- No category
ME Design: Function Structure & Concept Generation
advertisement
MEE 4193: ME Design 1 Lecture - In the Context of Requirements List Develop Function Structure, Morphological Chart and then Generate and Critically Evaluate Concepts September 15, 2025 By Anand Balu Nellippallil Department of Mechanical and Civil Engineering Florida Institute of Technology Email: anellippallil@fit.edu Cell: 405-979-0894 0 Design problem 1 Form team 2 Plan the design process 0 Design problem 1 Form team The SHARK Project 2 Plan the design process 3 Understanding the customer/design requirements 4 Understand and develop product functions Team organization Overall design task 5 Generate concepts 6 Develop concepts 7 Develop product 8 Develop prototype Release documents Remove Offcuts Check Quality Count Tiles Supply Packing Material Combine in lots Pack Tiles Dispatch lot Whats Remove Rejects Function structure Units This Product How Muches Customer Evaluation Hows This Product Separ ate offcuts Hows vs Hows Now Now vs What Stamp Tiles from length Send Signal to combine n tiles into one lot 3 Understanding the customer/ design requirements Name 1 Name 2 Name 3 Who 4 Understand and develop product functions Who vs. Whats Design Process Project plan Whats vs Hows Hows vs How Muches Targets Requirement list 5 Generate concepts 6 Develop concepts Documentation of concepts Determine the Requirements List for designing, building and testing for your Project. Selected concept 7 Develop product 8 Develop prototype Product details Release documents 9/14/2025 2 2 Conceptual Design Conceptual design … is that part of the design process in which the Requirements List is transformed into a concept that satisfies functional feasibility and you can speculate about technical feasibility. 9/14/2025 3 3 Let`s Start with the Function Structure Step 1 Understanding Functions ❑A function is the operation that the product performs on a flow to transform input state to output state. ❑A flow is material, energy or signal (information) that is used by or affects the product. Source: http://npdbook.com/engineeringconcepts/function-structure-diagram/ O Energy make something happen Transferring electrical energy to heat O Information flow is a signal provided to device or data that device acts on On/off” switch provides a signal to a device O Material flow is any physical entity that the device transforms Coffee machine transforms ground coffee and water into coffee 9/14/2025 4 4 Function Structure Sketch three flows in the function structure Material The device Energy Power the device Information Control the device Boundary Represent material flow using verb-noun tuples Note: The Represent energy flow using verb-noun tuples three flows MUST interact Represent information flow using verb-noun tuples Identify what comes out from boundary. Oil Examples valued outcomes – oil and waste (e.g., noise, heat, etc.) 9/14/2025 5 5 Function Structure Step 2 Creating the Black Box Model ❑A Black Box Model consists of the overall function of the product, transforms the flows into the product and the flows out of the product. O Input flows would be compressed air, nails and trip signal. O The products overall function is “Drive Nails”. O The desired flow from the product is a driven nail. O The undesirable flows out of the product are noise and heat. A Pneumatic Nailer As designers we may want to minimize these undesirable outputs! 9/14/2025 6 6 Function Structure Key: Function = Verb + Noun! Material Material Verb + Noun Energy Energy Signal Signal Function - Verb Some frequently used verbs … Source Sink Absorb Create Dissipate Emit Release Supply Receive 9/14/2025 Store Combine Transform Accumulate Mix Amplify Store Couple Attenuate Record Link (sequential) Convert Constrain Filter Separate Modify Compare Shape Prepare Change Convey Channel Conduct Direct Divert Guide Transmit Transport Control Actuate Detect Sense Display Maintain Resist (deformation) Support (loading) Stabilize (buckling) 7 7 Function Structure Step 3 Tracing Flows ❑Input flows are traced through the system as they are transformed by the functions. O Nails are accepted and stored. Then one nail is isolated and finally Kinetic energy is applied to drive the nail. Tracing of the flow “Nails” through the product. Tracing of the flow “Compressed Air” through the product. Tracing of the flow “Trip Signal” through the product. 