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31 results about "Bond graph" patented technology
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A bond graph is a graphical representation of a physical dynamic system. It allows the conversion of the system into a state-space representation. It is similar to a block diagram or signal-flow graph, with the major difference that the arcs in bond graphs represent bi-directional exchange of physical energy, while those in block diagrams and signal-flow graphs represent uni-directional flow of information. Bond graphs are multi-energy domain (e.g. mechanical, electrical, hydraulic, etc.) and domain neutral. This means a bond graph can incorporate multiple domains seamlessly.
Power electronic system fault diagnosis method based on bond graph
The invention discloses a power electronic system fault diagnosis method based on a bond graph. The power electronic system fault diagnosis method comprises the following steps of (1) combining a modulation transformer MTF of a standard bond graph element and a resistive element R to construct a switch bond graph element with a fixed causal relationship; (2) constructing a behavior bond graph model of a power electronic system to simulate running states of the system during normal working and under failure; (3) constructing a global analytical redundancy relation with an independent structure in the model, obtaining a circuit fault feature matrix and system running residue set, and comparing the set with a fault feature matrix to determine the health state of the system and position a faulted element. A bond graph modeling and fault diagnosis method provided by the invention can be used for performing uniform modeling and fault diagnosis on a multi-energy-domain system such as electromechanics, so that the problem that mistakes are easily made in the conventional method for respectively modeling different energy domains and combining energy domain models is solved; a solution based on a bond graph method is supplied to multi-energy-domain system modeling and fault diagnosis based on a model method.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
IGBT fault diagnosis method for traction drive system of CRH5 type high-speed train
ActiveCN105301470AGuaranteed uptimeFailure is timely and effectiveIndividual semiconductor device testingGraph modelBond graph
The invention discloses an IGBT fault diagnosis method for a traction drive system of a CRH5 type high-speed train, and the method comprises the steps: modeling a traction part bonding graph: respectively building a traction inverter model, a traction motor model, and a gearbox bonding graph model; carrying out system modeling: building a traction drive system model of a high-speed train, and simulating the operation states when the system is normal and an IGBT fault happens; building a global analysis redundancy relation: building a simplified system global analysis redundancy relation, obtaining a fault characteristic matrix, and analyzing a system fault propagation approach; carrying out fault diagnosis: enabling system output to be substituted into the global analysis redundancy relation, forming a residual error set and a consistency vector, comparing the residual error set and the consistency vector with the fault characteristic matrix, and detecting the health state of the system, and positioning an IGBT fault source. The method diagnoses the IGBT fault of the traction drive system of the high-speed train through employing a bonding graph method, builds the motor model through multiple bonding graphs, carries out the unified modeling of an electromechanical system, achieves the positioning of an IGBT element with a fault, and provides a solution for the modeling of the traction drive system of the CRH5 high-speed train and the diagnosis of the IGBT fault.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Fault diagnosis method of nonlinear electromechanical system
ActiveCN108398637AQuarantine in timeAvoid interferenceDynamo-electric machine testingState variableDiagnosis methods
The invention relates to a fault diagnosis method of a nonlinear electromechanical system, in particular to the fault diagnosis method of the nonlinear electromechanical system. The fault diagnosis method comprises the following steps: firstly, modeling the nonlinear electromechanical system to obtain a bonding graph model of the nonlinear electromechanical system, and then to obtain an analysis redundancy relation and a fault feature matrix successively, analyzing the detectability and the separability of the fault of the nonlinear electromechanical system to obtain a set of possible faults of the nonlinear electromechanical system, and finally, performing the joint parameter estimation on the set of possible faults of the nonlinear electromechanical system and the state variables of thenonlinear electromechanical system through a particle filtering method, then comparing the sample mean value of the particle distribution with the nominal value of the model as the parameter estimatedvalue, and determining the fault of the nonlinear electromechanical system. According to the invention, the fault parameters can be accurately detected in a small range interval through fault identification, and the fault source can be diagnosed and isolated in time and accurately.
