1119 results about "Finite element software" patented technology

A system for planning a spine surgery, comprising a haptic interface capable of providing force feedback to the user and a computer adapted to simulate a surgical procedure by responding to inputs from the haptic interface and outputting haptic feedback to the haptic interface is provided.

The system further comprising a rapid prototyping unit including a unit that is adapted to create models of the anatomical region where the surgical procedure will be performed in its current unoperated condition and in the predicted postoperative condition. Further the rapid prototyping unit is adapted to create a three dimensional guide to be used in the surgical procedure as well as suggest revisions to the surgical procedure. The system further comprises a computer that simulates loading of the spine and planned implanted hardware using finite element software.

The invention discloses a high-temperature creep deformation prediction and creep damage analysis method for a high-chrome steel component. The method comprises the following steps of: establishing a theoretical model, determining material parameters, designing a numerical integration algorithm, carrying out the secondary development of finite element software, carrying out the creep damage analysis of the component and the like. Compared with an existing technical scheme, the method disclosed by the invention is characterized in that a great improvement is carried out, the accurate prediction of the creep behavior and the creep damage of the high-chrome steel component can be realized, and therefore, the method has an important application value in the fields of the security design and the residual life evaluation of high-temperature high-pressure components in a supercritical generator set.

The invention discloses a high-gain horn antenna based on an inhomogeneous medium, which is made by the following steps of: (1) determining a central frequency f for the operation of the antenna; (2) designing the ordinary horn antenna operated in the central frequency according to a general designing method for the horn antenna, wherein the aperture of an H side of the antenna is a, the aperture of an E side is b, and the length of a horn is h; (3) determining a refractive index profile n (x, y) of the inhomogeneous medium placed on a mouth surface of the horn; and (4) building the inhomogeneous medium with refractive indexes distributed according to the n (x, y) by using a reverse H-shaped sub-wavelength artificial structural material, and evaluating the structural size of a reverse H-shaped sub-wavelength artificial structural material unit corresponding to each refractive index in a mode of emulation by finite element software.

The invention discloses a multi-objective optimization design method for a wheel, relates to the technical field of vehicle engineering and aims at solving the problems that the optimization space is limited and automatic optimization design is not carried out through joint transferring of calculation software with various properties due to the fact that only limited performance of the vehicle is analyzed and optimized and parametric modeling is lost at present. The method comprises the steps of topological optimization of a wheel fatigue test, combined topological optimization modeling, fatigue performance analysis, impact performance analysis, aerodynamic performance analysis and multi-objective optimization. Five working conditions of a dynamic bending fatigue test of the wheel, a dynamic radial fatigue test, an impact test of an impact hammer opposite to a spoke, an impact test of the impact hammer opposite to a window and air dynamics analysis of the wheel are set; the properties, such as the strength, the rigidity, the vibration characteristic, the fatigue life, the fatigue life security coefficient, the impact performance, the air dynamic property and the lightweight performance of the wheel are comprehensively considered; various performance parameters are calculated through finite element software emulation; and optimization design is carried out on the wheel by setting the performance parameters to be constraint conditions or objective functions.

A tomography reconstruction method of fluorescence molecules based on a linearity relation belongs to the technical field of the image reconstruction in biomedicine. The reconstruction method is characterized in that the method sequentially comprises the following steps: 1. the outside surface outline is obtained by picture processing and numerical fitting based on the map data of a mouse used in experiment; 2. the outside surface outline is led into a finite element software package for meshing; 3. every excitation light source, and finite element grid nodes which are corresponding to corresponding fluorescence monitoring points are found; 4. aiming at one given excitation light source sk, a linear relation matrix Wsk between fluorescence intensity which is detected from surface and unknown fluorescent probe distribution is established; 5. aiming at all excitation light sources, a general linear relation matrix is generated; 6. after the linear relation is obtained, a algebra reconstruction method is used for iterating the fluorescent probe distribution which approaches the reality. The method is characterized in that non-uniform optical parameters can be handled and the precise linear relation between the fluorescence intensity which is detected from surface and the unknown fluorescent probe distribution is rapidly established.

