2. CH7 Flashcards Preview

MAMS > 2. CH7 > Flashcards

Flashcards in 2. CH7 Deck (24)
Loading flashcards...
1
Q

Little’s Law

A

WIP = TH•CT

2
Q

The average quantity of good (non-defective) parts produced per unit time

A

Throughput (TH)

3
Q

Material stocked at beginning of routing

A

Raw material inventory

4
Q

Material held in a stock-point at the beginning of a routing

A

Crib inventory

5
Q

Material held in inventory prior to shipping to the customer

A

Finished goods inventory (FGI)

6
Q

Time between release of the jobs at the beginning of the routing until it reaches an inventory point at the end of the routing

A

Cycle Time (CT)

7
Q

Service Level

A

Pr(Cycle Time <= Lead Time)

8
Q

A manufacturing system is a goal-oriented network of process through which parts flow

A

Factory Physics Definition

9
Q

Plant is made up of routing (lines), which in turn are made up if processes

A

Factory Physics Structure

10
Q

Rate (parts or jobs/unit of time) of the process center having the highest long-term utilization

A

Bottleneck rate (rb)

11
Q

Sum of the long-term average process times of each station in the line

A

Raw Process Time (T0)

12
Q

A unit-less measure of congestion

A

Congestion coefficient (alpha)

13
Q

Alpha = 0

A

Zero variability case

14
Q

Alpha = 1

A

Practical worst case

15
Q

Alpha = Critical WIP (W0)

A

Worst possible case

16
Q

Maximum throughput with minimum cycle time

A

Critical WIP (W0)

17
Q

Critical WIP (W0)

A

W0 = rb•T0

18
Q

Max TH, min CT, no randomness

A

Best case performance

19
Q

Min TH, max CT, no randomness

A

Worst case performance

20
Q

In a balanced line, Critical WIP (W0) = Number of machines

A

In an unbalanced line, Critical WIP (W0) < Number of machines

21
Q

Maximum randomness

A

Practical worst case (PWC)

22
Q

Conditions for PWC

A
  1. Balanced line
  2. Single machines
  3. Memoryless
23
Q

If we improve the non-bottleneck

A

Then rb does not change, but it serves to reduce randomness

24
Q

Unbalanced lines exhibit

A

Less congestion than balanced lines