Abstract When the harvester cuts the sugarcane, the forces acting on the cutter blade surfaces and the sugarcane roots are unclear, which is not conducive to further clarify the cutting mechanism of sugarcane and the role of the roots in the cutting process, as well as reduce the stubble damage rate. This paper aimed at: (1) verifying the rationality of the modeling method of sugarcane cutting system based on FEM and SPH coupling algorithm by the physical tests; (2) studying the forces acting on the blade surfaces, and the stress and role of the roots by using the established simulation model. The results show that the modeling method of sugarcane cutting system is reasonable. In the sugarcane cutting, the maximum normal force on the bevel and lower plane of the blade are large, they are 337 N and 273 N, respectively. The maximum horizontal tensile stress of the right roots on the upper, middle and lower layer are 0.92, 0.44 and 0.068 MPa, respectively, while the left roots are 0.85, 0.37 and 0.062 MPa, respectively. And reducing the friction coefficient between the bevel or the lower plane of the blade and sugarcane by anti-friction measures can effectively reduce the cutting resistance due to friction. When cutting sugarcane, the upper roots have the greatest fixation effect on sugarcane. Studying the forces of the blade surfaces and roots by the simulation method is of great significance for further exploring new method to reduce the cutting resistance and the stubble damage rate.

中文翻译：

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使用 FEM 和 SPH 耦合方法模拟作用在甘蔗刀片表面和根系上的力

摘要 收割机切割甘蔗时，作用在刀刃表面和甘蔗根部的受力不明确，不利于进一步阐明甘蔗的切割机理和根部在切割过程中的作用，减少残茬损坏率。本文旨在：(1)通过物理试验验证基于有限元和SPH耦合算法的甘蔗切割系统建模方法的合理性；(2)利用建立的仿真模型研究作用在叶片表面的力，以及根部的应力和作用。结果表明甘蔗切割系统的建模方法是合理的。在甘蔗切割中，刀片斜面和下平面上的最大法向力较大，分别为337 N和273 N。上、中、下层右根的最大水平拉应力分别为0.92、0.44和0.068 MPa，左根分别为0.85、0.37和0.062 MPa。并通过减摩措施降低刀片斜面或下平面与甘蔗的摩擦系数，可有效降低因摩擦引起的切割阻力。切甘蔗时，上根对甘蔗的固定作用最大。通过模拟方法研究叶片表面和根部的受力，对于进一步探索降低切削阻力和留茬损伤率的新方法具有重要意义。并通过减摩措施降低刀片斜面或下平面与甘蔗的摩擦系数，可有效降低因摩擦引起的切割阻力。切甘蔗时，上根对甘蔗的固定作用最大。通过模拟方法研究叶片表面和根部的受力，对于进一步探索降低切削阻力和留茬损伤率的新方法具有重要意义。并通过减摩措施降低刀片斜面或下平面与甘蔗的摩擦系数，可有效降低因摩擦引起的切割阻力。切甘蔗时，上根对甘蔗的固定作用最大。通过模拟方法研究叶片表面和根部的受力，对于进一步探索降低切削阻力和留茬损伤率的新方法具有重要意义。