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design:design_concept [2021.06.29 21:36]
Fil Salustri
design:design_concept [2021.11.10 11:04] (current)
Fil Salustri [Step 5: Refine final concept]
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     * This final concept must (a) satisfy all the requirements, and (b) satisfy the needs of all the Personas in their respective SUCs.     * This final concept must (a) satisfy all the requirements, and (b) satisfy the needs of all the Personas in their respective SUCs.
  
-**IMPORTANT NOTES**+== Important notes ==
  
   * You may find you are unable to integrate the individual concepts due to some incompatibility that only became evident once individual concepts were compared.   * You may find you are unable to integrate the individual concepts due to some incompatibility that only became evident once individual concepts were compared.
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 ==== Step 4: Build usage scenarios of final concept ==== ==== Step 4: Build usage scenarios of final concept ====
  
-Given a final design concept, each team member will create a [[usage scenario]] describing how their [[Persona]] would use the concept in their [[SUC]]. See the page on [[usage scenario]]s for details+Given a final design concept, each team will develop single [[usage scenario]] describing the "ideal" way that a generic user ought to use the product represented in the design. See the page on [[usage scenario]]s for details.
- +
-There will thus be as many usage scenarios as there are members in a team.+
  
 +A reasonable metaphor for the usage scenario is that of a visual "instruction manual" for the product. The usage scenario will provide a baseline of use for subsequent analysis (see below).
 ==== Step 5: Refine final concept ==== ==== Step 5: Refine final concept ====
  
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 Specifically: Specifically:
-  - Working together, look for several [[interaction error]]s in your final concept by analyzing the [[usage scenario]]s.+  - Working together, look for several [[interaction error]]s in your final concept by analyzing the [[usage scenario]] from the point of view of each [[Persona]].
   - Working together, look for ways to address the interaction errors of the final concept to improve the concept.   - Working together, look for ways to address the interaction errors of the final concept to improve the concept.
  
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 A complete tutorial on the tool is available at {{mec325_rdcg_tutorial.pdf}}. A complete tutorial on the tool is available at {{mec325_rdcg_tutorial.pdf}}.
  
-The Google Sheet itself is available [[https://docs.google.com/spreadsheets/d/1E-Tv8Np-WBVvroCn2J3fYxeubdytru9GtH4ug6_GzAI/edit?usp=sharing|here]]((Original slightly buggy version is [[https://docs.google.com/spreadsheets/d/1NpgdqLJgxxrqxZrtQ2HDeA8cbqOrIMULuOEAr0pRR4M/edit?usp=sharing|here]])). **You must make a copy of this Sheet before trying to use it.** If you "break" the spreadsheet, just download a fresh copy.+The Google Sheet itself is available [[https://docs.google.com/spreadsheets/d/1B-m-glsSjGbmY54oAglT6oTEPlHfQ1-lSTjw_dOjHTg/edit?usp=sharing|here]]. **You must make a copy of this Sheet before trying to use it.** If you "break" the spreadsheet, just download a fresh copy.
  
 **SPECIAL NOTE 1:** When you load the spreadsheet for use, look for the ''MEC325'' menu in the menu-bar. If you do not see it, try reloading the spreadsheet. **SPECIAL NOTE 1:** When you load the spreadsheet for use, look for the ''MEC325'' menu in the menu-bar. If you do not see it, try reloading the spreadsheet.
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     * Each concept will fit on one page: half a page for a sketch of the concept, followed by no more than half a page description of its key features. Include in the description only features that are not already evident in the sketch.     * Each concept will fit on one page: half a page for a sketch of the concept, followed by no more than half a page description of its key features. Include in the description only features that are not already evident in the sketch.
   - Descriptions of all the IEs that were addressed during refinement of the preliminary concepts, per [[#Step 2: Refine preliminary concepts|Step 2]].   - Descriptions of all the IEs that were addressed during refinement of the preliminary concepts, per [[#Step 2: Refine preliminary concepts|Step 2]].
-  - All the refined concepts, per [[#Step 2: Refine preliminary concepts|Step 2]].+  - All the refined preliminary concepts, per [[#Step 2: Refine preliminary concepts|Step 2]].
     * Each concept will fit on one page: half a page for a sketch of the concept, followed by no more than half a page description of its key features. Include in the description key changes that were made during refinement.     * Each concept will fit on one page: half a page for a sketch of the concept, followed by no more than half a page description of its key features. Include in the description key changes that were made during refinement.
-  - One page summarizing the final concept, per [[#Step 3: Integrate preliminary concepts|Step 3]]. (Half page sketch plus half page description of how the preliminary concepts were combined.)+  - Three pages summarizing the final concept, per [[#Step 3: Integrate preliminary concepts|Step 3]]. (One page sketch plus up to two pages of description of how the preliminary concepts were combined.)
   - All the usage scenarios developed, per [[#Step 4: Build usage scenarios of final concept|Step 4]].   - All the usage scenarios developed, per [[#Step 4: Build usage scenarios of final concept|Step 4]].
 +    * Each US must make clear what Persona and SUC were involved.
   - Descriptions of all the IEs that were addressed during refinement of the final concept, per [[#Step 5: Refine final concept|Step 5]].   - Descriptions of all the IEs that were addressed during refinement of the final concept, per [[#Step 5: Refine final concept|Step 5]].
-  - A description of the refined final concept, per [[#Step 5: Refine final concept|Step 5]]. +  - The refined final concept, including page sketch of the concept and up to two pages of explanation of the refinements.
-    * In this case, you may have full page sketch of your refined final conceptand **up to four pages of explanatory text**. +
-      * Make sure to describe in detail and in plain language how your team's refined final concept satisfies the requirements and addresses the needs of your Personas, given their HFs.+
  
 ===== However ===== ===== However =====
 +
 +:todo:
 +
 +/* OLD STUFF (NOW IRRELEVANT) BELOW.
  
