From static to dynamic mechanical models of trees

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F24%3A43926538" target="_blank" >RIV/62156489:43410/24:43926538 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.swst.org/wp/wp-content/uploads/2024/08/SWST-2024-Final-Proceedings-Editor-copy.pdf" target="_blank" >https://www.swst.org/wp/wp-content/uploads/2024/08/SWST-2024-Final-Proceedings-Editor-copy.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

From static to dynamic mechanical models of trees

Popis výsledku v původním jazyce

The stability of trees plays a key role in determining the quality of forest plantation and urban forestry, particularly in light of the increasing frequency of wind gust events over the past few decades. Existing mechanical models, such as GALES or HWIND, address tree responses to wind using a simplified static approach. However, trees are a very complex structure living in a dynamic environment, its failure is dynamic too. Description of relationships between parameters describing trees and its response to dynamic loading can help to develop methods of tree stability assessment considering dynamics. Describing such a structure with heterogeneous material properties, complex geometry, and loading conditions requires a series of systematic tasks. The sub-tasks included: a) conducting extensive laboratory testing on green wood, leading to the development of relevant material models; b) observing the effect of simplification in geometry and load conditions on stems and branches to outputs of numerical mechanical analysis; c) experimental testing of trees with different conditions (with or without defects, pruning etc.); d) conducting numerical analysis of simplified models of trees, treating them as beams with representation of crown by mass elements; e) performing numerical analysis of more complex tree structures with realistic crown description; f) running simulations of &quot;what-if&quot; scenarios to observe the effect of internal defects to frequency response and damping. The results revealed trends in the change of frequency spectra and time domain response, based on the changes in mass, geometry, and material parameters. These trends were then compared with tree behavior in the static domain, allowing for a comprehensive evaluation of static and dynamic approaches. The outcomes of this extensive research provided valuable insights and conclusions that should be considered in future work on tree biomechanics.

Název v anglickém jazyce

From static to dynamic mechanical models of trees

Popis výsledku anglicky

The stability of trees plays a key role in determining the quality of forest plantation and urban forestry, particularly in light of the increasing frequency of wind gust events over the past few decades. Existing mechanical models, such as GALES or HWIND, address tree responses to wind using a simplified static approach. However, trees are a very complex structure living in a dynamic environment, its failure is dynamic too. Description of relationships between parameters describing trees and its response to dynamic loading can help to develop methods of tree stability assessment considering dynamics. Describing such a structure with heterogeneous material properties, complex geometry, and loading conditions requires a series of systematic tasks. The sub-tasks included: a) conducting extensive laboratory testing on green wood, leading to the development of relevant material models; b) observing the effect of simplification in geometry and load conditions on stems and branches to outputs of numerical mechanical analysis; c) experimental testing of trees with different conditions (with or without defects, pruning etc.); d) conducting numerical analysis of simplified models of trees, treating them as beams with representation of crown by mass elements; e) performing numerical analysis of more complex tree structures with realistic crown description; f) running simulations of &quot;what-if&quot; scenarios to observe the effect of internal defects to frequency response and damping. The results revealed trends in the change of frequency spectra and time domain response, based on the changes in mass, geometry, and material parameters. These trends were then compared with tree behavior in the static domain, allowing for a comprehensive evaluation of static and dynamic approaches. The outcomes of this extensive research provided valuable insights and conclusions that should be considered in future work on tree biomechanics.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

40102 - Forestry

Projekt

<a href="/cs/project/LL1909" target="_blank" >LL1909: Dynamika stromu: popis mechanické odezvy na zatížení</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů