Takashi Yokohari

Notice of Retraction Automatic generation of weld models for railway rolling stock

The air-conditioning equipment and other structures attached to railway rolling stock are plate objects joined by a spot or an intermittent welding. The finite element (FE) modeling of such plate objects is very time-consuming due to the large number of spot and intermittent welds that must be modeled. We developed automatic weld modeling technology, with the aim of reducing the procedures for FE modeling. Applied to a test cover model, the technology reduced the modeling time to 1/3. And FE stress analysis showed that the result accorded to an experimental data within an error range of 11%.

Development of a Zooming Analysis System using 3-dimentional Geometric Model.

This paper describes a zooming analysis system that uses a three-dimentional geometric model. A finite element analysis (FEA) using a zooming technique is needed for the estimatation of stresses in a very small area. However, it takes a long time to make an FEA mesh model and set the analysis conditions of any part of the model. We have developed a technique that automatically creates the FEA mesh model and sets the analysis conditions of any part of the model. In this system, a user inputs a geometry and analysis conditions of the entire model as well as the geometry of any part of the model and carries out a whole-model analysis and a detailed analysis of the target part. Employing this zooming technique significantly reduces the analysis time.