720 results about "Element modeling" patented technology

A finite element model of an ear stored on a computer readable medium having logic representing a three-dimensional geometric model of the ear; logic for meshing individual anatomical structures of the ear accounting for whether the anatomical structures include at least one of air, liquid material and solid material; logic for assigning material properties for each anatomical structure based on at least one physical property of each anatomical structure; logic for assigning boundary conditions for some of the anatomical structures indicative of interaction between such anatomical structures; and logic for employing acoustic-structural coupled analysis to the anatomical structures of the ear to generate data indicative of the acoustic effect on mechanical vibration transmission in the ear. Various embodiments of “one-chamber” and “two-chamber” analyses and models are described.

A lightweight forward design method and system of automobile structure based on multi-performance constraints is disclosed. The finite element analysis model of automobile body structure is established by using finite element modeling technology. The typical force transfer path of automobile structure is identified by using topology optimization technology and the bending / torsional rigidity performance of automobile body is taken as constrained working condition, and lightweight design in conceptual stage is carried out. Then the strain energy analysis and the material thickness sensitivity analysis are carried out by using the sensitivity analysis technology, and the weak links and the critical design area of the vehicle body are found. Topography optimization is used to improve vehicle performance; Finally, based on business integration optimization software, The multi-performance target of automobile body is analyzed by integrated simulation, and the correlation between design parameters and performance, performance and performance is studied by using DOE sampling and data mining technology, and then the lightweight design of automobile body structure considering multi-disciplinary performance is carried out, which reduces the quality of automobile body structure, improves product performance, shortens R D and manufacturing cycle, and saves cost.

The invention relates to a method for designing the automobile body acoustic vibration unevenness NVH based on a low frequency automobile acoustic sensitivity. The method comprises the following steps: firstly, establishing a body-in-white finite element modeling, and establishing an acoustic finite element modeling for a cab on the basis of the body finite element modeling; secondly, carrying the frequency response analysis on the positions of a suspending point of an engine on the automobile body, a suspension mounting point, an exhaust hanging point, and the like; thirdly, taking the vibration speed of a body wall plate obtained by the frequency response analysis as a boundary condition, and the sound pressure level beside ears of a driver by solving the acoustic response of the cab; further, the influence level of larger sheet metal parts and mounting points which have great influence on the sound pressure level are acquired by checking the vibration situation of the body wall plate displayed by the frequency response analysis result at higher sound pressure response frequency points, and analyzing the sheet metal contribution; and finally, amending the design proposal of the sheet metal parts and the design proposal of the local rigidity of the mounting points.

A system and method for specificity-based multimodality three-dimensional optical tomography imaging comprises steps of: optical imaging to obtain a light intensity of body surface optical signal of an imaging target; CT imaging to obtain structure volume data; establishing an equation representing a linear relationship between the distribution of the obtained light intensity of body surface optical signal of the imaging target, the obtained CT discrete mesh data and the distribution of unknown internal self-luminescence light sources; establishing a dynamic sparse regularization target function in every iteration for the equation; and reconstructing a tomography image. The present invention well considers the optical specificity of tissue, in which there is a non-uniform optical characteristic parameter distribution within the same tissue when finite element modeling is used, which is closer to the real situation, so that an accurate imaging effect is achieved.

One embodiment of the invention provides a computer-implemented method for discrete element modelling of a plurality of discrete elements corresponding to particles and physical geometry elements. The modelling performs a simulation through time of physical interactions of the particles with each other and with the physical geometry elements in a three-dimensional space. The method comprises providing a virtual geometry object comprising a user-defined shape. The virtual geometry object does not undergo physical interaction with the particles or physical geometry elements during the simulation. The method further comprises receiving user-defined parameters for determining the position, orientation and any movement of the virtual geometry object with respect to the three-dimensional space. The method further comprises locating the virtual geometry object in the three-dimensional space during the simulation in accordance with the user-defined parameters and identifying the particles, physical geometry elements and / or physical interactions having a particular relationship with respect to the virtual geometry object. The identified elements can then be analysed by the user, for example to determine the number of particles located at a given time within a specific region of the simulation space (as defined by the virtual geometry object).