9/14/2025 8 8 Function Structure Step 4 Assembling the Traces ❑To assemble the traces functions in more than one trace must be combined. O Apply K.E. (Kinetic Energy) function is in the “C. Air” (Compressed Air) and the “Nails” traces. Traces assembled. 9/14/2025 9 9 Function Structure Step 5 Selecting the Boundary ❑Define devices boundary. ❑The boundary separates the Functions that the device must perform from the functions that the operator or another device must perform. The final FSD for the nailer. The boundary should agree with the scope of the project described in the design brief. 9/14/2025 10 10 Function Structure A Pneumatic Nailer The final FSD for the nailer. 9/14/2025 11 11 Example: Project SHARK – Fall 2014, OU Design, build and test a SHARK system capable of moving overland a distance of eight (8) feet, and then enter a harbor. The SHARK must cover the eight (8) feet as rapidly as possible. Upon entering the 'harbor' the SHARK must retrieve as much Klepp as possible within set time limits. Figure 2: Layout of Testing Area Team 2.9 “The Kleppers”, Fall 2014, University of Oklahoma 9/14/2025 12 12 SHARK – Function Structure Provide Buoyancy Not verb-noun tuples!!! Team 2.8: Aqua WALL-E. Fall 2014, OU All functions in the flow MUST be verb-noun tuples. Identify ones that are NOT verb-noun tuples. 9/14/2025 13 13 Let`s Start with the Morphological Chart/Matrix Creative Think Tank ❑Step 1: Select the idea you are pursing and define whether to innovate in the product. ❑Step 2: Select a criteria or parameter for your product that inherently changes the systems or your idea…criteria that change how it works. ❑Step 3: Filling the blanks with several choices that come up in your head…use deep divergent thinking. Produce ideas per minute even lame and stupid ideas. Don´t stop! ❑Step 4: Steve Jobs way. Connecting the dots. The ones that make sense for your mind. Write them down as a list and later evaluate each one of them. 9/14/2025 14 14 Morphological Chart – Material Project POP 9/14/2025 15 15 Morphological Chart – Energy Project POP 9/14/2025 16 16 Morphological Chart – Information Project POP 9/14/2025 17 17 Method for Generating Concepts Randomly go through sub function / solutions embodied in morphological chart to help identify combinations, i.e., working structures of sub-systems. Each combination of working principles should fulfill overall function (i.e., promises physical and geometric compatibility and smooth flow of Energy, Material, and Information). P&B: Figure 4.18/3.25. Starting with a concept and mapping it into the morph chart is NOT acceptable 9/14/2025 18 18 Concept Generation using Morphological Chart Material Collect Klepp Nets Arms Scoop Pocket Keep Klepp Nets Arms Scoop Pocket Reservoir Energy Store Power Rubber Band Steam Power R/C Airplane Motor R/C Car Motor Convert Power Mechanical Heat Chemical Electrical Toothbrush Spring Signal Trigger Device Button Switch Lever Candle Travel 8 Feet Wheels Bearings Propellers Paddle Boat Wheels Hamster Power Go in Water Foam Wood Boats Watermelon Plastic Navigate Water Sail Programming Oars Rudders Propellers Stop SHARK Timer Run Out of Power Run Out of Chemicals Kill Switch Concept 1 Concept 2 Concept 3 Concept 4 Concept 5 Concept 6 9/14/2025 Table on next slide is better than what is shown on the left MUST include description of method used to generate concepts. 19 19 Alternate solution principles • Solution principle = combination of compatible WPs • Multiple alternate SPs could be derived from the morph chart • Examples Current WP 2 WP 3 WP 4 WP 5 Function 1 Function 2 Function 3 Function 4 Function 5 Solution 1 9/14/2025 Solution 2 20 20 Description of Concept Tied to components in morph. chart Text that immediately follows picture Descriptive sentences of each subsystem using verb-noun tuple used to create function structure. How this concept works. PMI analysis to ensure FUNCTIONAL feasibility and speculations on TECHNICAL feasibility and BUILDABILITY. Summary comment on PMI analysis. What could go wrong and workaround. 