“ Why Water Striders can stand and slide on the Water? ” A Summer Homework by Son and Father with TRIZ Taichiro Miyanishi (2nd Grader, Kenroku Junior High School／Son)
○ Katsuya Miyanishi ( ／Father) English brushing up supported by Toru Nakagawa (OGU) (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
2008/09/10 Slide 1
We are from KANAZAWA. Intro.
FATHER Katsuya
Plan
Kanazawa
SON Taichiro
Hypothese
○○○○○
2nd Grader, Kenroku Junior High School
We are here now.
Comfirm
Proto types
Fa End ther
Nagamachi
Higashiyama
(C) The Author & Japan TRIZ Society
Kanazawa Castle
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Kenroku-en Garden Slide 2
Background Intro.
Last summer・・・
Plan Hypothese
○○○○○
Son
Comfirm
1st Grader, Junior High
"Why the water striders can stand and slide on the surface of water? I want to study about it as my summer homework."
Proto types
Good! But if you only survey about it in books and write a report without creativity, you would be Father just like an elementary school child.
Fa End ther (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 3
Purpose Intro. Plan Hypothese
○○○○○
“Why the water striders can stand and slide on the surface of water?”
Comfirm
Proto types
Fa End ther
– Let's set up hypotheses, and verify them! – Let's make conceptual prototypes ! (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 4
Approach Intro. Plan
Let's use TRIZ-thinking
Hypothese
○○○○○
in practice Planning Planning
Comfirm
Think independently
Set Set up up hypotheses hypotheses
Proto types
Verification Verification
survey here
Fa End ther
Make Make aa prototype prototype (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 5
Approach Intro.
Planning Planning
Plan
Let's use TRIZ-thinking
Purpose,Target, Evaluation standard Output, Schedule, etc.
Comfirm
Practice Practice
Hypothese
○○○○○
in practice
Set Set up up hypotheses hypotheses Search for mechanisms Grouping, Make a TREE Enhancing ideas Analysis, Select Candidates Make ideas for hypotheses
NAZE-NAZE deployment Affinity diagramming Scene deployment, MECE Strength/weakness analysis Evaluation, Combine
Proto types
Fa End ther
Verification Verificationof ofour ourideas ideas
Product Analysis
Experiments Experiments （Prototypes （Prototypes））
SFR
TRIZ TRIZCheck Check (C) The Author & Japan TRIZ Society
Physical Contradiction Centric Causal Analysis
（ Larry Ball @ The 3rd TRIZ Symposium in JAPAN）
Reverse TRIZ 4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 6
Management
（ Purpose,Target, Output, Schedule）
Intro.
Overview the Ideal（Goal, Outputs）, First!
Plan
Purpose
Hypothese
○○○○○
(Main) Set up the hypothesis Why the water striders can stand and slide on the surface of water? （Sub） Making conceptual prototypes
Schedule
Process Wants, Purpose, Target NAZE-NAZE deployment
Reports A4-Size 20-pages
Own hypothesis Survey
Comfirm
Target
Output Image
Confirmation and consideration
Use Clearfiles
Prototypes
Search for similar principles
Proto types
Making conceptual prototypes (Size of 5-6cm) by free and familiar materials
Fa End ther
The prototype must float in the same principle. (Not necessary to slide) Complete theme by August 20.
(C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
→ Free and familiar materials → Collect resources for prototypes Sketch the design of prototypes
Consideration of experiment result
Making prototypes
Improvement and Re-experiment
Experiment
Summary and Impression
Sept. 10-12, 2008
Slide 7
Search for mechanisms Intro.
NAZE-NAZE deployment (Root-cause analysis)
Plan
How How to to Stand Stand on on Water? Water?
How How to to Slide Slide on on Water? Water?
Hypothese
●○○○○
Comfirm
First、 Search for many many causes!
Proto types
・No particular about the water strider. ・Regardless of the concept size. ・Write on the Tag-Paper immediately. ・Mother and younger brother also joined part.
Fa End ther (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 8
Grouping, and Make a Logic-Tree Intro.
NAZE-NAZE deployment (Root-cause analysis)
Plan
・ Affinity diagramming ・ Make a Logic-Tree
Hypothese
○●○○○
Comfirm
How How to to Stand Stand on on Water? Water?
How How to to Slide Slide on on Water? Water?
