|
|
|
|
|
Dimitra Anevlavi, Spiros Zafeiris, George Papadakis and Kostas Belibassakis
This work addresses the effects of blade tip-rake reformation on the performance of marine propellers using a low-cost potential-based vortex-lattice method (VLM) and the high fidelity artificial compressibility CFD-RANS solver MaPFlow. The primary focus...
ver más
|
|
|
|
|
|
|
|
|
|
|
Mina Tadros, Manuel Ventura and Carlos Guedes Soares
This paper presents a comparison between different types of propellers operated in calm water to evaluate their performance behind hulls and in open-water conditions. A bulk carrier is chosen as a case study to perform the simulation and to evaluate the ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Stephan Helma
Undoubtedly, the Wageningen B-screw Series is the most widely used systematic propeller series. It is very popular to preselect propeller dimensions during the preliminary design stage before performing a more thorough optimisation, but in the smaller en...
ver más
|
|
|
|
|
|
|
|
|
|
|
Huilin Ren, Yu Ding and Congbiao Sui
With the increasingly strict international GHG (greenhouse gas) emission regulations, higher requirements are placed on the propulsion system design of conventional ships. Playing an important role in ship design, construction and operation, ship?engine?...
ver más
|
|
|
|
|
|
|
|
|
|
|
Stephan Helma, Heinrich Streckwall and Jan Richter
In common model testing practise, the measured values of the self propulsion test are split into the characteristics of the hull, the propeller and into the interaction factors. These coefficients are scaled separately to the respective full scale values...
ver más
|
|
|
|
|
|
|
|
|
|
|
Stephan Helma, Heinrich Streckwall and Jan Richter
In common model testing practise, the measured values of the self propulsion test are split into the characteristics of the hull, the propeller and into the interaction factors. These coefficients are scaled separately to the respective full scale values...
ver más
|
|
|
|
|
|
|
|
|
|
|
O. N. Kornelyuk
Pág. 74 - 81
Purpose. The article is aimed to: generate 3D models of the screw-propellers under study, as well as the calculation box; carry out a series of numerical experiments to verify the obtained results with the corresponding results of the model experiments; ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Gottfried Sachs
The power required by flapping and fixed wing vehicles in level flight is determined and compared. Based on a new modelling approach, the effects of flapping on the induced drag in flapping wing vehicles are mathematically described. It is shown that fla...
ver más
|
|
|
|
|
|
|
|
|
|
|
Bo Cheng, Shengzhao Pang, Huanyu Ou, Zeyan Hu and Zhaoyong Mao
Underwater vehicles have been widely used in marine exploration and development. A contra-rotating propeller (CRP) can improve propulsion efficiency, eliminate the roll moment of the propeller acting on underwater vehicles, and significantly improve the ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Nanxuan Qiao, Tielin Ma, Jingcheng Fu, Ligang Zhang, Xiangsheng Wang and Pu Xue
The rising interest in the evolvability of electric vertical takeoff and landing (eVTOL) promises substantial potential in the field of urban air mobility (UAM). Challenges in energy storage density and geometry restriction both emphasize the propeller e...
ver más
|
|
|
|
|
|
|
|
|
|
|
Ranjan Vepa
In this paper, the methodology of how a dynamic model of a conventional permanent magnet synchronous motor (PMSM) may be modified to model the dynamics of a high-temperature superconductor (HTS) machine is illustrated. Simulations of a typical PMSM opera...
ver más
|
|
|
|
|
|
|
|
|
|
|
Ranjan Vepa
In this paper, the methodology of how a dynamic model of a conventional permanent magnet synchronous motor (PMSM) may be modified to model the dynamics of a high-temperature superconductor (HTS) machine is illustrated. Simulations of a typical PMSM opera...
ver más
|
|
|
|
|
|
|
|
|
|
|
Jin Gu Kang, Moon Chan Kim, Hyeon Ung Kim and I. Rok Shin
This study provides a comparison of propulsion performance, with a particular focus on efficiency, by varying rake distribution at the tips of propellers. Owing to increased attention to environmental pollution, there is a significant interest in reducin...
ver más
|
|
|
|
|
|
|
|
|
|
|
Sheng Zhang and Wenjing Huang
Holonomic vehicles with wheels such as ball wheels can move in any direction without rotating. For such a system, more driving motors and precise transmission mechanisms are necessary, which makes the control and fabrication complicated. This paper aims ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Shuli Wang, Ziang Li and Qingxin Zhang
The electric seaplane, designed for take-off and landing directly on water, incorporates additional structures such as floats to meet operational requirements. Consequently, during the take-off taxiing phase, it encounters significantly higher aerodynami...
ver más
|
|
|
|
|
|
|
|
|
|
|
Mina Tadros, Roberto Vettor, Manuel Ventura and Carlos Guedes Soares
This study presents a practical optimization procedure that couples the NavCad power prediction tool and a nonlinear optimizer integrated into the Matlab environment. This developed model aims at selecting a propeller at the engine operating point with m...
ver más
|
|
|
|
|
|
|
|
|
|
|
Y. M. Korol,O. M. Kornelyuk
Pág. 80 - 88
|
|
|
|
|
|
|
|
|
|
|
Mengfei Chen, Jinfeng Liu, Qiaorui Si, Yun Liang, Zhongkun Jin and Jianping Yuan
Ducted propeller is a kind of special propeller widely used in unmanned underwater vehicles, its flow characteristics and hydrodynamic noise are very important for marine environmental protection and equipment concealment. The hybrid techniques based on ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Jens Kunze and Allan Paull
A preliminary aerodynamic and thermodynamic analysis of a supersonic propeller driven by an electric motor is performed. The analysis is aimed at determining whether such a system is feasible and further and more detailed investigation is warranted. Rece...
ver más
|
|
|
|
|
|
|
|
|
|
|
Xiaofeng Zeng, Minghai Xia, Zirong Luo, Jianzhong Shang, Yuze Xu and Qian Yin
Stable, quiet, and efficient propulsion methods are essential for underwater robots to complete their tasks in a complex marine environment. However, with a single propulsion method, such as propeller propulsion and bionic propulsion, it is difficult to ...
ver más
|
|
|
|
|
|