Hitachi, Ltd.

Masayuki Hariya

Makoto Onodera

Ichiro Kataoka

Ichiro Nishigaki

Yoshimitsu Hiro

Masaki Shintani

Yuki Itabayashi

Chikara Kongou

Chie Takizawa

Akira Kamei

Hiromitsu Tokisue

Nobuyuki Isoshima

Kazuo Muto

Takashi Hamaguchi

Yuuki Shimizu

Hiroki Kawamoto

Yixiang Feng

Zixian Zhang

Qi He

Shingo Noro

Yoshiyuki Yamamoto

Generation of a search key shape for identifying a dedicated shape with respect to three-dimensional CAD data is facilitated. A shape group registration unit registers multiple pieces of three-dimensional CAD data; a feature amount computation unit computes a feature amount with respect to each of the registered pieces of three-dimensional CAD data; a clustering unit clusters the pieces of three-dimensional CAD data based on a feature amount; a cluster center computation unit determines a feature amount of a cluster center of each cluster from a feature amount of three-dimensional CAD data; and a search key shape registration unit registers feature amount data of a cluster center as feature amount data of a search key shape.

Support device and search key shape registration method

An input data creation device for powder additive manufacturing that can design and provide an appropriate support that avoids manufacturing failure. The device creates input data of a model in which a support is provided to a manufacturing designed object in powder additive manufacturing. The device includes a mechanical quantity calculation unit including a mechanism configured to calculate a mechanical quantity generated on a surface to which the support is provided in the manufacturing designed object; and a support shape determination unit including a mechanism configured to determine, based on information on a plurality of types of support shapes, information on an allowable mechanical quantity defined for each support shape, and a mechanical quantity calculated by the mechanical quantity calculation unit, an optimized support shape having an allowable mechanical quantity equal to or greater than the calculated mechanical quantity from among the plurality of types of support shapes.

Input data creation device for powder additive manufacturing

A design support device includes a unit that accepts registration of normal CAD data with a past record and violation CAD data determined to have violated portion with respect to three-dimensional CAD data, a unit that acquires a parameter related to a design rule from CAD data to be evaluated, a unit that calculates a statistical value of the acquired parameter and calculates a value of an influence degree t that explains a violation of each parameter, and a unit that presents a scatter diagram plotting normal CAD data and violation CAD data to be evaluated and a boundary line subjected to cluster analysis, on a two-dimensional coordinate system, according to a combination of parameters designated by a user (evaluator).

Support device

A shape search unit () that repeats processes of comparing each shape element of current shape data () or previous difference shape data () with each shape element of existing shape data (), setting a set of shape elements that are similar to each other as a result of the comparison as common shape data (), on the other hand, and setting a set of shape elements that are not similar to each other as next difference shape data (), until the common shape data () is not extracted from the difference shape data (), a common mesh extraction unit () that searches for corresponding common mesh data () from an existing model database () using the common shape data () as a search key are provided.

Analysis model creation assistance device and analysis model creation assistance method

The present invention is a data transfer system that can transfer, with respect to simulation result data, physical quantities necessary for a user, further perform area division based on characteristics of physical quantities, designate an allowable range of a compression error according to a purpose for each of divided areas, compress the data on the basis of the designated error range, transfer the data, and further display an error of each of the divided areas for each of the physical quantities on a receiver/client side.

Data transfer system and method

A hexahedral mesh generator for an analysis model generation target includes an existing analysis model database that stores shape data of existing analysis models before and after shape decomposition, a shape decomposition part extracting module that compares the shapes existing analysis models before and after the shape decomposition, a shape comparison module that compares each shape decomposition part with the analysis model generation target and checks whether the shape decomposition part coincides with at least part of the analysis model generation target, a coinciding shape decomposition part display/selection module that displays coinciding shape decomposition parts and outputs shape decomposition parts selected by the user, a shape decomposition module that decomposes the shape of the analysis model generation target in the same way as the outputted shape decomposition parts, and a hexahedral mesh generating module that generates the hexahedral mesh for the analysis model generation target after undergoing the shape decomposition.

Hexahedral mesh generator

A numerical analysis data evaluation apparatus includes: a shell generation model which converts a three-dimensional shape model into a three-dimensional shell model so that a thickness on an analysis model becomes zero; a front surface-side physical quantity projector and a rear surface-side physical quantity projector which interpolate physical quantities of front surface-side elements and physical quantities of rear surface-side elements of the three-dimensional shape model obtained as a result of the numerical analysis in on-shell model element data obtained by spatially discretizing the three-dimensional shell model, and project the physical quantities on front surface-side physical quantities and rear surface-side physical quantities of on-shell elements; an on-shell element front surface-side physical quantity data storage unit; an on-shell element rear surface-side physical quantity data storage unit; and an arithmetic unit which calculates differences between the front surface-side physical quantities and the rear surface-side physical quantities of the on-shell elements.

Numerical analysis data evaluation apparatus and thermal fluid pressure data evaluation apparatus using the same

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 model simplification apparatus performs: inputting a 3D geometric model; forming a surface mesh on the input geometric model and registering the surface mesh as an initial mesh; classifying the surface mesh into partial surface meshes, and calculating feature quantities of the partial surface meshes; inputting each group of mesh elements of the geometry features as reference feature shapes; searching for groups of mesh elements of similar geometry features to the reference feature shapes. Furthermore, removing group of mesh elements corresponding to the similar feature shapes from the initial mesh, and forming simplified mesh parts instead of removed similar feature shapes.

Model simplification apparatus and program

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 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 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.

Growing community of inventors

Kasumigaura, Japan

Masayuki Hariya