9/14/2025 21 21 0 Design problem 1 Form team 2 Plan the design process 0 Design problem 1 Form team The SHARK Project 2 Plan the design process 3 Understanding the customer/design requirements 4 Understand and develop product functions Team organization Overall design task 5 Generate concepts 6 Develop concepts 7 Develop product 8 Develop prototype Release documents Remove Offcuts Check Quality Count Tiles Supply Packing Material Combine in lots Pack Tiles Dispatch lot Whats Remove Rejects Function structure Units This Product How Muches Customer Evaluation Hows Whats vs Hows This Product Separ ate offcuts Hows vs Hows Now Now vs What Stamp Tiles from length Send Signal to combine n tiles into one lot 3 Understanding the customer/ design requirements Name 1 Name 2 Name 3 Who 4 Understand and develop product functions Who vs. Whats Design Process Project plan Hows vs How Muches Targets Requirement list 5 Generate concepts 6 Develop concepts In Context of Requirements List Develop Function Structure, Morphological Chart and then Generate and Critically Evaluate Concepts. Documentation of concepts Selected concept 7 Develop product 8 Develop prototype Product details Release documents 9/14/2025 22 22 Innovative design • A journey from the problem to the solution Solution unknown Req’mts Functions Working Principles Structure Who are the stakeholders? What are their needs? Which actions and sub-actions should the solution perform? Which principles can we use to realize the functions? Which components can we use to realize the principles? What are the specific technical requirements of the design? Which operations of material, energy, and data must happen? Which principles are compatible to each other? What should be their form (shape, size, material, color, etc.)? How should these actions be connected to produce the effect? How do the principles address the needs? How will the product be built, assembled, tested, serviced, etc.? What defines a good solution? How will it create value? 9/14/2025 Solution known 23 23 Innovative design • Try these steps on a coffeemaker Req’mts 9/14/2025 Functions Working principles Structure Definition Definition Definition Definition Conditions imposed by various stakeholders that the solution must / should satisfy. Actions (verbs) that the design performs. Principles of physics or science using which the design realizes the functions and requirements. The physical embodiment or realization of the design. 24 24 Concept evaluation – Decision matrix Reqmt Weight Factor Concept 1 Raw Wtd. Concept 2 Raw Wtd. Concept 3 Raw Req 1 0.3 7 5 3 Req 2 0.7 5 2 9 Req 3 0.9 5 8 4 Req 4 0.5 2 9 7 Req 5 0.4 6 4 5 Wtd. Total • Use decision matrices to verify your choice, not to make the choice • Avoid outright rejections. The final concept often emerges by combining elements from multiple concepts. 9/14/2025 25 25 0 Design problem 1 Form team 2 Plan the design process 0 Design problem 1 Form team The SHARK Project 2 Plan the design process 3 Understanding the customer/design requirements 4 Understand and develop product functions Team organization Overall design task 5 Generate concepts 6 Develop concepts 7 Develop product 8 Develop prototype Release documents Remove Offcuts Check Quality Count Tiles Supply Packing Material Combine in lots Pack Tiles Dispatch lot Whats Remove Rejects Function structure Units This Product How Muches Customer Evaluation Hows Whats vs Hows This Product Separ ate offcuts Hows vs Hows Now Now vs What Stamp Tiles from length Send Signal to combine n tiles into one lot 3 Understanding the customer/ design requirements Name 1 Name 2 Name 3 Who 4 Understand and develop product functions Who vs. Whats Design Process Project plan Hows vs How Muches Targets Requirement list 5 Generate concepts 6 Develop concepts In Context of Requirements List Develop Function Structure, Morphological Chart and then Generate and Critically Evaluate Concepts. Documentation of concepts Selected concept 7 Develop product 8 Develop prototype Product details Release documents 9/14/2025 26 26 Preliminary solution concepts 9/14/2025 27 27 Computer-Aided Engineering: Computer-Aided Modeling and Finite Element Analysis 9/14/2025 28 28 Thank you! Anand Balu Nellippallil, Ph.D. Assistant Professor Department of Mechanical and Civil Engineering Florida Institute of Technology Office: F.W. Olin Engineering Complex, Room: 210 Email: anellippallil@fit.edu 9/14/2025 29 29
0
advertisement
Related documents
Download
advertisement
Add this document to collection(s)
You can add this document to your study collection(s)
Sign in Available only to authorized usersAdd this document to saved
You can add this document to your saved list
Sign in Available only to authorized users