Search Results

The authors propose computerized support for Fault Tree Analysis (FTA) based on new knowledge management in product design. FTA is a method of analyzing and visualizing the causes of a fault event by Fault Tree diagram (FT diagram) that has a tree structure with logical step. Many methods of support for FTA are studied, but they are not effective for our FTA. We have developed the system of Computer-Aided FTA (FTAid) for design engineers by the collaborative research group (JATCO Ltd, The University of Tokyo and National Institute of Advanced Industrial Science and Technology). We reported this system in SAE2012 World Congress. After that, the knowledge management for FTA and new functions of this system have been studied continuously. In this paper we report that FT diagrams used FTAid improved to be useful for design engineers are analyzed based on individual qualification and skill of FTA, we study improvement of FTAid and the FTA education system.

In this paper the authors propose computerized support for Fault Tree Analysis (FTA) based on new knowledge management in product design. FTA is a method of analyzing and visualizing the causes of a fault event by Fault Tree diagram (FT diagram) that has a tree structure with logical step. When we develop the new product, we use FTA to analyze the fault events, to extract design parameters, and to plan test programs in Jatco's development process. Although FTA is an effective analytical tool for resolving problems, improving design quality and planning test programs, it is not easy to complete the FT diagram of a fault on Automatic Transmission and the component system without a mistake. To solve this problem, we propose the following approach using Computer-Aided knowledge management based on Quantity Dimension Indexing and block diagram. We classify FT diagrams into component failure, system failure, and control failure diagrams.