Structural Optimization Design and Test of Groove Wheel Apparatus for Solid Particle Spreading UAV
Aiming to solve problem of unstable fertilizing performance caused by high pulsation of groove wheel type fer-tilizer apparatus at low speed,to meet with stabilize and variable rate fertilizer discharging requirements of unmanned aer-ial vehicle(UAV).The optimization design and research of key component parameters of fertilizer apparatus were carried out,and nine kinds of groove shapes and spiral angle of fertilizing groove wheel were designed and compared.Discrete el-ement method(DEM)was used to simulate fertilizing range and stability of fertilizer discharge for each groove wheels.Interactive test and orthogonal test were conducted,and interaction between the section shape and helix angle of the groove wheel was clarified.Results of the orthogonal test showed that the rotation speed and the helix angle of the groove wheel significantly influence to the fertilizing stability.Finally,optimized combination of the structural parameters for the groove section shape and helix angle were determined as eccentric type and 60 degrees,respectively.To verify correct-ness of simulation and the stability of fertilizing performance,bench test was designed and conducted.The results showed that the groove wheel rotation speed and fertilizing rate had a high linearity,compared with the average fertilizing rate measured by bench test and simulation test,and the average relative deviation was 5.32%.Also,the section shape of the groove wheel and the helix angle of the groove showed significant effects on the fertilizing rate variation coefficient,and the fertilizing rate variation coefficient at different rotation speeds was all less than 1.20%for groove wheels under the optimized parameters,satisfied with requirements of UAV-based fertilization.
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