class 4 and 5

class 4 and 5 - 11 Operations Management Class 1 Course...

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Unformatted text preview: 11 Operations Management Class 1: Course Overview and Introduction to Processes Class 2: House building game and process design Class 3: Process Analysis Class 4 and 5: Process Analysis » Capacity Analysis » Inventory Build-up » Little’s Law 22 Summary of Class 3 ◆ Process mapping basics – Key steps in process mapping – Get feedback and validate maps ◆ Process analysis basics – Capacity rate: the maximum rate at which units can flow through a process – Bottleneck: The resource with the lowest capacity rate in a process » It determines the capacity rate of the process – Flow Time or Throughput Time: Length of time a unit spends in system » In practice many firms use the terms “cycle time” to refer to flow time 33 Learning Objectives: Class 4 and 5 ◆ Discuss the Kristen’s cookie assignment ◆ More on process analysis – Process analysis with multiple flow units – Utilization and utilization profiles – Inventory Build-up diagram – Little’s Law 44 Linear Flow chart Mix Load Bake Unload Cool Pack Pay Spoon Hold 55 Swim-lane (deployment) flowchart Resources Activities You Roommate Oven Oven Roommate Spoo n Load Bake Cool Pack Mix Pay 66 Kristen’s Cookie questions 77 Rest of Class 4 and 5 ◆ More on process analysis – Process analysis with multiple flow units – Utilization and utilization profiles – Inventory Build-up diagram – Little’s Law 88 Process analysis with multiple flow units Resource Unit Load (minutes/unit) Product A Product B Product C 1 2.5 2.5 2.5 2 1.5 2 2.5 3 12 4 3 3 5 3 3 3 ◆ If you are producing only Product A, what is capacity rate of the process (per hour)? Which resource is the bottleneck? ◆ If you have to produce 1 unit of Product A, 2 units of Product B and 2 units of Product C every hour, what is your capacity rate? Which resource is the bottleneck? 99 Process analysis with multiple flow units Resource Unit Load (minutes/unit) Product A Product B Product C 1A + 2B + 2C 1 2.5 2.5 2.5 12.5 2 1.5 2 2.5 10.5 3 12 12 4 3 3 12 5 3 3 3 15 ◆ When multiple flow units go through a process, the “product mix” needs to be considered while determining the unit load and the capacity ◆ The bottleneck depends on the product mix 1010 Process analysis with multiple flow units ◆ Flow diagrams are not easy to draw ◆ How to identify bottleneck? – Count the total amount of work per resource (also known as the “unit load”) ◆ When multiple flow units go through a process, the “product mix” needs to be considered while determining capacity ◆ The bottleneck depends on the product mix ◆ The bottlenecks can move as the product mix changes 1111 Theoretical versus effective capacity ◆ Some capacity is lost due to machine maintenance, machine set-ups, etc....
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This note was uploaded on 05/06/2010 for the course COMM Comm 399 taught by Professor Krishnan during the Spring '09 term at UBC.

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class 4 and 5 - 11 Operations Management Class 1 Course...

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