Mutual Compensation of TRIZ and Axiomatic Design and

Mutual Compensation of TRIZ and Axiomatic Design and their application to Ecodesign 안영준 0

TRIZ (theory of inventive problem solving) ▪ Theory of Inventive Problem Thinking (Tеория Решения зобретбтельских Зада. H) ▪ Genrich Altshuller 5

TRIZ – Contradiction (1) ▪ Technical Contradiction - conflicts generates between 2 technical parameters Improve - Contradiction Matrix 40 Inventive Principles C A B A↑ → B↓ B↑ → A↓ 6

TRIZ – Contradiction (2) ▪ Physical Contradiction - 1 technical parameter has to be A, and not A simultaneously - Separation Principle Required Trade-Off 7

Axiomatic design ▪ MIT Nam P. Suh ▪ To establish theoretical base of mechanical design field ▪ useful for analyzing multi-functional system 8

Independent Axiom Coupled Uncoupled Independence of functional requirements must be always maintained How to achieve functional independence? 9

Design matrix (Uncoupled) ☞ best design (Decoupled) (Coupled) ☞ good design ☞ wrong design 10

Axiomatic Design for TRIZ 1. Is TRIZ suitable for analyzing complex system? - almost all tools in TRIZ are focusing two functions, properties, or objects 11

AD can manage multi-function system ( in Bill Separating Mechanism ) from Ref. 2 FR : Functional Requirement DP : Design Parameter 관심 대상 시스템의 기능, 그리고 이에 대응되는 설계 파라미터를 체크하고 둘 사이에 어떠한 연관성을 갖는지를 한 눈에 파악할 수 있음. 12

Combining TRIZ with AD Axiomatic Design from Ref. 1 Axiomatic Design Grouping case by case ! 13

TRIZ for Axiomatic Design 1. Axiomatic design with Physical Contradictions 2. Axiomatic design with Technical Contradictions 3. Axiomatic design with Su-Field, Effects 4. Axiomatic design with System Evolution 14

[AD and physical contradiction] from Ref. 2 FR : Functional Requirement DP : Design Parameter FR 1 : give the a forward force to the first bill FR 2 : give a backward force to the second bill FR 6 : decrease the forward force after one bill is gone DP 1 : upper roller DP 2 : lower roller DP 6 : cam contradiction 15

FR : Functional Requirement DP : Design Parameter FRs and DPs matches with 1: 1 Simplified design 16

[AD and technical contradiction] from Ref. 3 1. Designers hope to increase the productivity by increasing the speed, but the centrifugal force makes the pulp deviate from the wire. 2. Designers want to increase the productivity by increasing the speed, but the dryer doesn’t meet the demand. To meet the demand, dryer should be large and complex system. 17

1. Increase productivity, speed ↔ loss of substances (pulp deviate from the wire) principle # 10 : preliminary action # 28 : mechanical substitution Counteract centrifugal force - Vacuumizing inside of wire - Pressure outside of wire - Put particles which is active with electromagnetic field in pulp 2. Increase productivity, speed ↔ complexity of equipment (attach big dryer) # 10 : preliminary action # 34 : discarding and recovering Preliminary dryer - Infrared, through-air dryer Enhance heat conductance - Coat material to dryer 18

[AD and Su-Field analysis] from Ref. 4 19

[Technical Evolution ] TMA (Thin-film Micro Array ) ▪ FR 1 : light reflection ▪ FR 2 : mirror tilting ▪ DP 1 : cantilever top surface ▪ DP 2 : cantilever sandwich Increase controllability Evolve coupled to uncoupled design 20

Ecodesign 사례 36

1. Vacuum cleaner (AD with TC) 1. 1 LCA of vacuum cleaner with filter : 환경적으로 가장 취약한 단계 파악 Improve eco-efficiency in product use stage 37

1. 3 Axiomatic Design (vacuum cleaner with filter) improve suction force X X X motor collect sucked dust O X O dust bag O O X filter protect motor from dust = decoupled design 현재 설계를 개선하려면, 먼지 봉투와 필터가 흡입력에 미치는 영향을 최소화시켜야 함. Improve decoupled design to uncoupled design 39

2. Toilet stool (AD with PC) protect bad smell discharge excrement X X = X X fixed trap coupled design water Waste water too much in product use stage. 44

protect bad smell discharge excrement X X = O X flexible trap water decoupled design Reduce water usage 13 L to 3 L in product use stage. Design was enhanced by separation principle. 45

3. Water faucet (AD with Effect) valve on / off sensing provide electricity = X O X valve O X X sensor O O X battery It is decoupled design, but if battery is dead the system becomes coupled. For the environment and maintenance, battery (DP 3) should be replaced with another system such as a self-power system. 46

Effect database for searching another DP. Key word : “generate electric energy” (resorce constraint : liquid substances) 47

Effect database for searching another DP. Key word : “generate electric energy” (resorce constraint : liquid substances) 48

http: //www. toto. co. jp/en/products /public/p 00003/index. htm valve on / off sensing provide electricity = X O X valve O X X sensor O O X generator It is decoupled design, environmental friendly, and easy to maintain 49

두께가 얇으면 축 변형이 일어남 heat the paper X X O stand upper pressure = O X O stand lower pressure O O X heat lamp thickness (fuser roller) thickness (pressure roller) 51

fuser roller의 두께를 1/10배로 줄임으로써 에너지 문제 해결 heat the paper X O stand upper pressure = stand lower pressure O heat lamp O X O inner roller O O X outer roller 거의 0에 근접 53

부록 (Axiomatic Design for TRIZ) 2. Some Administrative contradictions could be solved by Axiomatic design - some complexity of the system can be solved by design matrix. 56

Q = A 11 * Pump speed T = A 21 * Pump speed + A 22 * Screw speed Pump speed must be fixed first. Then, temperature can be controlled by screw speed. If sequence of fixing DP is different, engineer can feel complexity, or administrative contradiction, especially multi-function system. 57