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The sloshing of liquid in a partially filled tank is of great concern to aerospace vehicles, road vehicles and ships due to complex nonlinear motion involving the free surface of the liquid. Sloshing is a type of violent liquid motion that is created by forces such as an impact and breaking waves. Oscillation of the liquid in the vessel may threate...
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Context 1
... this experiment, the range of frequency was chosen the wave spectrum and the natural frequency of the membrane tank. The test conditions for harmonic motion are listed in Table 3. In addition, three frequencies of the motion of the tank near the natural frequencies of the tank are examined. ...Similar publications
In order to understand the navigation safety risks of LNG ships in inland waterways, the paper combines the general accident risk assessment and the specific navigation environment of inland rivers[1], and analyzes the probability of collision accidents[9]. Combined with the characteristics of the specific navigation environment, to construct a hie...
Citations
... These coefficients were acquired based on measurements from maneuvering trials, in order to validate the accuracy of the equations used. Additionally, more advanced technologies were utilized for identifying the hydrodynamic coefficients, such as, Artificial Neural Network (ANN) (Bhattacharyya and Haddara, 2006), Feed-forward Neural Network with Chebyshev orthogonal basis function (Zhang and Zou, 2013), Recurrent Neural Network (Nguyen et al., 2020), and Support Vector Machines (SVM) (Luo et al., 2016;Wang et al., 2019). ...
The evaluation of ship maneuverability characteristics typically involves the mode tests, direct CFD computations , and system-based simulations. The three methods have been widely used in traditional vessels. However, the trimarans, which are appended with the waterjet propulsion systems, have been rarely researched and assessed comprehensively based on the above methods. This paper used a free-running waterjet-propelled trimaran model test to obtain the constant turning and zigzag maneuvering performance in calm water conditions. By embedding the speed and heading controllers in a CFD program, along with the region moving method, a direct free-running maneuvering CFD model was established on a waterjet-propelled trimaran. Compared to the free-running model tests, the simulation results indicated that an empirical hydrodynamic derivative-based Maneuvering Model Group (MMG) method produced the fastest results but lacked accuracy in simulating a constant turning diameter, making it suitable for fast maneuvering estimation and prediction during the design stage. Conversely, a direct force (moment)-based CFD model required more accurate input estimates to acquire acceptable simulated results. Meanwhile, a body force-based CFD model considered more complex nonlinear impacts and was most similar to reality, achieving better agreement with the experimental results. Additionally, the simulations of the direct free-running maneuvering CFD model in calm and wavy water proved advantageous in examining hull-propulsor interaction during physically similar maneuvering processes where the model test was inadequate.
