ASABE Technical Library - Abstract

Abstract. In this paper 15% of the moisture content of the cultivated soil worked as the research object. Based on the dry particles contact model, by adding bond constraints characterized the particle bonding role due to the presence of water. By setting the critical normal stress, critical shear stress and particle bonding radius to express the bond constraint parameter of the soil particles. Established the discrete element contact model of the wet granular soil and discrete element analysis model of the rotary tiller parts based on the bond constraint parameters. Simulation results show that increasing the rotary blade speed can improve the pulverize quality , but increasing the machine forward speed the pulverize quality declined. Finally, the machine forward speed of 0.3m/s, the rotary blade speed 180rpm were the experimental conditions for pulverize performance test. Actual test broken soil rate was an average of 86%. The simulation results of the same conditions is 81.26%. Simulation, test results show that the correctness of cultivated soil particle contact model and the feasibility of the discrete element simulation on the pulverize performance .