Functional Analysis n Functional Analysis Decomposition helps with

Functional Analysis n Functional Analysis (Decomposition) helps with n n n Breaking down complex processes Organizing main requirements Creating alternative solutions Making decisions explicit Expanding or contracting problem scope Facilitates teamwork

Functional Decomposition n Start with the most important function Identify the system boundary Show material, energy, and signals Water in Cup A Transport 8 z of water between two cups Water in Cup B

Functional Decomposition n Format of box contents: n n Verb – noun – modifier “Transfer” “water” “between cups” Kinetic energy of air molecules Electrical energy Convert wind energy to electricity Air molecules

Typical Functions n n n n n Absorb Actuate Change Channel Conduct Control Direct Dissipate Increase Interrupt Limit Locate Position Protect Rotate Secure Steer Store Transform Amplify Clear Convert Drive Join Move Release Shield Supply Translate Assemble Collect Couple Hold Lift Orient Rectify Start/Stop Support Verify

Functional Analysis n Example : A Personal coffee-maker Ground Coffee Cold Water Make coffee Coffee in mug System Boundary

Functional Analysis Coffee Water Heat Water Mix coffee & water Transport into mug Filter Coffee Energy Used coffee

Functional Analysis Coffee Hold Water Mix coffee & water Used coffee Filter Coffee Mechanical Energy Transport into mug Hot Water Small pot Water thru coffee Coffee mug Coffee thru water Free mixing Filter after mixing Keep coffee contained Lifting & pouring Gravity dripping

Functional Decomposition n Nut Cracker Un-cracked Nut nut De-shell nut Hand energy Vaporize shell Crush and sift Crack shell Shell

Functional Decomposition nut Shell Hand energy Un-cracked nut Secure nut Increase mechanical advantage nut Control stroke Chamber Lever action Mechanical stop Friction Four-bar linkage Limited motion Groove Slider-crank linkage Power screw Cam mechanism

Functional Decomposition Computer Mouse Allow easy sliding of the mouse Verify pick selection Convert user energy into screen position signal Support user’s arm Convert user arm or finger movements into pick signals Convert mouse movements into internal movements Convert user energy into selection signal Fit user hands ergonomically Convert internal movements into electronic signal

Functional Decomposition n Functional decomposition can proceed after some decisions are made. Water in A Water in B Remove Trigger signal Measure Transfer Deposit

Functional Decomposition n The choices regarding remove are: n n n Using no containers one container multiple containers pump action The team chooses “one container”, the Functional decomposition proceeds: n “Fill container”, “Lift container”, etc.