Review
Engineering, Ocean
Chiemela Victor Amaechi, Ahmed Reda, Mohamed A. Shahin, Ibrahim A. Sultan, Salmia Binti Beddu, Idris Ahmed Ja'e
Summary: The use of marine risers in deep seas has increased due to drilling explorations shifting towards deeper waters and the need for longer risers for sea-crossing infrastructure. Composite materials can provide lightweight, fatigue-resistant, corrosion-resistant, low-bending stiffness, and high-strength characteristics in marine riser engineering. This paper reviews the history and potential of composite marine risers, including the first successful deployment in 1995, and discusses their advancements and recommendations in deep waters.
APPLIED OCEAN RESEARCH
(2023)
Article
Engineering, Marine
E. P. Bilalis, M. S. Keramidis, N. G. Tsouvalis
Summary: Composite materials drive shafts with high strength, light weight, and high fatigue and corrosion resistance are suitable for high specification mechanical and marine applications. This study combines advanced finite element models and optimization algorithms to determine the optimal lay-up of a composite shaft and investigates the performance of the combined system with metallic flanges. The created models facilitate the structural design optimization of composite material drive shafts and lay the foundation for the future implementation of simulation-driven digital twins of composite materials drivetrain systems.
Article
Computer Science, Interdisciplinary Applications
Spyridon Kilimtzidis, Vassilis Kostopoulos
Summary: Novel high-aspect ratio airframe designs contribute to a more sustainable aviation future by enhancing aerodynamic efficiency and reducing drag. However, the design and optimization of these airframes are challenging due to issues like geometric nonlinearities and aeroelastic couplings. Combining low and high-fidelity tools in a cost-effective manner can lead to optimal configurations with reduced computational costs and improved performance.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Engineering, Aerospace
Angelos Kafkas, Spyridon Kilimtzidis, Athanasios Kotzakolios, Vassilis Kostopoulos, George Lampeas
Summary: Efficient optimization is crucial in realizing the full potential of an aeronautical structure, with success depending on capturing all relevant physics and computational efficiency. A multi-fidelity optimization framework was developed in this research to combine low-fidelity modules for initial design optimization and high-fidelity modules to explore further performance gains.
Article
Engineering, Civil
Srinivasan Chandrasekaran, S. Hari, Murugaiyan Amirthalingam
Summary: This research investigates the use of functionally graded material for marine riser applications, comparing its mechanical properties and durability with conventional carbon manganese steel. The results show that the functionally graded material exhibits higher strength and better high-temperature performance, making it suitable for marine environments.
Article
Chemistry, Physical
Johanna Xu, Zeyang Geng, Marcus Johansen, David Carlstedt, Shanghong Duan, Torbjorn Thiringer, Fang Liu, Leif E. Asp
Summary: Multifunctional materials offer lightweight and slender structural solutions for various applications. Using construction materials that can act as batteries and store electrical energy can contribute to highly energy efficient vehicles and aircraft in transportation.
Article
Mechanics
Spyridon Kilimtzidis, Athanasios Kotzakolios, Vassilis Kostopoulos
Summary: A new optimization framework is proposed to optimize the composite materials aircraft wings based on low-cost numerical tools for stiffness, strength, and dynamic aeroelastic constraints. The developed framework successfully guides the mass of the wing to a minimum while satisfying the constraints under a critical loading scenario. The presented optimization framework exhibits high accuracy and efficiency, providing a robust numerical tool for the early design stages of composite aircraft wings.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Hollis Smith, Julian A. Norato
Summary: A novel topology optimization method has been proposed for designing structures made of orthotropic, fiber-reinforced bars to maximize stiffness. The method extends geometry projection to use cylindrical bars reinforced with continuous fibers and ensures optimal material selection at intersection of bars. Numerical examples demonstrate the efficacy of the method in stiffness-based design of frame structures in 2D and 3D.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Engineering, Mechanical
Dan Wang, Zhifeng Hao, Ekaterina Pavlovskaia, Marian Wiercigroch
Summary: A low-dimensional model is proposed to study a top-tensioned riser under excitations from vortices and time-varying tension. The system is described by governing partial differential equations and multi-mode approximations are obtained using the Galerkin projection method. The study investigates different resonances and bifurcations under varying parameters, providing insights on system stability and behavior.
