The Corrupting Influence of Variability - Flow Laws
4 important questions on The Corrupting Influence of Variability - Flow Laws
When does the law of conservation of material not hold?
- When the system is unstable. That is; when the input exceeds capacity.
- In the short run.
The only way to always have WIP is to start with an infinite amount of it. Thus, for Ra to be equal to Re, there must be an infinite amount of WIP in the queue. But by Little's law this implies that cycle time will be infinite as well. Nontheless, there is one exception to this behavior and the system will become completely deterministic. When?
When both en
are both equal to zero.
Without reading 9.3.3 we can already draw (at least) two important conclusions from figure 9.2. Which?
- High utilization ''blows up'' average CT (and average WIP) and is something which in general should be avoided (by controlling the release rates).
- Lowering variability enables us to get higher utilization at the same average CT or a lower CT at the same utilization.
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Are the following statements true or false?
1: If you have complete freedom in the placement of machines in a line, you should always try to have the machines with the highest variabilities downstream and the ones with lowest variability upstream.
2: Statement 1 does not matter for pull systems.
Both statements are true.
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