基于ANSYS/LS-DYNA的滚刀式甜高粱切割器动力学仿真

Dynamic Simulation of Sweet Sorghum Cutting Based on ANSYS/LS-DYNA

甜高粱茎秆切割装置的研究,对于提高其割茬整齐度和糖份利用率均有重要意义。通过分析滚刀式切割器切割原理,基于ANSYS/LS-DYNA软件建立甜高粱茎秆切割装置有限元模型,模态分析结果显示,刀片的固有频率为1 908.7 Hz,能够避免滚刀高速旋转情况下动刀片共振情况的发生。研究甜高粱切割过程中刀片的受力情况与动刀片参数的关系,以整机前进速度、刀片安装角度和滚刀转速为3个因素,以切割力为试验指标,利用正交试验的方法,得出当刀片切割力最小时,刀片安装角度为140°,滚刀转速为1 400 r/min,整机前进速度为4 km/h,为甜高粱茎秆切割装置的研究提供依据。

Sweet sorghum rotor cutter has vital significance ibr cutting uniibrmity 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.