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1064 results about "Finite elemente analyse" patented technology
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System and method of anatomical modeling
InactiveUS20050018885A1Conveniently stored and compiledFlexible performanceCharacter and pattern recognition3D modellingAnatomical structuresElement analysis
Methods of modeling anatomical structures, along with pathology including the vasculature, spine and internal organs, for visualization and manipulation in simulation systems. A representation of on the human vascular network is built up from medical images and a geometrical model produced therefrom by extracting topological and geometrical information. The model is constructed using topological and geometrical information. The model is constructed using segments containing topology structure information, flow domain information contour domain information and skeletal domain information. A realistic surface is then applied to the geometric model, by generating a trajectory along a central axis of the geometric model, conducting moving trihedron modeling along the generated trajectory and then creating a sweeping surface along the trajectory. A novel joint reconstruction approach is also proposed whereby a part surface sweeping operation is performed across branches of the joint and then a surface created over the resultatn holes therebetween. A 3-D mesh may also be generated, based upon this model, for finite element analysis and pathology creation.
Owner:AGENCY FOR SCI TECH & RES
Virtual heart valve
ActiveUS8219229B2Accurate measurementFast formingHeart valvesAnalogue computers for chemical processesStress levelStructural engineering
Owner:EDWARDS LIFESCIENCES CORP
Composite internal fixators
ActiveUS20120059376A1Desired performanceInternal osteosythesisJoint implantsModel selectionElement analysis
A multi-layer, fiber-reinforced composite orthopaedic fixation device having a design selected based on a desired characteristic of the orthopaedic fixation device. The design may be selected according to a model of the device, the model defining design constraints, and the design may comprise a pattern of the fiber angle for each layer. The selection of a design may be analyzed using finite element analysis to determine whether the design will comprise the desired characteristic.
Owner:SMITH & NEPHEW INC
Method and Apparatus for Determining the Permeability of Earth Formations
ActiveUS20080306692A1Electric/magnetic detection for well-loggingSeismic signal processingRate of penetrationElement analysis
A method and apparatus for determining the fluid permeability of an earth formation is described. An instrument comprising an acoustic source and acoustic and electrokinetic sensors is located in a borehole at a site of interest. The acoustic source is fired and the resulting variations in pressure and electric field generated are measured and recorded. The Biot equation, and an equation for the streaming potential coupled to fluid displacement terms, is solved using finite element analysis to give an expected pressure waveform and electrokinetic waveform based on estimated earth formation properties. By comparison of the measured waveforms and those calculated from the equations, the actual permeability of the earth formation can be deduced.
Owner:SONDEX WIRELINE
Rapid production of engineering tools and hollow bodies by integration of electroforming and solid freeform fabrication
InactiveUS6409902B1Stay in shapeAvoid insufficient thicknessAdditive manufacturing apparatusFoundry mouldsElectrolysisElement analysis
This invention describes a rapid tooling process that integrates solid freeform fabrication (SFF) with electroforming to produce metal tools including molds, dies, and electrical discharge machining (EDM) electrodes. An SFF part is metalized by electroless plating and then placed in an electroplating solution, where metal is deposited upon the part by electrolysis. When the desired thickness of metal has been reached, the SFF part is removed from the metal shell. The shell is then optionally backed with other materials to form a mold cavity, and EDM electrode, or other desired parts for tooling. Thermomechanical modeling and numerical simulation with finite element analysis (FEA) is used to determine the geometry of the SFF part and the electroform thickness for minimizing the manufacturing time and cost while satisfy the tooling requirement.
