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Innovative productivity improvements in forest operations: a comparative study of the Assortment Grapple using a machine simulator

Manner, Jussi and Berg, Simon and Englund, Martin and Ersson, Back Tomas and Mörk, Anders (2020). Innovative productivity improvements in forest operations: a comparative study of the Assortment Grapple using a machine simulator. Journal of Forest Science. 66 , 443–451
[Research article]

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Abstract

Because of generally small log piles, loading forwarders during thinning is time consuming. The Assortment Grapple, an innovative grapple with an extra pair of claws which facilitates the handling of two assortments during one loading crane cycle, has been designed to decrease forwarders’ loading time consumption. A standardized experiment was performed in a virtual thinning stand using a machine simulator with the objectives to form guidelines for working with the Assortment Grapple and to analyse its development potential. Four experienced operators participated in the study. According to the results, the Assortment Grapple’s accumulating function is beneficial only when there are no remaining trees between piles loaded during the same crane cycle. In such cases, none of participating operators lost time, and 3 of 4 operators saved time notably. The problem with the remaining trees is the extra time required to steer the crane tip around them. Therefore, a harvester should place those log piles that are later to be forwarded together in the same space with no remaining trees between the piles. Furthermore, we recommend that the Assortment Grapple’s usability will be improved by adding an own rocker switch on the forwarder’s controls to command the extra claws.

Authors/Creators:Manner, Jussi and Berg, Simon and Englund, Martin and Ersson, Back Tomas and Mörk, Anders
Title:Innovative productivity improvements in forest operations: a comparative study of the Assortment Grapple using a machine simulator
Series Name/Journal:Journal of Forest Science
Year of publishing :2020
Volume:66
Page range:443–451
Number of Pages:9
ISSN:1212-4834
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:crane, cut-to-length method, forwarder, loader, operator, thinning
URN:NBN:urn:nbn:se:slu:epsilon-p-108960
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108960
Additional ID:
Type of IDID
DOI10.17221/104/2020-JFS
ID Code:19119
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management
Deposited By: SLUpub Connector
Deposited On:07 Dec 2020 17:03
Metadata Last Modified:15 Jan 2021 19:26

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