Article
Engineering, Marine
Hao Ding, Bo Huang, Liang Cheng, Ke Li, Qingyang Ren
Summary: This study investigates the dynamic response and cable forces of a submerged floating tunnel (SFT) under wave and wave-current interactions. Experimental results show that wave height, current velocity, and ratio of wavelength to structure size are important factors affecting the dynamic response of SFT and cable forces. The multi-anchor cable arrangement used in the experiments distributes cable forces more effectively and reduces potential safety hazards caused by cable breakage.
Article
Engineering, Marine
Deokhee Won, Jihye Seo, Seungjun Kim
Summary: This study proposed a type of submerged floating tunnel with a dual section and investigated its hydrodynamic behavior using an analytical method. The finite element analysis technique was verified by comparison with previous hydraulic test results. The resistance characteristics under waves and currents were found to be very different according to the two proposed mooring methods.
Article
Multidisciplinary Sciences
Timothy P. McKenna, Hubert S. Stokowski, Vahid Ansari, Jatadhari Mishra, Marc Jankowski, Christopher J. Sarabalis, Jason F. Herrmann, Carsten Langrock, Martin M. Fejer, Amir H. Safavi-Naeini
Summary: In this study, the authors demonstrate a chip-scale device that can perform a comprehensive set of resonant second-order nonlinear processes, including optical parametric oscillation, with low threshold power and efficient frequency tuning ability. This research is of great importance for expanding the applications of photonics and enhancing the performance of quantum photonics platforms.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Ocean
Zhihao Ren, Bin Teng, Longfei Cong
Summary: A new method for accurate discrete directional spectra is proposed and a program for analyzing nonlinear wave forces on marine structures in multidirectional irregular seas is developed. The method is validated through comparison with frequency-domain results and is used to investigate second-order diffracted forces on truncated cylinders in various wave conditions, focusing on the effects of wave directionality, directional spreading, and spectral characteristics of mixed seas.
JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME
(2022)
Article
Physics, Multidisciplinary
Marco S. Kirsch, Yiqi Zhang, Mark Kremer, Lukas J. Maczewsky, Sergey K. Ivanov, Yaroslav V. Kartashov, Lluis Torner, Dieter Bauer, Alexander Szameit, Matthias Heinrich
Summary: Higher-order topological insulators represent a novel topological phase with boundary modes characterized by a unique co-dimension of at least two. Despite promising preliminary considerations, experimental research on these systems has been limited to linear evolution of topological states, with observation of the interplay between nonlinearity and dynamics of higher-order topological phases remaining elusive. However, experimental demonstration of nonlinear higher-order topological corner states and observation of soliton formation in such structures could pave the way for exploring topological properties of matter in the nonlinear regime and potentially lead to the development of compact devices harnessing the intriguing features of topology.
Review
Optics
Guoping Lin, Qinghai Song
Summary: The Kerr optical frequency comb, as a novel microcomb source, has been widely applied in various fields and requires resonator platforms with small mode volumes and high quality factors. This review focuses on recent progress in microcomb development, including interactions with Raman, Brillouin scattering, and second-order nonlinear processes, leading to Kerr frequency combs transferring to other spectral windows.
LASER & PHOTONICS REVIEWS
(2022)
Article
Engineering, Marine
Shihao Xue, Yong Xu, Guoji Xu, Jinsheng Wang, Qin Chen
Summary: This paper presents a novel submerged breakwater design for protecting coastal bridges and other infrastructure. Through numerical simulations, the new design is found to be more effective in dissipating wave energy and reducing wave loads compared to traditional designs.
Review
Chemistry, Inorganic & Nuclear
Yaoguo Shen, Wenyue Tang, Xiaoxin Lin
Summary: This review provides a comprehensive overview of NLO sulfates, including classification, synthesis methods, crystal structure features, optical performances, and structure-property relationships. The key structure-property relationships are summarized to assist new researchers in designing superior sulfate NLO materials.
