搜索结果: 1-2 共查到“海洋科学 Mineral Resources”相关记录2条 . 查询时间(0.062 秒)
Developing the Mineral Resources of the Seabed
Mineral Resources Seabed economic well-being
font style='font-size:12px;'>
2008/12/17
The world’s oceans have played a vital role in the development of
virtually every nation. They provide the transportation network that
binds us together through trade; they yield much of the food th...
Valuable mineral resources are widely distributed throughout the seabed. autonomous underwater vehicles (AUVs) are preferable to remotely-operated vehicles (ROVs) when probing for such mineral resources as the extensive exploration area makes it difficult to maintain contact with operators. AUVs depend on batteries, so their power consumption should be reduced to extend exploration time. Power for conventional marine instrument systems is incorporated in their waterproof sealing. External intermittent control of this power source until termination of exploration is challenging due to limitations imposed by the underwater environment. Thus, the AUV must have a power control system that can improve performance and maximize use of battery capacity. The authors developed such a power control system with a three-step algorithm. It automatically detects underwater operational states and can limit power, effectively decreasing power consumption by about 15%.
surface piercing propeller boundary element method hydrodynamic characteristics
font style='font-size:12px;'>
2011/9/13
Demand for high-speed marine vehicles (HSMVs) is high among both commercial and naval users. It is the duty of the marine vessel’s designer to provide a hull and propulsion system that diminishes drag...