Partial modal analysis for health assessment of living trees
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/b4dc555e-5d24-4cae-bc55-caa7eb9604de
- author
- Axmon, Joakim LU ; Sandsten, Maria LU and Sörnmo, Leif LU
- organization
- publishing date
- 2001
- type
- Chapter in Book/Report/Conference proceeding
- 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
- id
- 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}},
}