关键词: 甜高粱；切割器；滚刀；ANSYS/LS-DYNA；模态分析；正交试验

Abstract:

Sweet sorghum rotor cutter has vital significance for cutting uniformity and sugar utilization of sweet sorghum stalks. Through analyzing the cutting principle of this rotor cutter, a finite element model was built based on ANSYS/LS-DYNA software in this paper. The result of model analysis indicated that the natural frequency of cutter blade was 1 908.7 Hz, which could avoid the resonance effect when the blades worked. This paper studied on the relation between the force received by blade and blade parameter during cutting. Using orthogonal experiment method, 3 factors were took  as the experiment indexes including forward velocity of harvester, angle of blade installation and rotate speed. The result showed that when cutting force is minimum, the blade installation angle is 140°，the rotate speed of rotor was 1 400 r/min，and the forward velocity of harvester was 4 km/h. This experiment provided basis for designing rotor cutter of sweet sorghum stalk.

Key words: sweat sorghum, hobbing cutter, ANSYS/LS-DYNA, modal analysis, orthogonal test