DESIGN OPTIMIZATION AND DRAG REDUCTION OF BIONIC SUBSOILER THROUGH FEM SIMULATIONS

摘要

The subsoiler machine is one of important agriculture farming machines. In the subsoiling operation, the tillage resistance of the subsoiler is large and the energy consumption is high. It has a higher requirement for power output of tractor. Tillage often fails to meet agronomic requirements. In this paper, the subsoiler is considered as the test object and the shark as the bionic object. The bionic triangular prism (BTP) and partial circular column (BPCC) structures were extracted from the placoid scale rib structure of the shark skin. They were applied to the subsoiler to reduce the resistance between the soil and the subsoiler. The finite element analysis software was used to simulate and analyze the interaction process of four bionic structure subsoiler models and the soil model. It showed that S-T-H (shaft with BTP in horizontal direction of motion), and T-T (tine-triangle prism model) had more obvious drag reduction effects than other types of subsoiler. The drag reduction rate of S-T-H was maximum up to 25.45% and that of T-T was up to 20.42%. The spacing between the bionic coupling elements also affected the drag reduction effect. S-T-T and T-T bionic models with spacing of 6 mm were superior to others.