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Dynamic Properties of Steel Catenary Riser near Touchdown Point Under Coplanar Vessel Heave and Vortex Induced Vibration

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China Ocean engineering 2023年第2期37卷 288-298页

作者： ZHANG Xiang-rui WANG Kun-peng JIANG Da-peng TANG Kai LI Yu-long Marine Design and Research Institute of China Shanghai 200011China School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 510275China

The present study establishes a simple numerical model for the coupled response of a steel catenary riser(SCR) subjected to coplanar vessel motion and vortex-induced vibration(VIV). Owing to the large deflection of the SCR, the geometric nonlinearity is considered in this model. The hydrodynamic force comprises the excitation force and hydrodynamic damping, where the excitation force that only exists when the non-dimensional frequency is located in the lock-in range, is associated with the VIV. The hydrodynamic force model is validated based on the published VIV test *** for the seabed resistance at the touchdown zone(TDZ), integrated with an initial seabed trench, the hysteretic feature is modeled. Based on the model, the study emphasizes on the coupled response characteristics near the touchdown point(TDP) induced by coplanar vessel heave and VIV, and analyzes the sensitivity of the coupled response to the heaving amplitude and frequency. It is found that with the increase of the heave amplitude and frequency, the VIV can be obviously mitigated, but the heave-related response in the coupled analysis seems to be close to that in the heave-only simulation. Finally, the fatigue damage near TDP is parametrically investigated based on the separate analysis and the coupled analysis. The results demonstrate that the coupled effect plays a significant role in the fatigue assessment near TDP. Besides, the proportion of the coupled effect accounting for the total fatigue damage decreases with the increasing seabed stiffness, while increases with the increasing seabed trench depth.

关键词： vessel heave vortex induced vibration coupled effect steel catenary riser(SCR)-seabed interaction seabed trench

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Motion Response and Ice Load Analysis of an Arctic Mooring Platform Based on Multi-Dilated Polyhedron Elements 34th

Motion Response and Ice Load Analysis of an Arctic Mooring P...

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34th International Ocean and Polar engineering Conference, ISOPE 2024

作者： Zhang, Bihui Zhao, Jiancheng Zhang, Anwen Hong, Yong Wang, Yi Zhang, Jinlong Zhang, Huizhong School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology China School of Naval Architecture and Ocean Engineering Dalian Maritime University China Power China Huadong Engineering Company United Arab Emirates

ISBN: (纸本)9781880653784

The polar environment is affected by various factors, including waves, ocean currents, platform motion, and others. As a result, broken ice can drift, posing a complex and serious threat to the operational integrity of polar mooring platforms. To investigate the motion and loading characteristics of a moored platform under the influence of waves and ocean currents, a three-dimensional (3D) numerical wave pool is constructed using computational fluid dynamics (CFD) technology. The numerical model incorporates the velocity inlet wave-making method to ensure accurate simulation of wave conditions, providing a precise representation of wave behaviour in the study. The fluid control equations are discretely solved using the finite volume method, and the free liquid surface is captured through the implementation of the fluidvolume method. Furthermore, nonlinear wave theory is incorporated into the numerical model, ensuring the inclusion of applicable conditions specific to Stokes fifth-order waves. This integration guarantees an accurate representation of wave behaviour and significantly enhances the overall fidelity of the simulation. The numerical model employs a modified version of the spring-damper model to simulate discrete particle contact and the arrangement of the catenary to achieve mooring of the platform. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Ice

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Loads and Dynamic Response Characteristic on FPSO Under Internal Solitary Waves

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China Ocean engineering 2024年第5期38卷 785-796页

作者： ZHANG Rui-rui LI Cui PU Chun-rong LIU Qian YOU Yun-xiang School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China China Resources(Nanjing)Municipal Design Co. Ltd.Nanjing 315100China State Key Laboratory of Ocean Engineering Shanghai Jiaotong UniversityShanghai 200240China

According to the established prediction model of internal solitary wave loads on FPSO in the previous work,the lumped mass model and the movement equations of finite displacement in time domain,the dynamic response model of interaction between internal solitary waves and FPSO with mooring lines were *** calculations and analysis,time histories of dynamic loads of FPSO exerted by internal solitary waves,FPSO’s motion and dynamic tension of mooring line were *** effects of the horizontal pretension of mooring line,the amplitude of internal solitary wave and layer fluid depth on dynamic response behavior of FPSO were *** was shown that the internal solitary waves had significant influence on FPSO,such as the large magnitude horizontal drift and a sudden tension *** internal solitary wave of −170 m amplitude in the ocean with upper and lower layer fluid depth ratio being 60:550,the dynamic loads reached 991.132 kN(horizontal force),18067.3 kN(vertical force)and−5042.92 kN·m(pitching moment).Maximum of FPSO’s horizontal drift was 117.56 *** increment of upstream mooring line approached 401.48 kN and that of backflow mooring line was−140 ***,the loads remained nearly constant with different pretension but increased obviously with the changing amplitude and layer fluid depth *** increments of mooring lines also changed little with the pretension but increased rapidly when amplitude and layer fluid depth ratio ***,FPSO’s motion increased quickly with not only the horizontal pretension but also the amplitude of internal solitary wave and layer fluid depth ratio.

