AbmacI-Itis always necessary to take the influence of reflected waves into consideration in a tank experiment. Under existing influence of reflected wave, it is difficult to make the target waves. However, if the boundary of basin can absorb reflected waves completely, it will be possible to make waves simulating the infinite ocean wave in a small basin.National Maritime Research Institute completed the deep-sea basin in April 2002. This basin consisted of hvo parts, the circular basin and the deep pit with 6m diameters. The circular basin was an upper part of the deep-sea basin and it was based on this idea. 128 sets of wave generators were arranged around the basin. Each generator moves to make P wave, and compensates B reflected wave simultaneously. It is possible to make various types of waves by combining a motion of wave generators. In order to investigate the wave making properties of circular basin, wave height distribution of regular wave, change of wave helght and phase angle, and power spectrum and distribution function of irregular wave were measured. Consequently, if B scale of model and a wave frequency were selected adequately, it was proved that this hasin could provide a long-sustained measurement.
In this paper, we introduce a newly developed AUV (Autonomous underwater vehicle) "TUNA-SAND"(Terrainbased Underwater Navigable AUV for Seafloor And Natural resources Development) and its exploration of the hydrothermal vent in Kagoshima Bay, Japan carried out on August 2007. TUNA-SAND is a hovering type AUV constructed in March 2007 as a platform for visual investigation of seafloor features.
This paper presents the overview of a R&D project "Zipangu of the Sea", focusing on the sub-R&D project supervised by National Maritime Research Institute of Japan. Consisting of 7 sub-projects, main object of the Zipangu of the Sea project is the development of core technologies required for exploring, investigating, monitoring, protecting, and developing benthic mineral resources. The project is a collaborative R&D conducted by national institutes, universities, and private companies in Japan. The NMRI of Japan leads a sub-R&D project of developing the system and strategy for simultaneous deployment and operation of multiple AUVs. In this sub-project, AUVs play a leading role as a cutting-edge undersea probe. Supervised by an USV, multiple AUVs form a fully-autonomous undersea survey unit. In this paper, we introduce a new benthic resource survey system consisting of multiple AUVs and an USV being developed by R&D association led by NMRI. Key technologies as well as hardware elements consisting of our system are also overviewed.
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