The invention discloses a parametric modeling method of face gear teeth, comprising the following steps: first, calculating tooth surface numerical value of a face gear; then processing tooth surface discrete points coordinate data to directly read in the data to ANSYS environment; and parametrically establishing a gear tooth finite element model after parametrically establishing a gear tooth physical model, thereby obtaining a parametric finite element model. By mixed programming of Matlab and APDL (parametric design language), the method combines functions of face gear teeth width design, tooth surface stimulation, physical modeling, finite element modeling and the like, and realizes parameterization and intellectualization of face gear teeth design and modeling, high quality of finite element model, reduction of workload of designers and improvement of work efficiency.

The invention discloses a thermal simulation analysis method of a lithium ion battery of a multi-layer flaky structure. The method includes the steps of (1) preparing a battery sample and measuring electrical property data at different environment temperatures, (2) building a finite element battery solid model of a multi-layer structure and carrying out mesh dividing, (3) carrying out material property endowment and adding boundary conditions and initializing conditions of the finite element battery model, and (4) putting a battery in a heat-insulated environment and carrying out a heating experiment and a discharging experiment to achieve key parameter revision and calculation result verification of a thermal simulation analysis model. According to the thermal simulation analysis method of the lithium ion battery of the multi-layer flaky structure, experimenting and finite element modeling are organically combined, by means of a parametric model mode, every diaphragm, positive and negative pole active substance layers and a metal foil layer of the finite element model are all available, experiment results can be used for revising calculation results, and accordingly calculation precision is further guaranteed.

Methods and apparatus for structural health monitoring are described. In one example, a method for use in designing a structural health monitoring (SHM) system for use in monitoring a host structure is described. The method includes one or more of a process for designing SHM systems for any given piece of structural hardware, a process for evaluating a given SHM system, a method to quantify the performance of a given SHM system in comparison to current inspection processes, a finite element modeling approach to determining excitation frequencies to detect damage and for selecting the best time window to use for sensed excitation signals, a Bayesian Network based data fusion technique that fuses in environmental information (load cycles induced on the structure) with a damage index (DI) to produce crack detection and estimation of crack length, and a damage location and sensor selection technique.

The invention relates to a multi-scale analyzing method for buffeting response of a large-span bridge, which is a method for analyzing and calculating a fine buffeting response of a main girder and solving the difficult problem in bridge buffeting analysis. Comparison between actually measured data of a structure health monitoring system and a calculating result of the buffeting response is realized on a stress level. Based on the traditional buffeting analyzing technique for a large-span bridge structure, a multi-scale finite element modeling technique is introduced into the structure so as to obtain the fine buffeting response of key parts of the structure and then the feasibility and the effectiveness of the analyzing technique for the fine buffeting response are improved. Compared with the traditional method for obtaining the fine buffeting response, the multi-scale analyzing method for the buffeting response of the large-span bridge has the advantages of obviously improving the analyzing efficiency and the accuracy of an analyzing result with the introduction of a multi-scale technique, saving the cost and being convenient for popularization and application in broad engineering personnel. As health monitoring of large-sized bridge structures has become a development trend, the technique can inevitably generate great economic and social benefits.

The invention discloses a three-dimension crack expanded simulate method, based on embedded finite element modeling, which shows the non-continuity of structure based on structure solid model, while the crack expansion is realized by changing crack shape and position of solid continuously. The invention first builds a n embedded crack sub model of upper and lower crack surfaces, divides the whole crack structure into a non-crack body and a crack body, wherein, the crack body is composed of upper and lower six solid sub blocks, the crack surface is between the upper and lower faces of four sub blocks as the third, fourth, fifth and sixth, that the crack surface is contained in the crack body and the crack body is embedded in the non-crack body. The invention can avoid digit error in the crack expansion process, caused by unreasonably divided unit, to support the description of cut or hole-crack in projection.

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.

Disclosed are systems, devices and methods for performing simulations using a multi-component Finite Element Model (FEM) of ocular structures involved in ocular accommodation.

A spatial curved surface steel structure pipe truss roof installation construction method relates to the technical field of a building construction method. The construction method comprises the following steps of elevating a scheme, making preparation for the construction, measuring and setting out, tidying a pre-buried iron member, setting up an all-around scaffold, checking and accepting a main and secondary trusses, installing the main and secondary trusses, installation ridges and stress sheets, detaching the whole, checking and accepting after main body installation, installing a roof panel plate and checking and accepting the whole. Finite element modeling for a non-linear construction phase can be achieved; construction scheme safety is evaluated according to stimulation check of component stress and strain during the construction, so practical construction can be guided; strain displacement can be monitored during the construction; real-time adjustments can be conducted to components, so construction precision can be improved and building cost can be reduced.

