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5 September 2011

University of Tokyo
National Institute of Advanced Industrial Science and Technology (AIST)

Fault Tree Analysis Support Software Developed,
Allows for High Design Reliability


JATCO Ltd. (President & CEO Takashi Hata) (hereafter referred to as “JATCO”), a manufacturer specializing in automotive transmissions (AT/CVT), together with the University of Tokyo (President Junichi Hamada) (hereafter “University of Tokyo”) and the National Institute of Advanced Industrial Science and Technology (President Tamotsu Nomakuchi) (hereafter “AIST”), through cooperation among industry, government and academia , have developed Fault Tree Analysis (FTA) support software to achieve high reliability of design.

FTA is a method of analyzing failure factors by arranging the sub events that are the factors behind the failure event in a sequential tree structure. While it is known as an effective method for improving product quality and reliability, creating and editing tree structures requires considerable manpower. By reducing engineers' workloads and improving analytical quality, this software is expected to help enhance design reliability.

Details concerning this technology will be presented at the 21st Conference of the Japan Society of Mechanical Engineers, Design and Systems Division held at Yamagata University from October 21 to 23, 2011.

[Main points about the software ]
- Improves the ability to analyze a product’s failure phenomenon while cutting engineers' workloads by 50%
- Allows for the development of techniques for verifying (indicating/displaying faulty areas) the validity of fault factor analyses (Uses quantity dimension technology for failure events)
- Helps improve product design quality

FTA Support Software Concept

[Plans Going Forward ]

Trial versions of the FTA support software will be distributed to JATCO’s suppliers, and the software's functions and impact on quality improvement activities will be evaluated and verified.

[Developers ]


Yoji Hiraoka, Manager Katsunari Yamamoto 

Quality Planning and Administration Department

University of Tokyo

Tamotsu Murakami, Professor Department of Mechanical Engineering, School of Engineering


Yoshiyuki Furukawa, Researcher

Hiroyuki Sawada, Group Leader

Manufacturing Information Group, Advanced Manufacturing Research Institute


For details


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