肋条型仿生镇压辊减粘降阻试验

Reduction of Soil Adhesion and Traction Resistance of Ridged Bionic Press Rollers

基于臭蜣螂腹侧面的几何结构,设计了9种肋条型仿生镇压辊。肋条结构采用具有良好疏水性的超高分子量聚乙烯材料。采用L9（34）正交表,考察了土壤干基含水率为20%时,肋条结构底面宽度W、高宽比R、镇压辊载荷F和面积比K对镇压辊粘附土壤量和牵引阻力的影响。结果表明：在试验条件下,与普通镇压辊相比,仿生镇压辊在保证适宜玉米生长容积密度前提下具有明显的减粘效果,减粘率最高可达41.08%;合理的肋条结构尺寸可使仿生镇压辊的减阻率达11.75%-39.40%。采用极差法对试验结果进行分析,得到了影响镇压辊粘附土壤量和牵引阻力因素的主次顺序及最优水平,并探讨了各因素对镇压辊粘附土壤量和牵引阻力的影响。

The phenomenon of soil adhesion occurred widely when conventional press roller worked.To solve the problem,nine biomimetic press rollers with bionically ridged structures were designed learning from the geometric structure of the ventral surface of dung beetle（Copris ochus Motschulsky）.Bionically ridged structures using ultra high molecular weight polyethylene material, which possessed good hydrophobic properties,were modeled on the surfaces of press rollers.Orthogonal tests of L9（34） were performed in an indoor soil bin with a moisture content（dry basis） of 20%.The effects of the bottom width of ridge section（W）,ridge height to width ratio（R）,roller loads（F） and the area ratio（K） on soil adhesion and traction resistance were determined.The results showed that under the identical conditions,all bionic rollers exhibited lower adhesion than a conventional roller against soil in a suitable compaction for corn,and the maximal adhesion reduction rate was 41.08%.The bionic roller with ridged structure with reasonable dimensions could reduce the traction force by 11.75% ~ 39.40% than conventional roller.The order and optimal levels of the experiment factors influencing soil adhesion and resistance were determined by range method.The impact of the different factors on the soil adhesion and resistance of press roller was discussed.