week 10 - work systems

Question 1

what is the cycle time (CT)?

Answer 1

> interval of time between the exit of 2 consecutive units at a stage , or at the end of a process

> CT = ST / nb of ressources

Question 2

what is the production rate (PR) of a workstation ?

Answer 2

> number of units produced per unit of time (1h)

> rate = 60 min / CT or 1h / CT

Question 3

what is the difference between sequential VS parallel process?

Answer 3

sequential: process where work is divided in a series of specialized tasks

parallel: process where each employee realizes all task independently for the others

Question 4

what is the PR or a sequential process?

Answer 4

the PR of a sequential process is equal to the rate of the bottleneck

Question 5

what is the PR of a parallel process (steps of calculations)

Answer 5

1. sum of ST of each stations
2. unit rate = 60 min / sum of ST
3. total rate = nb of employees * unit rate

Question 6

formula of utilization rate of the workstation of a stage (sequential process)

Answer 6

utilization rate = CT of the stage / CT of bottleneck

Question 7

formula for utilization rate of a worker

Answer 7

= (total ST - machine time) / total ST