The invention discloses a finite element modeling method used for damage processes of the thermal barrier coating of a turbine blade, belonging to the field of heat-insulation protection coating system technology of high-performance aero-engine. The method adopts a CATIA software and a finite element ABAQUS software. The method wholly models all coatings and the substrate in the CATIA software, carries out a secondary processing to geometrical models in the ABAQUS software, carries out geometrical cleaning to the model in the CATIA software, and carries out simulation, calculation and result analysis in the ABAQUS software. The method can effectively overcome the incompatibility of the CAD software such as CATIA and the like and the finite element software, considers both various properties of the heat barrier coating material and the geometrical shape of the substrate, can exactly simulate the relevant key physical quantity of the turbine blade heat barrier coating system in practical working environment, has clear concept and is convenient to be mastered and used by the technicians.

The invention discloses a transient temperature field simulation method based on multiple commutation failures of a smoothing reactor. The method comprises the following steps that A, an oil immersed type smoothing reactor three-dimensional geometrical model is built in a solid modeling mode on the basis of ANSYS finite element software; B, an oil immersed type smoothing reactor is subjected to heat generating analysis; C, the oil immersed type smoothing reactor is subjected to heat radiation analysis; D, the boundary conditions of temperature field simulation calculation are determined; E, the steady temperature field of the smoothing reactor under the normal work condition is calculated; F, the obtained steady temperature field result is used as an initial value of a failure transient model, then, the failure current is loaded, a step-length method is adopted, the distribution of the temperature field along with time after the failure is calculated, and the transient temperature field simulation method based on multiple commutation failures of the smoothing reactor is completed. The method has the advantage that basis is provided for checking the maloperation reason of a smoothing reactor gas relay and setting the gas checking setting valve of the smoothing reactor.

The invention discloses a robot joint vibration analyzing and inhibiting method based on a flexible dynamical model. The method comprises the following steps: (1) establishing the flexible dynamical model of a robot joint and analyzing the reason that the robot joint vibrates; (2) acquiring vibrating model information of the joint by means of ABAQUS finite element software, acquiring monitoring point arrangement of a force hammer excitation experimental method based on the vibrating model information of ABAQUS, acquiring modal information of the robot joint and further analyzing the control influence of resonant frequency on the robot; (3) adopting a double T-shaped trapped wave filter with an adjustable trapped wave depth and a width parameter; (4) solving the optimum trapped wave depth of the double T-shaped trapped wave filter by simulation; and (5) setting proper parameters on an alternating current servo system of the robot joint, and starting the rapped wave function of the double T-shaped trapped wave filter so as to inhibit the vibration of the robot joint. The invention provides the robot joint vibration analyzing and inhibiting method based on the flexible dynamical modelfor solving the problem of mechanical resonance often caused by a flexible transmission link in a transmission system of an industrial robot.

The invention discloses a triaxial test three-dimensional deformation reconstruction and measurement method and belongs to the technical field of geotechnical experiment testing. The method is characterized in that a transparent square pressure chamber is adopted, a specially-produced rubber membrane whose label can be tracked is marked, two digital cameras at the front and at the back and a corresponding image acquisition control and processing system are employed, through tracking the position change of the angle points of the rubber membrane on an image, a certain hypothesis is adopted to obtain the space coordinate of the characteristic points of the rubber membrane on the surface of a sample, and the images acquired by the two cameras at the front and at the back are spliced so that the measurement of the three-dimensional deformation of the sample during a triaxial test process is realized. Through combination with ANSYS finite element software, a three-dimensional deformation grid and a three-dimensional whole surface strain field of the sample are obtained. The method provided by the invention has the following advantages: the comprehensive deformation characteristics of the sample in the triaxial test process can be obtained from a front direction and a back direction, and the space positions of surface characteristic points in a triaxial test can be obtained for realizing reconstruction of three-dimensional deformation of the sample, and the distribution of the three-dimensional surface strain field of the sample can be obtained.

The invention provides a structure safety evaluation method under the action of environmental loads of a space steel structure. The structure safety evaluation method under the action of the environmental loads of the space steel structure comprises the steps that S1, environmental load partitioning is conducted on the structure on the basis of existing monitoring data; S2, a method for determining values of non-uniform distributed loads on structure partitions is determined; S3, a structural stress monitoring data evaluation threshold is set; S4, simulation analysis of structural stress field distribution under the action of the actual environmental loads is conducted through operation of finite element software and combination between the existing structure partitions and partition load values; S5, stress response data of the structure are extracted to be evaluated. According to the structure safety evaluation method under the action of the environmental loads of the space steel structure, good simulation of non-uniform distribution of actual temperature loads and actual wind loads of the space steel structure is achieved through utilization of existing temperature measured data and wind speed and pressure monitoring data of a health monitoring system, and therefore identification of a whole stress field under the action of the environmental loads of the structure is achieved; meanwhile, due to the fact that stress of rod pieces at measuring points and rod pieces which are not arranged at the measuring points is evaluated, the problems which can be caused in the process that whole stress safety of the structure is evaluated only through the finite stress measuring points are solved.

