The model describing the forces acting on rice seeds within seed metering systems significantly impacts the design and structural parameters of rice pneumatic seed metering mechanisms.To formulate a mathematical repre...The model describing the forces acting on rice seeds within seed metering systems significantly impacts the design and structural parameters of rice pneumatic seed metering mechanisms.To formulate a mathematical representation of the device during seed suction,a DEM-CFD bidirectional coupling approach was utilized to simulate and model the seed-suction process.The dynamic behavior of rice seeds under the airflow at the suction port was examined,and force models for various seed-suction positions were developed.Simulation analyses were conducted under varying conditions,including different rotation speeds of the seed-suction plate and different levels of negative suction pressure.The effects of these variables on seed suction were investigated,leading to the development of a drag force model.Optimal seeding parameters and precision were determined from the simulation results.Verification and analysis were conducted through empirical experiments,and the optimal seeding performance was attained at a negative suction pressure of 1.6 kPa and a plate rotation speed of 30 r/min.The results indicated a seeding qualification rate of 95.7%,a reattachment rate of 2.4%,and a leakage suction rate of 1.9%.The simulation findings were consistent with experimental data,demonstrating that the seed-metering device satisfies the requirements for field seeding.展开更多
基金funding from the National Natural Science Foundation of China(Grant No.32201669)the Guangzhou Science and Technology Plan Project(Grant No.2023A04J0865)+5 种基金Key Discipline Research Capability Enhancement Project in Guangdong Province(Grant No.2024ZDJS081)Guangdong Provincial Junior Innovative Talents Project for Ordinary Universities(Grant No.2022KQNCX122)the project was supported by Open Fund of State Key Laboratory of Agricultural Equipment Technology,South China Agricultural University(Grant No.SKLAET-202405)Guangzhou College of Commerce Campus Project(Grant No.2021XJYB06)Guangdong Provincial Key Laboratory of Agricultural Artificial Intelligence Open Plan Project(Grant No.GDKL-AAI-2022002GDKL-AAI-2022003).
文摘The model describing the forces acting on rice seeds within seed metering systems significantly impacts the design and structural parameters of rice pneumatic seed metering mechanisms.To formulate a mathematical representation of the device during seed suction,a DEM-CFD bidirectional coupling approach was utilized to simulate and model the seed-suction process.The dynamic behavior of rice seeds under the airflow at the suction port was examined,and force models for various seed-suction positions were developed.Simulation analyses were conducted under varying conditions,including different rotation speeds of the seed-suction plate and different levels of negative suction pressure.The effects of these variables on seed suction were investigated,leading to the development of a drag force model.Optimal seeding parameters and precision were determined from the simulation results.Verification and analysis were conducted through empirical experiments,and the optimal seeding performance was attained at a negative suction pressure of 1.6 kPa and a plate rotation speed of 30 r/min.The results indicated a seeding qualification rate of 95.7%,a reattachment rate of 2.4%,and a leakage suction rate of 1.9%.The simulation findings were consistent with experimental data,demonstrating that the seed-metering device satisfies the requirements for field seeding.
