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A hybrid underwater glider(HDUG) is developed based on a folding propeller. The blades of the propeller can fold and unfold according to the motor work or not. When it stop spinning, the blades will come to a rest position. The hydrodynamic performance will vary with the position of the blades, thus the transit efficiency of the HDUG will also vary. So there must be an optimal transit efficiency for...
Under the influence of the sea current, the hydrodynamic performance of the propeller varies with the changing of the incoming flow direction. Aiming to obtain the hydrodynamic performance accurately, the thrust and load characteristic of AUV propeller is investigated under the conditions that different angles incoming flow go through the plane of propeller. First, the visual-physical model is built...
Underwater vehicle controller design proves difficult for time varying, nonlinear dynamics, coupled model and uncertain flow. Also it is hard to construct the nonlinear coupled uncertain model. Fortunately, we find a simple method to deal with that problem. Variable universe fuzzy control algorithm is superior in model-independent and nonlinear control. Also it is a simple and universal method. It...
In this paper, meshing impact on numerical simulation of marine systems is investigated. Different mesh topologies, meshing spacing, meshing refining area are discussed. Different shaped bodies such as ball, AUV and complicated motion such as propeller rotating are simulated with compared meshes in the paper. And its converging time, solution accuracy, and local domain flow characters are compared...
Hybrid underwater glider (HUG) combines behaviors of autonomous underwater gliders and those of traditional autonomous underwater vehicles. HUG can dive along a saw-tooth trajectory in the gliding mode and autonomously cruise in the level-flight mode. In the study of HUG dynamics, the mathematical model and the physical parameters of the vehicle are assumed to be deterministic. The simulation results...
Propeller ventilation is one of the main reasons for the widespread mechanical failures of thrusters, with costly repairs and increased vessel down-time. Most of existing ventilation detection methods have been designed based on the dynamics/control modelling of water and the propeller, and they generally require information or accurate estimates of vessel specific parameters. The main challenges...
Coupling design of rim-driven integrated motor propulsor for vessels and underwater vehicle is presented in this paper. The main characteristic of integrated motor propulsor is that the motor is integrated in the duct of propulsor. So the coupling design of motor and propulsor is the key to the overall design. Considering the influence of the motor and duct size, the propeller was designed, and the...
Among the existing outstanding gliders, Hybrid Underwater Gliders (HUGs), which are often equipped with a propeller as the propulsion system, are the typical ones with better performance. However, studies on the HUG showed that the glider was very easy to yaw left or right, while the pure buoyancy-driven gliders didn't show such problem. The most possible reason may be from the propeller. In this...
This paper will focus on typical diesel electric propulsion systems found on board offshore vessels. The offshore vessels category include vessels such as PSV (Platform Supply Vessels), AHTS (Anchor Handling Tug Supply vessels) and CSV (Construction Support Vessels). In short at least all thrusters and often also the main propulsion is electric. Hence, the electric energy is produced on-board by medium...
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