关键词: 蚯蚓 非光滑 法向粘附力 土壤粘附 仿生耦合

Abstract:

The earthworm （Eisenia foetida） was taken as research object. A tiny adhesion testing system was used to discover the changing regulation between soil moisture content and normal adhesion force of earthworm＇s non-smooth surface by single factor test. Through orthogonal multinomial experiment, the iinfluence of positive pressure and unloading speed to normal adhesion force of earthworm＇s non-smooth surface was explored, and regress equation was esstablished. The test result showed that the normal adhesion force was increased with a parabola tendency along with the increase of soil moisture content. Comparing with steel specimen, the maximal rate of reducing adhesion was 44%. The positive pressure assumed two effective relations to normal adhesion force. The unloading speed assumed one effect to normal adhesion force. The adhesion force will increase along with the increase of positive pressure and unloading speed. This study can provide basic data for bionic research on biologic non-smooth surface and revealing bio-mimetic coupling mechanism.

Key words: earthworm , non-smooth , normal adhesion force , soil adhesion , bio-mimetic coupling