Owner:HEFEI UNIV OF TECH
Numerical control machining parameter adaptive fuzzy control rule optimization method
ActiveCN103197596AAchieve intersectionalityAchieve consistencyNumerical controlNumerical controlFuzzy control system
The invention discloses a numerical control machining parameter adaptive fuzzy control rule optimization method. The method includes the following steps: step1, parameter operation of a numerical control machine tool drive system is created, an input variable and an output variable of an adaptive fuzzy control model are confirmed, and a value taking interval is confirmed according to practical machining conditions; step 2, a drive system module of a numerical control machine tool is analyzed and confirmed, a bond graph method is utilized to obtain a simulative effect picture of corresponding change relations of an input language variable and an output language variable; step3, combining the step 1 with the step 2 and according to the simulative effect picture, the change relations among the variables are analyzed, and dynamic optimization is carried out on a fuzzy control rule list. According to the numerical control machining parameter adaptive fuzzy control rule optimization method, a power bond graph method is utilized to optimize fuzzy control rules. The numerical control machining parameter adaptive fuzzy control rule optimization method is used on on-line adaptive control of numerical control machining parameters, the control performance and the machining stability of a fuzzy controller are improved.
Owner:TIANJIN UNIV
Model based IGBT open-circuit fault diagnosis method for traction inverter of CRH3 electric multiple unit
InactiveCN105243258AElectrical testingSpecial data processing applicationsModel methodControl system
The invention discloses a model based IGBT open-circuit fault diagnosis method for a traction inverter of a CRH3 electric multiple unit. The method comprises the steps of (1) establishing a bond-graph model of the traction inverter; (2) deducing a system behavior constraint equation of the model; (3) based on the system behavior constraint equation, identifying the state of each current switch by utilizing a least square method; (4) performing difference operation on each IGBT pulse signal (represented by 0 or 1) given by a control system and the state (represented by 0 or 1) of each current switch to obtain six fault identification vectors; and (5) if an element in the fault identification vectors is greater than 0, indicating that an open-circuit fault occurs to a corresponding IGBT. According to the model based IGBT open-circuit fault diagnosis method for the traction inverter of the CRH3 electric multiple unit, when faults occur to any one or two IGBTs, the faults can be detected and positioned quickly and accurately; and the problem that a model based method cannot complete multi-fault identification in the field is solved.
Owner:SOUTHWEST JIAOTONG UNIV
Quick simulation analysis method for radar antenna servo system
ActiveCN104298812AImprove modeling efficiencyAccelerate Simulation AnalysisSpecial data processing applicationsSystems designRadar
The invention discloses a quick simulation analysis method for a radar antenna servo system. The quick simulation analysis method includes the steps that (1) parametric modeling of a bond graph is carried out, components in the system are simplified according to the modeling sequence of a drive motor, a transmission mechanism and a reflecting surface body and accordingly a bond graph model of the antenna servo system is built; (2) virtual prototype multi-rigid-body modeling is carried out, part rigid-body models in all links are sequentially built on the basis of the modeling theory that each solid body in the system corresponds to one rigid body in a multi-rigid-body model, the corresponding rigid bodies are combined according to a parametric model of the bond graph and accordingly a system design model is obtained; (3) a parameter synchronization mechanism is introduced, and design model parameters are transferred to the bond graph model synchronously by means of a design model information file; (4) a system mathematic model is deducted according to the system bond graph model. Mathematical modeling simulation, multi-rigid-body modeling simulation and bond graph modeling simulation methods are well combined, advantages are made use of and defects are avoided.
