STARTING TRACTION EFFORT EVALUATION FOR A SIMPLE TILLAGE TOOL

The paper presents an experimental study on the evaluation of the maximum draft force in the transient operation from standstill to constant working speed of a tillage tool with simple geometry. Experiment was performed in laboratory conditions in a soil-bin with washed and sorted quartz sand (0.3 mm grain diameter) a test environment without structure and cohesion. The measurements were made at a depth of 0.'5, 0.20 and 0.25 meters at three rake angles of 25, 35 and 50 degrees and a constant velocity of 0.67 m/s. Results show that the starting force is 26-58% higher compared to the average drag force.