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, Model
Publication year: 2006
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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. 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
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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