Abstract
Reducing operation energy consumption is the development demand of conservation tillage equipment. In order to solve the problems of high power consumption and the easy blockage of the no-tillage drill under full straw retention, the key parameters of the straw back-throwing device were optimized in this study. The Box–Behnken central combination test method was used to analyze the influence of the impeller rotating speed, feed quantity and cross-sectional area of the throwing pipe on the specific power consumption and throwing speed, the mathematical models of which were built with the aid of the least square method. In addition, the mathematical models were optimized by using a multi-objective quantum behaved particle swarm optimization (QPSO) with an improved target weighting coefficient. The optimization results indicated that, when the impeller rotating speed was 2287 r/min, the feed quantity was 1.1 kg/s and the cross-sectional area of the throwing pipe was 506.997 cm2, the specific power consumption and throwing speed by the models were 7528 m2/s2 and 11.73 m/s, respectively. The models were verified by comparing the optimization results with the measured data in the simulation filed tests, which proved that the multi-objective QPSO algorithm was feasible to optimize the working and structural parameters of the straw back-throwing device of the no-tillage drill under full straw retention. The results provide references for the parameter optimization of similar no-tillage drills under straw retention.
Highlights
The sowing method of the no-tillage drill has the advantages of racing against time, high replanting index, protecting the soil ecological environment, low cost and so on [1].it is adopted all over the world, especially in North America, Oceania, Europe and Asia, and is used in many crops, including corn, wheat, soybean and so on [2]
The no-tillage drill under full straw retention can help to achieve the processes of straw chopping, straw transport, sowing, fertilization and straw mulching once and for all, which are widely used in many areas of China [4]
It could be proved that the improved multi-objective quantum particle swarm optimization (IMQPSO) algorithm was effective, indicating that the improved optimization algorithm was feasible to optimize the back-throwing device
Summary
The sowing method of the no-tillage drill has the advantages of racing against time, high replanting index, protecting the soil ecological environment, low cost and so on [1]. It is adopted all over the world, especially in North America, Oceania, Europe and Asia, and is used in many crops, including corn, wheat, soybean and so on [2]. As an important working part of the no-tillage drill under full straw retention, the back-throwing device is of great significance to performance improvement [5]. Many scholars have studied the back-throwing device of the no-tillage drill under full straw retention [6,7,8]
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