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About Journal
Founded in 1979, Monthly
Governed by:
China State Shipbuilding Corporation Limited (CSSC)
Sponsored by:
Shanghai Marine Equipment Research Institute (SMERI), Chinese Society of Naval Architects and Marine Engineers (CSNAME)
Published by:
Editorial Office of Ship Engineering
Email: cbgc@cssmc.cn
ISSN 1000-6982
CN 31-1281/U
Path Planning of Underwater Vehicle Based on Improved Artificial Potential Field Method
YAO Yanjie;LI Yizhuo;YI Zhengyao;ZHANG Hanbing;MU Gang;ZHANG Feicheng;[Purpose] In order to solve the problems of traditional artificial potential field method(APF) in underwater vehicle path planning, such as unreachable target, easy to collide with obstacles, and easy to fall into local extreme points, [Method] the distance influence factor is used to improve the gravity function to solve the problem that the underwater robot easily collides with obstacles when the distance from the target point is too far. The inaccessible target problem is solved by improving the repulsive potential field function to alleviate the rapid increase of repulsive force; the simulated annealing algorithm is used to set the virtual target and make the robot jump from the local extreme point. For the problem that the turning path is not smooth enough due to the large turning angle at important turning positions, the cubic B-spline algorithm is selected for adjustment, and the optimized algorithm makes the turning path smoother. [Result] The simulation results before and after the improvement show that the fusion improved artificial potential field method can design a conflict-free path for the robot to safely reach the target point. [Conclusion] The research results can provide some references for underwater vehicles to do inspection work.
Current Research and Development Trends of Key Technologies in Scientific Winch Systems
LIN Shanying;LIAN Lizhi;LI Zehua;LI Wenhua;YE Hongxia;[Purpose] As critical operational equipment in marine scientific research, scientific winch systems perform essential functions in launching and recovering the underwater equipment for deep-sea resource exploration, geological sampling, and environmental monitoring. With the accelerated development of global marine resources and the continuous expansion of research vessel fleets, the performance demands on winch systems have increased, and market demand has shown a significant growth trend. [Method] Functions and application scenarios of different scientific research winch systems are reviewed, key technologies are summarized, and future development trends are explored. [Result] The application of key technologies such as lightweight design, multi-layer winding, cable arrangement, and wave compensation in the scientific research winch system can significantly improve the performance and operational capabilities of the winch. The scientific research winch system will develop towards heavy-duty, intelligent, and modular directions. [Conclusion] The research results can provide some references for the design optimization and related technical improvement of future scientific research winch systems.
Vortex-Induced Vibration Response Characteristics of Marine Risers Under Action of Superimposed Flow
ZHANG Jintao;SANG Song;DU Youwei;WU Xiangzhao;ZHANG Wenlin;[Purpose] In order to study the vortex-induced vibration response characteristics of marine risers under the action of ocean currents, [Method] based on computational fluid dynamics(CFD) and computational structural dynamics(CSD), a viscous flow field calculation model is established in the fluid domain using the slicing method and overlapping mesh method, and a three-dimensional calculation model of the riser is established in the riser structural domain using finite element method. The bidirectional and sequential coupling of the fluid domain and the riser structure is achieved by user defined function(UDF) programming, and a numerical model of fluid-structure coupling of pipe vortex-induced vibration is constructed, and the accuracy of the numerical model is verified. [Result] The results indicate that the dimensionless displacements in both the transverse and downstream directions of the riser decrease continuously with the increase of the superimposed flow vibration frequency. The difference is that the decrease in the transverse direction is small, while the decrease in the downstream direction is large. There is a delay effect in the transverse displacement of the riser, and the root mean square value of the dimensionless displacement in the transverse flow during the deceleration phase is much larger than that during the acceleration phase; there is also a delay effect in the displacement changes in the downstream direction. When the displacement of the riser in the downstream direction reaches a relatively stable state, the vibration trajectory is in the shape of an "8". [Conclusion] The research results can provide some references for the design of deep-sea risers.
Simulation and Analysis of Control Strategy for Carbon Dioxide Absorption Device on Deep-Sea Manned Platform
GUO Yangyang;XIA Bin;ZHOU Xintao;ZHAO Yuanhui;XU Meng;[Purpose] In order to improve the energy utilization efficiency of the carbon dioxide absorption device, [Method] a digital model of the carbon dioxide absorption device and standard test bench of the deep-sea manned platform are established. A control strategy for the carbon dioxide absorption device of the deep-sea manned platform is proposed, taking into account both the volume fraction of carbon dioxide and the power of the device. The effects of a constant air volume strategy, a stage control strategy, and an intermittent control strategy on the carbon dioxide volume fraction and the device power under standard test bench conditions are analyzed. [Result] The results indicate that constant air volume control and stage control can achieve quantitative control of the carbon dioxide volume fraction.Under the same control requirements, the total power consumption of constant air volume control is lower than that of stage control; Stage control and intermittent control can achieve interval control of carbon dioxide volume fraction. For the same control requirements, the total power consumption of intermittent control is lower than that of stage control; for constant air volume control, the lower the target volume fraction, the greater the air volume demand, and the higher the power consumption. For intermittent control, selecting the minimum air volume that meets the requirements can reduce the power consumption and fan opening and closing frequency, and improve the device reliability; By changing the stage control strategy, the air volume level and volume fraction limit can be adjusted to achieve quantitative volume fraction control or interval control, respectively; For quantitative control of volume fraction, the smaller the control volume fraction, the shorter the running time; For volume fraction interval control, the larger the air volume, the shorter the running time. [Conclusion] The research results can provide some references for the control strategy of carbon dioxide absorption devices on deep-sea manned platforms.
Analysis of Drag Reduction Characteristics of Air Planing Boat
DONG Mingyu;TONG Zhe;CHE Linyuan;XING lei;[Purpose] To reduce the power consumption of high-speed planing boats, [Method] a numerical calculation and analysis method based on viscous fluid mechanics is used to simulate the multiphase flow model of volume of fluid(VOF), and the results are compared with the experimental results of the target ship type. On this basis, the influence of changes in ventilation and speed on the frictional resistance and total resistance of planing boats is studied, and the resistance characteristics of gas bearing planing boats are analyzed. [Result] The results show that when the volume Froude number Fr_▽ is the same, with the increase of ventilation volume, the reduction rates of both total resistance and frictional resistance show a significant upward trend; when Fr_▽≤1.3, the drag reduction rate tends to level off and slightly decrease after reaching a certain value; when Fr_▽>1.3, the increase of ventilation volume leads to a significant increase in the drag reduction rate. At the same gas flow rate, as Fr_▽ increases, the drag reduction rate shows a fluctuating state with obvious peaks and valleys. [Conclusion] The research results can provide some references for analyzing the factors affecting the drag reduction effect of gas reservoirs.
