a missile is launched, a sent escape signal is manually controlled through hardware collection. A fixed time interval is set by the signal according to a working state of actual inertial navigation; and an order of converting inertial navigation into navigation is sent to the inertial navigation at certain time interval. With the adoption of the method provided by the invention, the inertial navigation system is more similar to an actual flight working state, so that the confidence of a semi-physical simulation test of a missile guidance system can be improved.
Owner:JIANGXI HONGDU AVIATION IND GRP
An Equivalent Method of Electromagnetic and Electromechanical Transient Hybrid Simulation Electromagnetic Side System
InactiveCN104615479BImproved Accuracy of Electromechanical Transient SimulationReduce simulation errorSoftware simulation/interpretation/emulationVoltage amplitudeTransient state
The invention discloses an electromagnetic and electromechanical transient mixed simulation electromagnetic side system equivalent method, which belongs to the technical field of power system simulation. The method is suitable for commercial electromagnetic transient simulation platforms; it includes the steps of: extracting the positive-sequence phasor of voltage fundamental wave and the positive-sequence phasor of fundamental wave of current at each interface bus; calculating the active power P and Reactive power Q; transfer P, Q, interface positive sequence voltage amplitude U, and phase angle difference between each interface voltage as the equivalent information at interface k to the electromechanical transient simulation platform; construct the corresponding iterative coefficient matrix, and use Iterative calculation of node voltage for electromechanical transient simulation. This method can effectively reduce the simulation error brought by the equivalent model of the electromagnetic side to the electromechanical transient simulation, especially to significantly improve the accuracy of the electromechanical transient simulation of the electromechanical side system during a fault.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
A Dynamic Positioning Vessel Variable Rotation Center Motion Control Simulation Method
ActiveCN110456658BReduce simulation errorAccurately reflectSimulator controlCentre of rotationEngineering
The invention provides a motion control simulation method of variable rotation center of a dynamically positioned ship, which calculates the speed of the center of rotation of the ship and the switching matrix of the center speed of the ship through the position of the center of rotation in the coordinate system of the ship, and calculates the motion state of the center of rotation. Calculate the expected motion state, calculate the relative position coordinates of each propeller, calculate the new propeller position layout matrix, calculate the expected thrust and expected rotation azimuth of each propeller, and synthesize the thrust actually output by the propeller to the center of rotation , form a resultant force, calculate the motion state at the center of rotation, calculate the position and attitude in the northeast coordinate system, and calculate the position of the center of rotation. The invention can effectively simulate tasks such as fixed-point positioning and path tracking after the dynamic positioning ship changes the rotation center, reduces the simulation error, can truly reflect the actual situation, and can provide motion control for the actual dynamic positioning system variable rotation center provide technical support.
Owner:HARBIN ENG UNIV
Simulation Model Circuit and Simulation Method for Realizing Radio Frequency Identification
ActiveCN107368616BHigh precisionReduce simulation errorComputer aided designSpecial data processing applicationsSignal waveAlgorithm
Owner:SEMICON MFG INT (SHANGHAI) CORP +1
Simulation modeling method and system for full working conditions of radial turbine based on particle swarm optimization
InactiveCN108647391BReduce simulation errorArtificial lifeDesign optimisation/simulationSi modelSimulation
The invention discloses an all-condition simulation modeling method and system for a radial turbine based on particle swarm optimization for compressed-air energy storage. The method comprises the steps of: determining an input quantity, an output quantity and model parameters of a dynamic radial turbine simulation model; establishing a radial turbine simulation model for calculating the frictionloss and incidence loss of the radial turbine, and optimizing the process of solving the radial turbine simulation model; solving the optimization problem using the particle swarm optimization to obtain the output quantity of the radial turbine simulation model; reducing the simulation error caused by falling into local optimal value by using a loop iterative processing method; and building an all-condition simulation module of the radial turbine based on the particle swarm optimization on a Matlab / Simulink platform, wherein the module can be freely combined with other models in the Matlab / Simulink. The simulation model obtained can effectively show the running condition of the radial turbine under all conditions, and has a low simulation error.
