3380 results about "Element analysis" patented technology

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.

An automated name searching system incorporates an automatic name classifier and a multi-path architecture in which different algorithms are applied based on cultural identity of the query name. The name classifier operates with a preemptive list, analysis of morphological elements, length, and linguistic rules. A name regularizer produces a character based computational representation of the name. A pronunciation equivalent representation such as an IPA language representation, and language specific rules to generate name searching keys, are used in a first pass to eliminate database entries which are obviously not matches for the query name. The methods can also be implemented as a callable set of library routines including an intelligent preprocessor and a name evaluator that produces a score comparing a query name and database name, based on a variety of user-adjustable parameters. The user-controlled parameters permit tuning of the search methodologies for specific custom applications.

A computational technique to construct a 3-D valve leaflet geometry. The invention pertains to methodology to construct a 3-D heart valve leaflet geometry using finite element analysis (FEA) to simulate the manual assembly process or, in other words, provide a virtual assembly process as an input to a subsequent simulated valve testing step. The simulated valves may be subjected to simulated cyclic valve opening and closings and the stress levels induced therein monitored. Simulated valve designs with lower principal stresses can then be selected for prototyping. Proposed valves can be subjected to cyclic fatigue stress testing under simulated physiologic conditions to study valve durability.

A system and method for virtually fitting an article of clothing on an accurate representation of a user's body obtained by 3D scanning of the user in minimal clothing and in standard garments of known properties. A graphical user interface allows the user to access a database of garments and accessories available for selection for the virtual fitting simulation for which each garment's physical and material properties are known. A finite element analysis is applied to determine the shape of the combined user body and garment and a an accurate visual representation of the selected garment or accessory on the proportional model of the user's body based on the analysis is generated. Means are also provided for the user to solicit custom garments or accessories from a participating designer or retailer, purchase selected garments or accessories from the participating designer or retailer, and communicate his or her preferences with participating designers, retailers, or other users.

Micro-regional force application improves the control of the orthodontic movement of teeth in all six degrees of freedom. Micro regional force application utilizes an elastic repositioning appliance, a tooth positioner, a polymeric shell, or preprogrammed series of polymeric shells. The key components of the invention are the envelope of freedom, the force applicators, force couplers, counterpart coupling, vector modifiers, seating guides, decouplers, and forced balance points. Further, computerized finite element analysis determines the center of resistance and the center of rotation for each tooth to be moved. The present invention gently rotates and translates one or more teeth to a desired straight position within a treatment plan.

Methods and apparatus for orthodontic treatment planning that involve determining an initial position of an orthodontic structure, determining an altered position, and generating response surface data using a mathematical relationship between the positions. The mathematical relationship may be defined by a number of parameters useful for determining one or more of the stress, strain, force, and moment associated with movement of the orthodontic structure. The mathematical relationship between the initial position and the altered position may be defined using a finite element analysis, empirically determined, or using other computational methodologies such as a finite difference methodology. The mathematical relationship may also be defined using an analytical methodology, such as elasticity and / or plasticity methodologies. Response surface data may be generated as a teaching aid, treatment planning aid, table, or other useful form, which may be useful, for example, for designing an orthodontic appliance, verifying an orthodontic prescription, and / or planning the prescription.

In one aspect of the invention, each bolt is modeled using a beam element in a FEA model. To apply desired pretension to one or more bolts, at least one pretension-versus-time curve is specified. Each pretension-versus-time curve includes ramp portion, desired pretension portion and optional unloading portion. Duration of the pretension-versus-time curve generally covers first 0.5-1% of total simulation time of a car crashworthiness analysis. Ramp portion starts from zero to desired pretension in a substantially linear manner, and hence being configured for applying desired pretension to a bolt gradually with smaller increments. Desired pretension portion is configured for ensuring the desired pretension can actually be applied to the beam element during an initialization process—a series of quasi-static analyses. Since the method is independent of the deformation of the beam, the method completely avoids the need to iteratively determine an axial strain or displacement that gives the desired pretension.

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.

A method for modeling deformation in subsurface strata, including defining physical boundaries for a geomechanical system. The method also includes acquiring one or more mechanical properties of the subsurface strata within the physical boundaries, and acquiring one or more thermal properties of the subsurface strata within the physical boundaries. The method also includes creating a computer-implemented finite element analysis program representing the geomechanical system and defining a plurality of nodes representing points in space, with each node being populated with at least one of each of the mechanical properties and the thermal properties. The program solves for in situ stress at selected nodes within the mesh.