Owner:NEW JERSEY INSTITUTE OF TECHNOLOGY
System and method for quantifying material properties
InactiveUS20020157478A1Simple processOptimize economyForce measurementMeasurement arrangements for variableElement analysisComputational model
A materials characterization method models dynamic, non-linear, temperature-dependent stress, strain, hysteresis, creep, and loss of elasticity at high strain, both in test samples and in Finite Element Analysis (FEA). Incorporating universal properties of statistical mechanics and adapting domain models from ferromagnetics to the higher-dimensional realm of stress tensors, the model is applicable to polymers, rubbers, liquids, and metals in elastic and plastic deformation. The model quantifies the dynamics of both plastic and brittle failure. Apparatus and methods are shown for testing material samples and matching the computational model to sample characteristics, leading to a set of characterizing parameters and predictive simulations using those parameters. Though apparatus and testing protocols of the invention yield optimum characterizations, pre-existing data from conventional testing yield useful results.
Owner:SEALE JOSEPH B
Method for controlling machining accuracy of large integrated thin-walled parts based on finite element analysis
InactiveCN104077442AReduce machining accuracyShorten the processing cycleSpecial data processing applicationsElement analysisMachining deformation
The invention discloses a method for controlling the machining accuracy of large integrated thin-walled parts based on finite element analysis. The method comprises the following steps of: 1, extracting local structural features of the large integrated thin-walled part; 2, performing finite element simulative analysis on local structural features to obtain an optimized cutting technology; 3, numerically modeling a large integrated workblank, and loading an initial internal stress; 4, protocoling a tool path, namely protocoling the machining sequence of the feature structures; 5, performing simulative analysis on the integrated structure to obtain a predicted deformation result under the condition of process technology; 6, regulating and optimizing a clamp scheme to control machining deformation. The method adopts finite element simulation, can analyze and predict in advance before the actual machining of the parts, and thereby corresponding machining strategy is adjusted, machining deformation is effectively controlled, production cycle of the parts is shortened, and production cost is reduced.
Owner:NANJING CHENGUANG GRP +1
Methods of and apparatus for forming hollow metal articles
In hydroforming of hollow metal articles in a die, such as pressure-ram-forming procedures, a method of decreasing cycle time of the forming process, while ensuring acceptable product properties and avoiding failures, by modeling the process using finite element analysis to establish a pressure-time history that optimizes the forming operation and applies failure limits to selected variables such as minimum wall thickness or maximum strain rate, and transferring this pressure-time history to a computer controlling the forming process. Thermocouple and / or continuity sensors are incorporated into the die wall and connected to the computer so as to provide active feedback from the die to the control of the process.
Owner:MONTEBELLO PACKAGING A DIVISION OF GREAT PACIFIC ENTERPRISE INC
Methods of and apparatus for forming hollow metal articles
In hydroforming of hollow metal articles in a die, such as pressure-ram-forming procedures, a method of decreasing cycle time of the forming process, while ensuring acceptable product properties and avoiding failures, by modeling the process using finite element analysis to establish a pressure-time history that optimizes the forming operation and applies failure limits to selected variables such as minimum wall thickness or maximum strain rate, and transferring this pressure-time history to a computer controlling the forming process. Thermocouple and / or continuity sensors are incorporated into the die wall and connected to the computer so as to provide active feedback from the die to the control of the process.
Owner:MONTEBELLO PACKAGING A DIVISION OF GREAT PACIFIC ENTERPRISE INC
Mesh generation system, design support system, analysis system, analysis method, mesh generation method, and storage medium and program transmission apparatus therefor
InactiveUS6947879B2Detecting faulty computer hardwareComputation using non-denominational number representationElement analysisComputer graphics (images)
It is one object of the present invention to form a conventional mesh as a sample in order to efficiently generate a high-quality mesh for a predetermined shape model.A mesh generation system 10 for generating a mesh used for finite element analysis comprises: a mesh characteristic extraction unit 11 for receiving a conventional mesh and extracting a characteristic therefrom; and a mesh generator 13 for receiving a target shape model for mesh generation, and for generating a mesh for the shape model based on the characteristic of the conventional mesh extracted by the mesh characteristic extraction unit 11.
