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Performance Measures
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Table 2 summarises performance measures appearing in papers. Flowtime related measures have attracted the most attention, followed by tardiness related measures and utilisation related measures.
2.3 Review of Related Publications
Nof et al. [44] studied the control problem in an FMS. Three rules were considered for part releasing into the empty system, and two rules for part releasing into the loaded system. Two performance measures were employed, which were system utilisation and production rate. Their work showed that the
Table 2. Performance measures used in general FMS scheduling studies.
and RANDOM. Six performance measures, which are station utilisation, production rate and average throughput time for each part type, simulation time, total number of parts produced, and total processing time, were used in this study. The effect of transporter speed and capacity on production rate and station utilisation were discussed. It was concluded that the SPT rule was the best rule, as it resulted in higher production, higher utilisation, shorter throughput time, and less congestion in the system. Neither due-date assignments nor due-date-based measures of performance were employed in the simulation model.
Bell and Bilalis [46] investigated a real FMS consisting of three machines using a digital simulation. Only one decision point was considered in the simulation model. They explored the effect of three dispatching rules (SIO, LIO, and FIFO) on machine utilisation and throughput times. Due-date-based rule
and related measure of performance were not considered in
Performance Number of Reference number Period measures publications of publications
Flow-time 36 [4], [23], [25], 1979–2000
related [27], [28], [32],
[36], [44], [46–
48], [50–56], [58–
63], [66–69], [71],
[73–77] [79], [80]
Tardiness or 19 [23], [27], [28], 1983–2000
tardy job related [36], [47–49],
[59], [60], [62],
[70], [71], [73–
75], [77], [79–81]
Utilisation 17 [25], [27], [32], 1979–1995
related [36], [44], [46],
(including [49–52], [54–57],
system, machine, [60], [73], [74] station, etc.)
Cost related 6 [23], [47], [48], 1983–2000
[70], [74], [81]
Inventory related 6 [25], [36], [54], 1981–1995
[59], [60], [70]
Others 12 [25], [32], [34], 1981–1995
[36], [50], [51],