关键词: 栽植机构, 数学模型, MATLAB, 多目标优化

Abstract: In order to make the transplanting machine have better planting performance, a cam swing rod planting mechanism is proposed, to ensure good planting erectness, uniformity and planting depth pass rate, it is necessary to analyze the length and position of the connecting rod part of the planting mechanism, establish the corresponding mathematical model on the basis of the working principle of the planting mechanism, and obtain the corresponding design variables, constraint functions and the target trajectory function of the planting point through analysis. Using fgoalattain in MATLAB optimization toolbox to solve the complex multiobjective nonlinear programming problem of transplanting machine planting mechanism, a set of optimized data with a relatively complete set of design variable parameter combinations［L1、L2、L3、L4、L5、L6、θ2、θ3、γ］ can be obtained, and the optimal parameter combination is ［128 mm；52 mm；150 mm；120 mm；336 mm；60 mm；256π/180；316π/180；8π/180］, and then can obtain the trajectory curve, pendulum curve, velocity curve and acceleration curve of the planting point, with the plant distance variation coefficient, uprightness and planting depth pass rate as evaluation index, record the corresponding transplanting data, when the speed is 300, 400 and 500 mm/s, the pass rate and excellent rate of transplanting have reached more than 90% and 80% respectively, which can better meet the requirements of transplanting operations than before optimization.

Key words: planting mechanism, mathematical model, MATLAB, multiobjective optimization