Advertisement
Quick Links
Advertisement
Related Manuals for Fakopp DynaRoot
Summary of Contents for Fakopp DynaRoot
- Page 1 Manual for the DynaRoot and DynaTree evaluation system 9 May 2025...
- Page 2 Anemometer setup ........................15 Elastometer setup ........................16 Transferring data from the SD card to a different device ............17 Analysis using the DynaRoot-DynaTree software ..............18 Transferring data wirelessly on Windows ................25 Introduction The stability of urban trees is a key question that affects everyone. Diseased and unstable urban trees pose much risk for everyone and are a serious liability for municipalities in case of an accident.
- Page 3 The pulling test Figure 1 Schematic of the pulling test The pulling test is based on affixing a cable at approximately mid-height on the tree to be evaluated, and applying a moderate load, while measuring the inclination at the root collar. The induced inclination is very moderate (less than .25 degrees), to make sure that the test itself does not damage the tree and the roots.
- Page 4 The DynaTree dynamic root evaluation system It would be much simpler to use the loads that arise from the actual wind rather than a loaded cable to assess the tree’s safety in a high wind situation. There are, however, two interrelated problems that makes this very complicated: 1.
- Page 5 1. Anemometer; an instrument for measuring wind velocity at or near the tree to be evaluated. The closer to the better, but, depending on wind velocity DynaRoot may provide reliable data even with measurements taken several kilometers / miles away. The anemometer provides wind velocity data of sufficient frequency (1 Hz).
- Page 6 How does DynaTree work? DynaTree system consists of four components (see Figure 4), three of which is identical with those of DynaRoot. The three components will only be listed below. 1. Anemometer 2. Inclinometer 3. Evaluation software 4. Elastometer; an instrument attached to the trunk for measuring the micro deformations.
- Page 7 Conditions for conducting the measurement Reliability and validity of test results DynaRoot and DynaTree results are based on statistical evaluation, hence we face statistical fluctuation in the results. Please be aware these tests are not 100% perfect, however a review of testing results has shown a 99.5% reliability in the Safety Factor calculation.
- Page 8 User errors The DynaRoot & DynaTree systems are relatively straightforward and data collection is systematic. Provided the guidelines in the manual are followed, the safety factor can be calculated. However, care and consideration are required to provide a representative safety factor. Below are the key oversights and errors by users that are often overlooked and which we cannot rectify or be responsible for: 1.
- Page 9 7. It is a user error to position the anemometer in the wrong place: wind channel (red area on left figure), or in a vortex zone (right figure) – Ensure the anemometer is well-positioned, with no wind channel and turbulence/ vortex effects. 8.
- Page 10 25 km/h and 35 km/h maximal wind gust velocity. The minimum average wind velocity is 12.5 km/h. Figure 7 An important condition for DynaRoot to be applicable is a sufficiently large wind speed...
- Page 11 Statistical approach As mentioned before, instead of using momentary wind velocity and inclination data, values are collected over a longer period (3 hours is recommended), and several minutes’ worth of information is evaluated statistically. The accuracy of the data (the tightness of the correlation) depends on the time interval.
- Page 12 Crown area, drag factor and Only critical wind speed required critical wind speed required Weather conditions Wind speed < 25 km/h Wind speed > 25 km/h Table 1: Comparison of the DynaRoot and DynaTree system and the traditional pulling test...
- Page 13 System components Anemometer • Sampling rate: 1 Hz • Measurement range: 0-150 km/h • Accuracy: 0.2 km/h • Integrated GPS • Data storage capacity: 16 GB (SD card) • Best location: open field, 10 m height, undisturbed by buildings or other large objects •...
- Page 14 Dyna software • Simple yet efficient software for determining the safety factor • Automatic merging of wind velocity, extension, and inclination data • Diagram, critical wind pressure, correlation coefficient and safety factor calculation • Runs under Microsoft Windows...
- Page 15 Operation guide Dyna system should be used on days with at least 25 km/h (15 mph) wind gust velocities. Setting up the measurement involves mounting the inclinometer(s) on the tree(s) root collar to be assessed and erecting the anemometer in the vicinity of the trees, within 1.5 km if possible. In case of DynaTree the elastometers should be placed on the tree at 90 degrees relative to the pith.
- Page 16 • Record data for a suitably long period of time (the longer the better, 3 hours recommended with high enough winds). • Hit STOP on the control panel and wait for the recording to finish. • Transfer the data from the SD card to a different device for further processing (see subsection for more instructions) via Wi-Fi.
- Page 17 Elastometer setup Mount the first elastometer on the tree trunk. Try to select the weakest region (based on visual inspection.) Screw in the top (2) and bottom (6) screws without releasing the securing jaws. Then loosen the thumb screw (4) and slide up the collar (3) to release the jaws (5) and thus allow the elastometer to move freely.
- Page 18 Transferring data from the SD card to a different device During the data acquisition phase, several files are created on the SD card of your inclino- or anemometer. The DynaTree evaluation software will automatically know how to interpret the format of these files so there is no need to do any preliminary conversions.
- Page 19 PC that runs Microsoft Windows and the DynaRoot-DynaTree software has been installed. After starting the program, first enter the Options menu by clicking on the top left corner. See Figure 11 for a screenshot of the menu. This is where you can choose your language (default is English) and turn DynaTree function on.
- Page 20 After returning to the data window (see Figure 12), you can specify the location of the tree (optional), and the location of the source data. First, you need to select the type of anemometer. Currently, there are seven types of anemometers included in the software (see Figure 13). Use the folder button on the right to select the location of the wind velocity and the inclination data folder.
- Page 21 Finally, after entering all the information, hit the “Select range” button. For range selection, the “Charts” page of the software is shown. Figure 15 The “Charts” window In “Charts” page, the measured wind, inclination and (if elastometers used) strain are visualized. You can inspect the value of the measured data points by moving the red line.
- Page 22 The slide on the top (with the two white rectangles) is used to select the evaluation time range. The dates and times of the beginning and the end of the selection is shown above the slider rectangles. The duration of the range is shown in the format “hours: minutes: seconds” above and between the two sliders.
- Page 23 The first icon under the text “Charts” is for selecting the data to visualize. Figure 19 Wind speed, inclinometer and elastometer data can be turned on and off. As both inclination and elongation are measured on dual axes, the separated axes (like x or y directions) can also be presented.
- Page 24 The evaluation window (see Figure 19) displays the location of the tree, which you can also verify in Google Maps by clicking the Show in browser link. The software displays the average wind direction, the starting time and duration of the measurement, and the statistical window length. Figure 20 The evaluation window...
- Page 25 The measured wind velocity (converted to wind pressure) and inclination data points are displayed in a diagram, along with the line fitted on the values. You will typically see only a small section of the curve that looks linear. The software calculates the critical wind pressure and its error and the correlation coefficient.
- Page 26 Figure 43 shows the connection setup dialog of Total Commander. 1. Press the icon located in the icon bar. 2. Press “New connection”. 3. Fill out the appropriate input fields with the following information: Session: dynaroot Host name: 192.168.4.1 User name: ddar Password: ddar9876 4.
- Page 27 5. Press the icon again, select “dynaroot” from the list of saved connections and press “Connect”. If the authentication was successful then the content of the SD card will be visible in one of the panes of Total Commander. Figure 24 At first, press the “FTP” icon, then press “New connection” and finally, fill out the input fields in the “FTP connection details”...
Need help?
Do you have a question about the DynaRoot and is the answer not in the manual?
Questions and answers