Cave animals are often adapted to digging and life underground, with claw toes similar in structure and function to a sampling\nscoop. In this paper, the clawed toes of the Himalayan marmot were selected as a biological prototype for bionic research. Based\non geometric parameter optimization of the clawed toes, a bionic sampling scoop for use on Mars was designed. Using a 3D laser\nscanner, the point cloud data of the second front claw toe was acquired. Parametric equations and contour curves for the claw were\nthen built with cubic polynomial fitting.We obtained 18 characteristic curve equations for the internal and external contours of the\nclaw. A bionic sampling scoop was designed according to the structural parameters of Curiosityââ?¬â?¢s sampling shovel and the contours\nof the Himalayan marmotââ?¬â?¢s claw. Verifying test results showed that when the penetration angle was 45âË?Ë? and the sampling speed\nwas 0.33 r/min, the bionic sampling scoopsââ?¬â?¢ resistance torque was 49.6% less than that of the prototype sampling scoop.When the\npenetration angle was 60âË?Ë? and the sampling speed was 0.22 r/min, the resistance torque of the bionic sampling scoop was 28.8%\nlower than that of the prototype sampling scoop.
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