Numerical study on the cavity characteristics and impact loads of AUV water entry |
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| Institution: | 1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an, 710072, PR China;2. Key Laboratory of Unmanned Underwater Vehicle, Northwestern Polytechnical University, Xi’an, 710072, PR China;3. School of Civil and Construction Engineering, Oregon State University, Corvallis, OR, 97331, United States;1. Department of Aerospace Engineering, Harbin Engineering University, Harbin, Heilongjiang, 150001, PR China;2. College of Automation, Harbin Engineering University, Harbin, Heilongjiang, 150001, PR China;1. High Velocity Impact Dynamics Lab, Harbin Institute of Technology, Harbin, 150080, China;2. School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;3. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai, 200240, China;4. Jiujiang University, School of Civil Engineering and Urban Construction, Jiujiang, 332005, China;1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi''an, 710072, PR China;2. Key Laboratory of Unmanned Underwater Vehicle, Northwestern Polytechnical University, Xi''an, 710072, PR China;1. Mechanical Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran;2. Mechanical Engineering Department, Quchan University of Advanced Technology, Quchan, Iran |
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| Abstract: | The high-speed water entry process of an autonomous underwater vehicle (AUV) has a strong impact nonlinearity, and a cavity formed by air and water will often be generated as part of the entry process. The shape of the water-entry cavity plays an important role in the load characteristics and stability of the water-entry trajectory. In this paper, a numerical model for describing the cavity and impact load characteristics of a high-speed water-entry AUV is established. The simulation results such as cavity shape and impact load are compared with experimental data. The good agreement between the numerical results and those of the experiments reveals the accuracy and capability of the numerical algorithm. Subsequently, the arbitrary Lagrange-Euler (ALE) numerical algorithm is used to simulate and analyse the variation laws of the cavity characteristics and impact loads with different head shapes, water-entry velocities, water-entry angles and angles of attack. The results obtained in this study can provide a good reference for the trajectory control and structural design of the AUV. |
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| Keywords: | AUV Water entry ALE Cavity characteristics Impact loads |
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