MIT2_854F10_qualquan

MIT2_854F10_qualquan - Quality / Quantity Interactions...

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Unformatted text preview: Quality / Quantity Interactions Lecturer: Stanley B. Gershwin Goals of Talk To show that there is great advantage in treating quality and quantity simultaneously in the design and operation of manufacturing systems. To report on M IT research. Collaborators: lrvin C. Schick, Jongyoon Kim. To enlist additional industry assistance. General Motors R & D has generously contributed to the support of this work. Introduction In manufacturing, Quantity is about how much is produced, when it is produced, and what resources are required to produce it. Quality is about how well it is made, and how much of it is made well. Production quality is about not giving customers what they do not want. Introduction I I Quantity measures include production rate, lead time, inventory, utilization. Quality measures include yield and output defect rate. Introduction I I Quantity strategies include optimizing local inventories, optimizing global inventory, other releaseldispatch policies, make-to-order, etc. Quality strategies include inspection, statistical process control, etc. The Problem Introduction The problem is that, conventionally, ... Quantity strategies are selected according to how they affect quantity measures, and Quality strategies are selected according to how they quality measures, but ... in reality, both affect both . I Quantity I Two-machine, one-buffer production line. All production is perfect quality. P The machines are unreliable - they fail at random times and are repaired at random times. We vary the buffer size N and observe its effect on the production rate P . Observation: the production rate increases monotonically up to a limit. Machine Reliability Dynamic Quantity Simplest model Statistical Process Contro Quality a Goal is to determine when a process has gone out of 3ut of controi control ....
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This note was uploaded on 02/24/2012 for the course MECHANICAL 2.854 taught by Professor Stanleygershwin during the Fall '10 term at MIT.

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MIT2_854F10_qualquan - Quality / Quantity Interactions...

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