A production scheduling simulation model for improving production efficiency

Figures & data

Figure 1. The scheme of the simulation model.

Table 1. The simulation result for original allocated machines

Station	The current machine allocations	Mean utilization of the machines	Mean order tardiness rate
Station 1	6	.727	.5%
Station 2	11	.727
Station 3	1	.725
Station 4	7	.726
Station 5	7	.726
Station 6	6	.726

Table 2. The simulation result for amended allocated machines

Station	The amended machine allocations	Mean utilization of the machines	Mean order tardiness rate
Station 1	6	.719	5.43%
Station 2	11	.721
Station 3	1	.719
Station 4	6	.846
Station 5	6	.846
Station 6	6	.726

Table 3. The dispatching rules with original machines allocations time unit (h)

Dispatching rule	Mean completion time	Mean flow time	Mean waiting time	Maximum flow time	Mean tardiness time	Maximum tardiness time	Mean order tardiness rate (%)
FIFO	80.21	35.86	28.46	87.95	−272.3	5.84	.50
LIFO	88.38	36.15	28.75	88.80	−267.4	223.91	2.32
EDD	83.24	36.20	28.80	89.28	−273.2	3.44	.30
SPT	72.92	35.45	28.06	86.90	−272.1	49.47	.93
SRPT	85.26	36.12	28.73	87.72	−275.9	122.14	1.23
SRPT/SPT_Min	73.99	35.71	28.32	88.93	−276.8	80.71	.88
SRPT/SPT_Max	94.59	36.44	31.44	89.81	−261.9	168.11	3.53

Table 4. The dispatching rules with amended machines allocations time unit (h)

Dispatching rule	Mean completion time	Mean flow time	Mean waiting time	Maximum flow time	Mean tardiness time	Maximum tardiness time	Mean order tardiness rate (%)
FIFO	156.6	89.7	82.3	156.6	−219.2	48.8	5.43
LIFO	162.6	95.0	87.6	160.8	−223.4	391.6	3.34
EDD	140.2	81.1	73.7	138.1	−228.6	13.8	3.40
SPT	140.5	89.3	81.9	154.6	−241.7	206.9	2.55
SRPT	140.0	88.4	81.0	149.8	−236.3	232.5	2.59
SRPT/SPT_Min	153.9	97.6	90.2	164.4	−223.9	338.5	2.77
SRPT/SPT_Max	227.7	97.1	89.7	162.2	−153.4	534.5	10.79