LynFarm

Ver. 1.0 (July 2022)

LynFarm is developed for calculating asphalt pavement responses under the loadings of farming vehicles on tracks and/or flotation tires.

**The code has been developed at the Technical University of Denmark in Kongens Lyngby. Hence the name. **

LynFarm is an add-on to the ALVA MATLAB-package developed by Asmus Skar, Sebastian Andersen and Julius Nielsen for pavement modeling. Link to ALVA.

Read more about ALVA.

Figure 1: LynFarm roadmap on a timeline.

The components are in short described below:

• user_input.m - collects user inputs comprising of parameters about: the farming vehicle's geometry, the desired computational accuracy, and the linear elastic half-space resembling the pavement.

• main.m - is an executional file taking in the user's inputs and initiating a sequence of sub-procedures in the right order. In the end, the file gathers all information and provides the output. A plot of a specific response can optionally be chosen too.

• ALVA - This command initiates ALVA as a sub-routine.

• filling_function.m - runs a geometrical algorithm to fill a single rectangular patch with small identical micro-circles positioned in an intersecting yet non-overlapping lattice-like arrangement that optimally covers the patch's geometry.

• pavement_response.m & grid assembly.m- calculates the responses in a discrete half-space for a full farming vehicle by the means of interpolation and superposition algorithms. The discrete half-space is for presentation assembled as a finite 2D-grid containing many nodes. Each node contains the magnitudes of each response type. The grid assembly.m file collects each patch's contribution w.r.t. response magnitudes to each node element in the 2D-grid, and assembles it all onto a single common space.

• PLOT - This command is optional and can be turned on to construct and review a finite 2D-grid of a selected response for the farming vehicle once all calculations are done.

• OUTPUT - Last step in the code where results are presented in command window (and the plot is shown if selected to).

• Download LynFarm and ALVA on your PC. Link to ALVA.
• Make the LynFarm a sub-folder in the ALVA folder.
• Open MATLAB.
• Navigate to the LynFarm folder and open user_input.m to define a vehicle via geometry inputs.
• Launch the user_input.m script to initiate LynFarm.
• Optional: To run one of the example vehicles, open the examples folder and launch the script.
• LynFarm & ALVA are compatible with OCTAVE.

This version of LynFarm is not final and further work is continuously being done to improve the performance. Future versions are expected to be released.