Effect of yarding operations on log recovery value
This thesis deals with the problem of controlling losses in log recovery value in yarding operations. It is believed that losses under current operating methods can be substantial over time. The objective is to find ways of applying statistical quality control methods to controlling and reducing...
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| Format: | Others |
| Language: | English |
| Published: |
2009
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| Online Access: | http://hdl.handle.net/2429/4909 |
| Summary: | This thesis deals with the problem of controlling losses in log
recovery value in yarding operations. It is believed that losses
under current operating methods can be substantial over time.
The objective is to find ways of applying statistical quality
control methods to controlling and reducing these losses.
A literature review was done to determine the statistical
techniques available. A pilot study was done concurrently to
determine the current levels of value loss and test methods of
measuring value loss. The final step was to recommend a
procedure for monitoring and controlling log value losses based
on the findings of the literature review and the pilot study.
Value loss estimates in the pilot study were consistent with
losses discussed in the literature (1-2%). The problems
encountered with the methods used in the pilot study, however,
were believed to be severe enough to limit the usefulness of the
methods and the results. The methods were found to be cumbersome
and time consuming as well as needing considerable refinement in
the area of scaling and grading for true value recognition.
The recommended statistical quality control method can be used
operationally without the necessity of immediate improvement of
scaling and grading techniques. The method involves observing
occurrences of log damage and recording detailed information
related to those occurrences so that the causes of the damage can
determined. Procedures can then be developed to correct these
causes. The method relies on the use of statistical control
charts for attributes for monitoring log damage and highlighting
periods of abnormal results for further investigation. === Forestry, Faculty of === Graduate |
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