Predator and prey: The origin of antisubmarine warfare

2021 ◽  
Vol 149 (4) ◽  
pp. A120-A120
Author(s):  
Roy Manstan
Keyword(s):  
Antisubmarine Warfare

Recent Progress of Marine Survey Unmanned Surface Vehicle in China

2019 ◽  
Vol 53 (3) ◽  
pp. 23-29
Author(s):  
Chao Dong ◽  
Xue Li ◽  
Xin-xi Chen ◽  
Jiu-cai Jin ◽  
Cheng-yi Huang
Keyword(s):  
Communication Networks ◽  
Recent Progress ◽  
Rapid Development ◽  
Extreme Environments ◽  
Hydrographic Survey ◽  
Antisubmarine Warfare ◽  
The One ◽  
Mine Countermeasures ◽  
Marine Accidents ◽  
Applied Fields

AbstractBased on the ongoing techniques among control theory, communication networks, and sensor design, unmanned aerial vehicles (UAVs), unmanned undersea vehicles (UUVs) and unmanned surface vehicles (USVs) are experiencing rapid development. Research on these unmanned systems and those intelligent sectors inside has absorbed interests and investments from not only military but also civil organizations. The well-applied fields include surveillance and reconnaissance, surface warfare, antisubmarine warfare, mine countermeasures, oceanic environment monitoring, search and rescue, hydrographic survey, and so on. Comparing with those studies on UAVs and UUVs, the one focusing on USVs was started later and has been developed quickly in the past 20 years. Since 2013, USV has advanced considerably in China, particularly in the marine survey field. Owing to its characteristics of light-weighting, intelligence, and unmanned operations, USV is attractive for shallow water, extreme environments, and marine accidents. This paper comprehensively summarizes the recent progress of the marine survey USV in China. The structure of the paper is divided into three parts. First, we briefly recall the developing history and introduce several excellent USVs of China in recent years. The marine survey USVs invested by the State Oceanic Administration (SOA) are then summarized in the next section, along with the details of hydrographic survey in the South China Sea, Antarctic marine survey, and oil spill emergency response. Finally, the paper points out current deficiencies and future directions of the potential technique.

The Influence of Engine Characteristics on Patrol Aircraft Life Cycle Cost Optimization

1982 ◽  
Author(s):  
A. J. Schuetz
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
High Speed ◽  
Cost Optimization ◽  
Life Cycle Costs ◽  
Design Constraints ◽  
Performance Requirements ◽  
Aircraft Performance ◽  
Antisubmarine Warfare ◽  
Flight Profile

A conceptual design study has been conducted for an all-new, land-based patrol aircraft for the U.S. Navy. The selected propulsion system was a conceptual high-speed turboprop. An antisubmarine warfare mission was chosen for the design flight profile. Probable peacetime utilization was postulated so that the engine duty cycle could be estimated. Aircraft designs were optimized for minimum takeoff gross weight (TOGW) and for minimum life cycle cost (LCC). It was shown that the aircraft performance requirements and design constraints bound the optimization process so tightly that the same point design is obtained for both TOGW and LCC criteria. The contribution of the engine costs to the overall life cycle costs was examined. The sensitivity of the aircraft optimization to the engine characteristics — specific fuel consumption (SFC), length, diameter, and cost — was analyzed. It was determined that SFC is the most significant engine characteristic.

Vibration and Noise Characteristics of an Aircraft-Type Gas Turbine Used in a Marine Propulsion System

1969 ◽  
Author(s):  
R. E. Harper
Keyword(s):  
Gas Turbine ◽  
Vibration Isolation ◽  
Propulsion System ◽  
Noise Levels ◽  
Vibration Data ◽  
Noise Characteristics ◽  
Marine Propulsion ◽  
Antisubmarine Warfare ◽  
Aircraft Type ◽  
Marine Propulsion System

Sound and vibration data measured on a combination diesel gas turbine propulsion system in a 2000-ton antisubmarine warfare ship are presented. The data can be considered representative of the noise levels, both structureborne and airborne, that can be expected in an installation of this or a similar type. Examples of the attenuation of structureborne noise through selected structural joints illustrate the vibration isolation attainable through the use of lightweight aircraft-type structures.

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