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Functional Analysis Functional Analysis (Decomposition) helps with
Breaking down complex processes Organizing main requirements Creating alternative solutions Making decisions explicit Expanding or contracting problem scope Facilitates teamwork
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Functional Decomposition
Start with the most important function Identify the system boundary Show material, energy, and signals Transport 8z of water between two cups Water in Cup A Water in Cup B
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Functional Decomposition
Format of box contents: Verb – noun – modifier “Transfer” “water” “between cups” Electrical energy Kinetic energy of air molecules Convert wind energy to electricity Air molecules Air molecules
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Typical Functions Absorb Actuate Amplify Assemble
Change Channel Clear Collect Conduct Control Convert Couple Direct Dissipate Drive Hold Increase Interrupt Join Lift Limit Locate Move Orient Position Protect Release Rectify Rotate Secure Shield Start/Stop Steer Store Supply Support Transform Translate Verify
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Functional Analysis Example : A Personal coffee-maker Make coffee
Ground Coffee Make coffee Coffee in mug Cold Water System Boundary
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Functional Analysis Water Coffee Heat Water Mix coffee & water
Transport into mug Filter Coffee Energy Used coffee
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Functional Analysis Coffee Used coffee Mechanical Energy
Mix coffee & water Filter Coffee Hold Water Transport into mug Hot Water Filter after mixing Keep coffee contained Lifting & pouring Gravity dripping Small pot Coffee mug Water thru coffee Coffee thru water Free mixing
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Functional Decomposition
Nut Cracker nut De-shell nut Un-cracked Nut Hand energy Vaporize shell Crush and sift Crack shell Shell
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Functional Decomposition
nut Shell Hand energy nut Increase mechanical advantage Un-cracked nut Control stroke Secure nut Lever action Four-bar linkage Slider-crank linkage Power screw Cam mechanism Mechanical stop Limited motion Chamber Friction Groove
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Functional Decomposition Computer Mouse
Allow easy sliding of the mouse Convert user energy into screen position signal Convert mouse movements into internal movements Verify pick selection Convert user energy into selection signal Fit user hands ergonomically Support user’s arm Convert internal movements into electronic signal Convert user arm or finger movements into pick signals
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Functional Decomposition
Functional decomposition can proceed after some decisions are made. Water in A Water in B Remove Measure Transfer Deposit Trigger signal
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Functional Decomposition
The choices regarding remove are: Using no containers Using one container Using multiple containers Using pump action The team chooses “one container”, the Functional decomposition proceeds: “Fill container”, “Lift container”, etc.
