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EXERCISE 8 – Work Breaks and Macro Use

Please make the necessary changes to the previously created simulation model such that: at

the machine Locations NC_1 and NC_2 a worker performs a visual inspection, which results

in a work break for the machines, every hour. Additionally the runtimes are expressed as

normal distribution such that: the NC_1 and NC_2 run for N (3,0.2), the Deburring for

N(1.5,0.2) and the QC for N(3.2,0.3).

Modelling Instructions:

1. Macros – Create 2 Macros: one that represents the

number_of_workers

with a default

value of 1 and defined Options for RTI in the Range From 1 To 5, and the second

defining the

deburring_capacity

with a default value of 1 and defined Options for RTI

in the Range From 1 To 7

2. Location – Assign the work break

USE

resource name

FOR

N(1.2,0.1)

under DTs…

/Usage…, with a frequency of 60 (or

1 hr)

and a priority of 99 (this defines the

precedence of the Usage case over logic expressions of lower priority). Also replace

the Capacity of the Deburring station with the defined Macro:

deburring_capacity

3. Resources – Replace the Units with the defined Macro:

number_of_workers

4. Processing – Update the run times for the NC_1, NC_2, Deburring and QC

5. Simulation – Carry out several simulations and review the statistics for differences,

resulting from applying random variables. In the simulation Options change the

Number of Replications: e.g. 5