Owner:XIDIAN UNIV
Bayesian network-based high-speed rail traction system fault prediction method
ActiveCN109614647AIn line with the actual situationImprove practicalityForecastingDesign optimisation/simulationNODALClosed loop
The invention discloses a Bayesian network-based high-speed rail traction system fault prediction method. The method comprises the following steps of: 1, establishing a closed-loop bonding graph model: adding a direct torque control module into an original bonding graph model; 2, building a Bayesian network: firstly determining nodes of a Bayesian network structure, determining the structure of the Bayesian network according to the causal relationship between the nodes provided by the closed-loop bonding graph model, and finally opening a closed loop in the Bayesian network; 3, data preprocessing: filtering and denoising the original signal, extracting features, monotonically screening and extracting deep features, and finally, carrying out k-feature extraction on the features; performingmeans clustering; and 4, fault prediction: carrying out supervised learning by using an EM algorithm, obtaining the state of an online measured value by using the data preprocessing method, and carrying out classification by using a Bayesian network to obtain the residual life range of the equipment. Equipment fault prediction can be realized, and the method is more practical and reliable.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Electric scooter fault diagnosis and estimation method based on bond graph model
ActiveCN108437798ATimely diagnosis and isolationAccurate diagnosis and isolationElectric devicesDesign optimisation/simulationState variableDiagnosis methods
The invention relates to an electric scooter fault diagnosis method, in particular to an electric scooter fault diagnosis and estimation method based on a bond graph model. Firstly, the model is established for an electric scooter, so that the bond graph model of the electric scooter is obtained, a redundant relationship is analyzed according to the bond graph model of the electric scooter, a residual error is generated according to the analyzed redundant relationship, a fault characteristic matrix is obtained, the parameter values of the bond graph model of the electric scooter are changed, whether the residual error exceeds a set threshold value or not is judged, if the residual error exceeds the set threshold value, an electric scooter system generates a fault, coherent vectors and thefault characteristic matrix are compared, a possible fault set is obtained, elements in the fault set and system original state variables are jointly estimated through an unscented Kalman filter method, and the actual fault of the electric scooter system is obtained. Fault parameters can be accurate to specific numerical values through fault identification, and a fault source can be diagnosed andisolated accurately in time.
Owner:HEFEI UNIV OF TECH
Gradual fault diagnosis and life prediction method of uncertain sophisticated circuit system
ActiveCN110441669ASensitive and reliable detectionAccurate estimateElectronic circuit testingSpecial data processing applicationsUltrasound attenuationFault occurrence
A gradual fault diagnosis and life prediction method of an uncertain sophisticated circuit system is provided. The method comprises the following steps: S1, performing modeling on the uncertain sophisticated circuit system, to obtain an uncertainty global diagnosis sophisticated bond graph model; S2, obtaining augmented global analytical redundancy relations AGARRs, obtaining a global adaptive threshold by using the augmented global analytical redundancy relations AGARRs, and performing fault detection on the sophisticated circuit system when a parameter is uncertain; S3, analyzing structuralcharacteristics of the augmented global analytical redundancy relations AGARRs, to provide a global fault characteristic matrix of the system, to isolate a possible fault on this basis; and S4, approaching the gradual fault by using a degradation model of a time-varying attenuation rate, estimating a fault value and a fault occurrence time by using an enhanced expansion Kalman filtering algorithm,calculating a gradual degradation model coefficient, and predicting a remaining useful life of a fault element. The foregoing method can be used to implement fault diagnosis and remaining useful lifeprediction.
Owner:HEFEI UNIV OF TECH
A Method of Optimizing Adaptive Fuzzy Control Rules for NC Machining Parameters
ActiveCN103197596BAchieve consistencyImprove controllabilityNumerical controlNumerical controlFuzzy control system
The invention discloses a numerical control machining parameter adaptive fuzzy control rule optimization method. The method includes the following steps: step1, parameter operation of a numerical control machine tool drive system is created, an input variable and an output variable of an adaptive fuzzy control model are confirmed, and a value taking interval is confirmed according to practical machining conditions; step 2, a drive system module of a numerical control machine tool is analyzed and confirmed, a bond graph method is utilized to obtain a simulative effect picture of corresponding change relations of an input language variable and an output language variable; step3, combining the step 1 with the step 2 and according to the simulative effect picture, the change relations among the variables are analyzed, and dynamic optimization is carried out on a fuzzy control rule list. According to the numerical control machining parameter adaptive fuzzy control rule optimization method, a power bond graph method is utilized to optimize fuzzy control rules. The numerical control machining parameter adaptive fuzzy control rule optimization method is used on on-line adaptive control of numerical control machining parameters, the control performance and the machining stability of a fuzzy controller are improved.