The invention relates to a finite element modeling method for the welding line of a soldering board based on vehicle crash simulation, belonging to the vehicle computer-aided design technique field, comprising the following steps: first, baseplate modeling, which comprises baseplate hard spot arrangement, baseplate reseau partition, and baseplate reseau translation; second, building a double-beam welding line model, which comprises space nodes arrangement, a double-beam manufacturing, and connection of the beam and baseplate; third, the attribute assignment of the double-beam unit, which comprises the attribute assignment of beam unit material and the attribute assignment of the beam unit section; fourth, moving the built welding line model of the soldering board and the baseplate reseau model into an impact finite element computational model. The invention considers the material attributes of the welding line, as well as considers the shape of the welding line, can accurately simulate the deformational behavior of the welding line in crash simulation, enhances the simulation accuracy of vehicle crash, is rapid and effective, and is easy to master technicist.

The invention provides a large ship superstructure hoisting method which is implemented through the following steps: 1, calculating the whole weight and gravity center of the superstructure, configuring a hoisting point according to gantry crane equipment parameters and calculating the length and included angle of steel wire ropes; 2, designing a hoisting ring according the hoisting point and the whole weight; 3, carrying out reinforcement arrangement on the superstructure according to the hoisting point and stress distribution thereof; 4, establishing finite element modeling, carrying out whole strength check through finite element strength calculation, establishing a whole reinforced superstructure finite element model comprising the hoisting ring in MSC.Patran simulation software according to a structural drawing, and checking the whole and local strength through calculation; 5, reinforcing and modifying the steps 2 and 3 according to finite element calculation and strength check results, and rechecking; and 6, hoisting. Compared with the prior art, the method provided by the invention has the advantages of fully meeting technical indexes, obviously shortening the dock period at the same time, greatly relieving the defects of a ship integral assembly field and steadily improving the annual ship building quantity.

The invention discloses a method for optimized arrangement of a strain sensor. The method comprises the following steps of building a simplified bridge model, confirming a monitoring cross section needing to be provided with the strain sensor, building a structural multi-scale finite element model on a bridge section including the monitoring cross section, obtaining the position which is located on the monitoring cross section, is stressed adversely and needs to be provided with the strain sensor, building a mesoscopic model of a local detail of a critical element on the monitoring cross section, carrying out hot spot stress analysis, and confirming the spot distribution position of the local detail. By the help of a multi-scale finite element modeling strategy, the method provides an optimized scheme of the strain sensor in a health monitoring system of a bridge, especially a long-span bridge by different levels, can obtain the comprehensive information of structural critical positions with few strain sensors, and is both safe and economical.

The invention is an intelligent computer-aided engineering software system, which is an intelligent method that can be applied to machinery, automotive, construction, water conservancy, transportation, energy, aviation, aerospace, shipbuilding and other areas for structural design and analysis of CAE software system mesh generation. The first step is finite element modeling; the second step: mesh generation and intelligent encryption; imposing constraints; imposing load; reducing the burden of users to study, as well as boosting the request of the success rate of procedures automatically partition because there is no second algorithm as substitute. The automatic mesh, the ideal that it pursuit is 'one-button', namely only a mouse click on partition menu is needed, there is no need for any of the other operating.

The invention relates to a parameterization simulation method of lunar probe soft landing dynamics, and belongs to the technical field of deep space exploration. The method integrates finite element modeling, solving calculating and result post-processing, finite element models of all components (including a center body, a fuel storage box, a lunar rover, buffering pillars and a foot pad) of a probe can be generated, and assembly, working condition setting, solving calculating and result extracting can be finished automatically. By means of the method, automatic establishing of a parameterization model of the lunar probe soft landing dynamics is realized, re-handling brought to designing personnel by re-meshing and component connection relationship re-setting which are caused by the fact that a certain characteristic is changed in the finite element modeling process of the lunar probe is avoided, and the problem of designing efficiency in the dynamics analysis of the lunar probe soft landing process in the prior art is solved.

Discrete Element Modeling (DEM) of rock subject to high confining pressures, such as in a subterranean drilling environment, may be used to predict performance of cutting structures used in drill bits and other drilling tools, as well as of the tools themselves. DEM may also be used to create “virtual” rock exhibiting specific drillability characteristics with or without specific reference to any actual rock, for purposes of assessing cutting efficiency of various cutting structure configurations and orientations, as well as of drilling tools incorporating same.