Owner:IBM CORP
A method for predicting post-buckling of a reinforced wallboard based on finite element analysis
PendingCN109684693ASave the cost of physical testingReduce physical testingGeometric CADDesign optimisation/simulationNonlinear bucklingFinite element limit analysis
The invention relates to a method for predicting the post-buckling of a reinforced wallboard based on finite element analysis, which comprises the following steps: firstly, carrying out simulation modeling on a reinforced wallboard shear test piece, and carrying out linear buckling analysis to obtain a reinforced wallboard shear characteristic value buckling mode; Before nonlinear buckling analysis is carried out, a first-order buckling mode vector of the stiffened wallboard is normalized and multiplied by a defect base vector to obtain a defect offset vector, forced node displacement is applied through an SPCD model data card, and defects of an assessment area are introduced into a perfect stiffened wallboard structure in a form of updating unit node coordinates; The large deflection andthe plastic effect of the post-buckling of the reinforced wallboard are considered, post-buckling calculation is carried out on the structure, the bearing capacity of the reinforced wallboard is predicted through a load-displacement curve of a load application point in the process from stress deformation to post-buckling damage of the structure, and the accuracy and engineering feasibility of themethod are verified through a test result; By means of the method, physical tests are reduced, and great significance is achieved for reducing the test cost and risk.
Owner:XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
Material tensile real constitutive curve testing technology
InactiveCN103175735AOvercome the disadvantages of large number of iterations and high computational costGood effectMaterial strength using tensile/compressive forcesClassical mechanicsMetallic materials
The invention discloses a material tensile real constitutive curve testing technology for obtaining an engineering stress-engineering strain curve and a load-displacement curve. The technology comprises the following steps of: obtaining a necking distortion profile curve and a stress strain field by non-contact optical measurement, establishing a finite element analytical model of a funnel round bar sample, stimulating the whole process that the sample is stretched until the necking is broken, and demarcating the real constitutive curve in an iteration solution mode. The technology disclosed by the invention overcomes the defects that the construction defect mode cannot precisely simulate a necking phenomenon of all metal material, the iteration times in the finite element iteration computation are more, and the computation cost is high; and the technology is combined with a non-contact optical distortion measurement system to monitor the tensile so as to obtain the load-displacement curve of the full-course sample tensile and the distortion field.
Owner:SOUTHWEST JIAOTONG UNIV
Method of evolutionary optimization algorithm for structure design
InactiveUS20080183436A1Geometric CADDesign optimisation/simulationStress distributionElement analysis
The present invention discloses a method of evolutionary optimization algorithm for structure design which comprises steps of: meshing a geometric structure with applied geometric boundary conditions; analyzing the meshed geometric structure by finite element analysis to determine the relative stress distribution of the structure; and evolving the geometric structure by migrating geometric boundary nodes. During evolution, meshing and finite element analysis are repeated to perform structural optimization evolutionally till the evolving design converged to an optimum. The present invention overcomes the mesh-dependency problem in most of structural optimization algorithms in the field of structure topology optimization. In addition, the optimized design of the present invention possesses smooth geometric boundaries. Moreover, structure topology resolutions can be controlled and capable of producing designs that are very close to exact theoretical analysis.
Owner:IND TECH RES INST
Online thermal distribution image predicting method
InactiveCN103226731AEasy to installImprove real-time performanceRadiation pyrometryForecastingHeat distributionElement analysis
The invention discloses an online thermal distribution image predicting method, and belongs to the technical field of fault detection and diagnosis. The online thermal distribution image predicting method is characterized by being a method for performing thermodynamic analysis on changes in heat distribution, giving a prediction and synthesizing a vivid heat distribution image through finite element analysis measures, digital image processing, thermodynamic theories and thermal imaging simulation based on an infrared imaging technology under the condition that heat source parameters are uncertain. According to the method, the thermal dynamic features within the heat distribution image are widely applied to the infrared imaging technology; and in the field of temperature monitoring and temperature prewarning, a temperature change trend is predicted, and even through dynamic numerical features in the heat distribution image, a temperature change characteristic in a future time domain is quantitatively given, so that the temperature prewarning time is further advanced, precious time is saved for equipment repair, the production safety is further ensured, considerable economic benefits are brought to an enterprise, and a certain contribution is made to the state development.
