20606 生物移動のトライボロジー : 体表面/床表面の摩擦(OS9 バイオエンジニアリング)

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The frictional characteristics of a couple of creatures have been determined using a 3D micro force plate developed in our laboratory. Using the force plate, it was possible to measure the frictional force and vertical force applied to the force plate. Earthworms, named "Eisenia fetida" and "Pheretima hupeiensis" in Japanese, were used to determine their frictional behaviors when they moved on waterproof sand papers fixed to the force plate. The coefficient of static friction of Eisenia fetida against the sand papers were 6.9, 5.7, and 3.9, at the roughness of 3.0, 3.7, and 16.2μm, respectively, with a significant difference (p<0.05) observed between the roughness of 3.0 and 16.2μm. The coefficient of friction of Pheretima hupeiensis against the sand papers indicated a smilar trend as to that of Eisenia fetida. Mucous liquid secreted from earthworms was observed on the surface of the roughness of 3.0 and 3.7μm after the friction test. Microscopic observation indicated that earthworms had many spikes called "seta" around their bodies and that they controlled the length of the seta while moving on an irregular surface. For comparison, similar measurements have been also performed for a stag beetle named "Prosopocoilus inclmatus" and a turtle named "Trachemys scripta elegans". Note that these creatures move by gait using the legs and nails. The coefficient of static friction of the creatures increased with the increase of the roughness of floor surface. These results indicate that earthworms are different from stag beetles and turtles in terms of tribology in locomotion, and that the earthworms control their frictional behavior in response to various surfaces by the use of their mucous liquid and seta.
一般社団法人日本機械学会の論文
2005-03-17

20606 生物移動のトライボロジー : 体表面/床表面の摩擦(OS9 バイオエンジニアリング)

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