The invention provides a method for establishing a temperature field model of a steel box beam bridge road system under high-temperature asphalt concrete paving. The model comprises a paving layer (1), a steel bridge panel (2), U-shaped ribs (4) and diaphragm plates (5). An interface thermal resistor (3) is arranged between the paving layer (1) and the steel bridge panel (2) and is used for reflecting a barrier effect of an adhesive layer in an adhesive layer-paving composite structure on temperature transfer. The method comprises the following steps: acquiring the optimal interface thermal resistance by using a test-numerical simulation mixed parameter analysis method and combining a numerical optimization technology; establishing an actual bridge numerical model, setting a movable temperature load (6) to simulate the paving construction process, and calculating and analyzing the temperature field distribution condition of the steel box beam bridge road system. The method mainly depends on finite element modeling, a thermal insulation effect of the adhesive layer can be well reflected, and the paving construction process can be really simulated. Compared with field measurement, the method is simple and feasible, different working conditions can be simulated, and the temperature field distribution condition of the steel box beam bridge road system can be accurately reflected.

The invention discloses a whole hoisting craft of a ship superstructure. The whole hoisting craft of the ship superstructure confirms a group of optical practical hoisting points through a finite element modeling analysis method according to a hoisting working condition requirement of a crane. Hoisting is conducted on the group of practical hoisting points, and deflection which is produced when the ship superstructure is hoisted is enabled to be minimum, so advanced outfitting can be conducted on the ship superstructure before the whole ship superstructure is hoisted so as to improve advanced outfitting rate of a ship block and shorten engineering period of a dock and a wharf. Meanwhile, the advanced outfitting enables the dock working platform to do aloft work on the ground. Therefore, the whole hoisting craft of the ship superstructure not only improves working environment of workers, but also greatly improves safety.

The invention discloses a method for simplifying an analysis model of a fatigue loading effect of an orthotropic steel bridge deck. The method comprises steps as follows: 10), performing finite element modeling on a large-span cable bearing bridge structure system, and building an overall structure dimension model; 20), building a partial detailed steel box girder model of the overall structure dimension model with a submodel method, and calculating an equivalent stress amplitude exact solution of a steel bridge deck part of the partial detailed steel box girder model; and 30), simplifying the partial detailed steel box girder model into a partial steel bridge deck stressing structure system, performing optimization analysis on a parameter value of the structure system based on the equivalent stress amplitude exact solution obtained in the step 20), and determining a simplified model for analyzing the fatigue loading effect of the steel bridge deck. The simplified model can guarantee the accuracy of a calculation result and improve the calculation efficiency for analyzing the fatigue loading effect of the orthotropic steel bridge deck greatly at the same time.

The invention discloses a method for calculating and analyzing the contribution of each vibration excitation system during vehicle operation. The method comprises the following steps of (S1) performing finite element modeling on a complete vehicle and performing modal simulation calculation, (S2) obtaining the information of a vehicle vibration excitation system through a test, (S3) importing dataobtained in the step (S2) into finite element analysis software, (S4) solving and calculating frequency response functions under the combined action of three directions of each vibration excitation system, the single action of the three directions of each vibration excitation system and the combined action of three directions of all vibration excitation systems, (S5) exporting data calculated bythe finite element analysis software and importing the data into numerical calculation software, and (S6) calculating the contribution of each vibration excitation system at a problem point and the contribution of each direction of each vibration excitation system during a vehicle running process. A contribution result obtained by the calculation and analysis method is accurate, and a reliable basis can be provided for the improved design of the vehicle.

The embodiment of the invention discloses a finite element model optimization device and method. The method comprises the following steps: through an experimental modal analysis method, obtaining the inherent frequency of a structure and the vibration form amplitude of each-order modal on an experiment detection point; establishing a structure finite element model, and establishing a corresponding finite element node on the position of the experimental detection point; calculating the frequency of a structural modal and the vibration form amplitude of each-order model on the finite element node; establishing a difference value of the vibration form amplitude of the experiment detection point and the vibration form amplitude of the corresponding finite element node to form first-order, second-order or high-order errors; and taking the minimization of the each-order error as an optimization objective to optimize the finite element model. The problem that finite element modeling is distorted in traditional structural modal calculation analysis is solved.

