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3rd International Conference on Defence Technology, ICDT 2022

作者： Liu, Ting Chen, Changhai Cheng, Yuansheng School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Naval Architecture & Ocean Engineering Hydrodynamics Wuhan430074 China

In this study, a dynamic enhancement stress model for cellular materials was derived from kinematics perspective, which directly reflected the influence of inertia effect on dynamic stress. Based on the proposed dynamic enhancement stress model, a densification strain calibration (DSC) analytical model with wider applicability for cellular materials was established, in which stress-dependent densification strain was employed. FE simulations for linear hardening and power hardening material under dynamic impact were conducted to validate DSC model. Comparing with idealized model (rigid, perfectly-plastic, locking model), dynamic plateau stress obtained by using of DSC model matched better with numerical results. Moreover, experimental results in published literature were employed to further confirm the reliability of DSC model in predicting projectile deceleration and final crushing depth. Finally, DSC model was used to predict dynamic response of gradient PVC foam, and the relative errors of final crushing depth to numerical results was within 8%. © Published under licence by IOP Publishing Ltd.

关键词： Analytical models

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Forces of fully nonlinear interfacial periodic waves on a cylindrical pile in a two-layer fluid with free-surface boundary conditions

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Journal of ocean engineering and Science 2023年第6期8卷 662-674页

作者： Jiyang Li Zeng Liu Jie Cui School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiangJiangsu 212000PR China School of Naval Architecture and Ocean Engineering Huazhong University of Science and TechnologyWuhan 430074PR China Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics(HUST) Wuhan 430074China Hubei Provincial Engineering Research Center of Data Techniques and Supporting Software for Ships Wuhan 430074PR China

In the frame of fully nonlinear potential flow theory,series solutions of interfacial periodic gravity waves in a two-layer fluid with free surface are obtained by the homotopy analysis method(HAM),and the related wave forces on a vertical cylinder are *** solution procedure of the HAM for the interfacial wave model with rigid upper surface is further developed to consider the free surface *** forces of nonlinear interfacial periodic waves are estimated by both the classical and modified Mori-son *** is found that the estimated wave forces by the classical Morison equation are more conservative than those by the modified Morison’s formula,and the relative error between the total inertial forces calculated by these two kinds of Morison’s formulae remains over 25%for most cases unless the upper and lower layer depths are both large *** demonstrates that the convective acceleration neglected in the classical Morison equation is rather important for inertial force exerted by not only internal solitary waves but also interfacial periodic *** of these should further deepen our understanding of internal periodic wave forces on a vertical marine riser.

关键词： Interfacial periodic waves Wave force Cylindrical pile Homotopy analysis method Morison equation

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Research on the Effect of Tip Clearance on the Hydrodynamic Performance of an Axial Flow Pump 33rd

Research on the Effect of Tip Clearance on the Hydrodynamic ...

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33rd International ocean and Polar engineering Conference, ISOPE 2023

作者： Zou, Yanlin Deng, Weihua Wang, Xunming Feng, Dakui School of Naval Architecture & Ocean Engineering Key Laboratory of Ship and Ocean Hydrodynamics of Hubei Province Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781880653807

In this paper, numerical investigations of an axial flow pump with different tip clearances (0.6, 1.2, 1.8, 2.4, 3.0 mm) at different flow rates (0.42 ~ 0.5 m3/s) are carried out. The SST k-ω turbulence model together with the sliding grid technique are adopted. The uncertainty analysis is carried out with a tip clearance of 0.6 mm to verify the accuracy of the numerical solver. The comparisons of hydrodynamic performance for the axial flow pump with different tip clearances are presented in detail. As the tip clearance increases, the thrust and propulsion efficiency of the axial flow pump can be reduced significantly. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Uncertainty analysis

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Numerical Study on Scale Effect of Full-scale Submarine Sailing Near Free Surface in Stratified Fluid 34th

Numerical Study on Scale Effect of Full-scale Submarine Sail...

