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Cutting corners with a new crane concept

Lindroos, Ola and Bergström, Dan and Johansson, Petter and Nordfjell, Tomas (2008). Cutting corners with a new crane concept. International journal of forest engineering. 19:2, 21-28
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Abstract

It is only possible to pivot (horizontally rotate) conventional harvester cranes at the crane pillar. A new type of harvester crane has an extra pivoting point on the outer boom, which makes it possible to reach behind residual trees and thus probably ease thinning work. This paper quantifies differences in harvester time consumption between a conventional crane and a pivoting outer boom (POB) crane in thinning by the use of a simulation study and a field study. Simulations were made in two mapped stands. A harvester equipped with a POB crane was used in the field study. The work of a conventional crane was performed with the same machine by not using the pivoting function. Six blocks were created with densities ranging from 1230 to 3100 trees per hectare and the tree choice was restricted.
The POB crane required 4-8% less time compared to the conventional crane in the simulation study and 7-15% less in the field study. In the field study, the POB crane’s mean time consumption was significantly lower for the work elements machine movement backwards and crane out. The number of machine movements backward was significantly lower for the POB crane, and 17% more trees could be cut per machine position by the POB crane. The pivoting function was used on 29% of the cut trees. Based on the consistent results from the simulation and the field study, it is concluded that the pivoting function significantly increased productivity in thinning.

Authors/Creators:Lindroos, Ola and Bergström, Dan and Johansson, Petter and Nordfjell, Tomas
Title:Cutting corners with a new crane concept
Series/Journal:International journal of forest engineering (1494-2119)
Year of publishing :2008
Volume:19
Number:2
Page range:21-28
Publisher:Forest Products Society
ISSN:1494-2119
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:J Handling, transport, storage and protection of agricultural products > J12 Handling, transport, storage and protection of forest products
K Forestry > K11 Forest engineering
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 203 Mechanical Engineering > Production Engineering, Human Work Science and Egonomics
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:machine development, comparative time study, simulation, time consumption, productivity, thinning, CTL, harvester
URN:NBN:urn:nbn:se:slu:epsilon-e-178
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-178
ID Code:8226
Department:(S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management
Deposited By: Ola Lindroos
Deposited On:17 Aug 2011 06:47
Metadata Last Modified:02 Dec 2014 10:46

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