TRIZ Paper: Japan TRIZ Symposium 2010 | |
Guiding Noise and Vibration Design along General TRIZ Process by Misunderstanding Case List | |
Masao Ishihama (Kanagawa Institute of Technology, Japan) | |
The Sixth TRIZ Symposium in Japan, Held by Japan TRIZ Society on Sept. 9-11, 2010 at Kanagawa Institute of Technology, Atsugi, Kanagawa, Japan |
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Introduction (from "Personal Report of Japan TRIZ Symosium 2010" ) by Toru Nakagawa (OGU), Mar. 21, 2011 | |
Posted: Sept. 25, 2010 |
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Editor's Note (Toru Nakagawa, Sept. 22, 2011)
This paper was presented last year by Masao Ishihama in an Oral session of the 6th TRIZ Symposium in Japan, 2010 . Japan TRIZ Society has posted the presentation slides of this paper, among other contributed papers, in PDF in its Members-only page of the Official Site since last March. .
For wider circulation of TRIZ papers, I have selected about half of the papers presented at the Japan TRIZ Symposium 2010 and am posting them publicly in this Web site both in English and in Japanese, under the permission of the authors. Nakagawa's introduction/review to each paper was written and posted in "Personal Report of Japan TRIZ Symosium 2010" from November 2010 to April 2011, and is reposted in each page of the paper.
The present page is composed of the followings:
English page (the present page) Japanese page Abstract (in HTML) (in PDF ) Extended Absract (in HTML) (in PDF ) Presentation slides in PDF (in this Web site) Presentation slides in PDF (in this Web site) Nakagawa's Introduction (Excerpt of "Personal Report") -- The Author previously developed a TRIZ-based standard process for guiding engineers to work on the Noise and Vibration Design, especially for vehicles. However, in addition to such a normal guidance, he has found the importance of showing them negative lessons, i.e., cases of misunderstanding. So he built up a knowledgebase of misunderstanding cases of Noise and Vibration design.
[1] Abstract
Guiding Noise and Vibration Design along General TRIZ Process
by Misunderstanding Case ListMasao Ishihama (Kanagawa Institute of Technology, Japan)
The 6th Japan TRIZ Symposium 2010
Held by Japan TRIZ Society on Sept. 9-11, 2010
at Kanagawa Institute of Technology, Atsugi, Kanagawa, JapanAbstract
To improve noise and vibration (NVH) performance is important in such products as motor vehicles and home electrical appliances. To improve NVH and other performances simultaneously requires inventive design solutions. The author presented his study on the effective application method of TRIZ on NVH design at the 4th Japan TRIZ Symposium. The method has two new and major tools. One of them enables the user classify particular problems into seven standard NVH problems and the other provides more than 40 standard NVH solutions.
This paper discloses the results of study for improving this method further. The new feature is to place three kinds of knowledge bases (KB) in standard TRIZ process. The KBs prevent designers from side-tracking by showing negative examples. This method plays as a complement of normal TRIZ tools that attract people toward ideal directions.
Extended Abstract
To improve noise and vibration (NVH) performance is important in developing complex system products to be sold general customers as motor vehicles. In most cases, improving NVH performance and other performances are in trade-off relationships. For instance, if we increase stiffness of a car body, it tends to invite unnecessary weight increase and poor acceleration and fuel economy. Therefore, inventive design is required in this NVH engineering field.
The author has been trying to apply standard TRIZ process to NVH design. However, the author felt that to induce concrete design solutions in NVH field from the standard TRIZ solutions requests much experiences or strong insights that average engineers cannot have. Based on this observation, development of inventive NVH design process has been tried evolving from standard TRIZ process but maintaining its sprit. The developed process was partly reported in the 4th Japan TRIZ Symposium. In this process, seven categories are listed as the standard NVH problems, and more than 40 standard NVH solutions are prepared corresponding to them.
However, the author encountered some difficulties in applying the developed process in real NVH problem solving. Firstly, particular problems at hand were usually vaguely defined. To define particular problems clearly, experimental analysis must be properly conducted, and the exact phenomenon must be understood. However, wrong definitions of particular problems were frequently made by misunderstanding the principles of experimental analyses or the experiment result evaluations.