A structure finite element model correcting method based on multi-element uncertainty comprises the following steps: (1) building an initialized parameterization equivalent finite element model in finite element software; (2) screening out significance parameters; (3) obtaining sample points, and constructing an incomplete variable high-order response surface model; (4) judging validity of the response surface model, if the validity of the response surface model meets the requirement, executing the next step, and if the validity of the response surface model does not meet the requirement, executing the step (3) again; (5) building a rapid random sampling analysis model with the combination of a high-order response surface and the Monte Carlo method, and conducting statistics on a mean value and a covariance matrix of simulation output responses; (6) conducting statistics on a mean value and a covariance matrix of test output results; (7) constructing a weighting objective function of the mean values and covariances of tests and simulation; (8) reversely estimating a mean value and a covariance matrix of input parameters; (9) judging whether the mean value and the covariance matrix of the input parameters meet correction accuracy or not, if yes, stopping iteration, and if not, executing the step (8) again. According to the structure finite element model correcting method, the calculated amount of the iteration is reduced, the application range is wide, and optimization of a large-scale parameter range is achieved.

The invention provides a test and analysis method for overall fire resistance of a high-rise steel frame structure. The method includes: establishing a temperature field finite element model and a mechanical field finite element model for a high-rise steel frame structure system; designing corresponding fire condition parameters according to standard fire conditions, establishing a fire dynamics model by a spatial air temperature rise model or by a fluid dynamics calculation procedure FDS to calculate spatial temperature fields under various fire conditions, and using an obtained time-varying spatial temperature field as a thermal boundary condition for the temperature field finite element model of the whole structure; calculating the finite element model by finite element software; calculating the temperature field finite element model by software, substituting the obtained finite element temperature field to the mechanical field finite element model, and calculating to obtain a mechanical field; estimating whether the structure system collapses or not or exceeds the design limits or not according to calculation results; performing quantitative analysis on fire loss economy, and judging the economy of a fire protection design scheme.

The invention discloses a bidirectional fluid-solid-heat coupling calculating method of a water-lubricated rubber bearing, comprising the following steps of setting basic assumption of a solution process according to the special structure and practical operating condition of the water-lubricated rubber bearing and combined with heat transfer characteristics of the water-lubricated rubber bearing; determining fluid, solid and temperature field coupling boundary conditions of the water-lubricated rubber bearing; building fluid domain and solid domain solution models, including mathematical models and mechanical models, of the water-lubricated rubber bearing,; meshing the fluid domain and solid domain of the water-lubricated rubber bearing by means of a finite element software platform and professional meshing software; building differential control equations of the fluid domain, solid domain and heat transfer characteristics of the water-lubricated rubber bearing; and building a fluid-solid-heat coupling model of the water-lubricated rubber bearing, solving the fluid-solid-heat coupling model by using a numerical method, and obtaining deformation conditions of the fluid domain, solid domain and temperature field. The method is effectively suitable for three-field coupling solution of the water-lubricated rubber bearing, solution precision is high, and the number of iterations is low.

The invention, for reducing a stress shielding effect after prosthesis implantation, proposes a host bone stress environment based custom prosthesis optimization design method. Three criteria, namely, the strength, the surrounding bone stress and the interface micro-motion between a prosthesis and a bone, in prosthesis elastic modulus optimization calculation are proposed, and the mechanical property of the host bone and a personalized kinematic input are considered in optimization; the prosthesis elastic modulus distribution is optimized through finite element software to achieve the purpose of optimizing a porous structure in the prosthesis; and for the designed prosthesis, on the premise of meeting the strength requirement, the stress shielding effect after implantation is reduced and the service life of the prosthesis after implantation is prolonged.

