A Combined Paddy Field Inter-Row Weeding Wheel Based on Display Dynamics Simulation Increasing Weed Mortality

Jinwu Wang, Zhe Liu, Mao Yang, Wenqi Zhou, Han Tang, Long Qi, Qi Wang () and Yi-Jia Wang ()
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Jinwu Wang: College of Engineer, Northeast Agricultural University, Harbin 150030, China
Zhe Liu: College of Engineer, Northeast Agricultural University, Harbin 150030, China
Mao Yang: College of Engineer, Northeast Agricultural University, Harbin 150030, China
Wenqi Zhou: College of Engineer, Northeast Agricultural University, Harbin 150030, China
Han Tang: College of Engineer, Northeast Agricultural University, Harbin 150030, China
Long Qi: College of Engineer, South China Agricultural University, Guangzhou 510642, China
Qi Wang: College of Engineer, Northeast Agricultural University, Harbin 150030, China
Yi-Jia Wang: School of Water Conservancy & Civil Engineering, Northeast Agricultural University, Harbin 150030, China

Agriculture, 2024, vol. 14, issue 3, 1-23

Abstract: Weeds compete with rice for sunlight and nutrients and are prone to harboring pathogens, leading to reduced rice yields. Addressing the issues of low weeding efficiency and weed mortality rates in existing inter-row weeding devices, the study proposes the design of a combination paddy field inter-row weeding wheel. The device’s operation process is theoretically analyzed based on the weed control requirements in the northeastern region of China, leading to the determination of specific structural parameters. This research conducted experiments on the mechanical properties of weed cutting to obtain geometric parameters for paddy field weeds. It was found that the range for the cutting gap of the dynamic–fixed blade is between 0.6 mm to 1.4 mm and the cutting angle is between 5° to 15°, resulting in the lowest peak cutting force for weeds. Using LS-DYNA R12.0.0 dynamic simulation software, a fluid–structure interaction (FSI) model of the weeding wheel–water–soil system was established. By employing the central composite experimental design principle and considering the soil stir rate and coupling stress as indicators, the optimal structural parameter combination for the device is obtained: a dynamic–fixed blade cutting gap of 1.4 mm, a cutting angle of 10.95°, and a dynamic blade install angle of −3.44°. Field experiments demonstrated that the device achieved an average weeding rate of 89.7% and an average seedling damage rate of 1.9%, indicating excellent performance. This study contributes to improving weed mortality rates and provides valuable guidance for inter-row mechanical weeding technology.

Keywords: paddy field; mechanical weeding; combination of dynamic–fixed blade; weed cutting mechanical properties; finite element method (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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