Upper concept
Upper concept
Lower concept
Row on the water
Grouping
Lighter things inside the body
Lower concept Grouping Air in the legs
Proto types
Row by legs
Very light Air inside Like a propeller
Fa End ther
Light liquid inside Gas inside
(C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Fin on the legs
Sept. 10-12, 2008
Slide 9
Enhancing ideas by Associative thinking Intro. Plan
lighter things inside
Airship
Hypothese
○○●○○
associate
Balloon
Example Jet balloon associate
Enhancing by Associtive thinking Slide by any jet pressure
Comfirm
Lower concept （Another concept）
Proto types
Upper concept
Water pressure
Fa End ther
Stand
Slide
using gas pressure
using gas pressure
（＠KOSHIEN Stadium）
Jet balloon associate
(C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 10
Imagination of waterside-scene Intro.
Enhancing ideas by Scene deployment.
Plan
Imagining scenes and actions in daily life gives us new awareness.
Comfirm
Imagination
Hypothese
○○●○○
Fa End ther
Change into ideas
Proto types
Example-１
Example-2
Example-3
Water chopping
Remora
Ice skating
Jump on the water surface.
Ride on other one.
(C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide by freezing water by the foot. Slide 11
Strength／weakness analysis Intro.
Objective analysis of each cause.
Plan
How to Stand and Slide on the water?
Comfirm
Use surface tension Wide & thin foot
Helicopter Bamboo dragonfly Coin on water
Proto types
Freezing water Ride on lotus leaf
Fa End ther
Ride on animals
Remora
Ride on oil film 4th Japan TRIZ Symposium 2008
abundant water
Red Tags Keep jet
Easy to balance
Not easy to balance Easy to caught
Easy to balance
Fall down if melt
Not do anything by yourself
Not always desired direction
Blue Tags Sept. 10-12, 2008
・ ・ ・
・ ・ ・
Propeller
(C) The Author & Japan TRIZ Society
Strength Weakness
Water jet from toe Water jet from hole
Ride on other one
Application ・ ・ ・
・ ・ ・
Hypothese
○○○●○
(Continued)
・ ・ ・ ・ ・ ・ ・
NAZE-NAZE deployment
Strength / weakness analysis
Slip easily Slide 12
Select candidate ideas for hypotheses Intro.
Necessary conditions for water strider
Plan
Light weight
Hypothese
○○○●○
Best two ideas to “stand” on water.
Simple
Free move Free rotation
Select best ideas by the perspective view of analysis.
Comfirm
Best two ideas to “slide” on water.
Voting slip
Proto types
Fa End ther
Combine idea with another (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 13
Completion of hypotheses Intro.
How How to to Stand Stand on on Water? Water?
How How to to Slide Slide on on Water? Water?
Plan
Hypothese
○○○○●
Fine hairs of the foot repel water.
Legs row water.
Comfirm
Proto types
Fa End ther
Hole of the body jets air.
Oil repels water, also. (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 14
Confirmation of real facts Intro. Plan
Surveyed books and references in the library for the known facts. How How to to Stand Stand on on Water? Water?
○○○○○
Hypothese
・Fine hairs are on the feet.
How How to to Slide Slide on on Water? Water? ・Middle legs row the water like oars.
・Oil comes out of the feet, also. ・ Very light weight (40mg)
Comfirm
・Therefore, surface tension can hold the weight..
Proto types
・Middle legs row
Fa End ther
the water backward. fingernail
・The hairs hide the fingernail. (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 15
Confirmation of own hypothesis Intro.
How How to to Stand Stand on on Water? Water?
How How to to Slide Slide on on Water? Water?
Plan Hypothese
○○○○○
Fine hairs of the feet repel water.
Legs row water.
Comfirm
Proto types
Fa End ther
Hole of the body jets air.
Oil repels water, also. (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 16
Whole of NAZE-NAZE deployment map Intro.
Necessary condition for water strider
Plan
Strength/weakness analysis Strength
Hypothese
○○○○○
Means to Stand on Water
Weakness
Application examples
Best hypothesis Selected and its reason Voting slip
Comfirm
NAZE-NAZE deployment
Whole of MAP
Proto types
Confirmation of true cause True cause
Fa End ther
Confirmation of own hypothesis
Means to Slide on Water
Correct Incorrect
(C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 17
Deep understanding of the mechanism Intro.
