Cyclic variation in moldboard plow draft and its effect on implement control systems
1991; Elsevier BV; Volume: 21; Issue: 3-4 Linguagem: Inglês
10.1016/0167-1987(91)90025-s
ISSN1879-3444
AutoresNingombam Thoiba Singh, Gajendra Singh, V. M. Salokhe,
Tópico(s)Agricultural Engineering and Mechanization
ResumoThe cyclic variation in a moldboard plow draft was studied to assess the response of the tractor draft control system. The experiments were conducted using a 32-cm Ransom mounted moldboard plow in heavy clay soil at a field moisture content of 24% dry basis (d.b). The tests were conducted in two implement control modes, i.e. depth of working and draft control. Three speeds, i.e. 0.45, 0.65 and 0.90 m s−1, and two depths of operation, 24 and 29 cm, were used to determine their effect on cyclic variation of draft. A cyclic variation in the plow draft was observed to show definite peak and trough values. The fracture length remained almost the same, i.e. 1 ± 0.2 m at all plowing speeds and depths. The total draft frequency range was divided into two groups. The lower frequency range corresponded to the actual soil failure frequency, whereas the higher frequency corresponded to the frequency of failure of soil mass over the moldboard surface into smaller sub-blocks. It was observed that the response of the draft control system was affected by the lower frequencies of the draft. The performance of the draft control system was better in low-speed third gear than in low first or second gear as the lower frequencies of the draft corresponded to the system response.
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