NONLINEAR DYNAMICS
(2021)
Article
Chemistry, Multidisciplinary
Zhiqiang Zhuang, Zhihui Qian, Xu Wang, Xiaolin Xu, Boya Chen, Guangsheng Song, Xiangyu Liu, Lei Ren, Luquan Ren
Summary: An integrated bionic strategy is proposed to develop a bioinspired structural composite material with highly efficient cushioning performance. The integrated bionic material, an S-spider web-foam, achieves unprecedented cushioning performance by reducing peak impact forces by a factor of 3.5 times better than silicone foam. These results deepen the understanding of flexible cushioning materials and provide new strategies and inspiration for the preparation of high-performance flexible cushioning materials.
Article
Engineering, Multidisciplinary
Hollis Smith, Julian Norato
Summary: This work presents a topology optimization method for designing fiber reinforcement and spatial layout of rectangular laminated plates in a three-dimensional design region. The method uses geometry projection techniques for efficient analysis with a non-conforming mesh. The laminates are assumed to be homogeneous in thickness and a discrete set of fiber orientations is considered. The optimization involves finding the optimal volume fraction of each fiber orientation in each laminate. Numerical examples demonstrate the effectiveness of the method in improving the performance of the laminates through layup and spatial layout optimization.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Chemistry, Applied
Vasudev S. Wagh, Madhukar S. Said, Jagadish S. Bennale, Syed G. Dastager
Summary: In this study, a cost-effective and robust production optimization of levan-like exopolysaccharide from marine Bacillus sp. SGD-03 using a Microbioreactor was analyzed. The produced EPS was shown to have a molecular weight of 1.0 x 10(4) Da and a branching pattern of beta-(2,6) linkages, similar to available levan-like polymers. The maximum yield of crude levan obtained was 123.9 g/L using the BioLector Pro Microbioreactor.
CARBOHYDRATE POLYMERS
(2022)
Article
Engineering, Marine
R. Pacheco, D. Di Capua, J. Garcia, O. Casals
Summary: This paper describes the development of a thermo-mechanical framework to analyze composite structures under fire loads within the scope of the H2020 project FIBRE4YARD. The framework uses adiabatic temperature to determine the temperature distribution of the triangular shell element, allowing for predictions of phenomena such as pyrolysis, thermo-mechanical yielding, and non-linear buckling. An application case involving a load-bearing section of a container ship is presented to validate the methodology using both traditional materials like steel and advanced materials like fiber reinforced plastic (FRP) composites.
Article
Chemistry, Physical
L. V. Udod, S. S. Aplesnin, M. N. Sitnikov, E. V. Eremin, M. S. Molokeev, A. V. Shabanov, O. B. Romanova, A. M. Kharkov
Summary: A Bi2Fe4O9/BiFeO3 composite with a ratio of 67/33 has been synthesized and characterized. The average crystallite sizes for each phase were determined, and the magnetization hysteresis and disappearance temperature were established. The magnetic phase transitions of each phase were determined using infrared absorption spectra, and the correlation between the composite's structure and magnetic properties was studied.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Multidisciplinary
Mingqiang Xu, Wenkai Wu, Shuqing Wang, Yufeng Jiang, Francis T. K. Au
Summary: This article proposes a cointegration-based method for localizing structural damage in deepsea mining risers subjected to random excitations. By applying multivariate time series analysis, the method can obtain stationary cointegrating residuals that are purged of the influence of nonstationary excitations. The results demonstrate the effectiveness of this method in accurately identifying the damage location.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Engineering, Civil
Leandro S. Moreira, Joao Batista M. Sousa, Evandro Parente
ENGINEERING STRUCTURES
(2018)
Article
Engineering, Civil
Marcelo Silva Medeiros, Evandro Parente, Antonio Macario Cartaxo de Melo
LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES
(2019)
Article
Construction & Building Technology
Joao Batista M. Sousa, Evandro Parente, Esio M. F. Lima, Michelle V. X. Oliveira
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2019)
Article
Engineering, Civil
Jamires Sousa Cordeiro Praciano, Pedro Sanderson Bastos Barros, Elias Saraiva Barroso, Evandro Parente Junior, Aurea Silva de Holana, Joao Batista M. Sousa Junior
THIN-WALLED STRUCTURES
(2019)
Article
Engineering, Civil
Luiz Antonio Taumaturgo Mororo, Antonio Macario Cartaxo de Melo, Evandro Parente Junior, Eliseu Lucena Neto, Francisco Alex Correia Monteiro
THIN-WALLED STRUCTURES
(2020)
Article
Computer Science, Interdisciplinary Applications
Marina Alves Maia, Evandro Parente Jr, Antonio Macario Cartaxo de Melo
Summary: This work proposes an efficient methodology for the optimum design of functionally graded structures using a Kriging-based approach combined with a hybrid PSO algorithm. The surrogate model replaces high-fidelity structural responses and design variables are related to volume fraction distribution and thickness. Results demonstrate significant reduction in computational effort compared to conventional approaches.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Article
Computer Science, Interdisciplinary Applications
Elias Saraiva Barroso, John Andrew Evans, Joaquim Bento Cavalcante-Neto, Creto Augusto Vidal, Parente Evandro Jr
Summary: Isogeometric analysis is a numerical method that integrates geometric modeling and numerical analysis, using the same geometric representation for both components. In cases where the geometric representation in a CAD system cannot be directly used for numerical simulation, an interior parametrization is necessary before performing isogeometric analysis.
