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

12/28/08 - L6 ProcessesCopyright 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

12/28/08 - L6 ProcessesCopyright 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

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 Joanne DeGroat, ECE, OSU4

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 Joanne DeGroat, ECE, OSU5

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 Joanne DeGroat, ECE, OSU6

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 Joanne DeGroat, ECE, OSU7

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 Joanne DeGroat, ECE, OSU8

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 Joanne DeGroat, ECE, OSU9

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

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 Joanne DeGroat, ECE, OSU11

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 Joanne DeGroat, ECE, OSU12

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 Joanne DeGroat, ECE, OSU13