COORDINATION CHEMISTRY REVIEWS
(2022)
Article
Engineering, Marine
Weiye Ding, Hongyue Sun, Xizeng Zhao, Congfang Ai
Summary: The impacts of cylinder extended length, rotation angle, and wave incidence angle on hydrodynamic characteristics were investigated using numerical simulation. The results showed that the OpenFOAM-based numerical model can effectively deal with the interaction between internal solitary waves and submerged cylinders. The distribution of forces, maximum dynamic pressure forces, and flow field around the submerged extended cylinder were analyzed to reveal the hydrodynamic characteristics.
Article
Chemistry, Multidisciplinary
Xiaocong Deng, Kai Wang, Qianqian Li, Zhen Li
Summary: This study proposes a new approach to design second-order nonlinear optical polymer networks through in situ thermal crosslinking. The networks exhibit excellent optical performance and stability after in situ poling and thermal crosslinking.
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Materials Science, Multidisciplinary
Yangkun Du, Peter Stewart, Nicholas A. Hill, Huabing Yin, Raimondo Penta, Jakub Kory, Xiaoyu Luo, Raymond Ogden
Summary: This paper investigates the application of the classical problem of indentation on an elastic substrate in the field of Atomic Force Microscopy. It highlights that linearly elastic models are insufficient for predicting force-displacement relationships at large indentation depths and suggests a nonlinear indentation model for hyperelastic materials. The authors propose a solution for second-order amplitude deformations and material nonlinearity using second-order elasticity theory, and derive analytical solutions using parabolic or quartic surfaces to mimic a spherical indenter. The results show good agreement with finite element simulations.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Environmental Sciences
Yanna Zheng, Yifan Zhou, Ruijia Jin, Yingna Mu, Ming He, Lingxiao Zhao
Summary: This study presents analytical solutions for analyzing wave dissipation and bottom flow characteristics of permeable submerged horizontal plates. The experimental results show that solid submerged plates effectively attenuate waves, with a greater effect at smaller depths. However, this attenuation effect becomes reduced after a certain threshold.
Article
Physics, Multidisciplinary
Karim Achouri, Andrei Kiselev, Olivier J. F. Martin
Summary: We present a frequency-domain modeling technique for second-order nonlinear metasurfaces, derived from the generalized sheet transition conditions (GSTCs). By extending the GSTCs to include effective nonlinear polarizations, the effective nonlinear susceptibilities of a given metasurface can be retrieved and its nonlinear scattering responses can be predicted under arbitrary illumination conditions. The proposed model can serve as a design platform for implementing complex nonlinear metasurface based applications.
NEW JOURNAL OF PHYSICS
(2022)
Article
Engineering, Ocean
P. X. Zou, N. Ruiter, W. S. J. Uijttewaal, X. X. Chen, D. J. Peters, J. D. Bricker
Summary: The effects of marine fouling on the hydrodynamic behavior of submerged floating tunnels (SFTs) were investigated in this research. The results showed that as roughness height and coverage ratio increased, the drag coefficient (Cd) generally increased while the inertia coefficient (Cm) decreased.
