| Micro-rotary cultivator is a kind of farming machinery which is widely used in the mountainous areas. So far, the interaction process between rotary working parts and the soil is not clear when the tiller works in the paddy field. Besides the impact of the structure parameters on working quality is still obscure which makes it difficult to optimize the working parameters and working quality. Therefore, it is significant to research the interaction between working parts and soil as well as the effect of parameters on working quality with advanced technology and methods. It is helpful to optimize the parameters of working parts and improve the machinery’s working quality in paddy fields.The paper, based on the 1WGQ4 micro-rotary cultivator, uses the coupling algorithm of FEM-SPH and the quadratic General Rotary unitized design to build the dynamics simulation model analyzing the mechanism of rotary working parts and soil. With two test conditions, blades arrangement on the rotation shaft and soil, building the mathematical model which contains the relationship among blade rotation speed, blade turning radius and working quality is useful to analyze the influencing factors and optimize the parameters by MATLAB. The results show that the dynamics simulation model has a high accuracy and the working quality of the machinery is influenced by the arrangement, rotary speed and rotary radius deeply. The throwing soil property and the power consumption are quite acceptable with the rotary speed of 25.7radls and the radius of 15.5cm. As the machinery has a forward speed of 0.7m/s, the optimum combination is a rotary speed of 25.7rad/s and a radius of 15.5cm. And the optimization results are the power consumption of 185W, missing plowing rate of 9.88%, throwing soil volume of 15.62 and throwing speed of 2.67m/s in soil condition 1 while the power consumption of 402.5W, missing plowing rate of 9.43%, throwing soil volume of 19.2 and throwing speed of 3.5m/s in soil condition 2. |
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