 It is vitally important to be able to justify every decision you make in this stage of the process. It is vitally important to be able to justify every decision you make in this stage of the process.
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 This step of the process is best done in one, long sitting.  It may be difficult to organize the time, but you will likely work faster and better if you can do the entire exercise in one (preferably) or two sessions.  Do not work on this in short bursts punctuated by distractions or other tasks - it is likely to lead to terrible results. This step of the process is best done in one, long sitting.  It may be difficult to organize the time, but you will likely work faster and better if you can do the entire exercise in one (preferably) or two sessions.  Do not work on this in short bursts punctuated by distractions or other tasks - it is likely to lead to terrible results.
-===== Examples ===== 
- 
-Consider the example discussed in the [[ideation]] page and reproduced below.  We will consider the brute force search in this case.  This is not a full example, but it is intended to show some aspects of the method. 
- 
-<WRAP box> 
-//**Example problem**// 
-Design problem: You have to design a joint for a detachable robotic arm. It's basic systems are: 
-  - Structural system (to resist physical forces during operation) 
-  - Connection system (to attach and disconnect automatically) 
-  - Power system (to transmit power) 
-  - Data system (to transmit data) 
- 
-Here are some ways to embody these systems.  (This can be thought of as a textual version of a [[morphological chart]]. However, do not think that //you// can just list embodiments this way. //You// have to create a proper morphological chart.) 
- 
-A. Structural system 
-  - Bolt and lug 
-  - Concentric rods/shafts 
-  - Cup and socket (like, say, your shoulder joint) 
-  - Meshed teeth in compression (as in the Canadarm; see image.) 
-  - Motorized hooks 
-  - Magnetics 
- 
-B. Connection/disconnection system 
-  - Mechanical gearing 
-  - Solenoid/electrical actuators 
-  - Hydraulics 
- 
-C. Power system 
-  - Space-rated electrical wire with mechanical connector 
-  - Space-rated electrical wire with magnetic connector 
-  - Induction transmission 
- 
-D. Data system 
-  - Space-rated electrical wire 
-  - RF transmission (as in radio) 
-  - IR transmission (as is a TV remote) 
-  - Microwave transmission 
-  - Laser (optical fibre) transmission 
-</WRAP> 
- 
-This set of embodiments represents 270 total concepts.  So we could use the Brute Force method in this case. 
- 
-We start by taking the first 10 concepts that do not have inconsistent embodiments.  Normally, this would include concepts A1-B1-C1-D1 through A1-B1-C2-D5. 
- 
-However, say we have decided that C2-D2 would be an inconsistent embodiment because of the RF noise between the magnetic connector in the power system and the RF receiver in the data system.  So we remove concept A1-B1-C2-D2 and replace it with the next concept, A1-B1-C3-D1. 
- 
-Now we consider the next concept, A1-B1-C3-D2, but we have C3-D2 also listed as an inconsistent embodiment, so we discard it and go on to A1-B1-C3-D3. 
- 
-We then compare A1-B1-C3-D3 to each of the 10 concepts currently in our list and look for a concept that we believe will be less suitable than it, with respect to the requirements. 
- 
-Since all the concepts so far have A1 and B1 in common, we can start by focusing on C3 and D3.  While induction transmission of power and IR data communications both have disadvantages in space application((Induction transmission has significant losses compared to direct connections, and IR transmission in space can be affected by the severe temperature differences between sunlit and shaded regions.)), they pose a distinct advantage together.  In conjunction, they remove all need for direct, fixed connections between the robot elements.  This will significantly reduce the physical complexity of the connector that we are designing because with C3-D3.  Reduced complexity (i.e., increased simplicity) will generally reduce cost and increase reliability.  So concept A1-B1-C3-D3 has certain merits. 
- 
-In this example, we cannot really judge which concept in our list is the worst compared to A1-B1-C3-D3 because we do not have a precise set of requirements.  (This underscores how important it is to have a crisp and complete set of requirements during this stage of the design process.)  Still, we may argue that concept A1-B1-C1-D1 is significantly worse than A1-B1-C3-D3 because the former will require higher precision connection (especially during the connection and disconnection operations) than the latter. 
- 
-So we (a) discard A1-B1-C1-D1 for A1-B1-C3-D3, and (b) note why the latter is preferred to the former. 
  
-**NOTE TO STUDENTS.** You //will// have a usable set of requirements, so you //will// be expected to judge much more precisely why a given concept is better or worse than some other concept.+*/
  
-We continue in this fashion until we have checked every possible concept. 
  
 /* /*
design/design_concept.1625016984.txt.gz · Last modified: 2021.06.29 21:36 by Fil Salustri