APPLIED OCEAN RESEARCH
(2023)
Article
Physics, Fluids & Plasmas
Iskander Abroug, Nizar Abcha
Summary: This paper investigates the influence of irregular random waves on the von Karman street in the wake of an elastically mounted cylinder. The shedding frequency decreases with increasing nonlinearity of the generated waves. The temporal evolution of the phase combination shows a synchronization-like effect when the phase is zero. This approach quantifies the temporal variability of synchronization in the presence of random irregular waves.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Computer Science, Artificial Intelligence
Z. H. Ding, M. Huang, Z. R. Lu
SWARM AND EVOLUTIONARY COMPUTATION
(2016)
Article
Mathematics, Applied
G. Liu, L. Wang, W. L. Luo, J. K. Liu, Z. R. Lu
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2019)
Article
Engineering, Mechanical
Zhong-Rong Lu, Junxian Zhou, Li Wang
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2019)
Article
Computer Science, Artificial Intelligence
Zhenghao Ding, Yilin Zhao, Zhongrong Lu
APPLIED SOFT COMPUTING
(2019)
Article
Engineering, Multidisciplinary
Zhong-Rong Lu, Dahao Yang, Jike Liu, Li Wang
APPLIED MATHEMATICAL MODELLING
(2020)
Article
Engineering, Multidisciplinary
Z. R. Lu, X. X. Lin, Y. M. Chen, M. Huang
APPLIED MATHEMATICAL MODELLING
(2017)
Article
Engineering, Marine
Chunhao Jiang, Lin Lin, Nian-Zhong Chen
Summary: A novel type of side structure for enhancing the crashworthiness of double-hull vessels is proposed based on auxetic materials. Numerical simulation demonstrates the resistance to collision of three different unit cells. A comparative study shows that the proposed side structures have superior energy absorption and collision resistance compared to traditional side structures.
Article
Engineering, Marine
Lihua Xu, Jiasong Wang, Michael S. Triantafyllou, Dixia Fan
Summary: This paper presents a data assimilation method based on the POD-DeepONet structure to fuse two types of fidelity data from vortex-induced vibration (VIV) problems. The POD-DeepONet structure provides better accuracy and more stable predictions for amplitude response, successfully capturing the changing trend with the oncoming flow speed. The exponentially fitted MSE formula allows for quick determination of the required case number under the expected error.
Article
Engineering, Marine
Ilias Gavriilidis, Aris G. Stamou, Christos Palagas, Efthimios Dourdounis, Nikos Voudouris, Athanasios Tazedakis, Spyros A. Karamanos
Summary: This study investigated the collapse resistance of thick-walled steel pipes fabricated with the JCO-E process for deep offshore applications. It conducted a comprehensive analysis using experimental, numerical, and analytical approaches to examine the effects of heat treatment on the collapse behavior of two JCO-E pipes. The results were compared with the predictions of the DNV-ST-F101 standard, and the fabrication factor afa was discussed. The study also explored the impact of yield strength recovery due to heat treatment on the collapse of pipes with different D/t ratios.
Article
Engineering, Marine
Sung-Jae Kim, Chungkuk Jin, MooHyun Kim
Summary: This study evaluates the effects of tsunami waves on the global performance of a spread-moored Floating Storage Unit (FSU) through tsunami-floater-mooring coupled dynamics simulations. The results show that larger tsunami heights and relatively short durations result in significantly increased motions and mooring tensions of the FSU.
Article
Engineering, Marine
Ling Zhu, Zhihui Zhou, Preben Terndrup Pedersen
Summary: Ship grounding experiments are crucial for validating numerical analysis and theoretical formulations. In this study, small-scale ship model grounding tests on a sharp rock were conducted in a water tank to observe and record different damage modes, ship bottom plate damage extents, and ship motion. The test results were used to analyze the energy dissipation process and the influence of initial conditions on ship response and damage.
Article
Engineering, Marine
Zhiping Zheng, Yanlin Shao, Jikang Chen
Summary: This study investigates the effect of horizontal low-frequency (LF) displacements and velocities on the responses of floating structures in irregular waves, focusing on a deep-draft spar buoy. The study finds that incorporating LF displacements and velocities in the seakeeping analysis is essential for reducing surge and pitch responses. The standard deviations of LF surge and pitch motions scale with significant wave height, highlighting viscous damping as the dominating damping mechanism.