Owner:TAIYUAN UNIV OF TECH
Finite element method and strength evaluation method for bolt
The invention relates to a finite element method and a strength evaluation method for a bolt and belongs to the technical field of bolt strength evaluation. The finite element method and the strength evaluation method for the bolt can be applied to rapid modeling and strength evaluation of a large number of bolts under the condition of complicated structures and complicated loads. The strength evaluation method comprises the steps that a bolt stress finite element analysis result is read; a cross section parallel to a nut is established in the middle of a screw, and the tension and bending moment on the cross section under different load steps are extracted; a curve chart is made with the tension of the screw as the horizontal coordinate and the bending moment of the screw as the longitudinal coordinate; the bending moment of the bolt reaches a peak value along with the increase of the tension of the bolt; the bending moment of the bolt starts to be reduced along with the continuous increase of the tension of the bolt, and it is indicated that the bolt enters the yield stage; it is indicated that the bolt reaches the ultimate strength when the bending moment of the bolt reduces to half of the peak value along with further increase of the tension of the bolt. Bolt stress is calculated with the finite element method, a bolt strength criterion is established, and the precision of bolt strength calculation is improved.
Owner:BEIJING INST OF ASTRONAUTICAL SYST ENG +1
Process for fabricating plastic optical fiber
InactiveUS6254808B1Stable changeNarrow widthOptical fibre with graded refractive index core/claddingOptical articlesFiberElement analysis
A continuous extrusion process is provided capable of producing graded index plastic optical fiber at commercially useful speeds, e.g., at least 1 m / sec for 250 mum outer diameter fiber. Moreover, it is possible to predict the refractive index profile of the fiber, prior to actual fabrication, by performing a finite element analysis using various parameters of the extrusion process. Such prediction allows one to tune the parameters of the process to obtain a desirable outcome, while avoiding the need for substantial trial and error with the extrusion equipment.
Owner:FITEL USA CORP
System and method for controlling membrane-base reflecting mirror surface shape
InactiveCN101738949AEasy to set upQuick buildProgramme control in sequence/logic controllersElement analysisActuator
The invention discloses a system and a method for controlling the membrane-base reflecting mirror surface shape. The system comprises a standard reflecting mirror surface shape designing module, an emulational analyzing module, a reflecting mirror surface shape monitoring module, a fuzzy logic controlling module, a reflecting mirror surface shape controlling actuator and a reflecting mirror surface shape feeding back module. The aperture and the F number of a membrane-base reflecting mirror needed for design are used as the parameters and the Zernike polynomial coefficient form is adopted to determine the standard reflecting mirror surface shape parameter; the real-time membrane-base reflecting mirror surface shape is detected; the errors of the arc rises for the central cross sections of both a membrane-base reflecting mirror and a standard reflecting mirror are used as control variables, and the control variables are processed by a fuzzy logic controller; the voltage needed for forming the membrane-base reflecting mirror is outputted; and the membrane-base reflecting mirror surface shape is changed with the electrostatic method. The invention adopts the emulational reflecting mirror surface shape control analysis based on the finite-element analysis method to predict the reflecting mirror surface shape control effect, optimize the fuzzy control rule base and reduce the difficulty of designing the fuzzy logic controller. The method provides the technological base for the effective membrane-base reflecting mirror surface shape.