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34th International ocean and Polar engineering Conference, ISOPE 2024

作者： Cui, Hujia Kong, Yuan Wang, Xianzhou Yuan, Ye School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology China Key Laboratory of ship and ocean hydrodynamics of Hubei Province Hubei Wuhan China China Ship Development and Design Center Wuhan China

ISBN: (纸本)9781880653784

The density is not constant in the real environment of submarine navigation. So it’s necessary to study the hydrodynamic characteristics and wake of full-scale submarine in weakly stratified fluid. For the purpose of simulating the submarine sailing in the real sea condition, an unsteady RANS equation has been solved with realizable k − e model and a weak density stratification has been applied. Firstly, the grid convergence study has been conducted to verify the numerical method and appropriate grids were selected. And the density of the fluid was defined as a function of submerged depth. Then the resistance coefficients and free surface of full-scale submarine in uniform and stratified fluids have been compared to study the influence of density stratification. Finally, pressure distributions on submarine surface and free surface waves at full- and model-scale have been compared. The results demonstrate that the phenomenon of resistance increase also exists in weakly stratified environment. Moreover, the scale effect on pressure distribution and free surface can be observed at the positions where the submarine surface curvature changes drastically. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Computational fluid dynamics

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Research on Propulsion Model of Azimuth Thruster Considering both Drift and Steering Angles 34th

Research on Propulsion Model of Azimuth Thruster Considering...

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34th International ocean and Polar engineering Conference, ISOPE 2024

作者： Zuo, Hongji Huang, Yaofeng Wang, Xianzhou Guo, Lixiang School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology China Key Laboratory of ship and ocean hydrodynamics of Hubei Province Hubei Wuhan China China Ship Development and Design Center Wuhan China

ISBN: (纸本)9781880653784

Due to the effect of the strong oblique flow, the traditional Maneuvering Modeling Group (MMG) model cannot provide accurate prediction of the maneuvering motion for Azimuth-Stern-Drive (ASD) tugs. This study establishes a new propulsion model of azimuth thruster, which is obtained by interpolation of the thrust calculated under a series of different speed and drift angles and steering angles. Compared with the traditional MMG model, the improved MMG model improves the prediction accuracy of turning performance for ASD tugs by more than 10 %. It has been verified that this model can be used for subsequent parametric research. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Computational fluid dynamics

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Load Calculation of Cylinder Moving in Waves 34th

Load Calculation of Cylinder Moving in Waves

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34th International ocean and Polar engineering Conference, ISOPE 2024

作者： Li, Jing Wang, Junyi Wang, Xianzhou Wang, Qing School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology China Key Laboratory of ship and ocean hydrodynamics of Hubei Province Hubei Wuhan China Wuhan Second Ship Design and Research Institute Hubei Wuhan China

ISBN: (纸本)9781880653784

In order to investigate the wave load of cylinder such as masts on submarines, this study compares numerical simulations of cylinder under different submerged depths and speeds in irregular wave and calm water. Before the study, validation of the numerical method was conducted for time-steps/grid independent studies and uncertainty analysis of the numerical simulation results includes evaluation of significant wave height. Then, the numerical loads in wave conditions are compared with those in calm waters, and the numerical wave results are also compared with those calculated by Morison formula. Finally, the discipline of wave load under different conditions and the ratios of numerical results to Morison formula results are concluded. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Uncertainty analysis

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A beam with an attached damping layer with an acoustic black hole profile 14

A beam with an attached damping layer with an acoustic black...