The invention relates to an online predicting method of damage and service life of a high temperature pipeline. The method comprises the following implementing steps of: (1) carrying out finite element simulation analysis of damage and coupling to the high temperature pipeline; (2) finding out important monitoring parts according to the analysis results, arranging a sensor and monitoring the strain of the sensor; (3) carrying out finite element analysis (including analytical subprogram of a constitutive equation) for different working conditions and establishing database with damage, strain and residual life and strain; and (4) carrying out online inquiry and comparison to strain values detected online and the value of the load working condition and the data in the database so as to obtain the assessment value of corresponding damage and residual life. The online predicting method has the advantages of being capable of carrying out real-time monitoring to the high temperature pipeline in operation while production is carried out normally, reflecting the deformation and damage of the important parts and key parts in time, making correct estimation to the use life and residual life of the pipeline, being beneficial to guaranteeing safe production, adjusting the production load, planning maintenance reasonably and effectively prolonging the service life of production equipment.

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.

Methods of selecting a configuration of fixation and compression screws for a bone plate to be installed on a bone of a patient. A computer or website allows a user to load images of a fractured bone and specify a particular configuration of fixation and compression screws with a plate on the loaded bone. The computer replicates stresses imposed on the bone by regular activities using finite element analysis and provide information about the suitability of the selected configuration.

The invention provides a finite element analysis method for the temperature action on a prestressed reinforced concrete continuous rigid frame bridge. The finite element analysis method is used for analyzing and calculating the stress and displacement distribution in the construction and finished bridge stage under different temperature gradient models, and provides references for designing and optimizing the prestressed reinforced concrete continuous rigid frame bridge. Through calculational analysis based on finite elements and the structural mechanics, the forward-calculation method is adopted for structural distortion and stress analysis according to the actual construction loading sequence of the bridge structure, so that the complex mechanics problem of box girder temperature self-stress, temperature secondary internal force in a prestressed reinforced concrete statically indeterminate structure and secondary stress of the temperature secondary internal force is solved easily, conveniently and efficiently, and the finite element analysis method has important practical value.

Low-power, low flow-rate, portable, miniaturized plasma devices are provided. A portable, low-power, low flow-rate, miniaturized sample introduction device is also provided. The devices are inexpensive to make, have low operating cost and can be used with a variety of gases and gas mixtures. The devices can be used for elemental analysis from liquid or solid micro-samples by optical emission or mass spectrometry provided that an appropriate sample introduction system is used.

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.

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.

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.

A method is provided for detecting one or more analytes in a sample. The method relies, in part, on the ability of functionalized particles added to the sample to partially or completely inhibit the transmission of electromagnetic radiation into and out of the sample through a detection surface in a reaction vessel containing the sample. In a microarray format, the invention can be used to screen millions, billions or more biological elements, such as an organism, cell, protein, nucleic acid, lipid, saccharide, metabolite, or small molecules. Methods, apparatuses and kits are described.

A self-optimizing, inverse analysis method for parameter identification of nonlinear material constitutive models utilizes the global force and displacement boundary loadings that are experimentally identified to globally search for initial constitutive parameters using a genetic algorithm. The initially identified constitutive parameters are then iteratively optimized by a simplex method in which two nonlinear finite element analyses are conducted in parallel using updated material constitutive parameters under the experimentally measured force and displacement boundary loadings. Stress and strain values for both the force and displacement finite element analyses are then input into an implicit objection function. Finally, the simplex optimization is performed for a number of predetermined number of iterations, whereupon the start of each new iteration utilizes the previously optimized set of constitutive parameters.

The invention discloses a real-time bridge load identification method based on an influence matrix. The method includes: according to bridge monitoring aims and precision requirements, setting displacement, angle and strain sensors on a bridge; according to bridge structural form and load features, equaling bridge load into a feature load combination; establishing a finite element analysis model for the bridge, and separately calculating measured values of each sensor caused by each unit feature load; combining the measured values of the sensors caused by the unit feature loads into the influence matrix; according to the measured values of the sensors, calculating the magnitude of the feature load, as current actual load of the bridge; and calculating deformation and stress mechanical parameters of a concerned position of the bridge, and evaluating safety state of the bridge according to the mechanical parameters. The method is applicable to various types of identifiable or equivalent basic loads and various type of measurement information, including absolute or relative displacement, absolute or relative angle, strain, internal force, external force and the like.

