Authors

Abstract

To solve the problems of high error on both sides and high coefficient of variation during liquid manure distribution, this work designed a distribution mechanism integrating conveying, stirring and distribution functions, combined with the physical properties of selected liquid manure. Taking rotor speed, inlet flow and moving cutter structure as test factors, the Design-Expert 8.0.6 software was used to design "three-factor three-level quadratic regression" orthogonal test and establish response surface regression model. Through observing relative error and coefficient of variation, uniform distribution characteristics test and parameter optimization of liquid manure were performed. The results showed that the primary and secondary order of influencing factors on the relative error is rotor speed> inlet flow > moving cutter structure; the primary and secondary order of influencing factors on the coefficient of variation is inlet flow > moving cutter structure> rotor speed. Further, the optimization test indicated that 170 r/min rotor speed, 80 m3/h inlet flow, combined with arc-shaped moving cutter structure could output 10.50% relative error and 9.30% variation rate, which was less than 5% relative to the model predicted value.

Abstract in English

针对液态粪肥在分配过程中存在两侧分配误差高、变异系数高等问题，结合选取液态粪肥的物理特性，设计了一种兼具输送、搅拌、分配组合式液态粪肥分配机构,并进行了液态粪肥均匀分配特性试验与参数优化。以转子转速、入口流量和动刀结构为试验因素,以两侧相对误差和变异系数为试验指标，运用Design-Expert 8.0.6 软件设计三因素三水平二次回归正交试验,建立了响应面回归模型，并进行优化与试验验证。结果表明：各因素对相对误差影响的主次顺序为: 转子转速、 入口流量、动刀结构；各因素对变异系数影响的主次顺序为: 入口流量、动刀结构、转子转速。对优化结果进行了试验验证，当转子转速为170 r/ min、入口流量转速为80 m3/ h、 动刀结构为弧形，此时，相对误差为10.50%,变异系数为9.30%。验证试验结果与模型预测值相对误差小于5%。