We performed "Product Analysis”.
make to stand make to stand
Plan
hold
generate
Light weight
body
make to sink
Buoyancy on water
generate
Water ○○○○○
Hypothese
shed
Leg
have
on surface of the water
Fine hair
no destroy
Surface tension
generate
shed come out
Oil
Force to defy gravity
no destroy
Comfirm
hide
Proto types
row have
Nail
generate
Frictional force
generate
move
driving foce on surface of water
Fa End ther
make to stand
Product analysis of water strider (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 18
Collect resources for prototypes Intro. Plan
Collect free and familiar resources (materials). Decided by voting. Materials obtainable free and easily (in our house). Obtainable but not easy to use. Vote by TAICHIRO（Son） Vote by KATSUYA（Father）
Materials
Requirement Hypothese
○○○○○
Comfirm
Proto types Fa End ther
Styrene foam
Cotton
Paper
Straw
Stalk of Statice
Balsa
Vinyl
Sponge
Aluminum foil
Lace
for surface tension
shuttle
Mogol
Tooth brush
Duster
Corn
Setaria
Fine hair
Hair of peach
Parakeet's shuttlecock
Wool
Stuffed animal
Shuttlecock
Brush
for surface tension
Waterproof
spray
Meat tray
Fluorine
Mogol
Lead
Hair of brush
Straw
Cut straw Stalk of Brush
Light weight
Body
Leaf of morning-glory
Brush for glass
Oil Light & strong
Legs
(C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Leaf of pine Fine wire Sept. 10-12, 2008
Slide 19
Designing conceptual prototypes Intro.
Sketch the design of prototypes.
Plan
Son
Hypothese
○○○○○
Body Leg
Father
Styrene foam Mogol
Hair
Mogol
Oil
Waterproof
Body Leg
Balsa
Hair
Stalk of Brush
Oil
Hair of brush Waterproof
spray
Comfirm
spray
1st prototype
Proto types
Balsa
2nd prototype
Lead
Fa End ther
Setaria Waterproof
spray
(C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 20
Experiment！ Stand on Water？ Intro.
Son Won！
Plan
Son
Father
Hypothese
○○○○○
Comfirm
Proto types Fa End ther
Stand well
※ 2nd idea was abandoned,because fixation was difficult. (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Stand so-so
Sept. 10-12, 2008
Slide 21
Confirmation by spiteful experiments Intro.
Working on the real principle ?
Plan
Q）
Q）
Without the fine hairs, the model water strider cannot stand on water?
Does it sink when the surface tension is reduced?
Hypothese
○○○○○
Liquid detergent
Comfirm
Proto types Fa End ther
Right (C) The Author & Japan TRIZ Society
Without hairs this model cannot stand on water. 4th Japan TRIZ Symposium 2008
Right
Sept. 10-12, 2008
It sinks. Slide 22
Proposed by Mr.Larry Ball (Honetwell, USA)
Intro.
Causal Analysis with Larry Ball's Method. A new condition "Good water" was recognized.
Plan
（1）Causal analysis
Hypothese
○○○○○
Not good at standing ＝ｆ on water
Good at standing
Area of the foot is
Aarea of the foot is
Small
Big
Weight (specific density) is
Weight (specific density) is
deteriorating (area) of ＝ Volume the body is
cause
Stand on the surface. （Not Float）
Big. Weight is very light. （40mg）
Light
Heavy Comfirm
Proto types
Technical contradiction
（2）Real
Structure of the foot is
Water-repelling is
Water-repelling is
Low
High
Complex
Surface tension of water is
Surface tension of water is
Water is
Weak
Strong
＝
＝
Fa ther End
Physical contradiction
Clean (pure)
Have thin hairs Oil is secreted. Live in a clear water.
(New)
（ref.） ｢Hierarchal TRIZ Algorithms｣ Larry Ball (Honetwell, USA), The 3rd TRIZ Symposium in JAPAN 2007 doc. P.77
(C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 23
Modeling of problem for Reverse-TRIZ Intro.
Model-1 （Stand）
The foot is enlarged, and used as a float. X：Useful material introduction
Plan
Be made to stand with stability.
Small foot
（insufficient）
on surface of the water
Leg
Hypothese
○○○○○
Body
（disturb）
Change to huge
Comfirm
Model-2 （Slide）
The nail or fin of the foot rows water.
Be made to move horizontally.