The invention relates to a method for checking strength performances of a variable-pitch bearing and hub connecting bolt and a variable-pitch bearing and vane connecting bolt of a fan. By utilizing three-dimensional cartographic software, three-dimensional geometrical models of devices in a load transmission path of the variable-pitch bearing and hub connecting bolt and the variable-pitch bearing and vane connecting bolt of the fan are subjected to grid division and assembly separately, and a finite element model is established through finite element software to realize that the load transmission path is complete and consistent with the reality. The devices in the load transmission path at least include a hub, a vane root part, a vane flange, a variable-pitch bearing inner ring, a variable-pitch bearing outer ring, the variable-pitch bearing and hub connecting bolt and the variable-pitch bearing and vane connecting bolt. The method realizes the complete load transmission path, is capable of accurately calculating the limit strength and fatigue strength of the variable-pitch bearing and hub connecting bolt and the variable-pitch bearing and vane connecting bolt of the fan, and improves the operational reliability of a wind power unit.

The invention discloses a structural dynamical model modification-based prestress recognition method, and relates to the prestress recognition of pre-tensioning structures. The method comprises the following steps: establishing a finite element model of a structure; converting the boundary condition such as clamped support or simple support into spring support in three or two directions, and applying an axial prestress at the same time; calculating a fixed frequency and a fixed vibration mode of the structure through commercial finite element software; carrying out test and recognition by utilizing a test modal analysis technology, so as to obtain the fixed frequency and the fixed vibration mode of the structure; and recognizing the spring support rigidity and prestress of the boundary at the same time on the basis of a model modification technology. The method is simple, high in recognition precision and convenient to operate; and through considering the influences of the boundary condition, the reliability is high. By taking MAC as a target function, the completeness of the test data is supplemented; the optimization through a genetic algorithm is more beneficial for obtaining the globally optimal solution; and the whole modification model can be automatically driven to carry out solving.

The invention discloses numerical simulation technology for a hollow section porthole die extrusion welding process, which belongs to the technical field of metal extrusion. The technology comprises the steps of: adopting finite element software Deform-3D to simulate a porthole die extrusion process; adopting a finite element fractional step method for calculation; transforming a three-dimensional solid model of finite element meshes into a three-dimensional surface model taking small triangular patches as basic description units, namely an STL (Stereolithography) model in the finite element software Deform-3D when the volume of penetration areas of mesh units of a welding surface is equal to that of unfilled areas of the welding surface; repairing triangular patch meshes, which are penetrated with each other, of the welding surface in the STL model to ensure that original penetration areas and the unfilled areas reform the three-dimensional surface model consisting of triangular patch units; adopting a 3X fraction method to import the repaired STL model into the finite element software Deform-3D; and adding nodal data of original units into the model to generate a new data file, and finishing simulation analysis of a porthole die extrusion welding stage and the overall process of the extrusion.

The invention relates to a building method for a welding heat source model, in particular to a building method for a laser welding heat source model. The method solves the problem in laser welding simulation of large-scale complex construction members that laser heat source achieving difficulty is large, and calculating efficiency is low. The method includes: step 1, building a three-dimensional finite element grid model; step 2, building a Gaussian heat source mode of a heat source surface; step 3, expanding welding energy along the laser welding pool depth direction; and step 4, solving a governing equation based on finite element software and conducting heat-machine coupling calculation, namely building of the laser welding heat source model is finished. The building method is applied to the field of welding.

The invention discloses a cutting parameter segmentation and variable cutting depth optimizing method based on dynamic machining feature. Firstly, a workpiece model is analyzed by finite element software, thus obtaining the initial frequency response function of the workpiece; the middle machining state of the workpiece is obtained basing on the process information of the workpiece; then the real time frequency response function of the workpiece is predicted basing on the modified modification matrix of the workpiece structure and the obtained initial frequency response function of the workpiece, the cutter point frequency response function of a cutter is obtained through a test; the frequency response function of the middle machining state is calculated; further a stable lobe graph is built; a cutting depth range and a rotating speed range are selected in the lobe graph; other constraint conditions are taken into consideration at the same time; an optimization model is built basing on the genetic algorithm; and then the feeding speed at a corner is optimized according to the moving feature of a machine tool. According to the invention, the cutting parameters are optimized basing on the dynamic machining feature; the machining quality is ensured; the machining efficiency is improved; the dynamic feature of the machine tool is taken into consideration in the segmentation optimization process, therefore the moving stability of the machine tool is ensured.