Today we release Pulling-test v1.8 with support for EN1991 based biomechanics. The new version is available form our Downloads page.
Manual
Video demonstration
Today we release Pulling-test v1.8 with support for EN1991 based biomechanics. The new version is available form our Downloads page.
We have received several reports from our users telling us that they cannot pair their ArborSonic3D with a Windows 11 PC.
The reason behind this is that Windows 11 has introduced a new Bluetooth setting that, on its default setting, prevents the pairing of classic Bluetooth devices.
To resolve this issue, please upgrade to ArborSonic3D 5.3.161: download the update from our Downloads section.
If, for some reason, you cannot perform the upgrade, follow these steps to resolve the issue manually:
Between January 17 and February 2, 2024 Fakopp Enterprise will host free training courses on instrumental tree assessment.
Registration
January 17
Acoustic tomography: Sound propagation in trees, possibilities and limitations
January 19
Acoustic tomography and biomechanics
January 22
Acoustic tomography for ArborSonic3D users, new features in the software
January 24
Pulling Test basics: Possibilities and limitations
January 26
Pulling test: The uprooting curve
January 29
Acoustic root detection
January 31
Dynamic version of the pulling test: DynaRoot and DynaTree
February 2
DynaRoot and DynaTree users’ meeting to share experience
The encircled Eucalyptus sp. tree was tested over several days at high wind velocity during February 2022 with DynaRoot dynamic root testing system. The tree is approximately 17 meters tall and has a diamater of 44 cm at breast height. The measurements were conducted in the United Kingdoms by Mr. James Chambers, Tim Moya Asssociates.
The image on the left shows the satellite image of the surrounding area of the measured tree. The red cross indicates the tree in question, while the yellow cross indicates the location of the wind anemometer. It is clearly visible that the tree is protected from the wind from the south, southwest and southeast by several large buildings, while completely exposed to the wind in any other direction.
Date | max. wind speed (km/h) | wind direction (degree) | Safety Factor | correlation |
Oct. 27 | 84 | 340 | 0.94 | 0.95 |
Feb. 18/1 | 113 | 208 | 3.96 | 0.94 |
Feb. 18/2 | 119 | 260 | 0.96 | 0.95 |
Feb. 18/3 | 53 | 243 | 1.24 | 0.72 |
Feb. 19/1 | 72 | 259 | 1.1 | 0.82 |
Feb. 19/2 | 68 | 221 | 2.89 | 0.76 |
Feb. 20 | 72 | 215 | 2.89 | 0.72 |
Feb. 20/1 | 94 | 281 | 0.92 | 0.85 |
Feb. 20/2 | 50 | 307 | 0.84 | 0.68 |
The table above shows the measured speed and the direction of the wind, with the corresponding Safety Factor calculated by the software. The results show that from protected directions (S,SW,SE) the Safety Factor is significantly higher. From unprotected directions (West ~ 260°, NW ~ 340°) the Safety Factor is below 1 which is deemed unsafe by the software. On the right the arrows indicate some of the wind directions.
The graph shows that after the change in wind direction (red line) the inclination measured on the tree became significantly higher.
Ultimately as the gathered data shows, the results of DynaRoot is highly influenced by wind direction. It is extremely important to always take the wind direction into consideration when evaluating DynaTree measurements. When a high Safety Factor is due to the tree being shielded from the wind (by other trees, buildings), it is recommended to repeat the measurement in unobstructed wind.
Intact: 1.19
Excavated: 0.86
1 root cut: 0.61
4 roots: 0.33
7 roots: 0.27
All 11 roots: 0.14
A Platanus occidentalis tree has been selected for examination in a botanical garden (Sopron, Hungary). First the measurement has been conducted with 12 regular sensors and then with an additional 12 Ludwig sensors.
The first measurement using 12 regular sensors shows a decayed area in the middle (about 40%).
The second measurement with additional Ludwig sensors shows a decayed area in the middle (about 32%), and also a strengthened area on the side near sensors 9-12.
The tree suffered a freeze injury several years ago. This is exactly the part where the strengthened wood has been found.