凹坑形仿生刀齿土壤切削力分析

Analysis on the Soil Cutting Force of Concave Bionic Blade

土壤对疏浚机具的粘附会增加切削阻力、降低切削效率。土壤动物的非光滑表面为疏浚机具的仿生设计提供了参考。非光滑表面切削土壤具有减阻的作用,针对凹坑形非光滑表面的刀齿切削土壤的的受力情况进行理论分析,建立了其土壤切削模型。利用软件Fluent进行了凹坑形光滑表面刀齿在土壤切削过程中的力学分析,结果表明:在一定的土壤条件下,与光滑表面刀齿相比,非光滑凹坑形刀齿粘附对土壤粘附力较小,受到的切削阻力也较小。理论分析和与数值模拟均验证了非光滑凹坑形仿生刀齿能够起到预期的减粘减阻的效果。

Soil on the dredging machine will increase the cutting resistance and reduce the cutting efficiency. The non-smooth surface of soil animals provides a reference for the bionic design of dredging machines. The non-smooth surface cutting soil has the effect of reducing resistance. The soil cutting model is established according to the stress conditions of the cutter tooth in cutting soil. The mechanics analysis on concave smooth surface cutter in soil cutting process is conducted by using the FLU-ENT software. The results show that under certain soil conditions, compared with the smooth surface cutter, the adhesion force of the non-smooth concave cutter teeth to soil is less, and the cutting resistance is less. The theoretical analysis and numerical simulation show that the non-smooth concave bionic blade can be expected to reduce the drag reduction.