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Ship's Propulsion Using The Weis-Fogh Mechanism
Michihisa, Tsutahara,Takeyoshi, Kimura,Ro, Kideok 國立統營水産專門大學 附設 水産科學硏究所 1989 수산과학연구소보고 Vol.1 No.-
A two-dimensional model of the Weis-Fogh Mechanism, which is a mechanism of hovering flight of small insects, is applied to ship propulsion. A model of the propulsion mechanism consisting of one or two wings in a square channel is proposed. The thrust and the drag on the wing, which are defined, respectively, the force in the direction of progress of the ship and that of movement of the wing, are measured. The propulsive efficiency is calculated and is high when the moving speed of the wing is small compared with the advancing speed of the ship. A model ship equipped with this propulsion mechanism is made and working tests performed. The applicability of this propulsion mechanism to actual ships is expected to be good.
Cooperative Operation of Two Combine Robots for Rice Harvesting
( Michihisa Iida ),( Syota Harada ),( Ryosuke Sasaki ),( Masahiko Suguri ),( Ryohei Masuda ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
In order to solve shortage and aging of working force in Japanese agriculture, automation of agricultural machinery is promoted and is merged with information and communication technology (ICT) currently. Therefore, two robots, that are 4-row head-feeding combines, have been developed to automate rice harvesting work in Kyoto University. They are installed a multi-GNSS receiver, a GPS compass, and an IMU as navigation sensors. To increase the efficiency of farming operation, a cooperative harvesting system by combination of two robots was reported in ISMAB 2016. In that system, two robots could harvest rice side-by-side along target spiral path in the same field. As the next step, a block harvesting method by two robots is proposed in this study. After a human-driven combine harvested rice crop to make the turning space at the headland, two robots independently harvest two blocks of rice crops divided by “Nakawari”, that is the harvesting method to divide rice area into two. In this harvesting operation, the combine robot turns by 180-deg-turn (U-turn) at the headland. For the purpose, the 180-deg-turn control for combine robot was developed. In order to evaluate performance of cooperative harvesting operations by two combine robots, harvesting test was conducted in a rice paddy field. As a result, the efficiency of harvesting operation increases up to 24 % in comparison with the side-by-side harvesting method.
A Ship Propulsion Using a Mechanism of Hovering Flight of Small Insects
TSUTAHARA, Michihisa,KIMURA, Takeyoshi,RO, Kideok,TAKAHASHI, Kunio 國立統營水産專門大學 附設 水産科學硏究所 1990 수산과학연구소보고 Vol.2 No.-
A mechanism of hovering flight of small insects which is called the Weis-Fogh mechanism is applied to ship propulsion. A model of the propulsion mechanism is proposed, and a model ship equipped with this propulsion mechanism was made. The model ship demonstrates that this mechanism works as a ship propulsion. The dynamic properties of the model are studied experimentally, and the effects of the side walls and a control of the opening angle of the wing and also an interaction of two wings are clarified. Propulsive efficiency is as high as 80%, and the wing moving velocity is low comparing with the advancing speed of the ship. A conceptual design is carried out.