关键词： internal solitary wave(ISW) dynamic response FPSO dynamic loads tension increment

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Research on the Influence of Wing Edge Sharpness on the Hydrodynamic Performance of a Sagging Plate 34th

Research on the Influence of Wing Edge Sharpness on the Hydr...

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34th International Ocean and Polar engineering Conference, ISOPE 2024

作者： Liu, Yajiao Dou, Peilin Li, Xiu School of Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang China

ISBN: (纸本)9781880653784

This article designs four types of heave plates with increasing wing edge sharpness, and numerically simulates the hydrodynamic characteristics of forced sinusoidal oscillation of heave plates. The force history curves and hydrodynamic coefficients of forced sinusoidal oscillation of heave plates with different wing edge sharpness at different KC numbers and frequencies are obtained;Secondly, the velocity cloud map of the process of generating wake vortices on the oscillating plate was analyzed. Based on the above research, it is shown that as the sharpness of the wing edge of the heave plate increases, the rate of vortex shedding at the wake of the heave plate increases, thereby improving the hydrodynamic performance of the heave plate. This provides a reference for the design and optimization of the heave plate of offshore floating platforms in practical engineering. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Vortex shedding

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Elasto-Plastic FEM Analysis of Alternating Rock Mass Based by Cosserat Constitutive Model and Its Numerical Simulation 4th

Elasto-Plastic FEM Analysis of Alternating Rock Mass Based b...

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4th International Symposium on Automation, Mechanical and Design engineering, SAMDE 2023

作者： Zhang, Jiancheng Jiang, Xueguo Jia, Zikang Cao, Maosen Zhang, Ziwen Yang, Chen School of Naval Architecture and Civil Engineering Jiangsu University of Science and Technology Jiangsu Zhangjiagang215600 China Industrial Technology Research Institute of Zhangjiagang Jiangsu University of Science and Technology Jiangsu Suzhou215600 China School of Civil Engineering and Architecture Jiangsu University of Science and Technology Zhenjiang212100 China The College of Mechanics and Materials Hohai University Jiangsu Nanjing211100 China

ISBN: (纸本)9783031626630

Classical yield criterions cannot be applied directly to Cosserat continua since the strain tensor and stress tensor in Cosserat continua are asymmetric. In this work, the strain tensor and stress tensor were decomposed into symmetric and anti-symmetric components, and the formulae of stress invariants were modified for Cosserat continua. Mohr-Coulomb yield criterion for Cosserat continua was established in detail, and the elasto-plastic FEM (Finite element method) based on the yield criterions was addressed as well. Then, the model was implemented into a Cosseart FEM program based on MATLAB platform. A numerical example on the underground cavern in inter-layered rock mass stability under gravity shows the superior behavior of the established Mohr-Coulomb yield criterion, and demonstrates that the Cosserat model incorporating an internal length scale can resolve the mesh-dependence that classical continua encounter in the strain localization problem. Moreover, it was shown that the FEM program based on MATLAB and Cosserat model was right and effective. The results reveal that, compared with the conventional continuum model, the proposed Cosserat model better reflects elasto-plastic FEM analysis of alternating rock mass, which is closer to the actual situation. The results aid in a better understanding of the mechanical properties of alternating rock masses. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Stress tensor

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Analysis of Wave Absorbing Effect of Numerical Wave Tank

Analysis of Wave Absorbing Effect of Numerical Wave Tank

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2023 International Joint Conference on Civil and Marine engineering, JCCME 2023

作者： Liu, Xiaohan Liu, Tianyu Xu, Gang School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang212100 China

ISBN: (纸本)9781839539954

Numerical wave tanks have a wide range of applications in marine and offshore engineering, such as: hydrodynamic modeling and simulation of ships and marine structures in the marine environment. Vibration and noise analysis of ships and marine structures. Motion control research of ships and marine structures. As an important experimental device for simulating fluid motion, numerical water wave tank has been widely used in various fields. Wave generation and wave absorbing are two key techniques for numerical wave tank. Wave generation is usually achieved by exciting waves on the water surface, while wave absorbing is to absorb the generated waves by some measures. Wave generation is the first step of numerical wave tank simulation. This paper mainly introduces the research status of the wave absorbing effect of numerical wave tanks, and discusses the application of numerical wave tanks in wave absorbing. Through software simulation, different variables were compared to verify the effectiveness of the numerical wave tank wave suppression system. The significance of researching wave generation and wave absorbing in numerical wave tank lies in improving the simulation capability and practical application value of numerical wave tank. In addition, the continuous development of wave generation and wave absorbing contributes to some research fields. Therefore, the research and application of wave generation and wave absorbing in numerical wave tank have important theoretical and practical significance. © The Institution of engineering & technology 2023.

