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针对现有高速分插机构参数优化方法盲目性较大或计算复杂的问题,以椭圆齿轮三插臂分插机构为例,采用虚拟中心组合响应面试验设计方法,以插秧株距140mm时的插秧穴口宽度、推秧角度和轨迹高度3个指标为目标函数,以椭圆齿轮偏心率、齿数、行星架初始安装角度和插植臂安装角度4个参数为设计变量,构建响应面回归模型,采用优化算法求解响应面近似回归模型,直接求得一组满足多个约束条件的最佳参数组合。以求解的最佳参数组合:椭圆齿轮偏心率0.18、齿数23齿、行星架安装角度15°、插植臂安装角度25°设计并试制三插臂分插机构。通过理论分析和台架试验,回归模型计算的目标函数值与理论计算值和台架试验实测值之间的最大相对误差为0.668%。分析结果表明:采用虚拟响应面法优化可直接求得满足多个约束条件的参数组合,计算精度较高,提高了高速分插机构参数选择的针对性。
In order to solve the problem of large blindness or complicated calculation of the existing optimization methods of high-speed add / drop mechanism, taking the elliptical gear three-plugging-in mechanism as an example, the virtual center combination response surface test design method was used. When the seedling transplanting distance was 140mm, Width, the angle of projectile and trajectory height as the objective function. The parameters of eccentricity of oval gear, the number of teeth, the initial installation angle of the planet carrier and the installation angle of the planting arm were taken as the design variables to construct the response surface regression model. The optimization algorithm Solve the response surface approximate regression model, directly to obtain a set of the best combination of parameters to meet multiple constraints. To solve the best combination of parameters: 0.18 oval gear eccentricity, the number of teeth 23 teeth, the planet carrier installation angle of 15 °, planting arm installation angle of 25 ° design and trial manufacture three plug-in sub-mechanism. Through theoretical analysis and bench test, the maximum relative error between the objective function value calculated by the regression model and the theoretical calculation value and the bench test value is 0.668%. The analysis results show that the optimization of the virtual response surface method can directly obtain the parameter combination satisfying multiple constraints, and the calculation precision is high, which improves the pertinence of the parameters selection of the high-speed interpolation mechanism.