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《Transactions of The Chinese Society of Agricultural Engineering》 2002-03
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Grass Sliding Cutting Angles and Their Equations of Oblique Rotary Blades

Ding Weimin, Xu Zhigang, Wang Xiaohan (Nanjing Agricultural University, Nanjing 210031, China)  
The grass slidin cuttig angles of oblique rotary blades are analyzed and it is pointed out that, the static grass slidin cuttig angle of oblique rotary blade is the same as that of normal rotary blade, the dynamic grass slidin cuttig angle of lengthwise edge of oblique rotary blade is the angle between velocity vector and normal plane of the edge curve, and there is not a definite decrement  Δ τ between the dynamic and the static grass slidin cuttig angles. The equations of grass slidin cuttig angles of oblique rotary blades are also derived, and it is easy to see that the normal rotary tillage is only a special case of the oblique rotary tillage. Calculation result shows that the dynamic grass slidin cuttig angle of sidelong edge of oblique rotary blade is smaller than that of normal blade, but the magnitude of dynamic grass slidin cuttig angle of lengthwise edge changes of normal rotary blade. For both sidelong and lengthwise edge of the oblique rotary blade, the dynamic grass slidin cuttig angle is always smaller than the static grass slidin cuttig angle.
【Fund】: 教育部“高等学校骨干教师资助计划”项目
【CateGory Index】: S222.3
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