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14th International Conference on Recent Advances in Structural Dynamics, RASD 2024

作者： Wan, Zhiwei Zhu, Xiang Li, Tianyun Liu, Xinru School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics Wuhan430074 China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai200240 China

An acoustic black hole (ABH) structure whose thickness varies according to a power law has received extensive attention in vibration reduction. However, ABH cannot be used as the primary bearing component in engineering, as the thickness reduction of ABH itself reduces its stiffness. In this article, the vibration characteristic of a beam with an acoustic black hole damping layer is studied and compared with a damping layer with uniform thickness. The beam and damping layer are based on the Timoshenko beam theory, using virtual springs to connect each other. The correctness of the proposed method is verified through the finite element method. The case studies show the proposed composite beam structure has lighter mass and lower vibration levels, compared with the beam attached with uniform damping layer. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Damping

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A Study of the Double-Side Induction Line Heating for Shipbuilding 32nd

A Study of the Double-Side Induction Line Heating for Shipbu...

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32nd International ocean and Polar engineering Conference, ISOPE 2022

作者： Chang, Lichun Zhao, Yao Yuan, Hua School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Hubei Wuhan China Shanghai China Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics Hubei Wuhan China

ISBN: (纸本)9781880653814

The double-curved plates forming is an important task in shipbuilding, and the line heating plate forming method is the traditional complex curved plate forming process. This paper proposes the double-sided electromagnetic induction line heating process used in plate forming. By using this process, the in-plane shrinkage deformation is decoupled from the bending deformation. Using the thermo-elastic-plastic finite element method, we study the characteristics of the double-sided heating processing under the conditions of different process parameters and different initial curvatures. © 2022 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Finite element method

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Research of Ship Shaft Three-dimensional Point Cloud Completion through GAN Inversion 33rd

Research of Ship Shaft Three-dimensional Point Cloud Complet...

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33rd International ocean and Polar engineering Conference, ISOPE 2023

作者： Jianing, Wang Li, Tianyun Zhu, Xiang Shang, Baoyou School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Wuhan China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai China Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics Wuhan China

ISBN: (纸本)9781880653807

The quality and duration of the ship’s construction have an impact on the efficiency and precision of the propulsion shafting alignment. A ship’s shaft system alignment requires precise positioning parameters. The ship’s shaft system’s installation area is, however, extremely constrained, and the model created by scanning is frequently a partial point cloud shape from which precise positional data cannot be determined. Most techniques for 3D shape completion are learnt through supervised learning. In order to complete the shape of the ship shaft system point cloud, the Generative Adversarial Network (GAN) inversion is introduced in this research. Based on a ship shaft assembly test stand, a series of point cloud data was collected to simulate an actual flange scanning situation and the data was studied using GAN Inversion to complement the data. The results were analyzed. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Generative adversarial networks

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Vibration Suppression of Acoustic Black Hole Beam by Piezoelectric Shunt Damping with Different Positions 10th

Vibration Suppression of Acoustic Black Hole Beam by Piezoel...

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10th International Conference on Wave Mechanics and Vibrations, WMVC 2022

作者： Wan, Zhiwei Zhu, Xiang Li, Tianyun Chen, Sen Fu, Junyong School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics Wuhan430074 China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai200240 China

ISBN: (纸本)9783031157578

In this talk, a piezoelectric shunt damping is introduced to an acoustic black hole beam to form an acoustic black hole (ABH) piezoelectric composite structure, and its vibration characteristics are analyzed by a semi-analytical method. Based on the Hamilton principle, the Mexican hat wavelet is used as the shape function, and the energy method is used to solve the free and forced vibration of the acoustic black hole beam structure with PZT. The present results agree with those of the finite element method. To improve the effectiveness of the acoustic black hole, an external shunt circuit is connected to the PZT and shunt damping with the local resonance mechanism is introduced. The vibration characteristics of the beam with shunt damping and ordinary damping are compared and analyzed. The vibration suppression of ABH beam by piezoelectric shunt damping with different positions is discussed, and the optimal position is obtained. The designed acoustic black hole beam with shunt damping is significantly attenuated than the traditional damping layer acoustic black hole beam, which provides a new idea for the low-frequency vibration control of the acoustic black hole structure. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Damping

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