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.
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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.",
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author = "Timo Lappalainen and Veli-Juhani Aho and Juha K{\"a}rkk{\"a}inen",
year = "2001",
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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 -