Hitachi, Ltd.

Ichiro Nishigaki

Makoto Onodera

Masayuki Hariya

Yoshimitsu Hiro

Hiromitsu Tokisue

Ichiro Kataoka

Chie Takizawa

Hiroyuki Nemoto

Noriyuki Sadaoka

Chie Kobayashi

Satoshi Kanai

Yoshifumi Yamashita

Norihiko Nonaka

Hiromitsu Moriyama

Takashi Yokohari

Keiko Hoshino

Hiromi Aoyama

Hiroaki Date

Kenji Kishinami

Tatsuro Yashiki

Generation of a mesh model that can be analyzed with sufficient analysis accuracy for result evaluation and within a minimum possible calculation time even if a user does not grasp a tradeoff relation between analysis accuracy and analysis time due to mesh size is made possible. A mesh generation system designates an evaluation point (site) on an analysis target shape, analyzes plural analysis model data created with plural types of mesh size, stores a relation among mesh size, analysis result and calculation time in a mesh know-how DB, search for a mesh size which meets a required accuracy and calculation time limit, sets the mesh size that is found by the search to an analysis model. And displays the relation among mesh size, analysis result and calculation time.

Mesh generation system

An analysis model generation system, for generating an analysis model of an analysis target, by correcting a distortion configuration owned by a configuration mesh data, which is generated by changing configuration of the analysis target, being made up with hexahedrons, into meshes, comprises a mesh data read-in portionfor reading the configuration mesh data therein, a mesh quality estimate portionfor estimating quality of a mesh of the configuration mesh data, a first databasefor classifying distortion configuration of the mesh into a pattern, so as to register it therein as a distorted mesh pattern, in advance, a mesh pattern determination portionfor determining, on which one of the distorted mesh patterns a distortion corresponds, when the mesh has the distortion as a result of the quality estimation within the mesh quality estimation portion, a second databasefor registering therein correction methods for correcting the distortion, corresponding to the distorted mesh pattern registered in the first database, a mesh correcting portionfor correcting the distortion of the mesh upon basis of the correction method, and a mesh data display portionfor displaying a result of conducting the correction.

Analysis model generation system

A system is provided for creating a modified analytical model from an existing analytical model and CAD data (geometric model data) of the modified model to reduce the workload in creating geometric and analytical models. The system includes means for reading a geometric model and an analytical model which are to be modified; means for storing correlation data showing relations between geometric elements of the object geometric model and nodes of the object analytical model; means for modifying the object analytical model to create a modified analytical model; and means for extracting geometric elements of the object geometric model which do not include the nodes in the modified object analytical model related to the object geometric model's geometric elements extracted from the correlation data and performing geometric fitting so as to fit the extracted geometric elements to the nodes to create a modified object geometric model from the modified analytical model.

Geometric modeling system and optimization method for geometric fitting

It is possible to automatically correct a six-plane body mesh pattern so as to satisfy the required quality. A device for generating a mesh pattern for analysis comprises: surface mesh generating device for generating a surface mesh pattern of an analysis object by acquiring shape model data on the analysis object and mesh control data including required quality of an analysis mesh model; internal mesh generating device for generating an internal mesh pattern of the analysis object according to the generated surface mesh pattern; device for calculating the element quality of surface meshes; quality evaluating device for evaluating calculated element quality according to the required quality; and mesh correction device for shifting a surface mesh node point not satisfying the required quality in the direction to improve the quality.

Method of generating mesh for analysis

A tetrahedral mesh generating method for finite-element analysis executable by a computer, using edge collapse and quality conserve arrangements.

Tetrahedral mesh generating method for finite-element analysis and finite-element analyzing system using its method

A mesh generating method for numerical simulation of one (1) piece of an analysis target, in a short time period, where there are plural numbers of high-density configuration data, each presenting a configuration surface thereof said one (1) piece of analysis target, including the performing of a plurality of sub-steps until when none of the plural numbers of configuration mesh data remains, and mesh data for numerical simulation is generated from the final combined low-density configuration mesh data.