The invention discloses a method for rapid finite element modeling, solution and analysis based on image recognition. The method comprises the steps that an image is collected; a two-dimensional rectangular or three-dimensional cuboid geometric model is established, and grid division of the geometric model is carried out; according to unit numbers and an arrangement mode of a simple finite element model, and pixel numbers and the arrangement mode are stipulated; phase information of all the numbered pixels in the image is determined; a script document which can be recognized by finite element CAE software is generated; the script document is read, material attributes and unit type information of units with the same numbers in the simple finite element model are assigned or modified according to the phase information of each pixel of the script document, and a complicated finite element model containing different unit types and material attribute information is generated; and the complicated finite element model which contains the different unit types and material attribute information is loaded, solved and analyzed, so that a simulation result is obtained. The method has the advantage that the rapid and highly accurate finite element modeling can be achieved, and solution and analysis can be carried out; and deficiencies in a current finite element CAE software modeling method can be solved.

Long Elements Method (LEM) for real time physically based dynamic simulation of deformable objects. The LEM is based on a new meshing strategy using long elements whose forms can be straight or arbitrary. The LEM implements a static solution for elastic global deformations of objects filled with fluid based on the Pascal's principle and volume conservation. The volumes are discretised in long elements, defining meshes one order of magnitude smaller than meshes based on tetrahedral or cubic elements. The LEM further combines static and dynamic approaches to simulate the same deformable medium, allowing modeling a three-dimensional internal state at any point inside the deforming medium from a reduced number of explicitly updated elements. Complex elastic and plastic deformations can be simulated in real time with less computational effort. The LEM is particularly useful in real time virtual interactions, soft tissue modeling, and graphic and haptic rendering.

The invention belongs to the field of medical image processing and relates to a non-rigid medical image registration method based on a finite element model. The registration method comprises the steps of: carrying out global registration on floating images and reference images, then carrying out finite element modeling on the globally registered images and the reference images and finally computing the energy terms related to the model by adopting a classified registration thought in the registration process, wherein the energy terms comprise an internal energy term and an external energy term which drives the model to deform; and when the total energy of the model is minimum under the control of the internal and external energy terms, the model is converged at an equilibrium position so that the local accurate registration of the images is realized and the registration of the non-rigid images is finally realized. Experiments show that the local deformation of the non-rigid images canbe well simulated by using the method so that the accuracy and the speed of the registration are improved, the robustness of the registration is strengthened and a favorable foundation is laid for the fusion of medical images.

The invention provides a finite element modeling method based on a real material microstructure. According to the method, various kinds of digital image technical processing are carried out on SEM scanned pictures, conversion from bitmaps to vector diagrams is achieved, and accordingly the real material microstructure can be mapped into a two-dimensional finite element model. By means of threshold segmentation, gray processing, binarization processing, repeated switch-off and switch-on operations and the technology converting the bitmaps into the vector diagrams, defects presented in the images or reinforcements are clearly segmented from a substrate, and besides attributes of the defects or the reinforcements can be respectively defined in finite element software. According to the method, a high-precision finite element model of the real material microstructure is built directly through the SEM pictures, a digital model is close to a real structure, and authenticity of the finite element model in the calculation process and in calculation results is improved. The method can be widely used in the field of optimization design field taking the defects and heterogeneous material performance judgment into consideration.

The invention relates to a bevel gear dislocation quantity finite element computing method with multi-factor influences taken into account. The bevel gear dislocation quantity finite element computing method comprises the following steps that (1) a support shafting finite element model of a driving gear and a support shafting finite element model of a driven gear are established, wherein the driving gear and the driven gear are respectively composed of a gear shaft and a bearing; (2) a finite element model of a bevel gear drive system is established; (3) the influence of thermal expansion and tolerance fit on the stiffness of the bearings is taken into account; (4) the influence of axial thermal expansion on shafting deformation is taken into consideration; (5) the influence of the stiffness of a main reducing gear shell is taken into consideration; (6) a stiffness equation of the bevel gear drive system is solved, and the dislocation quantity of bevel gears is calculated. According to the bevel gear dislocation quantity finite element computing method, on the basis of a shafting finite element modeling method of a nonlinear bearing unit, processing of the gear pair is introduced, the finite element model of the bevel gear drive system is established, and the dislocation quantity of the bevel gears is calculated through a computation result of system deformation; meanwhile, the influence of thermal expansion, the influence of tolerance fit and the influence of the stiffness of the main reducing gear shell on system deformation of the bevel gear drive system and the dislocation quantity of the bevel gears are comprehensively taken into account, the problem that the factors can not be comprehensively taken into account in an existing analysis method is solved, and the dislocation quantity, obtained through calculation, of the bevel gears is closer to actual situations.