Owner:TIANJIN UNIV
High-speed motorized spindle thermal error modeling method based on bonding graph
ActiveCN113110295ASolve the problem that the singularity cannot be analyzedQuick analysisProgramme controlComputer controlThermodynamicsMathematical model
The invention discloses a high-speed motorized spindle thermal error modeling method based on a bonding graph. The method comprises the following steps: 1, constructing a high-speed motorized spindle bearing temperature field bonding graph model; 2, constructing a motor stator temperature field bonding graph model; 3, constructing a motor rotor temperature field bonding graph model; 4, according to the specific structure of the high-speed motorized spindle, connecting the temperature field bonding graph models established in the steps 1 to 3 to establish a complete high-speed motorized spindle thermal error system temperature field bonding graph model; 5, establishing a thermal error mathematical model of the high-speed motorized spindle; and 6, performing system simulation according to the model, and analyzing to obtain the thermal error of the high-speed motorized spindle. According to the method, a bonding graph modeling method is adopted, all parts are convenient to connect and add, the high-speed motorized spindle system temperature field with various energy forms can be directly modeled and analyzed; therefore, the problem that singular points which cannot be analyzed are generated is solved, and the rapidity and accuracy of modeling, simulation and analysis of the high-speed motorized spindle system are improved.
Owner:HARBIN UNIV OF SCI & TECH
Bond-graph-based movable mechanical arm system and modeling method thereof
ActiveCN109176524AImprove speedImprove reliabilityProgramme-controlled manipulatorDrive motorBond graph
Owner:上海神添实业有限公司
Engineering design method based on bond graph and genetic programming
InactiveCN103886140AComplex engineering designLong-term optimal solution searchGenetic modelsSpecial data processing applicationsApplicability domainGenetic programming algorithm
The invention relates to the technical field of engineering design, in particular to an engineering design method for conducting automated evolution design on mixing field systems or various different field systems based on a bond graph tool and a genetic programming algorithm. The method includes the steps of assigning an embryo physical structure diagram, conducting user input, setting up an initial population of a genetic programming tree, conducting ontoanalysis, conducting evolution operation and ending judgment. Compared with the prior art, the design method is high in expansibility, wide in application range, high in efficiency, high in normalization and capable of designing a complex project meeting the requirements of a designer through an automated method.
Owner:SHANTOU UNIV
Electric drive system multi-field coupling optimization method based on bonding graph modeling
ActiveCN110866315AEase of StateEasy to addGeometric CADDesign optimisation/simulationElectric machineReduction drive
The invention discloses an electric drive system multi-field coupling optimization method based on bonding graph modeling. The method comprises the following steps: S1, establishing a permanent magnetmotor bonding graph model; S2, establishing a speed reducer bonding graph model; S3, establishing an electric drive system bonding graph model, and deriving a state equation of the electric drive system bonding graph model; and S4, inputting simulation parameters, and correcting the electric drive system bonding graph model. By adopting the technical scheme, the energy transfer process of the electric drive system is clearly described, the dynamic characteristics of the electric drive system can be dynamically reflected in real time, and a theoretical basis is provided for the optimal designof the electric drive system.
Owner:CHONGQING UNIV
Distributed fault diagnosis method for circuit system
ActiveCN109116219APrecise positioningReduce complexityElectronic circuit testingDiagnosis methodsSingle fault
The invention discloses a distributed fault diagnosis method for a circuit system. The distributed fault diagnosis method comprises: modeling is carried out on a circuit system and causal relationships between various parameters are configured to obtain a global diagnostic bond graph model of the circuit system; a minimum sub system based on each sensor is extracted from the circuit system by using all sensors in the circuit system as basic units and measuring values of sensors as local outputs of the circuit system to obtain local diagnostic bond graph models of all minimum sub systems respectively; according to the local diagnostic bond graph models of the minimum sub systems, a distributed analytical redundancy relationship is obtained, and the distributed analytical redundancy relationship is analyzed to obtain a distributed fault feature matrix; and on the basis of the distributed fault feature matrix, fault diagnosis is carried out. According to the invention, under the conditions of single fault and multiple faults, the performance of fault isolation is improved effectively; the complexity of subsequent fault component identification is reduced; and the diagnostic speed anddiagnostic accuracy of the fault are enhanced.
Owner:HEFEI UNIV OF TECH
Speed reducer bonding graph model optimization method based on six-degree-of-freedom gear engagement model
The invention discloses a speed reducer bonding graph model optimization method based on a six-degree-of-freedom gear engagement model. The speed reducer bonding graph model optimization method comprises the following steps: S1, establishing a six-degree-of-freedom first-stage gear pair engagement kinetic model; S2, establishing a six-degree-of-freedom first-stage gear pair bonding graph model; S3, deducing a state equation of the first-stage gear pair bonding graph model; S4, establishing a speed reducer bonding graph model; S5, deriving a state equation of the speed reducer bonding graph model; S6, performing simulation analysis on the state equation of the speed reducer bonding graph model, and correcting the speed reducer bonding graph model. By the adoption of the technical scheme, the built gear pair bonding graph model and the built speed reducer bonding graph model can accurately analyze the characteristics of the speed reducer and the characteristics of other gear transmissionmechanisms, and a theoretical basis is provided for optimization design of the speed reducer and other gear transmission systems.
