Abstract
An underwater glider is an autonomous underwater vehicle that is propelled by changes in volume. Due to this propulsion method, it is possible to make observations with these devices continuously for 30–60 days. Of the gliders’ physical properties, the volume change has the greatest influence on the cruising speed. The speed can be increased by increasing the volume change, but this also increases the energy consumption. Therefore, the change in buoyancy is very important for the operation of underwater gliders. Hence, it is necessary to optimize the change in buoyancy. In this study, we describe a technique for optimizing the design of underwater gliders intended to operate in the East Sea of Korea using a combined buoyancy engine and thruster propulsion system. First, we carried out a simulation study to optimize the volume change of the buoyancy engine based on the average flow velocity distribution, water temperature, and vertical salinity distribution in the East Sea. Then, we used our simulations to predict the optimal change in volume of the underwater glider. Finally, we discuss the advantages of operating with thrusters in special environments under specific water temperature, salinity distribution, and ocean current conditions.
Highlights
Oceanographic observations began with shipping, before the common era (BC)
When the combined propulsion provided by the thrusters and the buoyancy engine is used, the optimal pitch angle converged to 6 36°
We have described an optimal design for an underwater glider intended for use in the East Sea
Summary
Oceanographic observations began with shipping, before the common era (BC). The progress of civilization led to further development of shipping for the purpose of trading and exploration for resources. The average speed of the Western Sea and the Southern Sea is fast, and the water depth is 100 m, which is shallow compared to the East Sea, making it difficult to operate the glider because it interferes with obstacles such as fishing nets.[9,10] the mean velocity of the ocean currents around the East Sea is less than 0.7 kN, but natural phenomena cause the flow rate to change constantly around this region.[11,12] Geographically, Korea is located to the south of North Korea and to the east of Japan For this reason, the optimal sea area for operat-.
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