The Enhanced Electronic Assembly and Test System

ARENA20.11.13

Problems in previous model

• Based on previous simulation result, we realized that there is a problem in rework process.

• Its queue length is longer than other processes.

MISSING INFORMATION WHILE CONSTRUCTING THE MODEL (1)

• In rework process there are two shifts a day and on the second shift there are two operators assigned to rework operation.

MISSING INFORMATION WHILE CONSTRUCTING THE MODEL (2)

• Periodically, the sealer machine breaks down. • Let’s assume that the mean uptime (from the end

of one failure to the onset of the next failure) was found to be 120 minutes and that the distribution of the uptime is exponential (which, by the way, is often used as a realistic model for uptimes if failures occur randomly at a uniform rate over time).

• The time to repair also follows an exponential distribution with a mean of 4 minutes.

MISSING INFORMATION WHILE CONSTRUCTING THE MODEL (3)

• The production manager indicated that she was considering purchasing special racks to store the waiting parts in the rework queue. These racks can hold ten assemblies each, and she would like to know how many racks to buy.

• Resource Schedule• Resource Failure• Frequencies Statistics