scholarly journals Simulation-Based Prediction of Steady Turning Ability of a Symmetrical Underwater Vehicle Considering Interactions Between Yaw Rate and Drift/Rudder Angle

Author(s):  
Jeong-Hoon Park ◽  
Myung-Sub Shin ◽  
Yun-Ho Jeon ◽  
Yeon-Gyu Kim
2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Qingyang Xu ◽  
Chuang Zhang ◽  
Ning Wang

The vessel collision accidents cause a great loss of lives and property. In order to reduce the human fault and greatly improve the safety of marine traffic, collision avoidance strategy optimization is proposed to achieve this. In the paper, a multiobjective optimization algorithm NSGA-II is adopted to search for the optimal collision avoidance strategy considering the safety as well as economy elements of collision avoidance. Ship domain and Arena are used to evaluate the collision risk in the simulation. Based on the optimization, an optimal rudder angle is recommended to navigator for collision avoidance. In the simulation example, a crossing encounter situation is simulated, and the NSGA-II searches for the optimal collision avoidance operation under the Convention on the International Regulations for Preventing Collisions at Sea (COLREGS). The simulation studies exhibit the validity of the method.


Author(s):  
Kyung-Min Seo ◽  
Hae Sang Song ◽  
Se Jung Kwon ◽  
Tag Gon Kim

Modeling and simulation (M&S) has long played an important role in developing tactics and evaluating the measure of effectiveness (MOE) for the underwater warfare system. In simulation-based acquisition, M&S technology facilitates decisions about future equipment procurements, such as a mobile decoy or a torpedo. In addition, assessment of submarine tactical development, during an engagement against a torpedo, can be conducted using M&S techniques. This paper presents a case study that applies discrete event systems specification-based M&S technology to develop a simulation of an underwater warfare system, specifically, an anti-torpedo combat system, to analyze the MOE of the system. The entity models required for M&S are divided into three sub-models: controller, maneuver, and sensor model. The developed simulation allows us to conduct a statistical evaluation of the overall underwater warfare system under consideration, an assessment of the anti-torpedo countermeasure’s effectiveness, and an assessment of tactics development of the underwater vehicle. Moreover, it can be utilized to support the decision-making process for future equipment procurements. In order to analyze the system effectiveness, we performed extensive combat experiments by varying parameters, such as various tactics and weapon performance. The experimental results show how the factors influence the MOEs of the underwater warfare system.


2013 ◽  
Vol 694-697 ◽  
pp. 1641-1645 ◽  
Author(s):  
Hong Wei Zhang ◽  
Liang Hao

Autonomous underwater vehicle (AUV) has become effective equipment in exploring and researching oceanic resources. Due to the limitation of the loading capacity of energy, the working ability of AUV is restricted. In this paper, we optimized the structure and hydrodynamics of the landing AUV II to improve the endurance. By decreasing diameter and increasing length, the resistance of the vehicle can be decreased with the same displacement. Although this may sacrifice the maneuverability, the vehicle is verified to have approving attitude controllability. In order to reduce landing impact, the AUV is conducted to dive to the predetermined depth close to seabed via controlling the attitude and then open water intake valves to get weight and land on sea bottom. Moreover, with the establishment of the dynamic model, the maneuverability and dynamic stability is analyzed and the equilibrium rudder angle is calculated. Sea trial indicates that the AUV could fulfill bottom-sitting and depth-setting exploration successfully.


2021 ◽  
Vol 234 ◽  
pp. 109231
Author(s):  
Jagadeesh Kadiyam ◽  
Santhakumar Mohan ◽  
Devendra Deshmukh ◽  
Taewon Seo

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