关键词： Ships

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Research on the response of underwater explosion liquid tank structure based on RKPM method 8

Research on the response of underwater explosion liquid tank...

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2024 8th International Conference on Hydrodynamics, Energy and Electric Power System, HEEPS 2024

作者： Zhao, Dewei Zhao, Chuanqi Chen, Xin Marine Design and Research Institute of China Shanghai200011 China School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212003 China School of Materials Science and Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212003 China

This work establishes a three-dimensional fluid-structure coupling calculation model for the response of SPH-RKPM underwater explosion structures and verifies its effectiveness. Using the established numerical model, the dynamic response of the water-containing liquid tank structure under underwater explosion shock wave load was modeled and calculated, and the response characteristics of the water-containing liquid tank under different detonation distances were discussed. The response law of the water-containing liquid tank structure under shock wave load is summarized. © Published under licence by IOP Publishing Ltd.

关键词： Underwater explosions

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Reliability analysis for wireless communication networks via dynamic Bayesian network

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Journal of Systems engineering and Electronics 2023年第5期34卷 1368-1374页

作者： YANG Shunqi ZENG Ying LI Xiang LI Yanfeng HUANG Hongzhong School of Naval Architecture and Ocean Engineering Huazhong University of Science and TechnologyWuhan 430074China School of Mechanical and Electrical Engineering University of Electronic Science and Technology of ChinaChengdu 611731China China University of Petroleum at Karamay Karamay 834000China

The dynamic wireless communication network is a complex network that needs to consider various influence factors including communication devices,radio propagation,network topology,and dynamic *** works focus on suggesting simplified reliability analysis methods for these dynamic *** one of the most popular modeling methodologies,the dynamic Bayesian network(DBN)is ***,it is insufficient for the wireless communication network which contains temporal and non-temporal *** this end,we present a modeling methodology for a generalized continuous time Bayesian network(CTBN)with a 2-state conditional probability table(CPT).Moreover,a comprehensive reliability analysis method for communication devices and radio propagation is *** proposed methodology is verified by a reliability analysis of a real wireless communication network.

关键词： dynamic Bayesian network(DBN) wireless commu-nication network continuous time Bayesian network(CTBN) network reliability

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Research on Underwater Target Attitude Estimation Model Based on Multilayer Neural Networks

Research on Underwater Target Attitude Estimation Model Base...

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2025 IEEE Underwater technology, UT 2025

作者： Yang, Jikai Huazhong University Of Science And Technology School of Naval Architecture and Ocean Engineering Wuhan China

ISBN: (纸本)9798331534189

In marine operations and equipment deployment, the attitude measurement of underwater targets is a critical factor in ensuring precision and stability. However, traditional methods are constrained by limitations in real-time performance and adaptability in complex ocean environments, failing to meet the demands for high accuracy. To address these challenges, this study proposes a deep learning model based on multilayer neural networks for classifying and predicting the angles of underwater target attitudes. MATLAB simulations were used to generate sonar echo data for rigid ellipsoid targets, extracting frequency response features under varying aspect ratios and attitude angles to construct a high-quality training dataset. The model architecture comprises an input layer, multiple hidden layers, and classification and regression output layers, enabling simultaneous classification of aspect ratios and prediction of attitude angles. During training, the model's performance was optimized by adjusting hyperparameters such as the number of layers, neurons per layer, activation functions, and learning rates, significantly enhancing prediction accuracy and efficiency. Experimental results demonstrate that the model achieves 100% accuracy in classification tasks and minimal error in regression tasks, reflecting excellent generalization and robustness. This research provides an efficient and reliable technical solution for underwater target monitoring and attitude estimation in complex marine environments, laying a solid foundation for further studies in related fields. © 2025 IEEE.

关键词： MATLAB

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Power capture performance analysis of a 2DoF nonlinear wave energy converter in regular waves 9th

Power capture performance analysis of a 2DoF nonlinear wave ...

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9th International Conference on Marine Structures, MARSTRUCT 2023

作者： Gao, Yu Liu, Kun Gao, Zhen Guo Wang, Jiaxia Jiang, Wenan School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang China Jiangsu University Zhenjiang China

ISBN: (纸本)9781032506364

As a renewable energy source, wave energy has attracted wide attentions in recent years and differentwave energy converters (WECs) have been developed. To improve the energy absorption efficiency, thispaper explores a novel two-degree-of-freedom (2DoF) bistable WEC based on the 1DoF bistable power take off(PTO) system. The 2DoF bistable power capture system is realized by two symmetrically oblique main springs(responsible for bistable characteristics) and an auxiliary spring (responsible for adjusting the dynamic response ofthe floater). The auxiliary spring, which is attached to a mass block with an additional vertical motion DoF, makesit easy for capturing more wave energy of 2DoF bistable systems in the low and high frequency regions. Theeffects of the damping coefficient of PTO system, nonlinear parameter, the stiffness of main spring and auxiliaryspring on the power capture performance of the 2DoF bistable system are discussed based on the numericalresults. © 2023 The Author(s).

关键词： Wave energy conversion

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