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Function Analysis

Function Analysis. Procedure for Function Analysis What has to be achieved by a new design Not on How it is to be achieved 1. Express the Overall Function in terms of conversion of inputs to outputs. Black Box 2. Break down the Overall Function into a Set of Essential Sub-Functions.

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Function Analysis

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  1. Function Analysis • Procedure for Function Analysis • What has to be achieved by a new design • Not on How it is to be achieved 1. Express the Overall Function in terms of conversion of inputs to outputs. • Black Box 2. Break down the Overall Function into a Set of Essential Sub-Functions. 3. Draw a Block Diagram showing Interactions of Sub-Functions. 4. Draw System Boundary • Functional Limits for Product to be designed • Could be Narrowed in order to Define Feasible Product 5. Search for Appropriate Components to Perform Sub-Functions & Interactions.

  2. BLACK BOX Inputs FUNCTION Outputs • Procedure for Function Analysis • Express Overall Function • Black Box with Input & Output • As Broad as Possible Figure 1 Black Box System Model

  3. Overall Function Sub- Function Sub- Function Sub- Function Sub- Function ….. Figure 2 Break down Overall Function • Procedure for Function Analysis • Break down Overall Function • into a Set of Essential Sub-Functions • (Auxiliary Sub-Function) • Depends on Factors such as Kinds of Components Available for Specific Tasks

  4. TRANSPARENT BOX Sub- Function Sub- Function Inputs FUNCTION Sub- Function Sub- Function Figure 3 Transparent Box Model • Procedure for Function Analysis • Draw Block Diagram • Transparent Box • Showing Interactions between Sub-Functions • Some Sub-Functions can be Redefined • (Different Type of Lines is useful to Show Different Types of Input & Output) • Flows of Material, Energy, or Information

  5. BLACK BOX TRANSPARENT BOX Sub- Function Sub- Function Sub- Function Sub- Function • Procedure for Function Analysis Figure 4 Black Box & Transparent Box Model

  6. Procedure for Function Analysis • Draw System Boundary • Functional Limit • Precise Extent and Location of System Boundary • Narrowed in order to Define Feasible Product • Search for Appropriate Components • Depends on Nature of Product or Device to be Designed • (Human, Mechanical Part, or Electronic Device as Components)

  7. Figure 5 Existing Method of Filling, Storing and Dispatching Bags of Animal Feed • Example: Feed Delivery System

  8. Figure 6 Alternative Formulations of Feed Distribution Problem • Example: Feed Delivery System • Goal: Reduce Relative High Costs of Handling and Storing Feedstuffs • Overall Functions Broadened • F1. Transfer of Feed from Mixing Bin to Bags Stored in Warehouse • F2. Transfer of Feed from Mixing Bin to Bags Loaded on Truck • F3. Transfer of Feed from Mixing Bin to Consumers’ Storage Bin • F4. Transfer of Ingredients from Source to Consumers’ Storage Bin • Suggests Different Kinds of Solution

  9. Overall Function Loose carpet squares stamped out of the length Carpet squares packed in lots • Example: Packing Carpet Squares Figure 7 Analysis of Principle Functions for Packing of Carpet Squares

  10. Overall Function Loose carpet squares stamped out of the length Carpet squares parked in lots Stamp from length Separate Offcuts Check Quality Counts Squares Combine In Lots Pack Dispatch Material Notation: Material Flow Main Function System Boundary • Example: Packing Carpet Squares Figure 8 Analysis of Principle Functions for Packing of Carpet Squares

  11. Send Signal toCombine n Squaresinto One Lot Supply PackingMaterial Notation: Signal Flow Stamp from length Separate Offcuts Check Quality Counts Squares Combine In Lots Pack Dispatch Material Auxiliary Function Remove Offcuts Remove Rejects Material Flow Main Function System Boundary • Example: Packing Carpet Squares Figure 9 Expanded Function Analysis for Packing of Carpet Squares

  12. Cold water Hot tea Tea being BREWED (measured quantity) Tea leaves (measured quantity) Tea leaves (waste) • Example: Automatic Teamaker Figure 10 Expanded Function Analysis for Packing of Carpet Squares

  13. Cold water Hot tea Tea being BREWED Tea leaves Tea leaves (waste) Water Tea Water is heated Water and Tea United Tea is Infusing Tea and Waterare Separated (a) Energy Leaves Tea leaves Water Tea Water is heated Tea leaves are immersed (b) Energy Leaves Tea leaves Tea Tea leaves are wetted Water Water is heated Concentrate and water are united Tea (c) Energy Figure 11 Three Alternative Process Models for Tea Brewing • Example: Automatic Teamaker

  14. REGULATE the heating REGULATE the infusion Tea Heat the water UNITE tea and water ALLOW the infusion SEPARATE tea and leaves Leaves TRANSFORM energy to heat ACTIVATE the separation SUPPORT subsystem Energy (electrical) • Example: Automatic Teamaker Figure 14 Function Analysis for Automatic Teamaker

  15. Clean clothes Soiled clothes Washer Dirt Inputs Function Outputs • Example: Washing Machine Figure 15 Black Box Model of Washing Machine

  16. Notation: Simple Washing Machine Conventional Modern Washing Machine Future Washer-Dryer-Presser Washer-Dryer • Example: Washing Machine Dirty water SoiledClothes Loosen dirt (add water and detergent) Separate dirt (agitate) Remove dirt (rinse) Clean Clothes Water Water Water Detergent Figure 16 Function Analysis of Washing Machine

  17. Notation: Simple Washing Machine Conventional Modern Washing Machine Future Washer-Dryer-Presser Washer-Dryer • Example: Washing Machine Dirty water Water SoiledClothes Loosen dirt (add water and detergent) Separate dirt (agitate) Remove dirt (rinse) Remove water (spin) Clean Clothes Water Water Water Detergent Figure 16 Function Analysis of Washing Machine

  18. Notation: Simple Washing Machine Conventional Modern Washing Machine Future Washer-Dryer-Presser Washer-Dryer • Example: Washing Machine Dirty water Water Moist air SoiledClothes Loosen dirt (add water and detergent) Separate dirt (agitate) Remove dirt (rinse) Remove water (spin) Dry clothes (tumble) Clean Clothes Water Water Hot air Detergent Figure 16 Function Analysis of Washing Machine

  19. Dirty water Water Moist air SoiledClothes Loosen dirt (add water and detergent) Separate dirt (agitate) Remove dirt (rinse) Remove water (spin) Dry clothes (tumble) Smooth clothes (press) CleanClothes Water Water Hot air Detergent Notation: Simple Washing Machine Conventional Modern Washing Machine Future Washer-Dryer-Presser Washer-Dryer • Example: Washing Machine Figure 16 Function Analysis of Washing Machine

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