In the process of choosing standard solutions, misunderstandings of NVH design principles tended to lead to unrealizable solution selection. Further, in the process or finding a particular solution, the NVH performances of the solution must be predicted. If the designer misunderstands the principle of the CAE simulation, then miserable results would be obtained destroying all the precious TRIZ process.
To ease these difficulties, the author organized 70 cases of misunderstandings in three action phase, namely experimental analysis, design principle selection and performance prediction. These case descriptions are expected to guide designers along proper TRIZ track.
As shown in the figure 1, designers who improve NVH performances drastically can proceed to well defined particular problem using experimental analyses and their negative examples. To reach to the seven categories of standard NVH problems is relatively easy. By using negative examples of design selection, probability of choosing right standard NVH design from more than 40 options will be improved. Further, better qualitative performance prediction will help obtaining a right particular NVH solution.
Fig. 1 Improving TRIZ process for solving NVH problems by adding negative examples
The negative examples will be projected on a screen at the symposium, but only part of it will be printed in the proceedings.
Extended Abstract, PDF in English in Japanese
[2] Presentation Slides in PDF
[3] Introduction by Nakagawa:
Excerpt from:
Personal Report of
The Sixth TRIZ Symposium in Japan, 2010
Part D. Case Studies in Industries
Toru Nakagawa (Osaka Gakuin University)
Mar. 5, 2011 (Posted on Mar. 21, 2011)
Masao Ishihama (Kanagawa Institute of Technology) [J19, O-4] gave an Oral presentation with the title of "Guiding Noise and Vibration Design along General TRIZ Process by Misunderstanding Case List". Here is the Author's Abstract:
To improve noise and vibration (NVH) performance is important in such products as motor vehicles and home electrical appliances. To improve NVH and other performances simultaneously requires inventive design solutions. The author presented his study on the effective application method of TRIZ on NVH design at the 4th Japan TRIZ Symposium. The method has two new and major tools. One of them enables the user classify particular problems into seven standard NVH problems and the other provides more than 40 standard NVH solutions. This paper discloses the results of study for improving this method further. The new feature is to place three kinds of knowledge bases (KB) in standard TRIZ process. The KBs prevent designers from side-tracking by showing negative examples. This method plays as a complement of normal TRIZ tools that attract people toward ideal directions.
The Author's work presented at Japan TRIZ Symposium 2008 was later posted in this "TRIZ Home Page in Japan", see . The Author wants to discuss how TRIZ should be used effectively in the early stages of product development (see slide (below top-left)). The Author, as a specialist in the field of motor vehicles technology, he realizes the needs, opportunities, and benefits of applying TRIZ to such stages of product development, and yet finds possible risks in the TRIZ application. In the 5 slides (below) he summarizes his findings.
For addressing the Noise & Vibration (NVH) problems in motor vehicles, the Author built a guideline and knowledge bases of applying TRIZ (in a positive way) two years ago, as shown in the slide (below-left) which is taken from his 2008 presentation. However, for guiding engineers correctly by preventing from mistakes in the development process, the Author has found it useful to show them negative examples. Thus he built up Knowledge bases of misunderstanding in 3 stages. The slide (below-right) shows his new scheme of applying TRIZ in the NVH field especially complemented with the Knowledge bases of misunderstanding for avoiding from mistakes. He classified the NVH misunderstandings KB according to three phases of usage, i.e., for experimental analysis, for design, and for performance.
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The slide (below) shows a part of his Misunderstandings Knowledge Base. About 70 items are listed in this scheme, he says.
In the presentation sides recorded in the Proceedings, the Author demonstrates 3 examples, as shown in the slides (right, below-left, and below-right). [*** This kind of work must be important to make a solid basis for applying TRIZ to common and prevailing problems in specific fields. Author's suggestions about possible risks in applying TRIZ should also be considered carefully.] |
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Last updated on Sept. 25, 2011. Access point: Editor: nakagawa@ogu.ac.jp