In this respect, the main objective of this study is to calculate propeller radiated noise numerically. Therefore, it is important to predict and control the underwater noise characteristics of propellers. The propeller is one of the main sources of underwater noise generated by ships.

this has already been an issue because of their operational requirements. However for special ships, such as naval surface vessels, fishing vessels, submarines, etc. Ships with low noise characteristics will be a must in the near future for almost all ship types.

International Maritime Organisation (IMO) and other bodies have been trying to set up guidelines and regulations to reduce/limit noise levels at sea which influence marine life in particular marine mammals and certain fish types. You may also be interested in:Ĭhina is Developing a Warship of Naval Theorist’s DreamsĬhina is Building the World’s Largest Nuclear Submarine FactoryĬhina’s New Ballistic Missile Submarine Could Change Its Prospects in Nuclear Warįirst Picture of China’s New Nuclear Attack SubmarineĬhinese Navy Stars in Latest U.S.Underwater Radiated Noise Prediction for a Submarine Propeller in Different Flow Conditions These new submarine propulsion systems may not just power China’s submarines of the future, but give Beijing a true superpower’s underwater armada. While the system would be on China’s attack submarine, Chinese SSBNs could also use the rim-drive pumpjet to enhance their stealth and survivability-and, by extension, the credibility of China’s second strike nuclear capability. Secondly, if the system works, the Chinese may have stolen a march on the Americans and British, whose Columbia and Dreadnought nuclear ballistic missile submarine (SSBN) have the option for rim-drive pumpjets, but will not enter service until 2030. First, it illustrates the new openness in Chinese state media to discuss the technology behind previously secretive nuclear submarines, suggesting a greater confidence in showing off new military technology in order to impress domestic and foreign audiences. The reporting is significant for two more reasons. Said another way, these innovations have the potential to strengthen a historic weakness. In turn, Chinese nuclear submarines have lagged behind competitors in their noisiness. carriers and air bases, America’s submarine force has become viewed as its key advantage in any comparison. As China has gained in surface fleet numbers, stealthy planes, and longer-ranged missiles able to target U.S. This combination, if it works, would be a significant gain for China’s naval power. When coupled with quieter reactors like the Type 095’s reported natural circulation reactor, the rim-driven pumpjet and IEPS can drastically reduce the acoustic signature of any SSN. Additionally, IEPS has far fewer moving parts, making them quieter, and thus ideal for use on submarines.

The high electrical output can be used to power motors for the propellers or potentially high-energy weapons. IEPS turns all the output of the ship’s engine into electricity, unlike traditional propulsion designs, which convert engine and reactor output into mechanical action to turn the propeller shaft. Rear Admiral Ma presents a component of the new Chinese IEPS for naval warships the Chinese variant is the world’s first IEPS to run on a medium-voltage, direct-current system.Īlso in the video background was a large piece of electrical machinery, which is part of the PLAN’s Integrated Electrical Propulsion System (IEPS).

Underwater submarine propeller