Design and DEM Analysis of Bionic Drag-reducing Slant Column Subsoilers

Excessive subsoiling resistance is one of important reasons that restrict effect of subsoiling operation and popularization of subsoiling machines．The subsoiling resistance is mainly caused by subsoiler, thus it will contribute to promotion of subsoiling, energy conservation and consumption reduction with improving subsoiler structures meanwhile reducing working resistance．Digging bamboo rat （Rhizomyidae） and antlion （Myrmeleon sagax） larvae were used as bionic objects．Structure of bamboo rat paw and antlion larvae was obtained by three-dimensional scanner Konica Minolta Vivid 910, hereby three-dimensional surface of bamboo rat paw and antlion larvae back was established．Excellent excavation curves were extracted by reverse engineering, solid models of slant column subsoilers were established．For targets of subsoiling depth, width and penetrating angle, a series of bionic slant column subsoilers was designed．In the meanwhile, a kind of design method was put forword for shovel shaft of slant column subsoilers．Simulation of subsoiling resistance by EDEM software showed that bionic design of subsoilers’ shovel shaft and shovel pointed could effectively reduce subsoiling resistance, and the maximum reduction rate was 12.92%．Design of bionic slant column subsoiler would provide a new design idea for its structural optimization．