Mesh generation method for numerical simulation

A joint portion of a profile model is retrieved from three-dimensional CAD model data and a joint target part, a joint position and a joint are registered as parts joint data. A joint model preparing object corresponding to the parts joint data is retrieved from a joint model preparing object database, a joint model preparing process registered in the joint model preparing object is executed to prepare a joint model, and the joint model and a neutral plane model are synthesized to prepare an analytic model.

Analytic model preparing apparatus and storage medium and apparatus storing analytic model preparing program

A design work assistance apparatus, comprising: a design work guidance means for guiding along with a process template, which represents processing steps of design work process by unit work processes in a sequence thereof; a design work history accumulation meansfor accumulating data of design work history, in particular information relating to failures in the past, by referring to a predetermined unit work process in parallel with the design work guidance; and a knowledge visualizing meansfor transmitting information, which has high importance among the accumulated data of the design work history (for example, a failure case), to a design worker, thereby achieving the design work guidance with utilizing the cases of the past design works effectively.

Design work assistance apparatus

A shape data creating apparatus for creating shape data by utilizing a database has an operation measures database. The operation measures database stores attributes of working accuracy, reliability and working cost in a unit of operation of working or assembling. A shape operation measures selecting unit selects a measure used for practical work from a plurality of measure possibly used for working and assembling. A totaling unit calculates workability, assembling efficiency and cost of a shape when working measure and assembling measure selected by consulting attributes stored in the operation measures database are used. A process database stores operation processes of working and assembling. Addition, deletion and order change in an operation process are processed by a shape operation process editing unit.

Method and apparatus for creating shape data

A work assistance apparatus executes software programs necessary for works with using a computer, files generated in plural number thereof, and know-how data, with high efficiency. For that purpose, the work assistance apparatus includes a common template production portion for producing a common template, in which common information is defined, such as, steps of work, the software programs, and the know-how, etc.; a template execution portion for executing the work in accordance with the template; and a difference template production portion for producing information not defined in the common template in a form of a difference template. In the work with using the common template, information newly added is accumulated into the difference template.

Work assistance apparatus and memory medium for use therein

A numerical analysis mesh generating method, wherein a geometric model under analysis is inputted, a verification model having the geometry analogous to the geometric model is selected, the geometric model is corresponded to the verification model in terms of the geometry, a previously created mapping model approximated from the verification model with a lattice is read, the mapping model of the verification model is modified from a geometric correspondence between the geometric model and the verification model to create a mapping model for the geometric model, and lattice points in the created mapping model for the geometric model are mapped to the geometric model to create a numerical analysis mesh.

Numerical analysis mesh generating method and apparatus

A hexahedral mesh generation device comprises a shape model reader that reads an analysis object shape model, a polygonal patch generator that generates polygonal patches on the surface of the shape model, a mapping model generator that has a function to select line segments necessary for generating a mapping model from boundaries between polygonal patches, and a analysis mesh generator that generates an analysis mesh from the mapping model.

Hexahedral mesh generation method and device

A shape model as an object to be analyzed and division information used to produce a finite element mesh are entered, and a recognition model is produced by allocating each edge line segmented by structural points of the shape model to any one coordinate axial direction in an orthogonal coordinate system. A mapping model is produced in which an orthogonal lattice is produced on a surface and the inside of an approximated shape model, and is displayed on a screen. The mapping model is modified by a system user in an interactive operation. A finite element mesh is generated from lattice points of the modified mapping model. The data input by the system user is processed in an input/output data processing unit, and shape model data of the object to be analyzed is produced in a shape model producing unit. Based on the division information input by the system user, a finite element mesh is generated on the shape model by a finite element mesh producing unit. The line segment allocation directions of the recognition model are displayed in a recognition model producing unit, so that an allocation direction can be modified in a recognition model modifying unit by the system user in a interactive mode. The finite element model data produced from the optimized recognition model is registered into a database.

Growing community of inventors

Ishioka, Japan

Ichiro Nishigaki