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<p>Sugarcane lodging severely hampers mechanized harvesting. Existing research primarily focuses on agronomy, with limited investigation into the root-soil interaction mechanisms, which constrains the optimization of lodging resistance technologies. Numerical simulation offers a key approach for studying this problem. However, suitable modeling methods for the sugarcane root-soil system remain scarce. In this study, we first employ a SPH-FEM coupling method combined with physical experiments to propose a parameter-equivalence approach for root materials, thereby constructing a simulation model of the root-soil system during the sugarcane lodging period. Subsequently, through simulation experiment design, regression analysis, and parameter optimization, a mathematical relationship is established between the cross-sectional height dimension <i>h</i><sub><i>y</i></sub> of the fibrous roots and simulation time, as well as the simulation accuracy. The results indicate that the SPH-FEM coupled model for the root-soil system during the lodging phase is applicable to sugarcane lodging research. The optimal equivalence&#xa0;method for root elastic modulus is based on tensile deformation equivalence. As <i>h</i><sub><i>y</i></sub> increases, the simulation time first decreases rapidly and then levels off, while the simulation error increases slowly initially and then rise more sharply. Optimization yields a height of 6 mm, corresponding to the following material parameters: density 129.397 kg m<sup>−3</sup>, elastic modulus 110.927 MPa, and static and dynamic friction coefficients against the soil of 0.195 and 0.189, respectively. The proposed modeling method provides critical technical support for studying crop lodging and complex root-soil systems and facilitating in-depth research into crop-soil interaction mechanisms.</p>

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Research on the Modeling Method of the Lodging Period Sugarcane Root-Soil System Based on SPH–FEM Coupling Method

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • Wang Yang,
  • Xinkai Dang,
  • Zhiheng Lu,
  • Kuo Liao,
  • Chengni Pang,
  • Weilong Dai

摘要

Sugarcane lodging severely hampers mechanized harvesting. Existing research primarily focuses on agronomy, with limited investigation into the root-soil interaction mechanisms, which constrains the optimization of lodging resistance technologies. Numerical simulation offers a key approach for studying this problem. However, suitable modeling methods for the sugarcane root-soil system remain scarce. In this study, we first employ a SPH-FEM coupling method combined with physical experiments to propose a parameter-equivalence approach for root materials, thereby constructing a simulation model of the root-soil system during the sugarcane lodging period. Subsequently, through simulation experiment design, regression analysis, and parameter optimization, a mathematical relationship is established between the cross-sectional height dimension hy of the fibrous roots and simulation time, as well as the simulation accuracy. The results indicate that the SPH-FEM coupled model for the root-soil system during the lodging phase is applicable to sugarcane lodging research. The optimal equivalence method for root elastic modulus is based on tensile deformation equivalence. As hy increases, the simulation time first decreases rapidly and then levels off, while the simulation error increases slowly initially and then rise more sharply. Optimization yields a height of 6 mm, corresponding to the following material parameters: density 129.397 kg m−3, elastic modulus 110.927 MPa, and static and dynamic friction coefficients against the soil of 0.195 and 0.189, respectively. The proposed modeling method provides critical technical support for studying crop lodging and complex root-soil systems and facilitating in-depth research into crop-soil interaction mechanisms.