1. 12/28/08 - L6 ProcessesCopyright 2009 - Joanne DeGroat, ECE, OSU1 Processes

2. 12/28/08 - L6 ProcessesCopyright 2009 - Joanne DeGroat, ECE, OSU2 Class 6 outline  What is a Process Description?  An outline for a Description  Example  Putting it all together  Ref: Finkelstein Ch5

3. 12/28/08 - L6 ProcessesCopyright 2009 - Joanne DeGroat, ECE, OSU3 Background  Process descriptions are similar to mechanism descriptions!  Difference – in content Mechanism description  Describe the physical attributes of a mechanism and how it operates Process description  Describe the steps of a process

4. But What is a Process??  “Process descriptions are precise portrayals of events occurring over time that lead to some outcome.”  They describe The steps in the operation of a mechanism The steps in a conceptual process  Focus less on the physical attributes of the mechanism and more on a mechanism’s function and how the parts work together. 12/28/08 - L6 ProcessesCopyright 2009 - Joanne DeGroat, ECE, OSU4

5. Process Description Example  Internal Combustion Engine Mechanism Description – the engine, the cylinder head, the block, the valves, the pistons, the crankshaft, … Process Description  The Intake stroke  The Compression Stroke  The Ignition (Combustion) Stroke  The Exhaust Stroke 12/28/08 - L6 ProcessesCopyright 2009 - Joanne DeGroat, ECE, OSU5

6. Process Description  Introduction Define the mechanism with a technical definition and add extensions necessary for the reader to understand the discussion. Describe the purpose function, and operation of the mechanism. List the major steps of the mechanism’s operation in the order that they will be discussed. 12/28/08 - L6 ProcessesCopyright 2009 - Joanne DeGroat, ECE, OSU6

7. Process Description (2)  Discussion Step 1  Define the Step with a logical definition and discuss it in reasonable depth.  Describe the equipment, material, or concepts involved with this step.  Describe what happens during this step.  Show the relationship between this step and the next. Steps 2 to n  Repeat as for step 1  Conclusion Summarize and provide closure. 12/28/08 - L6 ProcessesCopyright 2009 - Joanne DeGroat, ECE, OSU7

8. A Process description of an Air Conditioner  The Process Uses a fluid refrigerant Four major components  The compressor  The condenser coil  The expansion valve  The evaporator coil  The description discusses what happens in each step. 12/28/08 - L6 ProcessesCopyright 2009 - Joanne DeGroat, ECE, OSU8

9. The type of process  Process descriptions will vary depending on what is being described. Computer Algorithms Physical Processes  Chemical  Physical Engines AC Systems 12/28/08 - L6 ProcessesCopyright 2009 - Joanne DeGroat, ECE, OSU9

10. Consider the QuadFINKEL  It is a figure skating jump.  Text on pages 77 – 79  Can you do a QuadFINKEL??? 12/28/08 - L6 ProcessesCopyright 2009 - Joanne DeGroat, ECE, OSU10

11. Winemaking process  The winemaking process is the process for creating wine. The process varies slightly depending on the grape variety and the type of wine targeted. The process for red wines is typical of all of the variations.  Steps in the process. 12/28/08 - L6 ProcessesCopyright 2009 - Joanne DeGroat, ECE, OSU11

12. Steps  Pick the grapes when ripe.  The grapes are crushed and the pulp of the grape, along with the skin, is allowed to ferment.  Primary fermentation takes 1 to 2 weeks.  The liquid is transferred to vessels for secondary fermentation. During secondary fermentation the remaining sugars are turned into alcohol.  The wine is transferred to oak barrels for aging.  Aged wine is bottled. 12/28/08 - L6 ProcessesCopyright 2009 - Joanne DeGroat, ECE, OSU12

13. Mechanical description assignment  You described a mechanism  In you final proposal you most likely will have both mechanism descriptions and possibly a Functional Mechanism Description.  Writing a process description is not a formal classroom assignment, but in the documentation of your project proposal you may have to write one or more. 12/28/08 - L6 ProcessesCopyright 2009 - Joanne DeGroat, ECE, OSU13