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Partial modal analysis for health assessment of living trees

Axmon, Joakim LU ; Sandsten, Maria LU and Sörnmo, Leif LU (2001) 10th Asia-Pacific Conference on Non-Destructive Testing
Abstract
Rot in living trees cause substantial losses for the forestry industry. The common practice when evaluating forest stands for, e.g., purchase, is assessment based on visual signs. In this paper a new non-destructive assessment method based on the impact excitation method is proposed. The trunk of a living tree is excited by the impact of a hammer, and the vibrations are measured by accelerometers. Resonance frequencies, circumferential mode shapes and propagation velocity of a surface wave are analysed. A function describing the expected frequency for a sound tree is derived, and used in a detector whose performance is evaluated for 93 trees of species Norway spruce. The partial mode shape is used to ensure that the corresponding resonance... (More)
Rot in living trees cause substantial losses for the forestry industry. The common practice when evaluating forest stands for, e.g., purchase, is assessment based on visual signs. In this paper a new non-destructive assessment method based on the impact excitation method is proposed. The trunk of a living tree is excited by the impact of a hammer, and the vibrations are measured by accelerometers. Resonance frequencies, circumferential mode shapes and propagation velocity of a surface wave are analysed. A function describing the expected frequency for a sound tree is derived, and used in a detector whose performance is evaluated for 93 trees of species Norway spruce. The partial mode shape is used to ensure that the corresponding resonance frequencies are compared to each other. It is found that the detector is successful and outperforms assessments by skilled experts in forestry. (Less)
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publication status
published
subject
host publication
Asia-Pacific conference on non-destructive testing (APCNDT)
publisher
AINDT
conference name
10th Asia-Pacific Conference on Non-Destructive Testing
conference location
Brisbane, Australia
conference dates
2001-09-17 - 2001-09-21
language
English
LU publication?
yes
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b4dc555e-5d24-4cae-bc55-caa7eb9604de
date added to LUP
2018-03-23 16:01:32
date last changed
2018-11-21 21:38:53
@inproceedings{b4dc555e-5d24-4cae-bc55-caa7eb9604de,
  abstract     = {Rot in living trees cause substantial losses for the forestry industry. The common practice when evaluating forest stands for, e.g., purchase, is assessment based on visual signs. In this paper a new non-destructive assessment method based on the impact excitation method is proposed. The trunk of a living tree is excited by the impact of a hammer, and the vibrations are measured by accelerometers. Resonance frequencies, circumferential mode shapes and propagation velocity of a surface wave are analysed. A function describing the expected frequency for a sound tree is derived, and used in a detector whose performance is evaluated for 93 trees of species Norway spruce. The partial mode shape is used to ensure that the corresponding resonance frequencies are compared to each other. It is found that the detector is successful and outperforms assessments by skilled experts in forestry.},
  author       = {Axmon, Joakim and Sandsten, Maria and Sörnmo, Leif},
  booktitle    = {Asia-Pacific conference on non-destructive testing (APCNDT)},
  language     = {eng},
  publisher    = {AINDT},
  title        = {Partial modal analysis for health assessment of living trees},
  year         = {2001},
}