Invitation for the Winter course on instrumental tree assessment
Lecturer: Dr. Ferenc Divos, owner of Fakopp Enterprise Bt. and professor at the Hungarian University of Agriculture and Life Sciences
Language: English
Duration: 1 hour each lecture
Time: Each lecture is presented twice a day with the same content: 9 AM and 4 PM Central European time/ OR 8am GMT / 3pm GMT. You are free to choose between these two.
Cost: free, but registration is necessary
Registration: send an e-mail to Ms. Blanka Teleki: blankateleki@fakopp.com indicating the lecture
you are interested in, and the starting time (9 AM CET or 4 PM CET) Or 8am GMT or 3pm GMT.
January 17
Acoustic tomography: Sound propagation in trees, possibilities and limitations
- Mechanical waves in solids, longitudinal (p), transverse (s) and surface waves
- Effect of anatomical orientation, radial, tangential, fiber direction
- Single path stress wave approach, decay/cavity detection
- 2D acoustic tomography, self-calibration, inversion algorithm
- 3D acoustic tomography
- limitations: acoustic shortcut, ring shake, deep crack visualization
January 19
Acoustic tomography and biomechanics
- Interpretation of acoustic tomographic image, biomechanical interpretation
- Mechanical stresses in tree: compression, bending and shear
- Wind load calculation
- Bending stress from wind load and tree leaning
- Compression stress from self-load
- Safety factor calculation and interpretation
January 22
Acoustic tomography for ArborSonic3D users, new features in the software
- Ludwig sensors
- GPS data
- Controlling the self-calibration algorithm
- New warning in case of low velocities
- Low Energy Bluetooth capabilities for new hardware
- Limitation in the Android software
January 24
Pulling Test basics: Possibilities and limitations
- Pulling test inclino-method for root investigation
- Pulling test elasto-method for trunk investigation
- Evaluating the correctness of the fit between the measured and generalized
uprooting curve
- Reasons for a poor fit (wind, loose inclinometer, too fast pulling, root failure)
- Correction of the raw data in case of a poor fit
January 26
Pulling test: The uprooting curve
- Importance of the root investigations, failure mode statistics: breakage of trunk versus uprooting failure
- Principle of the pulling test
- How many inclinometers are necessary?
- Uprooting curve, uprooting test
- Verification of the uprooting curve
- Lower limit of the minimum inclination for a measurement to be meaningful
- Upper limit of the inclination during the measurement
- Effect of the soil moisture content on the safety factor
January 29
Acoustic root detection
- Principle of the acoustic root detection
- The acoustic root detection procedure
- Velocity limit setting
- Distance between test points
- Visualization of the result
- Recommended application and limitation
January 31
Dynamic version of the pulling test: DynaRoot and DynaTree
- Pulling test limitations: static/dynamic load, anchor point availability, vertical load
- Solution: Using wind as loading “device” and consequences
- Requirements for sensors
- Chaotic nature of wind and tree interaction
- Statistical window width
- Visualization of the test result
- Safety factor calculation
February 2 -Note anyne can attend
DynaRoot and DynaTree users' meeting to share experience
- Case studies indicating of the importance of
a.) wind direction
b.) location of the anemometer
c.) the minimum wind speed requirement
- We are inviting feedback from DynaRoot/DynaTree users:
a.) short user presentation about interesting/strange test result: a short PowerPoint
presentation or simple explanation of the experience
b.) organization of the workflow with regards to wind dependencies c.) finding good/acceptable anemometer location