Owner:HUAZHONG UNIV OF SCI & TECH
Automobile suspension KC simulation analysis method and device
PendingCN114282301AImplement autostartImprove efficiencyGeometric CADDesign optimisation/simulationBatch processingProcess engineering
The invention discloses an automotive suspension Kamp. The invention discloses a C simulation analysis method and device. The method comprises the steps that a preset basic information template and a preset working condition template are obtained; for each simulation working condition, generating a file header of the simulation working condition according to the basic information template, and generating a file body of the simulation working condition according to the working condition template; generating a solving file of the simulation working condition according to the file header and the file body; constructing a batch processing file and a command driving file according to the file information of the solving files of the plurality of simulation working conditions; according to the batch processing file and the command driving file, ADAMS software is started to conduct batch simulation calculation on the solution files of the multiple simulation working conditions, and a simulation analysis result is output. According to the method, manual participation in adjustment and simulation is not needed in the whole simulation process, batch simulation calculation and customized output can be achieved, the efficiency and reliability of a large amount of simulation calculation in the field of vehicle engineering are greatly improved, and simulation errors are reduced.
Owner:DONGFENG MOTOR GRP
Real-time control system and method for depth simulator
InactiveCN101984378BReduce simulation errorHigh static precisionSimulator controlReal-time Control SystemHydraulic pump
The invention discloses a real-time control system and real-time control method for a depth simulator. A hydraulic pump station provides an oil source so that a pressure cavity generates corresponding pressure; one path of the pressure is applied onto a user sensor, and the other path is applied onto a double-range pressure sensor; a feedback voltage signal of the double-range pressure sensor acquired by PCI-1716 is transmitted to an industrial control computer and is converted into a pressure intensity signal serving as a system feedback value; the industrial control computer receives a digital depth signal transmitted by an emulation host into a pressure intensity signal serving as a reference input value of a depth simulator system, calculates an error amount and performs PID operationand converts the calculated value amount representing the depth into a voltage signal; and the open size and in / out oil of an electro-hydraulic servo valve are controlled by a PCI-1723 data output card so that a working cavity generates corresponding pressure. The invention ensures low delay and high real-time performance, reduces the emulation error and improves the control precision.
Owner:JIANGSU ZHONGKUANG HEAVY EQUIP CO LTD +1
Finite element sub-model boundary condition loading method
ActiveCN112818479AReduce simulation errorAccurate and reliable boundary conditionsGeometric CADDesign optimisation/simulationStructural engineeringMechanics
The invention discloses a finite element sub-model boundary condition loading method, and belongs to the technical field of finite element simulation. According to the finite element sub-model boundary condition loading method, by extracting overall model node coordinates and adopting coordinate transformation and nonlinear fitting modes, sub-model boundary condition loading under a large deformation gradient is achieved, and mutual transformation between a three-dimensional model and a two-dimensional model is achieved. According to the method, node displacement extracted from the whole model is fitted by adopting a nonlinear fitting method, and is loaded to the sub-model as a boundary condition, so that the established boundary condition is more accurate and reliable, and finite element simulation errors can be greatly reduced; according to the method, the node displacement is extracted by adopting an external script, and the node displacement on the whole model is converted by adopting a coordinate conversion method, so that sub-model loading of different dimensions and different unit types can be realized, the application range of a finite element sub-model method is greatly expanded, and the method has wide application value.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Power system network simplifying method capable of avoiding negative resistance
ActiveCN105811413AImprove dynamic equivalence accuracyAvoid it happening againAc network circuit arrangementsElectrical resistance and conductanceTransient state
The invention discloses a power system network simplifying method capable of avoiding negative resistance. The power system network simplifying method includes: S10, eliminating N to-be-eliminated nodes, merging constant impedance load values of the N to-be-eliminated nodes, and performing transfer processing, wherein a to-be-processed power system network comprises at least one to-be-eliminated node and N is a positive integer; S20, simplifying the to-be-processed power system network which does not contain constant impedance load to obtain a standard-form power system network; S30, performing load flow calculation and transient stability calculation on the to-be-processed power system network and the standard-form power system network respectively; S40, comparing load flow results and transient curves of the two networks; if load flow error or transient error is less than a set threshold value, completing network simplifying; if not, changing a merging scheme, namely repeating the S10 after the to-be-eliminated nodes are arranged and combined. A CSR network simplifying method and a load transfer idea are applied, so that efficient and practical network simplifying is realized and negative resistance can be avoided effectively.
Owner:ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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