TRIZ Paper: Japan TRIZ Symposium 2010
Held by Japan TRIZ Society on Sept. 9-11, 2010 at Kanagawa Institute of Technology, Atsugi, Kanagawa, Japan
| TRIZ Paper: Japan TRIZ Symposium 2010 |
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| Concept Design of a Child-Seat by TRIZ Style Problem Identification (Second Report) | |
| Minami Hamada (Kanagawa Institute of Technology) | |
| 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), Apr. 2, 2011 | |
| Posted: Sept. 25, 2010 |
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Editor's Note (Toru Nakagawa, Sept. 22, 2011)
This paper was presented last year by Minami Hamada, 2nd year graduate student for Masters Degree, in an Poster 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.
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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) )
Presentation (Poster Introduction) slides in PDF (in this Web site) Presentation (Poster Introduction) slides in PDF (in this Web site)
Presentation (Poster) slides in PDF (in this Web site)Nakagawa's Introduction (Excerpt of "Personal Report") -- The Author's previous idea of 'swing child seat on a spherical swivel' had a problem of no control and no damping of motion. Using TRIZ tools she found solutions of introducing an oval swivel to suppress yaw motion and a magnet for damping with the Eddy current.
[1] Abstract
Concept Design of a Child-Seat by TRIZ Style Problem Identification
(Second Report)Minami Hamada (Kanagawa Institute of Technology)
The 6th Japan TRIZ Symposium 2010
Held by Japan TRIZ Society on Sept. 9-11, 2010
at Kanagawa Institute of Technology, Atsugi, Kanagawa, JapanAbstract
Only 50% of cars carrying children on Japanese roads are equipped with child seats. Behind this low penetration number, sits insufficient performances of conventional child seats. To solve this situation, the author has been studying child seats that can swing on a spherical surface to cope with deceleration in collision and to absorb vibration while allowing children move freely during stable cruising. This concept was reported in the 5th Japan TRIZ Symposium.
However, a problem was remain unsolved at that time, i.e., rocking vibration continues after a shock due to the lack of a damping mechanism. To invent a damping mechanism without any adverse effects, contradiction matrix was used first. Then, substance - field analysis was conducted. Introduction of a new "field" in a system came to the author’s mind. From here, the author searched physical principle that can act as damping but not utilized yet. Electro-magnetic induction that generates eddy current seemed to be the solution. From this, analogy was taken to find realizable mechanism in different industry field. The study is in the stage of embodiment design at this moment.
Extended Abstract
Fig.1 Substance-field analysis
Fig.2 Prototype with vibration damping mechanism
Extended Abstract, PDF in English
[2] Presentation Slides in PDF
Presentation (Poster Introduction) Slides in English in PDF (4 slides, 216 KB)
Presentation (Poster Introduction) Slides in Japanese in PDF (4 slides, 444 KB)
Presentation (Poster) Slides in Japanese in PDF (12 slides, 1.0 MB)
[3] Introduction by Nakagawa:
Excerpt from:
Personal Report of
The Sixth TRIZ Symposium in Japan, 2010
Part F. Usage of TRIZ in Education and in Academia
Toru Nakagawa (Osaka Gakuin University)
Mar. 18, 2011 (Posted on Apr. 2, 2011)
Minami Hamada (Kanagawa Institute of Technology) [J20, P-A4] gave a Poster presentation with the title of "Concept Design of a Child-Seat by TRIZ Style Problem Identification (Second Report)". The Author is a 2nd year graduate student for Master's Degree. Last year she and Professor M. Ishihama gave an attractive presentation
Only 50% of cars carrying children on Japanese roads are equipped with child seats. Behind this low penetration number, sits insufficient performances of conventional child seats. To solve this situation, the author has been studying child seats that can swing on a spherical surface to cope with deceleration in collision and to absorb vibration while allowing children move freely during stable cruising. This concept was reported in the 5th Japan TRIZ Symposium. However, a problem was remain unsolved at that time, i.e., rocking vibration continues after a shock due to the lack of a damping mechanism. To invent a damping mechanism without any adverse effects, contradiction matrix was used first. Then, substance - field analysis was conducted. Introduction of a new "field" in a system came to the author’s mind. From here, the author searched physical principle that can act as damping but not utilized yet. Electro-magnetic induction that generates eddy current seemed to be the solution. From this, analogy was taken to find realizable mechanism in different industry field. The study is in the stage of embodiment design at this moment.
[*** The presentation has 16 Poster slides in Japanese and only 4 slides in English used in the Poster Introduction Session. Since the 4 English slides are very well organized to contain the essence of presentation, I am going to use them alone here. ]
The slide (right) introduces the Author's previous work presented last year. She wanted to improve the conventional design of child seats for vehicles, for making it more comfortable, convenient, and safe. Problems in the conventional design are written in the left side, while the new concept she proposed last year is written in the right side. The main feature of the proposed concept is the swinging motion of the child seat which is set on a spherical swivel. In case of accident, the seat makes a pendulum motion (with the help of triggering by the collision detection signal) to counter the lateral shock. Four metal balls between the lower and upper spherical bowls make the motion smooth, by rolling along the ditches. Side guards may pop-up after setting the child on the seat. The idea, however, was incomplete, the Author says. |
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As you see in the slide (right), the Author recognized two main problems unsolved. The first problem is that rolling or pitching oscillation lingers for a certain time after a shock, because no damping mechanism is installed yet. Ideal Final Results for this aspect is to have suitable amount of damping of the motion. The second problem is that the seat does not follows the vehicle's orientation change because the swivel is spherical and has no mechanism of directing the seat toward the vehicles direction. The IFR for this is to keep the child seat always look forward. |
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The Author carried out functional analysis, Substance-Field Analysis, Contradiction Matrix method, etc. The slide (right) shows the result of the Substance-Field analysis (in a wider sense). Functional relationships among the components of the child seat, child, car body, etc. are written. The blue arrows represent useful functions, while the red ones harmful functions. Excitation from road surface gives vibration to the car body structure, and to the upper components of the child seat. The rolling balls allow the pendulum motion of the upper swivel bowl, but have the harms of lingering the oscillation. The Author considers the Fields applicable in this part. Besides the mechanical fields of gravity and inertia force, the Author wanted to use some other field to control the unwanted effects. [*** Considering the applicable fields, instead of the triad representation, may be regarded as the essence of the Substance-Field analysis. This is the Author's understanding, and I agree with her.] |
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The slide (right) shows the results of idea generation. She used the Contradiction Matrix and obtained suggestions of several Inventive Principles. She selected the Principle 'Increase dimension' and obtained the solution as shown in the slide. The IFR for this case is, in terms of the degree of freedom, 'free pitch motion, free roll motion, but no yaw motion (i.e., rotation around the vertical axis)'. In the original spherical bowl design, the curvature was constant in the pitch and roll directions. In the new improved design, the pitch curvature is chosen different from the roll curvature. In this manner the yaw motion of the child seat is suppressed. Even though not shown in the last slide, the Author also proposed to introduced a damping mechanism by using the Eddy current of moving metal seat in the magnetic field. [*** This is a nice case study of concept generation by a graduate student. Thinking process is well explained.] |
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| Top of this page | Abstract | Presentation (Poster Introducton) Slides in PDF |
Presentation (Poster Introduction) slides in Japanese |
Presentation (Poster) slides in Japanese |
Nakagawa's Introduction (Excerpt from Personal Report) | Nakagawa's Personal Report of Japan TRIZ Symp. 2010 |
Japan TRIZ Symp. 2010 |
Japanese page |
Last updated on Sept. 25, 2011. Access point: Editor: nakagawa@ogu.ac.jp
