The behavior of tillage tools with acute and obtuse lift angles

  • Mohammad Hossein Abbaspour-Fard Dept. Agricultural Machinery Engineering. College of Agriculture. Ferdowsi Univ Mashhad. Mashhad
  • Sayed Ali Hoseini Dept. Agricultural Machinery Engineering. College of Agriculture. Ferdowsi Univ Mashhad. Mashhad
  • Mohammad Hossein Aghkhani Dept. Agricultural Machinery Engineering. College of Agriculture. Ferdowsi Univ Mashhad. Mashhad
  • Ahmad Sharifi Agricultural Engineering Research Institute (AERI). Karaj
Keywords: blade, draft force, lift angle, numerical prediction, soil bin

Abstract

An experimental investigation was conducted to study the trend of draft force against forward speed and working depth for a range of lift angles beyond acute angles for a simple plane tillage tool. The experiments were performed in an indoor soil bin facility equipped with a tool carriage and a soil preparation unit propelled by an integrated hydraulic power system. The system was also equipped with electronic instrumentation including an Extended Octagonal Ring Transducer (EORT) and a data logger. The factorial experiment (4×3×3) with three replications was used based on Randomized Complete Block Design (RCBD). The independent variables were lift angle of the blade (45, 70, 90 and 120°), forward speed (2, 4 and 6 km h-1) and working depth (10, 25 and 40 cm). The variance analysis for the draft force shows that all independent variables affect the draft force at 1% level of significance. The trend of the draft force against working depth and forward speed had almost a linear increase. However, the trend of the draft force against the lift angle is reversed for lift angles >90. This finding, conflicts with the results of analytical and numerical studies which extrapolate the results achieved for acute lift angles to obtuse lift angles and have not been reported experimentally.

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Published
2014-01-15
How to Cite
Abbaspour-FardM. H., HoseiniS. A., AghkhaniM. H., & SharifiA. (2014). The behavior of tillage tools with acute and obtuse lift angles. Spanish Journal of Agricultural Research, 12(1), 44-51. https://doi.org/10.5424/sjar/2014121-4437
Section
Agricultural engineering