Owner:SUZHOU UNIV
Proton exchange membrane fuel cell flooding fault diagnosis method based on multiple physical fields
ActiveCN111199122AImprove accuracyImprove reliabilityFuel cell controlDesign optimisation/simulationElectrical batteryElement analysis
The invention discloses a proton exchange membrane fuel cell flooding fault diagnosis method based on multiple physical fields. The method comprises the following steps: establishing a three-dimensional geometric model of a proton exchange membrane fuel cell; establishing a control equation, and setting physical fields for different areas of the geometric model to obtain a fault diagnosis model; performing mesh generation on the fault diagnosis model based on a finite element analysis method; and obtaining a cathode pressure drop curve and a battery polarization curve according to the fault diagnosis model after mesh generation, determining a fault state according to the battery polarization curve, and determining that a flooding fault occurs according to increase of the cathode pressure drop change rate. According to the invention, internal component distribution is observed through multi-physical field simulation PEMFC, and the method is provided according to the relationship between battery performance reduction and internal mass transfer and the relationship between inlet and outlet pressure drop and battery current density, so that the accuracy and reliability of flooding fault diagnosis can be improved.
Owner:SOUTHWEST JIAOTONG UNIV
Finite element model correction method of composite material structure based on clustering analysis
ActiveCN107357992AReduce in quantityImprove stabilityGeometric CADDesign optimisation/simulationElement modelAlgorithm
The invention provides a finite element model correction method of a composite material structure based on clustering analysis. An initial finite element analysis model is established, an experiment modal frequency and a modal oscillation shape of the structure are measured, a relative sensitivity matrix of parameters to be corrected is calculated, a layering clustering algorithm is utilized to conduct parameter grouping on the parameters to be corrected, relative sensitivity analysis is further conducted on clustering parameters, the clustering parameter with the largest relative sensitivity average value in all the parameters is selected to be corrected, a modal frequency of an analysis model and a residual vector of an actually measured modal frequency are constructed, a target function needed for analysis model correction is established, and an optimizing inverse problem of the target function is constructed to correct the finite element model of the composite material structure. Through the combination of numerical simulation, texts and an optimizing technology, a relative sensitivity matrix of the parameters is adopted to conduct the clustering analysis, the quantity of the parameters to be corrected is reduced, the correction program stability is improved, an accurate and equivalent finite element model parameter correction method of a composite material based on the combination of the numerical simulation, the experiments and optimization is provided for engineering application.
Owner:SOUTHEAST UNIV
Improved topology optimization for designing engineering product
InactiveCN101859332AGeometric CADDesign optimisation/simulationElement analysisTopological optimization
Owner:LIVERMORE SOFTWARE TECH
Composite internal fixators
ActiveUS9492210B2Internal osteosythesisDiagnostic markersOrthopedic fixation devicesElement analysis
Owner:SMITH & NEPHEW INC
Method for predicting electrical properties of deformed log-periodic antennae based on electromechanical coupling model
InactiveCN102253290AAccurate analysisRealize the structureElectrical testingAntenna designElement model
The invention discloses a method for predicting electrical properties of deformed log-periodic antennae based on an electromechanical coupling model, aiming to mainly solve the problem of electromechanical separation in the log-periodic antennae. The method comprises the following steps: building a finite element model based on the structural design parameters of the log-periodic antennae, loading dead load, random wind and other environmental loads and carrying out finite element analysis to obtain the structure displacement field of the log-periodic antennae; utilizing the analysis results to obtain current distribution of oscillator units in the log-periodic antennae and phase difference caused by the positions and deflection of the oscillator units and computing the far field patternsof the log-periodic antennae according to the superposition theorem; and obtaining the electrical property parameters of the log-periodic antennae to realize electromechanical coupling analysis of the log-periodic antennae. The method can help the log-periodic antenna structural design personnel improve the antenna design and manufacturing quality.
