Research

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1. Development Infrastructure Software VCAD Framework

(Fig.1-2 Cast simulation using VCAD)

(Fig.1-1 Cutting surface by volume information)

The VCAD Modeling Team handles the development of the VCAD infrastructure software "VCAD Framework" aiming to realize novel CAD software which can handle volume data consisting of three-dimensional shape information as well as material information (physical properties). This VCAD (Volume CAD) technology is capable of robust data description which can be shared between different simulation processes, and will play a central role in the construction of production systems which can be directly used for high speed and ultraprecision machining processes.

2. Modeling of Attributes and Shapes Using Implicit Function

(Fig.2-2 Shape representation and deformation of haibahao )

(Fig.2-1 Shape representation by SLIM surface)

To realize the use of the same volume data for a series of processes ranging from structural analysis from actual objects to thermal fluid analysis, casting analysis, machining and inspection, the VCAD Modeling Team proposes methods to reconstruct three-dimensional surfaces by assigning implicit function surfaces to point group data obtained by sampling shape surface, and implement these methods on the VCAD system. We are also working on the development of methods to convert polygons to implement function surfaces, methods to convert implicit function surfaces to VCAD Kitta Cube surfaces, and direct drawing methods using GPU.

3. Simulation of Fluid and Structures Using VCAD

(Fig.3-2 Simulation of structural stress using V-X3D)

(Fig.3-1 Simulation of fluid flow using V-Flow)

The practical application of the VCAD system to support Japanese-style manufacturing is strongly looked forward to by industry. The VCAD Modeling Team carries out research on simulation techniques of fluid and structures using VCAD data directly. Amongst software that have been developed and available for download include V-Flow for precision simulation of thermal fluid with complicated shapes in a short time, V-X3D for predicting metal stress damage, etc.

4. Fundamental Theoretical Research for Development of Volume CAD

(Fig.4 Mesh generation by subdivision technique)

The VCAD Modeling Team carries out fundamental theoretical research for generating precise volume data for physical simulations from various perspectives for the precise and speedy description of large 3D complicated physical shapes on computer. Some examples include improving accuracy of data using kitta Cube technique, subdivision analysis and expansion of volume, and high speed calculation of large 3D spatial fields.