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      저자 : Tan-Hanh Pham(팜탄한) (검색결과 2 건)
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      • Design and test of a tail-beating propulsion system for the robotic flying fish

        Tan Hanh Pham(팜탄한),Hoang Vu Phan(판호앙부),Hoon Cheol Park(박훈철) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4

        Flying fish are unique underwater animals that can escape from water to air producing large thrusts by undulating their caudal fins and creating relatively fast swimming speed of 10 m/s. The average mass of flying fish is about 30 gram and their lengths are 15 cm to 50 cm. As the first step of developing a robotic system that can mimic the outstanding feature of flying fish, we first designed and tested an electromagnetic motor-based propulsion system that can create a fast tail-beating motion and produce a thrust. The required torque of the motor was calculated considering the gear ratio and the applied torque from tail based on the added mass model. Experimental results obtained from measurement showed that propulsion system could generate a cycle average thrust of 0.88 N at a tail beating frequency of about 11 Hz when 12 V is applied to the motor. The propulsion system will be further improved for a larger thrust generation and robotic fish will be designed and fabricated, which hosts the propulsion system.

      • Preliminary study for developing a flying-fish-mimicking swimming robot

        Tan-Hanh Pham(팜탄한),Hoon Cheol Park(박훈철) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11

        Flying fish is the only fish that can leap from the water and glide in the air. We have been performing a basic study for developing a swimming robot to mimic the underwater leap of the flying fish. In this paper, we present our research progress in the propulsion system design, thrust measurement, drag coefficient measurement, and underwater-leap speed estimation. The measured average thrust produced by the tail-beating thruster was about 0.88 N at about 11 Hz. The drag coefficient was measured and predicted to be 0.02. From a vertical underwater-leap test using the buoyancy force, we have confirmed that it is possible to jump from the water into the air when a swimming robot can reach the water surface at about 2.5 m/s.

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