Topic Review
Classification of the Fish Inspired Robots
Compared with traditional underwater vehicles, bio-inspired fish robots have the advantages of high efficiency, high maneuverability, low noise, and minor fluid disturbance. The propulsion ability of fish comes from the coordination between muscle groups, which gives its body uniform weight distribution and a more space-saving motion structure. A body that has evolved over billions of years also has an excellent hydrodynamic shape and a reasonable structural elastic modulus. At the same time, the organic combination of movement between muscle groups is also the reason to improve the overall efficiency of movement. Finally, fish have unique fluid sensing systems. A body and (or) caudal fin (BCF) swimmer bends its body into a backward propulsive wave that extends up to its caudal fin, while median and paired fin (MPF) swimmers use the median and paired fins to gain thrust. Similar to the classification of the biological systems, fish-inspired robots can also be divided into BCF-based and MPF-based robotic fish with a series of subcategories.
  • 85
  • 10 Jun 2022
Topic Review
Key Technologies for Offshore Wind Power in China
Offshore Wind Power (OWP) has gained prominence in China’s national energy strategy. However, the levelized cost of electricity (LCoE) of wind power must be further reduced to match the average wholesale price. The cost-cutting and revenue-generating potential of offshore wind generation depends on technological innovation.
  • 73
  • 20 Jul 2022
Topic Review
Anchorage Area Detection
Mooring area detection represents one of the key technological problems that must be solved in the development of Maritime Autonomous Surface Ships (MASS). Anchoring operation is one of the key operations of ships, which is affected by various factors. The research on anchorage area detection focuses mainly on the safety distance between anchoring ships and methods of mooring area detection.
  • 70
  • 04 Jul 2022
Topic Review
Climate and Surfing
Surfing is one of the most popular activities in coastal tourism resorts. However, the sport depends strongly on the met-ocean weather conditions, particularly on the surface wind-generated waves that reach the coast.
  • 66
  • 26 Jul 2022
Topic Review
Vortex-Induced Motions of Floating Offshore Wind Turbine Structures
The ‘Green Shift’ from fossil energy (coal, oil and natural gas) to renewable energy (sunlight, wind, waves and tide) is now a global trend. DNV forecasts that by 2050, the installed floating global wind capacity will have grown from today’s 100 megawatts (MW) to over 264 gigawatts (GW), so that 2% of the world’s electricity demand can be supplied by cost-efficient and dependable floating offshore wind. Floating offshore wind is considered to be a viable solution at water depths exceeding 50 to 60 m with abundant wind resources. As a fast-evolving technology, it has the potential for less foundation material, shortened installation cycle and decommissioning, and additional wind power generation.
  • 64
  • 11 Aug 2022
Topic Review
Geometry-based Visual Navigation and Positioning Methods
With the development of visual simultaneous localization and mapping (vSLAM) technology as important technical support, the application of map-building systems has been greatly expanded. Autonomous unmanned underwater vehicles need to exhibit a high degree of autonomy in any complex environment that may exist to ensure robust navigation and positioning capabilities, and to build a map of the environment while implementing the navigation task. Geometry-based methods are classic solutions of vSLAM.
  • 31
  • 02 Sep 2022
Topic Review
Underwater Image Enhancement and Underwater Biological Detection
For aquaculture resource evaluation and ecological environment monitoring, the automatic detection and identification of marine organisms is critical; however, due to the low quality of underwater images and the characteristics of underwater biological detection, the lack of abundant features can impede traditional hand-designed feature extraction approaches or CNN-based object detection algorithms, particularly in complex underwater environments.
  • 24
  • 05 Sep 2022
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