Proto types
Small nail
Fa ther End (C) The Author & Japan TRIZ Society
Leg
（insufficient）
（disturb）
Destroy 4th Japan TRIZ Symposium 2008
X：Useful material introduction
on surface of the water
Surface tension Sept. 10-12, 2008
Slide 24
Reverse-TRIZ
Why Water Striders can “stand” on the water? Intro.
【Wish】
To stand on the water by foot with stability.
【Easy Approach】
The foot is enlarged, and used as a float.
ＥＣ２
Plan
ＥＣ１ Worsening
Improving
Not possible to float with stability on water.
possible to float with stability on water.
Foot becomes huge.
27
27
7
Improving Hypothese
○○○○○
Foot and body can be reduced.
7
Volume of moving object
Comfirm
14.
Spheroidality-Curvature
1.
Segmentation
Reliability
Reliability
3.
Foot-structure is subdivided into hair level.
Proto types
40. Composite materials Has Hairs at the front part of foot. 複合材料原理
Fa ther End
11. Beforehand cushioning Oil複合材料原理 is secreted from the hair.
Worsening
Volume of moving object
Local Quality Foot has Fine hairs at the part that touches water.
24.
Intermediary
To prevent the foot from destroying the surface tension of water, Hair and Oil, and Air between the foot and water are used.
Actual 'principle for standing' can be derived from TRIZ.
(C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 25
Reverse-TRIZ
Why Water Striders can “slide” on the water? Intro.
【Wish】
To slide on the water by foot.
【Easy Approach】
The nail or fin of the foot rows water.
ＥＣ２
Plan
ＥＣ１ Improving
Hypothese
○○○○○
Surface tension is not destroyed.
Worsening Can’t advance well.
Comfirm
11
Stress or pressure
19.
Periodic Action
15
Duration action of moving object
Inside foot is lacked and advances as Oar.
Improving Can advance well.
15
Duration action of moving object
Worsening Surface tensity is destroyed.
11
Stress or pressure
27. Cheap short-living objects 複合材料原理
????
Local Quality “Nail” hidden in hair doesn't destroy the 複合材料原理
Proto types
3.
Unknown
surface tension and water is rowed.
Fa ther End
What does this 3rd principle mean?
(C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 26
Reverse-TRIZ Intro.
Why Water Striders can “slide” on the water? MIT had clarified my mystery of 3rd principle. （Massachusetts Institute of Technology）
Plan
http://web.mit.edu/newsoffice/2003/robostrider.html
（Excerpt from right record homepage）
Hypothese
○○○○○
As the insect rests on the surface, the tips of its thin legs create miniscule valleys. It sculls the middle set of its three pairs of legs like oars, causing the water behind those legs to propel it forward as the surface of the valley rebounds like a trampoline.
Comfirm
New awareness
Proto types
27. Cheap short-living objects 複合材料原理 The miniscule valley of water is used.
Fa ther End
’Sliding principle' can be proven from TRIZ, also.
(C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 27
Summary of study Intro. Plan
“Why the water striders can stand and slide on the surface of water?”
Hypothese
○○○○○
We solved this mystery by using TRIZ-thinking. Planning Planning
Comfirm
Set Setup uphypotheses hypotheses
Proto types
Verification Verification
Think independently
survey here
Make Makeprototypes prototypes
Fa End ther
Nature and living thing teach us many good ideas. All principles have been proven by TRIZ. (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 28
Son's and father's comments ・・!? Intro. Plan
Due to "NO criticisms", I could learn things from father much more gently than usual.
Hypothese
○○○○○
I could do my homework by using a state-of-the-art technique. And, I won A FineWork-Prize from Kanazawa Kid's Science Center .
I can report son’s outputs, today. I can say to my co-workers, "Even junior high school students can utilize “TRIZ” if they find a problem".
Comfirm
Proto types
Fa End ther (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 29
Conclusion and Proposal Intro. Plan
TRIZ can be used for everything if you find a problem.
Hypothese
○○○○○
Let's use it more flexibly, freely and actively.
Comfirm
Curiosity Inquiring mind Try to think!
Proto types
Fa End ther
Make TRIZ familiar for childlen and teens. (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 30
TAICHIRO (Top author)‘s greeting Intro. Plan Hypothese
○○○○○
Comfirm
Proto types
Fa End ther (C) The Author & Japan TRIZ Society
4th Japan TRIZ Symposium 2008
Sept. 10-12, 2008
Slide 31
