Kraftutveckling för manuella trädfällningsredskap
Force development for manual tree felling tools
Document identifier: oai:dalea.du.se:2346
Keyword: Tree felling,
Chain-saw,
Felling tool,
Felling equipment,
ModelPublication year: 2006Relevant Sustainable Development Goals (SDGs):
The SDG label(s) above have been assigned by OSDG.aiAbstract: The objective with this study has been to build general models of the mechanics in tree felling with chain-saw and to compare felling torque for different tools. The theoretical models are completed and validated with a comparative study. The study includes a great number of felling tools of which some are used with different methods. Felling torque was measured using a naturally like measuring arrangement where a tree is cut at about 3.7 m height and then anchored with a dynamometer to a tree opposite to the felling direction. Notch and felling cut was made as ordinary with exception that the hinge was made extra thin to reduce bending resistance. The tree was consequently not felled during the trials and several combinations of felling tools and individuals could be used on the same tree.
The results show big differences between tools, methods and persons. The differences were, however, not general, but could vary depending on conditions (first of all tree diameters). Tools and methods that push or pull on the stem are little affected by the size of the tree, while tools that press on the stump are very much dependent of a large stump-diameter. Hand force asserted on a simple pole is consequently a powerful tool on small trees. For trees of medium size there are several alternative methods with different sizes and brands of felling levers and wedges. Larger and more ungainly tools and methods like tree pusher, winch, etc. develop very high felling torque on all tree sizes. On large trees also the felling wedge and especially the use of several wedges together develop very high felling torque.
Authors
Tomas Gullberg
Högskolan Dalarna; Träteknologi
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header:
identifier: oai:dalea.du.se:2346
datestamp: 2021-04-15T12:02:26Z
setSpec: SwePub-du
metadata:
mods:
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version: 3.7
recordInfo:
recordContentSource: du
recordCreationDate: 2006-10-10
identifier: http://urn.kb.se/resolve?urn=urn:nbn:se:du-2346
titleInfo:
@attributes:
lang: swe
title: Kraftutveckling för manuella trädfällningsredskap
subTitle: Force development for manual tree felling tools
abstract: The objective with this study has been to build general models of the mechanics in tree felling with chain-saw and to compare felling torque for different tools. The theoretical models are completed and validated with a comparative study. The study includes a great number of felling tools of which some are used with different methods. Felling torque was measured using a naturally like measuring arrangement where a tree is cut at about 3.7 m height and then anchored with a dynamometer to a tree opposite to the felling direction. Notch and felling cut was made as ordinary with exception that the hinge was made extra thin to reduce bending resistance. The tree was consequently not felled during the trials and several combinations of felling tools and individuals could be used on the same tree.\n\nThe results show big differences between tools methods and persons. The differences were however not general but could vary depending on conditions (first of all tree diameters). Tools and methods that push or pull on the stem are little affected by the size of the tree while tools that press on the stump are very much dependent of a large stump-diameter. Hand force asserted on a simple pole is consequently a powerful tool on small trees. For trees of medium size there are several alternative methods with different sizes and brands of felling levers and wedges. Larger and more ungainly tools and methods like tree pusher winch etc. develop very high felling torque on all tree sizes. On large trees also the felling wedge and especially the use of several wedges together develop very high felling torque.
subject:
@attributes:
lang: swe
topic: Tree felling
@attributes:
lang: swe
topic: chain-saw
@attributes:
lang: swe
topic: felling tool
@attributes:
lang: swe
topic: felling equipment
@attributes:
lang: swe
topic: model
language:
languageTerm: swe
genre:
publication/report
vet
note:
Published
1
name:
@attributes:
type: personal
authority: du
namePart:
Gullberg
Tomas
role:
roleTerm: aut
affiliation:
Högskolan Dalarna
Träteknologi
nameIdentifier: tgu
originInfo:
dateIssued: 2006
publisher: Högskolan Dalarna
place:
placeTerm: Garpenberg
relatedItem:
@attributes:
type: series
titleInfo:
title: Rapport / Institutionen för matematik naturvetenskap och teknik
partNumber: 29
identifier: 1403-8188
location:
url: http://du.diva-portal.org/smash/get/diva2:523010/FULLTEXT01.pdf
accessCondition: gratis
physicalDescription:
form: electronic
typeOfResource: text