基于DEM-MBD耦合的滚勺式精量穴播器成穴器运动参数优化OACSTPCD

Aiming at the problems that the trajectory of fixed cavity formers of rolling spoon-type precision cavity seeders is in the form of a residual pendulum line,and the residual pendulum line is too large,which causes tearing and picking of the film,and in order to reduce the variability of the spacing of the plants,the simulation and analysis of the motion process of the cavity seeders are conducted based on discrete element method and multi-body dynamics coupling method.Taking the traction speed,traction angle and cavity seeder quality as the influencing factors,and the residual pendulum width,plant spacing and sowing depth as the response values,the influence law of each factor on the response values is determined through pre-test and single-factor test.Based on the results of the pre-simulation test,a multi-factor simulation test is carried out to obtain the optimal parameter combinations and to verify the reliability of the optimal results through the field test.The results show that:The optimal parameter combination of rolling spoon-type precision cavity formers is traction speed 523.43 mm/s,traction angle 21.9° and cavity seeder mass 18.2 kg.Under above condition,the plant spacing is 196.84 mm,and the width of the residual pendulum line is 13.98 mm.The optimal parameter combinations for the validation test are the plant spacing 193.86 mm with relative error 1.51％,the residual pendulum line 13.28 mm with relative error 4.39％.