Experiments were conducted with a single powered disk in a laboratory soil bin containing Bangkok clay soil with an average moisture content of 18 % (db) and 1100 kPa cone index. The disk was 510 cm in diameter and 560 mm in radius of concavity. During the tests the disk angle was varied from 20 deg to 35 deg, ground speed from 1 to 3 km/h and rotational speed from 60 to 140 rpm. The working depth was kept constant at 12 cm. The vertical, horizontal and lateral reactions of the soil were measured by force transducers. The forward and rotational speeds were recorded. It was observed that disk angle, rotational speed and ground speed had significant effects on soil reactive forces and power requirement. With a small disk angle, low ground speed and high rotational speed, the soil longitudinal reactive force was a pushing force and became a resistive one at larger disk angles and ground speeds. The soil transverse reactive force increased with an increase of rotational and ground speed but decreased with the increase of disk angle, whereas the vertical relative force increased only with the increase of ground speed but decreased with the increase of rotational speed and disk angle. It was found that the powered disk required the least power at a disk angle of 30 deg and rotational speed between 80 and 100 rpm. Increase in the ground speed from 1 to 3 km/h increased the total power requirement by 31.8 %. Upon driving the disk forward, the draft reduced considerably compared to that of the free-rolling disk. By driving the disk in the reverse direction, the draft reduced slightly. At a disk angle of 30 deg, rotational speed of 100 rpm, and ground speed of 3 km/h, the total power requirement of the forward-driven disk was 65 % higher than that of the free-rolling disk. The predicted engine power of the forward-driven disk, however, was only 21 % than that of the free-rolling one.
Dynamics of a powdered disks in clay soil
Die Dynamik angetriebener Scheiben in lehmigem Boden
Journal of Terramechanics ; 32 , 5 ; 231-244
1995
14 Seiten, 13 Bilder, 13 Quellen
Aufsatz (Zeitschrift)
Englisch
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