ENGINEERING WITH COMPUTERS
(2022)
Article
Engineering, Marine
Leonardo G. Ribeiro, Beatriz M. Meneses, Jonas Aguiar, Evandro Parente, A. Macario C. de Melo, Fabio P. S. Mineiro, Mariana T. C. G. Carneseca
Summary: This study investigates the behavior of marine risers after rupture, discussing the dynamic buckling phenomenon and assessing the influence of key parameters on riser dynamics. Results show the importance of hysteretic nonlinear bending stiffness on falling riser dynamics, and statistical analysis using random waves assists in determining safe regions around the riser to prevent impact with other submarine elements. The proposed methodology provides valuable insights for damage mitigation in future riser designs.
Article
Computer Science, Interdisciplinary Applications
Elias Saraiva Barroso, Leonardo Goncalves Ribeiro, Marina Alves Maia, Iuri Barcelos Carneiro Montenegro da Rocha, Evandro Parente, Antonio Macario Cartaxo de Melo
Summary: This paper introduces BIOS, an object-oriented framework for heuristic optimization, with a focus on Surrogate-Based Optimization (SBO) and structural problems. SBO has gained popularity in structural optimization due to its high efficiency and little loss in accuracy, especially when adaptive sampling techniques are used. However, there are still many challenges to be addressed before SBO can be reliably employed in most optimization problems. The framework is designed to support experimentation, testing, and comparison, and it implements both nature-inspired algorithms and Sequential Approximated Optimization (SAO). The system aims to be efficient, easy to use, and extensible, and it has shown excellent results in benchmark tests and the optimization of functionally graded structures.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2022)
Article
Computer Science, Interdisciplinary Applications
Leonardo Goncalves Ribeiro, Evandro Parente Jr, Antonio Macario Cartaxo de Melo
Summary: Surrogate-Based Optimization has gained attention for its ability to optimize expensive problems with few individual evaluations. Multi-fidelity models improve accuracy by using lower and higher fidelity sources. However, there is a lack of robust techniques for determining the optimal location and fidelity of new data points in adaptive sampling Surrogate-Based Optimization. Additionally, the handling of constrained problems in Surrogate-Based Optimization with multi-fidelity models is not well-explored. This work proposes two alternative variable-fidelity acquisition functions and extends constraint-handling methods to the multi-fidelity model-based optimization.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Engineering, Mechanical
Renan M. Barros, Evandro Parente Jr, Marcelo S. Medeiros Jr
Summary: The objective of this study is to assess the influence of micromechanical homogenization schemes on the critical buckling load of functionally graded plates. The numerical findings show that micromechanical models and kinematic theories have a considerable effect on the critical buckling load of functionally graded plates, in addition to slenderness, gradation, and materials properties。
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Engineering, Marine
Beatriz Matos Meneses, Leonardo Goncalves Ribeiro, Evandro Parente Jr, Antonio Macario Cartaxo de Melo, Fabio Pompeo da Silva Mineiro, Mariana Teixeira Coelho Gomes Carneseca
Summary: This paper deals with the modeling and analysis of flexible lazy-wave risers after failure to understand their behavior and prevent damage to neighboring equipment and structures caused by falling risers. The study evaluates the effects of various parameters and presents a methodology to define a safe zone. The results indicate that the longitudinal drag coefficient and riser slenderness significantly influence the physical response, and the use of a nonlinear moment-curvature relationship and consideration of currents in different directions are important for determining the safe zone accurately.
Article
Mechanics
Leonardo Goncalves Ribeiro, Marina Alves Maia, Evandro Parente Jr, Antonio Macario Cartaxo de Melo
COMPOSITE STRUCTURES
(2020)
Article
Computer Science, Software Engineering
Marcelo S. Medeiros, Evandro Parente
Proceedings Paper
Materials Science, Multidisciplinary
S. P. Auad, J. S. C. Praciano, E. S. Barroso, J. B. M. Sousa, E. Parente Junior
MATERIALS TODAY-PROCEEDINGS
(2019)
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.
