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HANNOVER MESSE 2020, 20 - 24 April

BionicFinWave

Underwater robot with unique fin drive

Logo BionicFinWave

Product description

Nature teaches us impressively, how optimal drive systems for certain swimming movements should look like. To move forward, the marine planarian and sepia create a continuous wave with their fins, which advances along their entire length. For the BionicFinWave, the bionics team was inspired by this undulating fin movement. The undulation pushes the water backwards, creating a forward thrust. This principle allows the BionicFinWave to maneuver forwards or backwards through an acrylic tube system.

Its two side fins are completely cast out of silicone and do not require struts or other supporting elements. The two fins are attached to the left and right of nine small lever arms, which in turn are powered by two servo motors. Two adjacent crankshafts transmit the force to the levers so that the two fins can be moved individually to generate different shaft patterns. They are particularly suitable for slow and precise locomotion and whirl up less water than, for example, a screw drive. A cardan joint is located between each lever segment to ensure that the crankshafts are flexible. For this purpose, the crankshafts including the joints and the connecting rod are made of plastic in one piece using the 3D printing process.

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