Calculation of the power requirement for soil cutting by rotary tool blade

Abstract

Abstract The tilling specific energy requirement can be reduced by optimizing design and operating parameters of the rotary tillage tools of rotary tillage machines. The objective of this study was to develop a technique for calculation the power requirement for soil cutting by a blade of the previously proposed rotary tillage tool as function of the rotation angle and the parameters of the rotary tool. The power requirement dependence on this angle and on two dimensionless parameters, the relative depth and the kinematic parameter, was obtained and analyzed. It was shown that the instantaneous power requirement changes its magnitude periodically with the change of the rotation angle. The computational experiment has shown, that instantaneous and maximum dimensionless powers requiring for soil cutting by the blade monotonically increase with the increase of relative depth. In the range of variation of the kinematic parameter from 3 to 5, when the relative depth is doubled, the maximum instantaneous power requirement increases by 1.5-1.6 times, and when it is tripled, the maximum instantaneous power requirement increases by 1.9–2.3 times. The obtained formula can be used for optimizing the constructive and the functional parameters of the rotary tool. Due to the generality of the basic assumptions, the technique can be mainly transferred to other rotary tillage tools as well.