Graduate Thesis Or Dissertation
 

Simulation of a helicopter yarding system in old growth forest stands

Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/kw52jd54q

Descriptions

Attribute NameValues
Creator
Abstract
  • Helicopter yarding systems have become a popular tool in removing timber from steep slopes, sensitive soils, limited access areas, and environmentally sensitive stands. Little is known about the system's dynamics. This study is part of a research project to explore "advanced" logging systems as to their economic efficiency and environmental applications. The objectives of my study were: 1 To identify and isolate variables that significantly influence helicopter yarding efficiency. 2 To develop a simulation model that will simulate the response of the helicopter yarding operations to changes in these variables. I observed a medium lift (Boeing-Vertol 107 Model II) helicopter operation yarding from old growth stands under varying conditions. The helicopter yarding cycle was broken down into four cycle elements and four delay elements. I used the method of continuous timing to observe these elements and obtain values for the variables that influence these elements. Multiple linear regression analysis was used to analyze the effect of these variables on time required to complete each cycle element. Regression equations were developed for two cycle element, outhaul and inhaul. Other cycle elements and delay elements were analyzed employing frequency distributions. A paired t-test was used to establish the reliability of the regression equations to precict element times. A FORTRAN simulation model was used to simulate the yarding system. The model can be used to estimate efficiency, production rates, and delay times for a wide range of yarding situations. I experimented with the finished model and, based on those results, made suggestions for system improvements.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Publisher
Language
Digitization Specifications
  • Master files scanned at 600 ppi (256 Grayscale) using Capture Perfect 3.0.82 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (256 B+W), using Capture Perfect 3.0.82, on a Canon DR-9080C. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces

Relationships

Parents:

This work has no parents.

In Collection:

Items

Thumbnail Title Date Uploaded Visibility Actions
file details Ledoux_Chris_B_1975.pdf 2017-10-20 Public Download