Effect of Knife Velocity on Cutting Energy and Efficiency during Impact Cutting of Sorghum Stalk
Effect of Knife Velocity on Cutting Energy and Efficiency during Impact Cutting of Sorghum Stalk
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发表时间：
2005-12
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通讯作者：
Y. D. Yiljep;U. Mohammed
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作者：
Y. D. Yiljep;U. Mohammed
设计并制作了一种用于测量高粱茎秆切割能耗和切割效率的实验台。将高粱茎杆固定在茎杆保持器中以模拟田间的独立茎杆。将以30%斜角锐化的刀片连接到臂的下端，其以高达8.5m/s的刀速度以与茎轴成90 °切割茎。试验在高粱茎秆基部（20 mm）和茎秆离地高度（120 mm）下进行。结果表明，切刀速度、切割能量需求与切割效率之间存在高度相关性p≤0.1。切割能量需求与刀重、秸秆含水率呈负线性相关，切割效率与各参数呈正线性相关。20和120 mm的最小切割能量要求分别为7.87和12.55 Nm，相应的刀速为2.91和3.54 m/s。在刀速为5.2和7.3m/s时，最大切割效率分别为98%和97%。
A laboratory test-rig consisting of a pendulum-like oscillating arm was designed and fabricated for measuring cutting energy requirement and cutting efficiency on sorghum stalk. The sorghum stalk was fixed in a stalk holder to simulate a free-standing stalk in the field. A blade, sharpened at 30% bevel angle, was attached to the lower end of the arm which cut the stalk at 90o to the stalk axis with knife velocities up to 8.5m/s. The experiment was conducted during cutting of sorghum stalk base (20 mm) and stalk height (120mm) above the ground level. The results showed that there was high correlation p≤0.1 between knife velocity, cutting energy requirement and cutting efficiency. Cutting energy requirement showed negative linear correlation with knife weight and stalk moisture content with cutting efficiency showing positive linear correlation with the parameters. The minimum cutting energy requirements for 20 and 120 mm were 7.87 and 12.55 Nm respectively, at corresponding knife velocities of 2.91 and 3.54 m/s. The maximum cutting efficiencies were 98 and 97% at 5.2 and 7.3m/s knife velocities, respectively.