Graduate Project
 

A simulation of the operation of a log landing for a heli-stat airship in old-growth timber

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https://ir.library.oregonstate.edu/concern/graduate_projects/z890s039m

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  • This paper discusses the development of a computer simulation program for the operation of a log landing for the proposed Helistat airship. The first part of the paper describes the time study used to develop production rates for the chasers, buckers, front-end loaders, and skidders to be used on the landing. A time study was performed on a helicopter landing resulting in regression equations or production probability distributions for each of the five job functions on the landing. Because the Heli-stat is capable of delivering a much larger payload than the helicopter that was studied, extrapolations of the time study results were necessary. A mechanical analysis was used to determine the production rate of a large rubber tired skidder used as a swing machine between the dropsite and the bucking chute. The second part of the paper discusses the features of General Purpose Simulation System (GPSS V) program used to simulate the Helistat landing. Queue lengths and equipment utilization rates were used as evaluation criteria in determining the minimum turn times that could be handled by a number of different landing configurations. Different crewing patterns were evaluated for landings with one or two dropsites for old-growth log loads consisting of either bucked logs, tree length logs, or whole trees with tops and limbs. Production rates and production costs based on delay free times were used to compare the various alternatives. The results indicate that tree length logging may have some definite advantages over the other two types because the long,limbed logs can be handled more efficiently than either the bucked logs or the whole trees. The results also show that a standard helicopter landing configuration increased in both physical dimensions and crew sizes can accommodate Heli-stat turn times of 4.0 to 6.0 minutes. A primary goal of this project was to develop production equations that could be used in a larger stump-to-cold-deck simulation of the entire Hell-stat yarding cycle. This larger simulation will be performed by the Aerospace Corporation of Los Angeles, California, and will incorporate the landing production rates developed here with yarding and load assembly production rates developed by John Miles and Bruce Hartsough at the University of California at Davis.
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