Improved topology optimization for engineering product design is disclosed. An engineering product including a design domain to be optimized is defined. Design domain can be a portion of or the entire engineering product. Design objective and optional constraint are also defined such that optimization goal can be achieved. Additionally, initial configuration of the design domain is represented by a finite element analysis (FEA) mesh. Each element or element group is associated with a design variable. A set of discrete material models is created from the baseline material used for the design domain. The set of discrete material models is configured to cover entire range of the design variable and each discrete material model represents a non-overlapping portion. Each element representing the design domain is associated with an appropriate discrete material model according to the design variable. Structure response of entire engineering product is obtained via FEA to evaluate design objective and update design variable.

The invention discloses a department triage system based on diagnostic element analysis, belonging to the field of medical information processing and network application. The department triage system comprises a logic calling management and service interface, a suspected disease reasoning module, a department reasoning module, a knowledge node positioning module, a knowledge node association module, a user guide module and the like. According to the symptoms provided by a user, diseases associated with the symptoms are searched in a predetermined disease database and ranked from high to low according to relevancy or suspecting probability; and visiting department analysis is conducted according to the suspected disease selected by the user. The triage and distribution pressure of hospitals is effectively relieved, people are prevented from seeing a doctor blindly, especially, patients suffering from infectious diseases are prevented from seeing a doctor blindly and staying at public area, pathophoresis and cross infection are avoided; and the public are enabled to clearly know which department to go to under the condition of preliminarily knowing about the probability of falling ill, and the informatization degree of triage consultation operation is improved.

The invention relates to a method for simulating an aero-optical effect. The method comprises the steps of conducting thermal and structural analysis to an optical window by adopting a finite element analysis method to obtain a finite element analysis result, and calculating multi-frame wave-front errors according to the finite element analysis result; fitting the current frame wave-front error to be a Zernike polynomial coefficient vector q; calculating control voltage vectors of all actuators of a deformable mirror and control voltage vectors of all actuators of a tilting mirror according to the q; and adjusting the actuators of the deformable mirror according to the control voltage of the deformable mirror, adjusting the actuators of the tiling mirror according to the control voltage of the tiling mirror, acquiring and saving distorted images on an imaging detector and again fitting the q according to the current frame wave-front error. The invention additionally discloses a system for simulating the aero-optical effect. By using the method and the system provided by the embodiment of the invention, dynamic distorted image data under the influence of the aero-optical effect can be obtained and experimental conditions are provided for researches on the correction of the aero-optical effect.

A soft measurement method of industrial production melt index on PP polymerization includes selecting nine variables influencing variation of melt index as input variables of soft measurement mode, using master element analysis to pick up main composition from input variables for eliminating off relativity between variables, applying radial based function neuro-network to set up nonlinear model between input and output as well as simultaneously utilizing fuzzy genetic algorithm to carry out optimum selection on model parameter.

The invention discloses a method for evaluating the fatigue life of an aged reinforced concrete bridge. The method comprises the following steps of obtaining initial corrosion time of reinforcement in concrete based on the second diffusion law of Fick, and considering the influence of concrete cracking due to corrosion expansion in a corrosion rate model; adopting a small crack growth and near threshold growth analysis and determining relevant parameters of fatigue crack propagation rate of materials by developing a fatigue crack propagation test of reinforced concrete materials; performing a corrosion fatigue test or finite element analysis on corroded reinforcement to obtain stress concentration factors at different corrosion levels, and integrating into a stress intensity factor model to obtain the fatigue crack propagation rate of the reinforcement under the influence of corrosion; comparing the magnitude of a corrosion pit growth rate and the fatigue crack propagation rate and gradually converting into a single growth analysis on fatigue cracks of the reinforcement; meanwhile, combining with vehicle load observing information to realize life evaluation of a bridge at different service stages. The prediction method disclosed by the invention is reasonable and high in popularization, and can provide technical support for evaluating the life of the concrete bridges.

The invention provides a method for constructing a vertebral three-dimensional geometry and finite element mixture model, which belongs to the technical field of processing of medical images. The method comprises the following construction processes of: inputting a vertebral computer tomography (CT) image; performing three-dimensional reconstruction and three-dimensional cutting on the CT image to acquire a vertebral three-dimensional image set; establishing a three-dimensional geometric statistical model, namely defining and manually calibrating vertebral characteristic points, aligning and registering vertebral images, and training a sample set to acquire the statistical model; and generating a finite element model, importing the statistical model, generating a surface mesh model, and generating a volume mesh model, wherein the model can be directly imported into finite element analysis software for biomechanics analysis. By the method, a vertebral geometrical shape can be precisely described, the accuracy of finite element analysis results can be ensured, and the precision of vertebral models can be improved. The method is convenient to use, facilitates the scientific measurement of the shapes and the stress of vertebras and can be used for researches related to vertebral columns and the vertebras in the field of surgical medicine.