Graduate Thesis Or Dissertation
 

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

Public Deposited

Downloadable Content

Download PDF
Request Accessible Version
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/sb397c05w

Descriptions

Attribute NameValues
Creator
Abstract
  • 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.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Publisher
Language
Replaces
Accessibility Feature

Relationships

Parents:

This work has no parents.

In Collection:

Items

Thumbnail Title Date Uploaded Visibility Actions
file details NickersonDevon1978revised.pdf 2017-08-14 Public Download