| In agricultural production operations in hilly areas,different crops have different inter-row distances,and the same crop has different row distances due to different planting methods.Most of the existing agricultural machinery equipment has a fixed wheelbase,traditional steering structure,and large turning radius,which results in poor adaptation to ridge-till agriculture.Therefore,the development of agricultural machinery equipment in hilly areas needs to accelerate the research and development of equipment that has certain terrain adaptability and adjustable wheelbase.This article designs a variable wheelbase mechanism and a four-wheel independent steering cross-ridge working electric mobile platform that is suitable for ridge-tillage agriculture in hilly mountainous areas;it also completes the mechanical structure design,structural simulation analysis,and control system construction.The main contents of this paper include:(1)The main contents of this paper include:Based on a comprehensive analysis of the research status of domestic and foreign agricultural electric platforms and the agronomic requirements of crops in hilly areas,the mechanical structure design requirements and performance indicators of the cross-ridge electric mobile platform were proposed.A variable wheel mechanism suitable for the electric platform was developed based on the row spacing requirements of agronomy,and the walking and steering mechanisms were developed based on the terrain and gap requirements of crops in hilly areas.(2)The mechanical structure design of the cross-ridge electric mobile platform was analyzed in terms of motion and force.The degrees of freedom,kinematics,and force analysis of each mechanism were calculated,and the turning shaft,key,and flange bolts were checked.The 3D modeling and assembly of different motion mechanisms were completed using Solid Works 2021 to obtain a virtual prototype of the cross-ridge electric mobile platform.(3)ADAMS View simulation analysis was carried out,including longitudinal climbing dynamics simulation and climbing turning dynamics simulation.The simulation results verified the reliability of the motion and force analysis of the electric mobile platform,and the strength and stiffness of each component of the walking mechanism were checked based on the force conditions.(4)Static finite element analysis was carried out using ANSYS Workbench software for the non-standard parts and frame of the walking mechanism,and the displacement and stress cloud maps were obtained.The strength and stiffness were checked according to the fourth strength theory and simulation results.Modal analysis of the frame was conducted to confirm that it would not be affected by the interference of the motor and the road surface during operation.(5)The construction of the control system was introduced,including the control of the wheel hub motor,etc. |
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