Analysis of the chain-flail debarking using a high speed motion analysis system

Timo Lappalainen, Veli-Juhani Aho, Juha Kärkkäinen

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    Abstract

    Chain-flail delimbing-debarking technology is suitable for multi-tree processing of small-diameter trees. In the chain-flail debarking process, the rotation speed of the chain drum ranges 300-500 rpm. Therefore, a high-speed motion analysis is the only method to show what really happens in the debarking process. In this study, it was noticed that debarking occurs in a very short time (about 0.5 ms) when the chain hits the timber. If the chain hits the side of the tree, the chain just slides on the surface of the tree and is not able to debark the tree efficiently. In the determination of the impact force there is a clear correlation between the results obtained by a load cell mounted at the hitting point of the chain and those calculated using the impact time determined with a high-speed motion analysis system. This information makes it possible to determine the maximum impact force of the chain without measuring it.
    Original languageEnglish
    Pages (from-to)195-200
    Number of pages6
    JournalHolz als Roh- und Werkstoff
    Volume59
    Issue number3
    DOIs
    Publication statusPublished - 2001
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    flails
    systems analysis
    delimbing
    Timber
    drums (equipment)
    tree and stand measurements
    timber
    Processing
    analysis
    speed
    Motion analysis
    cells

    Keywords

    • trees
    • delimbing
    • debarking
    • analysis
    • image analysis
    • image processing
    • chains
    • hitting force
    • impact force

    Cite this

    Lappalainen, Timo ; Aho, Veli-Juhani ; Kärkkäinen, Juha. / Analysis of the chain-flail debarking using a high speed motion analysis system. In: Holz als Roh- und Werkstoff. 2001 ; Vol. 59, No. 3. pp. 195-200.
    @article{86959fa089ef442da279f3d5acdcbb86,
    title = "Analysis of the chain-flail debarking using a high speed motion analysis system",
    abstract = "Chain-flail delimbing-debarking technology is suitable for multi-tree processing of small-diameter trees. In the chain-flail debarking process, the rotation speed of the chain drum ranges 300-500 rpm. Therefore, a high-speed motion analysis is the only method to show what really happens in the debarking process. In this study, it was noticed that debarking occurs in a very short time (about 0.5 ms) when the chain hits the timber. If the chain hits the side of the tree, the chain just slides on the surface of the tree and is not able to debark the tree efficiently. In the determination of the impact force there is a clear correlation between the results obtained by a load cell mounted at the hitting point of the chain and those calculated using the impact time determined with a high-speed motion analysis system. This information makes it possible to determine the maximum impact force of the chain without measuring it.",
    keywords = "trees, delimbing, debarking, analysis, image analysis, image processing, chains, hitting force, impact force",
    author = "Timo Lappalainen and Veli-Juhani Aho and Juha K{\"a}rkk{\"a}inen",
    year = "2001",
    doi = "10.1007/s001070100192",
    language = "English",
    volume = "59",
    pages = "195--200",
    journal = "European Journal of Wood and Wood Products",
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    Analysis of the chain-flail debarking using a high speed motion analysis system. / Lappalainen, Timo; Aho, Veli-Juhani; Kärkkäinen, Juha.

    In: Holz als Roh- und Werkstoff, Vol. 59, No. 3, 2001, p. 195-200.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Analysis of the chain-flail debarking using a high speed motion analysis system

    AU - Lappalainen, Timo

    AU - Aho, Veli-Juhani

    AU - Kärkkäinen, Juha

    PY - 2001

    Y1 - 2001

    N2 - Chain-flail delimbing-debarking technology is suitable for multi-tree processing of small-diameter trees. In the chain-flail debarking process, the rotation speed of the chain drum ranges 300-500 rpm. Therefore, a high-speed motion analysis is the only method to show what really happens in the debarking process. In this study, it was noticed that debarking occurs in a very short time (about 0.5 ms) when the chain hits the timber. If the chain hits the side of the tree, the chain just slides on the surface of the tree and is not able to debark the tree efficiently. In the determination of the impact force there is a clear correlation between the results obtained by a load cell mounted at the hitting point of the chain and those calculated using the impact time determined with a high-speed motion analysis system. This information makes it possible to determine the maximum impact force of the chain without measuring it.

    AB - Chain-flail delimbing-debarking technology is suitable for multi-tree processing of small-diameter trees. In the chain-flail debarking process, the rotation speed of the chain drum ranges 300-500 rpm. Therefore, a high-speed motion analysis is the only method to show what really happens in the debarking process. In this study, it was noticed that debarking occurs in a very short time (about 0.5 ms) when the chain hits the timber. If the chain hits the side of the tree, the chain just slides on the surface of the tree and is not able to debark the tree efficiently. In the determination of the impact force there is a clear correlation between the results obtained by a load cell mounted at the hitting point of the chain and those calculated using the impact time determined with a high-speed motion analysis system. This information makes it possible to determine the maximum impact force of the chain without measuring it.

    KW - trees

    KW - delimbing

    KW - debarking

    KW - analysis

    KW - image analysis

    KW - image processing

    KW - chains

    KW - hitting force

    KW - impact force

    U2 - 10.1007/s001070100192

    DO - 10.1007/s001070100192

    M3 - Article

    VL - 59

    SP - 195

    EP - 200

    JO - European Journal of Wood and Wood Products

    JF - European Journal of Wood and Wood Products

    SN - 0018-3768

    IS - 3

    ER -