Article
Engineering, Marine
Birendra Chaudhary, Hewenxuan Li, Akongnwi Nfor Ngwa, Helio Matos
Summary: This study investigates the long-term performance and effectiveness of coating systems for 3D-printed pressure vessels subjected to accelerated aging. The results show that the application of polyurethane coating systems significantly slows the degradation process, reducing critical operational depth and increasing pressure differential. This research contributes important insights into enhancing the longevity and performance of 3D-printed pressure vessels through coating systems.
Article
Engineering, Marine
Yuelin Song, Qin Dong, Jiping Zhang, Guoqiang Li, Dongfang Xu, Ping Yang
Summary: The objective of this research is to study the characteristics of low-cycle fatigue crack propagation from the perspective of accumulative plastic damage and propose a reliable prediction model for crack growth in EH-36 steel under high stress levels. Experimental findings demonstrate that increasing the mean stress and stress amplitude accelerates the progression of fatigue damage.
Article
Engineering, Marine
Hao Ding, Bo Huang, Liang Cheng, Ke Li, Qingyang Ren
Summary: This study investigates the dynamic response and cable forces of a submerged floating tunnel (SFT) under wave and wave-current interactions. Experimental results show that wave height, current velocity, and ratio of wavelength to structure size are important factors affecting the dynamic response of SFT and cable forces. The multi-anchor cable arrangement used in the experiments distributes cable forces more effectively and reduces potential safety hazards caused by cable breakage.
Article
Engineering, Marine
Baoshun Zhou, Zhixun Yang, Mostafa Amini-Afshar, Yanlin Shao, Harry B. Bingham
Summary: In the hydroelastic analysis of large floating structures, accurate prediction of response relies on the structural stiffness. However, obtaining exact structural stiffness is challenging due to the complexity of modern ship structures. This study proposes an efficient analysis technique that combines finite element and finite difference methods to calculate structural stiffness and solve hydrodynamic problems.
Article
Engineering, Marine
Xinwei Chen, Yang Yu, Lei Wang
Summary: This study introduces a framework to evaluate and compare scour prediction models, focusing on design robustness. By applying this framework, the study recommends the most favorable scour prediction model and optimal design for monopiles in OWTs.
Article
Engineering, Marine
Yu Lei, Wei Li, Xiang Yuan Zheng, Huadong Zheng, Shan Gao, Shengxiao Zhao
Summary: This paper compares the numerical results of a floating offshore wind turbine integrated with a steel fish farming cage (FOWT-SFFC) against experimental data. The study shows that the simulated responses are in good agreement with the experimental data and reveals the important influence of second-order wave forces on the simulation results.
Article
Engineering, Marine
Chenyu Luan, Torgeir Moan, Knut Andreas Kvale, Zhengshun Cheng
Summary: This paper deals with the study of the shear lag effect on the bending moment distribution in pontoon-type floating bridges. Comparative and parametric studies are carried out using beam and linear shell models to analyze the influence of shear lag on the bending stiffness and eigenmode shapes of the bridges. The study shows that elementary beam models may inaccurately predict the bending moments in bridges with large width and short span lengths, and a practical method is proposed to determine when caution is needed in using these models. The paper also highlights the complex boundary conditions near the bank abutment and the significant influence of shear lag on the bending moments in this region.
Article
Engineering, Marine
Akira Tatsumi, Yuji Kageyama
Summary: This study proposes a methodology to quantify the uncertainty of the ultimate strength of stiffened panels in steel ships and offshore structures due to the welding initial deflection. A statistical model of the initial deflection shape is developed based on measured data, and probability distributions of the ultimate strength are calculated using Monte Carlo simulation.
Article
Engineering, Marine
Zhenmian Li, Yang Yu, Xin Liu, Xiaowei Liu, Xiangyang Wang, Leige Xu, Jianxing Yu
Summary: This study evaluates the local collapses and propagating buckles of offshore pipelines under external overpressure, reverse fault displacements, and collapse failures. Different designs of integral arrestors are tested in a numerical model, and the effects of fault dip angles are investigated. The results show that integral arrestors are effective in preventing propagating buckles.