Owner:็ไปๆ
Safety assessment method for pressure-bearing structure with creep damages and volume defects
ActiveCN103995957ASimple formulaEasy to calculateSpecial data processing applicationsInternal pressureFinite element method
Owner:EAST CHINA UNIV OF SCI & TECH
Assessment method and system for building damage after fire
InactiveCN103063808AEasy to analyze and calculateImprove accuracyMaterial analysisAssessment methodsElement analysis
The invention provides an assessment method for building damage after fire, and the assessment method for the building damage after the fire includes the following steps: 1. collecting data of a scene of the fire, 2. modeling the scene of the fire according to the data of the scene of the fire and carrying out fire simulation in the scene of the fire for achieving fire simulation results, 3. analyzing the fire simulation results, 4. establishing a finite element model, and adding second data to the finite element model for finite element analysis so as to obtain finite element analysis results, 5. carrying out safety assessment for the finite element results. Provided is a corresponding system. The assessment method for the building damage after the fire can be widely used for the fire reappearance and the practice of the safety design of the building structure after the fire, not only can improve the accuracy and reliability of the reappearance of the building fire, but also can greatly save time and cost for the reappearance of the building fire and the safety design of the structure. Therefore, the assessment method for the building damage after the fire has an important theoretical guiding significance and a practical value.
Owner:SHANGHAI JIAO TONG UNIV
Axial layered cutting method for turning coarse-pitch threads, tool wear testing method and force-heat load calculating method of tool wear
InactiveCN105643024ADimensional accuracy does not existGuaranteed dimensional accuracyAutomatic control devicesThread cutting machinesWear patternHeat load
The invention discloses an axial layered cutting method for turning coarse-pitch threads, a tool wear testing method and a force-heat load calculating method of tool wear for eliminating principle errors caused by radial layered cutting of the coarse-pitch threads. The axial layered cutting method for turning the coarse-pitch threads, the tool wear testing method and the force-heat load calculating method of tool wear are technically characterized in that through the cutting method, a testing tool with a left cutting edge and a right cutting edge is used for axially turning a left thread surface and a right thread surface of a coarse-pitch test piece in a layered mode, wear tests of the tool turning the coarse-pitch threads are conducted through the cutting method, the wear pattern of the tool turning the coarse-pitch threads is obtained, the influence of tool wear on thread machining surfaces is revealed, then a finite element analytical model of the tool is reconstructed according to the flank wear data of the tool and the blunt round radius measurement data of the cutting edges, analysis and calculation of the temperature field and the stress field of the tool are carried out, and the force-heat load change characteristic on the tool wear condition is obtained.
Owner:HARBIN UNIV OF SCI & TECH
Method for improving finite element analysis accuracy of transmission case
ActiveCN104484526AThe force is close to the realImprove analysis accuracySpecial data processing applicationsElement modelGear wheel
The invention relates to a method for improving finite element analysis accuracy of a transmission case. The method comprises the steps of establishing a finite element model of an assembly consisting of major parts such as a clutch case, the transmission case, an upper cover and gears, applying gear engagement force to gear engagement nodes, fixing bolt holes of the clutch case connected with a flywheel case, applying rotation freedom degree constraints of gear shafts between all gears and corresponding supporting bearings on two sides and fully cutting off paths of transmission of torque from gear shafts to case bearing holes. The method for improving finite element analysis accuracy of the transmission case has the advantages that since the rotation freedom degree constraints of gear shafts are applied between all gears and corresponding supporting bearings on two sides, relative rotation or relative rotation trend between bearings and bearing holes is prevented, the problem that the stress of the bearing holes in the case is relatively large is solved, the finite element simulation of the transmission case is more compliant with the actual situation, the finite element analysis accuracy of the case is effectively improved, and further the goals of improving the product design accuracy, reducing the product test frequency and decreasing the product development cost are achieved.
