上海交通大学：《Systems Engineering 系统工程》课程教学资源（电子讲义）Lecture6 Tradespace Exploration and Concept Selection

JIAOTONG UNIVERSITY 196 Systems Engineering Lecture 6 Tradespace Exploration and Concept Selection Instructor(s) Prof.Jianjun Gao Department of Automation School of Electronic Information and Electrical Engineering 2014 Spring

Systems Engineering Instructor(s) + - 2014 Spring Tradespace Exploration and Concept Selection Prof. Jianjun Gao Department of Automation School of Electronic Information and Electrical Engineering Lecture 6

Gao's V-Model Stakeholder Systems Engineering Lifecycle Analysis Overview Managment 入 Requirement Cost and Schedule Commissioning Analysis Management Operations System Verification and Architecture Validation Tradespace System Exploration Integration Human System Factor Design Definition and Safety Optimization CLGO System Engineering by J.J.Gao 2

+ - System Engineering by J. J. Gao 2 Gao’s V-Model Stakeholder Analysis Requirement Analysis System Architecture Tradespace Exploration Design Definition and Optimization System Integration Verification and Validation Commissioning Operations Lifecycle Managment Systems Engineering Overview Cost and Schedule Management Human Factor System Safety

Today's Agenda Concept Generation,Concept Selection Decision Making in Concept Selection Simple Methods:Pugh Matrix Multi-Attribute Utility Non-Dominance Relationship Tradespace Exploration Example: Space Tug CLGO System Engineering by J.J.Gao 3

+ - 3 Today’s Agenda  Concept Generation, Concept Selection  Decision Making in Concept Selection  Simple Methods: Pugh Matrix  Multi-Attribute Utility  Non-Dominance Relationship  Tradespace Exploration Example: Space Tug System Engineering by J. J. Gao

Conceptual Design Process Higher Level System Input Higher level input may include ↓ needs,constraints, I.Value Definition assumptions II.Concept Generation (Design space exploration) Concept generation involves divergent thought process III.Concept Selection (Narrow-down alternative set) Concept Selection involves IV.System Architecture Definition convergent thought process Detail design The early stages in the development process have great potential to improve the value delivered in the product and to reduce rework in the process.Generating and maturing design alternatives require resources and time,which are limited in a project.Therefore,there is need for efficient methods to manage alternatives that also allow maximization of design space exploration while considering the resources and time available. (David Diaz Dominguez,SDM 2011) CLGO System Engineering by J.J.Gao 4

+ - System Engineering by J. J. Gao 4 Conceptual Design Process  Higher level input may include needs, constraints, assumptions  Concept generation involves divergent thought process  Concept Selection involves convergent thought process I. Value Definition II. Concept Generation (Design space exploration) III. Concept Selection (Narrow-down alternative set) IV. System Architecture Definition Higher Level System Input Detail design The early stages in the development process have great potential to improve the value delivered in the product and to reduce rework in the process. Generating and maturing design alternatives require resources and time, which are limited in a project. Therefore, there is need for efficient methods to manage alternatives that also allow maximization of design space exploration while considering the resources and time available. (David Diaz Dominguez, SDM 2011)

System Architecture>Design Conceptual CDR Modeling Optimization “Optimal" metric 1 Design Decision Making Need Qualitative◆ Quantitative→ PDR 长X SRR Design Modeling m Optimization Concept Concept Concept System Synthesis Screening Selection Design variable X1 System Architecture System Design CLGO System Engineering by J.J.Gao 5

+ - System Engineering by J. J. Gao 5 Decision Making in System Design

Concept Generation Historical Roots Lull's Art C0N314r0我4， f言州 了4垂uC,t QuA 50L节 A B.C.D.E. F.G.H.t. K. O.Prrim. Ramon Lull (1235-1315)-a monk from Majorca constructed a logic machine' that performs automatic combinations of solutions Source:Prokopska,2001 CLGO System Engineering by J.J.Gao 6

+ - System Engineering by J. J. Gao 6 Concept Generation Historical Roots – Lull’s Art  Ramon Lull (1235-1315) – a monk from Majorca constructed a ‘logic machine’ that performs automatic combinations of solutions Source: Prokopska, 2001

Morphological Matrix for Concept Generation First introduced by Zwicky (1969)as a method to explore the potential solutions to a problem with multiple parameters Evolved into the method for generating and organizing solution alternatives known as morphological matrices □htp/un ction2.n Most Visted Getting Started Letest h Morphmatrix Starch Criteria Artifacts Search took:0.993 seconds. (16 】 型142 】 245 6少】 lotch releaie (2.03% Search took:0.909 seconds er (21.543 ang.(10 eders (515%) 0e42 Search took:1.005 seconds 1 Search took:0,982 secends, tgn吃e225的1 h52 本不1 Morphological chart generated using Oregon State University's Morphological Chart Search tool(Design Engineering Lab OSU,2010) System Engineering by J.J.Gao CLGO 7

+ - System Engineering by J. J. Gao 7 Morphological Matrix for Concept Generation  First introduced by Zwicky (1969) as a method to explore the potential solutions to a problem with multiple parameters  Evolved into the method for generating and organizing solution alternatives known as morphological matrices Morphological chart generated using Oregon State University´s Morphological Chart Search tool (Design Engineering Lab | OSU, 2010)

Morphological Matrix for Concept Generation Example:Suppose you want to design a folk lift truck. What is the solution? Function Possible Solution Supporting Wheel Steering Stopping Brake Moving Power Transmission Gears and Shaft Lifting Screw CLGO System Engineering by J.J.Gao ③ 8

+ - System Engineering by J. J. Gao 8 Morphological Matrix for Concept Generation Example: Suppose you want to design a folk lift truck. What is the solution? Function Possible Solution Supporting Wheel Steering Stopping Brake Moving Power Transmission Gears and Shaft Lifting Screw

Why Concept Selection Important Conceptual Design is a high leverage phase in system development 100% Management Leverage Cost Committed 66% Knowledge Cost Incurred Concept Detail Production Use Development Design CLGO System Engineering by J.J.Gao 9

+ - System Engineering by J. J. Gao 9 Why Concept Selection Important Conceptual Design is a high leverage phase in system development ~66%

Why Concept Selection Important Target:Design a Global communication systems There are many solutions OR Underground Cable Underwater Cable Concept #1 Concept #2 Wireless Wireline Communication via Communication Satellite CLGO System Engineering by J.J.Gao 10

+ - System Engineering by J. J. Gao 10 Why Concept Selection Important OR  Target: Design a Global communication systems  There are many solutions