Hitachi, Ltd.

Yoshimitsu Hiro

Makoto Onodera

Ichiro Nishigaki

Masayuki Hariya

Ichiro Kataoka

Hiromitsu Tokisue

Masaki Shintani

Chikara Kongou

Yoshiyuki Yamamoto

The present invention enables easy generation of analysis mesh data from larger CAD data including complicated partial shapes without performing shape division of CAD data. An analysis mesh data generating device comprises: a storage device configured to store CAD data, model CAD data, and model mesh data associated with the model CAD data; and a control device. The control device searches for model CAD data similar to a partial shape in the CAD data from the model CAD data stored in the storage device, obtains model mesh data associated with the retrieved model CAD data from the storage device, calculates an application position of the model mesh data at analysis mesh data generated from the CAD data, deletes mesh data relate with the partial shape in the analysis mesh data, and combines the model mesh data at the calculated application position.

Analysis mesh data generating method and analysis mesh data generating device

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

An analytical model creation system can create a desired analytical model by adding a given shape change to an existing analytical model. The system includes an adjacent partial analytical model interlocking section for performing an interlocking change process. The interlocking change process is performed on the existing analytical model as a combined analytical model comprising a plurality of partial analytical models. The process assumes any one of the partial analytical models in the combined analytical model to be a change-targeted partial analytical model. The process allows a partial analytical model adjacent to the change-targeted partial analytical model to reflect a shape change given to the change-targeted partial analytical model. The process thereby makes a shape change to the adjacent partial analytical model in interlock with the shape change.

Analytical model creation system

The present invention provides an analytical model preparing apparatus which reduces the user's labor of template selecting operation by selecting and presenting an appropriate template from among a plurality of already prepared templates. The analytical model preparing apparatus of the invention comprises means for entering a shape model to be analyzed; a database which associates at least one already prepared shape model with the analytical model prepared for such an already prepared shape model, and registers the same; means for collating the above-mentioned shape model to be analyzed with at least one already prepared shape model; analytical model preparing means for preparing at least one analytical model corresponding to the shape model to be analyzed, by use of analytical model preparing information prepared for the above-mentioned already prepared shape model, in accordance with the result of collation; and mesh quality evaluating means for calculating a mesh quality evaluation value for the analytical model corresponding to at least one prepared shape model to be analyzed.

Analytical model producing method and analytical model producing apparatus

An analytical shell-model producing apparatus for converting a three-dimensional model into internal surfaces, wherein an internal surface is used to represent each three-dimensional element of the three-dimensional model. Each internal surface comprises a bounded plane and an associated width attribute, wherein the bounded plane is located internal to the three-dimensional element which it represents, and wherein the associated width attribute represents the width of the three-dimensional element in a direction normal to the bounded plane.

Analytical shell-model producing apparatus

An analytical shell model forming apparatus includes a medial surface forming unit for approximating a solid model to a plurality of shell models. An extracting unit compares a plurality of formed medial surface models and extracts difference portions. A model candidate forming unit forms a plurality of medial surface model candidates suitable for analysis by combining the extracted difference portions. A select unit selects a medial surface model matching boundary conditions, constraint conditions and the like from the plurality of model candidates. The selected medial surface model is presented to an operator as an analysis medial surface model.

Analytical shell model forming apparatus

An analysis model producing/assisting apparatus produces a recognition model, approximating surfaces of configuration and ridgelines thereof by planes and lines, from a configuration model showing the configuration. Thereafter, it produces a mapping model through dividing the recognition model into cubic grids, and then produces an analysis model, through mapping grid points of the mapping model onto the configuration model. When producing the recognition model, know-how for producing the analysis model, which gives an influence upon quality of the meshes of the analysis model, is take out from a database, and that know-how for producing the analysis model is applied onto the configuration model.

Analysis model producing/assisting 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.

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Yokohama, Japan

Yoshimitsu Hiro