Abstract
The final goal of this study is to develop a buoyancy control device for underwater robot utilizing phase change of material. A conventional underwater robot and a conventional submarine adjust buoyancy by discarding a set of iron balls or seawater in other place, which is harmful to the environment. Therefore, we proposed new buoyancy control method utilizing phase change of material. In the previous papers, we used paraffin wax. However, its melting point is high (approximately 47℃). Therefore, we must look for a new material that has lower melting point, and not harmful to the environment. We manufactured a new buoyancy mechanism to test materials. Finally, we focused on lard and find out that lard has lower melting point (approximately 25℃) with high density difference between liquid and solid phases and thus response faster than paraffin wax.
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