Simulation Using GPSS
System Simulation
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Two small log sawmills of different but typical configurations were modelled using GPSSV. Both models covered the whole mill from infeed deck to green chains and stackers. Such models have large memory requirements and required reallocation of common memory. User chains were also used to reduce processor scanning time. Very simple downtime generators were used to randomly distribute downtime episodes of random length to several different sawing centers. These downtime segments make use of the 'unavailable' feature. The head sawyer is also included in each model. The understanding of the decisions this person has to make was a major benefit of the model. Some experimentation has taken place on the possibility of using a micro-computer to relieve him of some of his decisions. The creation and use of the sawmill models was valuable for mill operating people as they now better understand the systems they are operating. One of these mills is known as Mill Five and is now under construction in Washington. The other, more complex, mill is located at Blue Ridge, Alberta. It was finished just over a year ago.