How do branches and leaves affect the vibration of standing trees?

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K06123
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 40010:Forest science-related
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: Matsumoto Takeshi 東京農工大学, (連合)農学研究科(研究院), 准教授 (40555869)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 振動モード / 多点同時計測 / システム開発

Outline of Final Research Achievements

In order to clarify the vibration characteristics of standing trees and the influence of branches and leaves when subjected to wind or forced vibration, a system is required to simultaneously measure the vibration generated in the standing tree at each part. In addition, when measuring multiple standing trees at the same time, more measuring systems are required. In this study, I developed an inexpensive measurement system to replace the expensive system on the market, and made it possible to simultaneously measure the vibration generated in each part of multiple standing trees.
Furthermore, in order to reliably evaluate the effects of branches and leaves, it is a reliable method to generate the same vibration and compare with and without branches and leaves. However, it is difficult to control the vibrations mainly caused by the wind under natural conditions. Therefore, we developed a method to apply constant forced vibration to standing trees.

Free Research Field

森林科学

Academic Significance and Societal Importance of the Research Achievements

本研究では立木の各部位に生じる振動を同時に計測かつ，安価に製造可能なシステムを開発した。本システムにより複数の立木の各部位に生じる振動も同時に計測が可能となった。本システムにより，落葉・着葉，剪定前後の振動モードの変化を把握することが可能となる。このことは，都市緑地，街路樹，民家周辺の立木や樹林帯等の振動を指標とした施業・剪定・管理指針の策定につながる。