Owner:CHONGQING UNIV
A Fault Diagnosis Method for Nonlinear Electromechanical Systems
ActiveCN108398637BQuarantine in timeAvoid interferenceDynamo-electric machine testingState variableGraph model
The invention relates to a fault diagnosis method of a nonlinear electromechanical system, in particular to the fault diagnosis method of the nonlinear electromechanical system. The fault diagnosis method comprises the following steps: firstly, modeling the nonlinear electromechanical system to obtain a bonding graph model of the nonlinear electromechanical system, and then to obtain an analysis redundancy relation and a fault feature matrix successively, analyzing the detectability and the separability of the fault of the nonlinear electromechanical system to obtain a set of possible faults of the nonlinear electromechanical system, and finally, performing the joint parameter estimation on the set of possible faults of the nonlinear electromechanical system and the state variables of thenonlinear electromechanical system through a particle filtering method, then comparing the sample mean value of the particle distribution with the nominal value of the model as the parameter estimatedvalue, and determining the fault of the nonlinear electromechanical system. According to the invention, the fault parameters can be accurately detected in a small range interval through fault identification, and the fault source can be diagnosed and isolated in time and accurately.
Owner:HEFEI UNIV OF TECH
A igbt fault diagnosis method for crh5 type high speed train traction drive system
ActiveCN105301470BAvoid the disadvantages that modeling is not easy to implementClear structureIndividual semiconductor device testingGraph modelBond graph
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
PCB ultrahigh gold wire bonding value processing method
InactiveCN110557903AMeet the requirementsSolving Gold Wire Bonding IssuesPrinted circuit assemblingRedoxSoft materials
The invention discloses a PCB ultrahigh gold wire bonding value processing method. The method comprises the following steps of etching, uniformly spraying etching liquid medicine to a surface of a copper foil through a spray head, carrying out a redox reaction with copper which is not protected by an etching resistance agent, reacting the unnecessary copper, exposing a base material, and carryingout film stripping treatment so as to form a line; soft gold electroplating, electroplating a layer of nickel on a PCB, and electroplating a layer of pure gold on the nickel; grinding and polishing, using a grinding tool and a dissociating abrasive to carry out micro finish machining precision on a surface of a processed workpiece, and using a soft material as the grinding tool for polishing; andgold wire bonding, connecting two welding spots of each bonding wire according to a position located by a bonding graph to achieve electrical and mechanical connection, and carrying out a bonding tension test after the bonded PCB is sealed with a glue. In the invention, a production requirement of gold wire bonding can be satisfied, a gold wire bonding requirement of the PCB can be effectively solved, product performance is improved, and the product meets a customer requirement. And company production efficiency and benefits are remarkably improved.
Owner:深圳市星河电路股份有限公司
Active fault-tolerant control method for nonlinear electromechanical system
PendingCN114840969AEasy fault detectionQuick responseDesign optimisation/simulationCAD circuit designLoop controlDynamic models
The invention discloses an active fault-tolerant control method for a nonlinear electromechanical system. The active fault-tolerant control method comprises the following steps: establishing an uncertainty diagnosis bonding graph model of the system; deducing an analysis redundancy relation and a dynamic model of the system according to the uncertainty diagnosis bonding graph model; designing and optimizing an adaptive threshold based on a particle swarm optimization algorithm to improve the fault detection performance under the parameter uncertainty condition; based on a recursive terminal sliding mode theory, a recursive terminal sliding mode control law, namely a closed-loop control law, of the system is designed, and load position tracking of the system in a healthy state is achieved; aiming at a parameter fault of the system, estimating an unknown parameter fault item in real time by utilizing an adaptive fuzzy system, compensating an estimated value into a control law, and designing an adaptive fuzzy recursive terminal sliding mode control law, namely a fault-tolerant control law, of the system; and when a parameter fault occurs in the system, the closed-loop control law is switched to the fault-tolerant control law, so that active fault-tolerant control on the parameter fault of the system is realized.
