Abstract
In order to achieve the construction standard of high mechanized performance of the seedbed with whole plastic-film mulching on double ridges, in this study, the forms of suppression failure were analyzed, and the key factors influencing the suppression performance were determined based on the structure of the seedbed suppression device and its working principles. The discrete element method was adopted for numerical simulation on the suppression process of the seedbed with whole plastic film mulching on double ridges; the parameters during the interaction between the suppression device and seedbed soil were extracted and analyzed, such as contact area, sinkage and horizontal traction resistance trend of press wheels on big ridges and furrows of small ridge. Taking the suppression load on big ridges, suppression load on furrows of small ridge, and advancing velocity of the combined operation machine as the independent variables, qualified rate of suppression as the response value, a mathematical model between the test factors and qualified rate of suppression was established, to explore the influence sequence of the factors on suppression qualified rate. The optimal working parameters of the suppression device were finally obtained: the suppression load on big ridges was 40 N, suppression load on furrows of small ridge was 69.8 N and the machine advancing velocity was 0.98 m/s, and the achieved mean value of suppression qualified rate was 92.6%. Field verification test showed that the mean value of suppression qualified rate was 90.3%, a mere difference of 2.3% compared with the simulation result. The actual operation of the sample machine was basically consistent with the simulation process and could reveal the mechanized suppression operation mechanism of the seedbed with whole plastic film mulching on double ridges, indicating that the established DEM model and its parameter setting were relatively accurate and reasonable. Keywords: seedbed, whole plastic film mulching, double ridges, mechanized suppression, discrete element method, numerical simulation, parameter optimization DOI: 10.25165/j.ijabe.20211401.5866 Citation: Dai F, Song X F, Zhao W Y, Sun B G, Shi R J, Zhang Y. Numerical simulation and analysis of mechanized suppression process of seedbed with whole plastic film mulching on double ridges. Int J Agric & Biol Eng, 2021; 14(1): 142–150.
Highlights
Furrows sowing technology with whole plastic film mulching on double ridges is a breakthrough technology in dryland farming in northwest China
The mechanized suppression operation is of crucial importance: when suppression is too light, the seedbed's ability in resisting wind power from film uncovering would be weakened, resulting in film settlement and insufficient contact; if the suppression is too heavy, the mulched film may slip, resulting in dislocation of film at the center of the big ridges or failure of film-mulching on furrows
It is necessary to carry out numerical simulation and analysis on the mechanized suppression process of the seedbed with whole plastic film mulching on double ridges, optimize working parameters of the suppression device and improve its working performance
Summary
Vol 14 No. 143 importance in studying the interaction between soil and contact components, and simulation analysis of all kinds of operation process, such as subsoiling, soil covering, digging, rotary tillage has been done[9,10,11], there are few studies on the numerical simulation of the mechanized suppression process of the seedbed with whole plastic film mulching on double ridges, it is necessary to reveal the operation mechanism based on the research method For this reason, by establishing a 3D model on the interaction between the rigid suppression device (big ridge press wheels and press wheel on small ridge furrows) and seedbed soil, a discrete element method was applied to study the dynamic suppression process. Taking a load of the press wheel for the big ridge and load of the press wheels for small ridge furrows and the advancing velocity as test factors, suppression qualified rate of seedbed as test index, the study was aimed at revealing the mechanism of mechanized suppression of the seedbed with whole plastic film mulching on double ridges, to provide a theoretical basis for establishing a seedbed with whole plastic film mulching on double ridges
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