上游充互大粤 SHANGHAI JIAO TONG UNIVERSITY Step 1:Clarify the Problem Understanding the problem Who is the customer? >What are the customer needs? ·Customer needs Preliminary product specification What are critical"sub-problems"? Problem decomposition Breaking the problem down into simpler subproblems Focusing on critical subproblems
Step 1: Clarify the Problem Understanding the problem Who is the customer? What are the customer needs? • Customer needs • Preliminary product specification What are critical “sub-problems”? Problem decomposition • Breaking the problem down into simpler subproblems Focusing on critical subproblems
上游充互大粤 SHANGHAI JIAO TONG UNIVERSITY Concept Generation Example:Power Nailer Customer needs The nailer inserts nails in rapid succession The nailer is lightweight SENCO The nailer has no noticeable nailing delay after tripping the tool The target product specifications Nail lengths from 25 mm to 38 mm Maximum nailing energy of 40 joules per nail Nailing forces of up to 2000 Newtons Peak nailing rate of one nail per second Average nailing rate of 12 nails per minute Tool mass less than 4 kilograms Maximum trigger delay of 0.25 second
Concept Generation Example: Power Nailer Customer needs • The nailer inserts nails in rapid succession • The nailer is lightweight • The nailer has no noticeable nailing delay after tripping the tool The target product specifications • Nail lengths from 25 mm to 38 mm • Maximum nailing energy of 40 joules per nail • Nailing forces of up to 2000 Newtons • Peak nailing rate of one nail per second • Average nailing rate of 12 nails per minute • Tool mass less than 4 kilograms • Maximum trigger delay of 0.25 second
上游充通大学 SHANGHAI JIAO TONG UNIVE Decomposition problems 1.To represent the problem as a NPUT OUTPUT single black box operating on Energy(?) Energy (? Material Hand-held Material (nails) Material(driven nail) > nailer Energy Signal (tool "trip")-- -Signal (? >Signal flows 2. Divide the single black box into subfunctions Store or Convert > Each subfunctions can Energy accept energy to extemal translational generally be further divided into energy energy even simpler subfunctions Apply Store Isolate ◆Dien > The division process is Nails translational nails nail energy to nail nail repeated until the team members agree that each "Trip"of Sense Trigger subfunction is simple enough to tool trip tool work with 3-10 subfunctions are recommended
Decomposition problems 1. To represent the problem as a single black box operating on Material Energy Signal flows 2. Divide the single black box into subfunctions Each subfunctions can generally be further divided into even simpler subfunctions The division process is repeated until the team members agree that each subfunction is simple enough to work with • 3-10 subfunctions are recommended