Owner:HEFEI UNIV OF TECH
Post-valve pressure compensation system parameter sensitivity analysis method
ActiveCN114396416ATroubleshooting Sensitivity Parameter CalculationsFluid-pressure actuator testingMathematical modelMathematical Graph
The invention discloses a downstream pressure compensation system parameter sensitivity analysis method, which comprises the following steps of: 1, constructing a power bonding graph model of a downstream pressure compensation system; 2, deducing a state equation of a downstream pressure compensation system; and 3, deducing a parameter sensitivity differential equation of the downstream pressure compensation system, and determining the parameter sensitivity. The invention provides a post-valve pressure compensation system parameter sensitivity analysis method, which establishes a post-valve pressure compensation system mathematical model based on a power bonding graph theory so as to solve the sensitivity analysis problem of a post-valve pressure compensation system, and aims to provide a post-valve pressure compensation system parameter sensitivity analysis method. And a research foundation and a theoretical basis are laid for analyzing key parameters influencing the dynamic characteristics of the load-sensitive proportional multi-way valve in the pressure compensation valve and optimizing the dynamic characteristics of the load-sensitive proportional multi-way valve and design parameters of the pressure compensation valve.
Owner:YANSHAN UNIV +1
A Fast Simulation Analysis Method for Radar Antenna Servo System
ActiveCN104298812BImprove modeling efficiencyAccelerate Simulation AnalysisSpecial data processing applicationsSystems designRadar
Owner:XIDIAN UNIV
Optimization method of bond graph model of reducer based on six-degree-of-freedom gear meshing model
Owner:CHONGQING UNIV
A Power Calculation Method of Ball Screw Type Energy Feed Shock Absorber
ActiveCN113468668BEasy Driving ControlsAchieve seamless connectionGeometric CADDesign optimisation/simulationMathematical modelBall screw
The invention discloses a power calculation method of a ball screw type energy-feeding shock absorber, which includes the following steps: converting the three-dimensional model into Adams to perform multi-rigid body modeling of a virtual prototype, and obtaining model parameters; establishing a power bonding graph model ; According to the power bond graph model, deduce the state equation of the power bond graph model; according to the state equation, establish the mathematical model of the shock absorber; according to the corresponding relationship between the bond graph element and the block diagram unit, convert the bond graph model Form a block diagram; according to the block diagram, set up a dynamic simulation model in Matlab-Simulink; input the model parameters obtained in the above steps, simulate and analyze the dynamic simulation model, and obtain the output power curve; use the present invention to realize the simulation under each working condition Simulation, simulation is fast.
Owner:YANGZHOU UNIV
Method and system for improving the quality of foamed asphalt
This application provides a method and system for improving the quality of foamed asphalt. The quality improving method includes: using the segmented centralized parameter bond graph method to establish a bond graph model of the piping system of the asphalt foaming device; The bond graph model is used to obtain the simulation model of the piping system of the asphalt foaming device; the user interface of the piping system of the asphalt foaming device is established, and the user interface is used to receive input parameters; the simulation model of the piping system of the asphalt foaming device communicates with its user interface, and the asphalt The simulation results of the simulation model of the piping system of the foaming device are displayed on the user interface; the time difference between asphalt and foaming water reaching the foaming chamber is obtained according to the simulation results; the time of spraying asphalt and the time of foaming water are respectively controlled according to the time difference. This application conducts online simulation of the dynamic characteristics of the piping system of the asphalt foaming device, and then controls the asphalt and foaming water to reach the foaming chamber at the same time according to the simulation results, so as to improve the quality of foamed asphalt.
