INTEGRATING HARVESTING AND OPERATIONS USING AN OPTIMIZED PRODUCTION PLANNING SYSTEM 124 C.
Brand Weasels , C. Sue Price , Philip Turner, Murray P. Dell
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E-mail:
[email protected] Abstract The opportunity exists for sawmills sourcing their logs from intensively managed softwood plantations to indude quality information as well as log and product volume in their production planning process. A destructive sampling procedure and three integrated software systems were developed and can be used to optimize profit of the timber manufacturing production chain. Using inputs from pre-harvest quality assessment procedures and software, and sawmill simulation software, a linear and mixed integer programming production planning system is used to find the optimum sawmill production plan subject to market and forest supply constraints . The outputs can also be used for harvest scheduling purposes. Keywords: Sawmill production planning, pre-harvest quality assessment, simulation, linear programming, mixed integer programming. University of Stellenbosch, South Africa
Forestry and Forest Products Research Centre UKZN I CSIR, South Africa Napier University, UK,
Formerly icomtek CSIR, South Africa
SAWMILL SAWMILL 341
Background In South Africa, sawmills source their timber from intensively managed softwood and hardwood plantations. Each compartment of trees is subjected to a single silvicultural
regime, and the trees planted there all come from the same genetic material. Pine plantations earmarlmg heights
o Knotty cores .... etc.
ezllr:•u'"•••••• wn:llptisiac ••n•• • Log diameters • K::totty cores • Log lengtlu S i w a y 6 PS.I"JIVi•• ftrcac:kltc da;u "
'' P rt4ytlta ••tit•
• SPPS nt!wizaitB Sa.,-mill production opt.:ons (saw.ng paUems) to use Comportmott to harrest Mrr.chandising rules to .;se
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Figure 1. Schematic of information flow In an Integrated decision
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The optimization system consists of three integrated software packages i.e. pre- harvest quality assessment software (PHQA), sawmill simulation software {Simsaw 6) and sawmill production planning software (SPPS). The PHQA support ayste111 for the timber production chain. • Board volumes, g:a
