The experts on granular material distinguish the physical properties of their samples by tactile sensation. Generally, tactile sensation is derived from weak vibration that is caused by the friction between a finger and a object. However, the interaction between granular particles is so complex that the mechanism of the friction of granular material is not so clear [1]. In this study, a new friction tester has been made, which is aimed to estimate the influence of the vibration on tactile sensation of granular material.
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