Owner:INNER MONGOLIA UNIV OF TECH
Multi-field coupling optimization method for electric drive system based on bond graph modeling
ActiveCN110866315BEase of StateEasy to addGeometric CADDesign optimisation/simulationEnergy transferReduction drive
Owner:CHONGQING UNIV
Dynamic simulation system and method of integrated energy system
PendingCN114218739ASafe and stable operationDesign optimisation/simulationSpecial data processing applicationsIntegrated energy systemPower usage
The invention discloses a dynamic simulation system and method for an integrated energy system. The integrated energy system comprises a power network, a heat supply network and connectable coupling equipment connected between the power network and the heat supply network. The electric power network and the heat supply network are mutually coupled through the connectable coupling equipment, and the electricity and heat utilization requirements of users are met at the same time. According to the method, on the basis of a bonding graph theory, dynamic characteristics of the regional integrated energy system are combined, and a bonding graph model of main basic elements of the regional integrated energy system is established. According to the method, a state equation of the regional integrated energy system is further constructed and solved, a dynamic simulation result of the regional integrated energy system can be obtained by utilizing an output equation, the dynamic characteristics of the regional integrated energy system are fully considered, numerical simulation and analysis are performed on a certain actual regional integrated energy source through an example, and the dynamic simulation result of the regional integrated energy system is obtained. And an effective theoretical basis is provided for safe and stable operation of the regional comprehensive energy system.
Owner:STATE GRID HEBEI ELECTRIC POWER CO LTD +2
A Fault Diagnosis and Estimation Method for Electric Scooter Based on Bond Graph Model
ActiveCN108437798BTimely diagnosis and isolationAccurate diagnosis and isolationGeometric CADElectric devicesAlgorithmBond graph
The invention relates to an electric scooter fault diagnosis method, in particular to an electric scooter fault diagnosis and estimation method based on a bond graph model. Firstly, the model is established for an electric scooter, so that the bond graph model of the electric scooter is obtained, a redundant relationship is analyzed according to the bond graph model of the electric scooter, a residual error is generated according to the analyzed redundant relationship, a fault characteristic matrix is obtained, the parameter values of the bond graph model of the electric scooter are changed, whether the residual error exceeds a set threshold value or not is judged, if the residual error exceeds the set threshold value, an electric scooter system generates a fault, coherent vectors and thefault characteristic matrix are compared, a possible fault set is obtained, elements in the fault set and system original state variables are jointly estimated through an unscented Kalman filter method, and the actual fault of the electric scooter system is obtained. Fault parameters can be accurate to specific numerical values through fault identification, and a fault source can be diagnosed andisolated accurately in time.
Owner:HEFEI UNIV OF TECH
A Distributed Fault Diagnosis Method for Circuit System
ActiveCN109116219BPrecise positioningReduce complexityElectronic circuit testingSingle faultMultiple fault
The invention discloses a distributed fault diagnosis method of a circuit system. The sensor is the basic unit, the measured value of the sensor is the local output of the circuit system, the minimum subsystem based on each sensor is extracted from the circuit system, and the local diagnostic bond graph model of each minimum subsystem is obtained respectively; according to the minimum subsystem The local diagnosis bond graph model is used to obtain the distributed analytical redundancy relationship, and the distributed analytical redundancy relationship is analyzed to obtain a distributed fault characteristic matrix; fault diagnosis is performed according to the distributed fault characteristic matrix. The present invention effectively improves the performance of fault isolation in the case of single fault and multiple faults, reduces the complexity of subsequent fault component identification, and improves the fault diagnosis speed and diagnostic accuracy.
Owner:HEFEI UNIV OF TECH
A Bond Graph Based Mobile Manipulator System and Its Modeling Method
ActiveCN109176524BImprove reliabilityImprove accuracyProgramme-controlled manipulatorMathematical modelTheoretical computer science
The invention discloses a modeling method of a bond-graph-based movable mechanical arm system. The method comprises the steps of 1, constructing a driving motor and transmission mechanism bond graph model; 2,constructing a double-wheel differential type mobile robot mechanical system bond graph model; 3, constructing a series connection type mechanical arm mechanical system bond graph model; 4, according to the robot freedom degree, connecting the bond graph models established in step 1, step 2 and step 3, and establishing a complete robot system bond graph model by considering the force-bearing relationship between the system and the ground; 5, deriving a mathematic model according to the bond graph model; and 6, conducting system simulation and analysis according to the model. By means of the modeling method, errors caused by the operation that modeling and control are conducted on a mobile robot and a mechanical arm separately, but the coupling relationship between the mobile robotand the mechanical arm is neglected are avoided; the bond graph method is adopted, modeling and simulation problems of a robot system combining multiple energy forms are solved in a unified manner; and rapidness and precision of dynamics modeling, simulation and analysis of the robot system are improved.
Owner:上海神添实业有限公司
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