A model for the determination of optimum setting dimensions for tractor yard/swing operations Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/sb397c05w

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  • A problem of interest to forest managers is the optimum arrangement of truck roads and landings for economical logging operations. This problem becomes more complex if,a combined yarding and swinging operation is considered. I,t is possible to formulate a mathematical model to express the cost per unit volume for a particular configuration of truck roads, landings, and swing roads arranged to accommodate this type of harvest operation. Then, any of several numerical methods may be employed to assess the sought-for optimum configuration. The parameters of interest are the truck road spacing, landing spacing, and swing road length that produce the smallest logging cost. This paper critically examines several assumptions made in formulation of the problem, including yarding cost computation, tractor movement patterns, and average yarding distance. This paper uses a numerical method not frequently employed with constrained objective functions: Newton Multivariate Gradient Iteration. A computer program was developed to implement the iteration procedure, using a Hewlett-Packard 9830A Desktop Computer. The solution procedure reduced iterations required for convergence from several thousand experienced with exhaustive enumeration techniques to less than thirteen. The use of this gradient method, observations on its behavior, and insights into the analytical approach to a complex problem are the subjects of this paper.
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  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2008-11-13T18:01:13Z (GMT) No. of bitstreams: 1 Nickerson, Devon MS.pdf: 616789 bytes, checksum: 66092d9c32f761a4bd19cdacb22cbb91 (MD5)

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