Owner:CHINA FIRST AUTOMOBILE
Asphalt mixture viscoelastic property test method based on wheel load instrument
InactiveCN102628780AImprove stressThe test process is convenientMaterial strength using tensile/compressive forcesMaterial strength using repeated/pulsating forcesStress distributionElement analysis
The invention relates to an asphalt mixture viscoelastic property test method based on a wheel load instrument. In the method, the wheel load instrument, a test piece, a dynamic modulus test and a creep test are provided. The method comprises the following steps: a, before the test, assembling a strain sensor at the bottom of an asphalt mixture test piece and calculating by a mechanical method or a finite element analysis method to obtain the stress distribution condition of the test piece under the action of moveable load according to moving wheel load features and the test piece size; b, during the test, employing the modulus test and the creep test: measuring the tensile deformation strain capacity of the test piece by using the strain sensor, and measuring the tensile deformation strain capacity of the test piece through the strain sensor; and c, after the test, obtaining the stress and the strain capacity of the test piece and the action time of the wheel load by the wheel load instrument and the strain sensor. The method has the characteristics of simplicity, practicability, high operability and high applicability. According to the method, the stress characteristic of the test piece during the test is similar to the actual asphalt concrete road surface, and the viscoelastic property obtained by the test is accurate and reliable.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
Asphalt mixture fatigue property test method based on wheel load instrument
InactiveCN102636400AFatigue Accurate and ReliableEasy to operateMaterial strength using repeated/pulsating forcesStress distributionElement analysis
The invention provides an asphalt mixture fatigue property test method based on a wheel load instrument, and the method comprises a wheel load instrument and a test piece. The method comprises the following steps of: a. before the test, installing a strain sensor at the bottom of the asphalt mixture test piece, and obtaining a stress distribution situation of the test piece in the effect of a moving load through a mechanical method or finite element analysis calculation according to the characteristics of the moving wheel load and the size of the test piece; b. during the test, firstly preloading the test piece, obtaining the size of the moving wheel load to be applied according to the strain value generated by the test piece, applying a periodical fixed moving wheel load to the test piece through the wheel load instrument, and measuring the strain capacity of the tensile deformation generated by the test piece by the strain sensor; c. after the test, obtaining the stress and the strain capacity of the test piece and the applying time of the periodical moving wheel load through the wheel load instrument and the strain sensor. The method provided by the invention is simple and practicable and is convenient to popularize; and the asphalt mixture test piece in the test is in a stress state the same as that of an actual asphalt concrete road surface.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
Bidirectional evolutionary structure topological optimization based disk type flywheel optimized design method
The invention discloses a bidirectional evolutionary structure topological optimization based disk type flywheel optimized design method. The disk type flywheel is made of a homogeneous material. The design method comprises the following steps: performing finite element grid division on an initial design domain of the disk type flywheel and giving a target volume, a volume evolution rate and a filtering radius of a structure; performing finite element analysis on the flywheel structure and calculating a stress sensitivity number of each unit; obtaining the sensitivity number of the current iteration and the structure target volume of the next iteration; and deleting and adding units until the target volume and the condition of convergence are satisfied at the same time. Through the bidirectional evolutionary structure topological optimization based disk type flywheel optimized design method, disclosed by the invention, practical flywheel optimized design can be guided rationally, and therefore, mass of the flywheel can be reduced on the basis of a certain intensity.
Owner:HUNAN UNIV
Trunk line electrification contact system in strong wind environment and parameter determination method thereof
ActiveCN102756671BImprove structural strengthIncrease stiffnessPower supply linesSpecial data processing applicationsFinite elemente analyseMechanics
The invention relates to a railway electrification catenary in a strong wind environment and a parameter determination method thereof. The strong wind in the wind area and tuyere will cause greater and more complex vibration and wind deflection of the catenary, which will affect the dynamic quality of pantograph-catenary operation and threaten the safety of pantograph-catenary contact and catenary structure. The invention comprehensively adopts CFD numerical simulation calculation, catenary wind-induced response finite element analysis, pantograph-catenary simulation, wind tunnel test and field engineering test, and proposes structural strength, stiffness, reliability, wind resistance stability and pantograph-catenary dynamic flow performance A well-integrated catenary, that is, adopt a structure height of 1100mm, a span of no more than 50m, a proper match between the tension of the catenary cable and the tension of the contact line, the overall steel arm structure, the conversion column and the turnout column as double arm columns, the contact line and the contact line A simple chain suspension system anchored by catenary cables. The invention proposes a catenary adaptable to strong wind conditions, which ensures the safety and reliability of the catenary structure under the action of long-term strong winds.
Owner:CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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