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Giacomo Nicorelli, Diego Villa and Stefano Gaggero
A pre-swirl fin (PSF), pre-swirl duct (PSD) and wake-equalizing duct (WED) energy-saving devices (ESD) are designed for the Duisburg Test Case (DTC). To this aim, a simulation-based design optimization method, combining RANSE analyses (ship resistance) w...
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Yu Wang, Yujie Wang, Yaxin Li and Cheng Ren
This paper proposes a hybrid propulsion-based small underwater robot for robust trajectory tracking control in a harsh and complex underwater environment. The robot is equipped with a Coanda-effect jet thruster and a pair of propeller-based reconfigurabl...
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Jiawei Zhu, Kenlun Chen, Xuehe Yang, Qijie Zhou, Zhipeng Ye and Yaqiu Li
Propeller-crossing probability analysis is crucial for evaluating the impact resistance and foreign object exclusion capability of turboprop engines. However, due to the complex structure of the propeller and the uncertainties associated with the impact ...
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Yong-Jin Shin, Moon Chan Kim, Kyuong-Wan Lee, Woo Seok Jin and Jin Wook Kim
The maneuverability performance of a KCS with energy-saving devices was investigated. A bulb-type wavy rudder and an asymmetric pre-swirl stator were used as energy-saving devices because their use resulted in considerable efficiency gain. A validated si...
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Zhipeng Du, Qinan Chen, Cong Guan and Hui Chen
Advances in power and propulsion and energy management improvements can significantly contribute to reducing emissions. The International Maritime Organization (IMO) Marpol regulations impose increasingly stringent restrictions on ship?s emission. Accord...
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Jan Geese, Julian Kimmerl, Marc Nadler and Moustafa Abdel-Maksoud
The investigation of cavitating trailing vortices emerging from marine propellers is of great interest in the industry. With the help of computational fluid dynamics (CFD), studying the cavitating trailing vortices may be facilitated. However, limitation...
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Jun Wei, Yong-Bai Sha, Xin-Yu Hu, Jin-Yan Yao and Yan-Li Chen
A trans-medium aircraft is a new concept aircraft that can both dive in the water and fly in the air. In this paper, a new type of water?air multi-medium span vehicle is designed based on the water entry and exit structure model of a multi-rotor UAV. Bas...
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Jiyu Xia and Zhou Zhou
The transition flight of tilt-propulsion UAV is a complex and time-varying process, which leads to great challenges in the design of a stable and robust controller. This work presents a unified model predictive controller, which can handle the full envel...
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Bu-Geun Paik, So-Won Jeong, Young-Ha Park, Jong-Woo Ahn, Ilryong Park and Jein Kim
One of the important things in a ship?s rudder design is the incidence angle of the rudder inflow to improve rudder cavitation performance. In the present study, the rudder inflow is measured by a 3-D LDV (laser Doppler velocimetry) system in a large cav...
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Hongming Cai, Zhuoran Zhang and Shuanghou Deng
Recently, ducted fan unmanned aerial vehicles (UAVs) have attracted considerable attention due to their potential for application in both civil and military missions. Compared with free propellers, the presence of duct can in principle decrease the flow ...
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