A Comparison of Cutting Patterns for a Track-Type Feller-Buncher

Developing operational efficiencies for highly capitalized harvesting equipment is an important factor for maintaining profitability. This study explores several alternatives for increasing the efficiency of a track-type feller-buncher with a rotatable boom-mounted shear. The machine operates by harvesting all trees within reach at successive stopping points. Seven modifications to the machine’s basic cutting pattern were analyzed. It is assumed that the machine harvests in continuous strips, all harvesting is clearcutting, accumulating shears are not used, and trees to be harvested exhibit a random spatial pattern. For each cutting pattern, the simulated harvest of trees is performed for 2 bunch location alternatives over 3 stand densities: 100, 300, and 500 trees per acre. Comparison of potential efficiencies of each pattern are made on a relative basis using five variables: boom swing distance, boom extension/retraction distance, ground distance traveled by the machine, the number of stops or settings, and the number of stems harvested at each stop. In general, results show that efficiency can be increased by maintaining maximum strip width, as limited by the maximum boom reach of the machine, and that a variable bunch location alternative has the potential for enhancing efficiency. More specifically, a modified cutting pattern is identified that should provide an optimal longrun strategy if employed uniformly and consistently.

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