Finite Element Analysis And Structure Optimization For Subsoiling Shovel Based On Soil Mechanics Model

Tillage is a very important part in the agricultural production, and it has a most energyconsumption in agriculture. The energy consumption during tillage to overcome tractionresistance accounted for40%-60%of that consumed by field operation. Optimizing tillagemethods, improving tool structure, and reducing traction resistance will effectively reducethe power consumption of the agricultural machinery, and will play a positive role inpromoting mechanization of agricultural production in China.Subsoiling shovel is the core component of subsoiler. Its structure has importantinfluence on working resistance. This thesis carried out following research work forsubsoiling shovel structure:1. A reasonable subsoiling shovel model is proposed theoretically by analyzing forces inthe shovel and spade handle part based on the three wedge mechanics theory. Using Pro/Esoftware established solid models of the bionic subsoiling shovel and JB subsoiling shovel,Sichuan soil is employed as an example for building the Drucker-prager elastoplasticconstitutive soil model.2. Optimization for the curve of the subsoiling shovel is performed from bionic study ofmice claw toes and dung beetles,. Curve parameters of subsoiling shovel’s cross section areimproved by blind-walking optimization method. A optimal cross section is obtained bycalculating Sichuan soil model at a farming speed of4.8km/h.3.Traction resistance and soil stress in all directions are obtained by finite elementanalysisfor interaction between soil and subsoiler using ABAQUS code.. Studies have shownthat the resultant traction resistance force of bionic subsoiling shovel is decreased by20.36%than that of the traditional subsoiling shovel, and side force decreased by90%.Farming speed has few affect onwork power.4. Cultivation conditions have large influence on traction resistance. To adapt differentcultivation conditions in a certain extent, a new subsoiling shovel structure that can adjustwork angle and depth is designed on the basis of analysis of traction resistance and cats clawtoe telescopic structure.