Design Parameters of Four-shank Vibrating Subsoiler

To achieve effective subsoiling with a medium size tractor (30-45 kW), a four-shank vibrating subsoiler was developed. The design parameters of amplitude, frequency, and vibrating angle were determined by preliminary tests using a single-shank vibrating subsoiler. Considering those results, the amplitude of 50 mm, frequency of 3.4 Hz, and vibrating angle of 30 were determined to be suitable. This amplitude is much larger and frequency is much smaller than used on conventional vibrating subsoilers. The performance of the prototype four-shank vibrating subsoiler was evaluated in terms of draft reduction, power requirements, and riding comfort. More than 60% of draft reduction was obtained. For a certain vibrating condition, the power increment was only 2% of non vibrating power requirement. Tractor seat vibrations were minimized to acceptable levels by balancing oscillating soil cutting forces and moments.