Authors

Abstract

Mechanical weeding in paddy fields is a green and environmentally friendly way to control weeds, which has the advantages of reducing the amount of pesticides and improving the physical structure of the soil. This paper briefly describes the composition and relevant parameters of the mechanical weeding environment in rice fields. Using Creo 5.0, HyperMesh 2017, and LS-PrePost and LS-DYNA software to jointly simulate the interaction process between inverted V-shaped inter-plant weeding component and the soil in the paddy field, the single-point ALE multi-material unit algorithm is used to couple the soil and water with multiple substances, and realize the material movement between the soil and the water layer. Using the penalty function method, a fluid-solid coupling finite element modelled on the interaction between inter-plant weeding components and soil-water was established. The dynamic behavior of the interactions shows that the coupling stress increases and then decreases periodically, and the teeth of the spring cross the soil with a "bending moon (fish scale)" scratch, which can effectively avoid rice seedlings and reduce the injury rate.

Abstract in English

稻田机械除草是一种绿色环保的控草方式，具有降低农药用量、改善土壤物理结构等优点。本文首先，简要介绍了稻田机械除草环境组成及相关参数。然后，运用Creo 5.0、HyperMesh 2017和LS-PrePost及LS-DYNA软件联合模拟了稻田株间除草部件与土壤的互作过程，其中，采用单点ALE多物质体单元算法，对土壤与水进行多物质耦合，实现了在株间除草部件扰动下土壤与水层间的物质运动；运用罚函数法建立了株间除草部件与土壤-水互作的流固耦合有限元模型。最后，对稻田株间除草部件与土壤的互作过程进行了应力场与流场分析，以期加快推进稻田机械化除草进程。