Article
Engineering, Marine
Donghan Woo, Jung Kwan Seo
Summary: This study validated the two-way fluid-structure interaction method for precisely predicting the non-linear structural response of H-beams to a propane burner fire and proposed the proper time increment for two-way FSI analysis.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Civil
Iziengbe Inerhunwa, Yong Wang, Meini Su
Summary: This paper presents a probabilistic analysis method to include the influences of fire service intervention in structural reliability analysis. Through an extensive parametric study and Analysis of Variance, it is shown that fire growth rate and compartment floor area are the most influential factors. The effects of fire load, steel critical temperature, and fire protection thickness are also observed.
FIRE SAFETY JOURNAL
(2021)
Article
Engineering, Marine
Shiyu Han, Peng Wang, Zhihui Jin, Xiaoyi An, Hui Xia
Summary: Compared to metal materials, fiber-reinforced composites have numerous advantages and can be tailored to meet specific needs by selecting suitable materials and arrangement. This paper analyzes the effects of laminate types on the performance of composite ducted propellers and proposes a parameter optimization method for designing them.
Article
Environmental Sciences
Jaume Ruscalleda-Alvarez, Hannah Cliff, Gareth Catt, Jarrad Holmes, Neil Burrows, Rachel Paltridge, Jeremy Russell-Smith, Andrew Schubert, Peter See, Sarah Legge
Summary: Indigenous Australians have historically used fire in spinifex deserts. Many indigenous groups today are trying to restore these practices to achieve social, economic, cultural, and biodiversity goals. However, measuring and reporting on the outcomes of fire management is challenging due to undefined fire patterns and variable rainfall in the desert. This article presents an approach to account for rainfall variability and assess the performance of fire management.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Civil
Christian Louter, Chiara Bedon, Marcin Kozlowski, Alain Nussbaumer
Summary: This paper investigates the structural response of laminated glass beams under combined fire-exposure and sustained in-plane loading through experimental testing and Finite Element (FE) numerical modelling. The experimental results show that laminated glass beams can withstand in-plane loading for a period of time, but the outcomes are influenced by boundary conditions. Further FE simulations demonstrate that increasing top zone protection prolongs failure time while increasing load shortens it.
FIRE SAFETY JOURNAL
(2021)
Article
Construction & Building Technology
Zhongnan Ye, Shu-Chien Hsu, Hsi-Hsien Wei
Summary: This study developed an FE-based machine learning framework for predicting structural displacement based on temperature data, with RF and GB models outperforming others in terms of predictive accuracy. The developed framework shows high potential for real-time structural response prediction during fire emergencies.
AUTOMATION IN CONSTRUCTION
(2022)
Article
Engineering, Manufacturing
Yanzhou Fu, Austin R. J. Downey, Lang Yuan, Hung-Tien Huang
Summary: This research develops a real-time product structural quality validation system using a multi-dimensional accumulation-threshold-based decision-making approach. The proposed system can effectively evaluate the impact of defects on the structural performance of a part and meet real-time constraints.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Mechanical
C. Mertens, A. Sciacchitano, B. W. van Oudheusden, J. Sodja
Summary: An experimental method is used to determine the structural motion and unsteady aerodynamic loads of a pitching airfoil model, utilizing a single measurement and data processing system, which simplifies the process compared to using multiple systems simultaneously. Flow field measurements are conducted using a robotic PIV system and Lagrangian particle tracking with helium-filled soap bubbles, while structural measurements are achieved through fiducial marker tracking on the model surface. The determination of unsteady aerodynamic loads is based on two approaches using potential flow and thin airfoil theory, resulting in efficient load determination on unsteady airfoils with good agreement to reference measurements.
JOURNAL OF FLUIDS AND STRUCTURES
(2021)
Article
Engineering, Marine
Shen -Haw Ju, Cheng-Han Hsieh
Summary: This study developed an optimization procedure using Powell's method, which can optimize parameters in structural designs. The results suggest that specific architecture design and braking systems can effectively minimize the structural weight.
Article
Engineering, Mechanical
Yibo Jiang, Shuiguang Tong, Zheming Tong, Sheng Li, Weihao Cheng
Summary: This paper proposes a new tribodynamic analysis method to evaluate the effects of time-variant loads on system responses. By using interval processes to describe uncertain time-variant loads and employing simplification and approximation methods, accuracy can be maintained while reducing computational costs.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Chemical
Xiaofeng Li, Guohua Chen, Faisal Khan, En Lai, Paul Amyotte
Summary: This study proposes a methodology to analyze the structural response of storage tanks to blast following a fire and establishes a numerical model to study the dynamic response process. The results show that the high temperature weakens the tank wall and allows it to absorb more energy from the blast wave.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2022)
Review
Engineering, Multidisciplinary
Mhd Anwar Orabi, Liming Jiang, Xinyan Huang, Asif Usmani
Summary: The utilization of composite floor systems in modern construction enables the efficient use of materials and labor for building large floor areas. Prior experiments have shown that composite floors can exhibit surprising robustness in high temperatures, but the collapse of World Trade Center towers demonstrated the opposite. In the past two decades, extensive experimental and theoretical studies have been conducted in this field. This review summarizes different approaches in studying composite floors and discusses design and analysis methods. It also identifies remaining challenges and provides recommendations for designing composite floor systems for fire.
Article
Engineering, Civil
Yao Sun, Kuangye Zhang, Guobin Gong
Summary: Fire safety is a significant concern for the design of aluminium alloy structures, as the high temperatures from fires can greatly decrease their load-carrying capacities. This paper investigates the residual material properties of structural aluminium alloys after fire exposure through experimental tests. The study analyzes the key post-fire material properties and proposes predictive models for accurately estimating the post-fire properties of structural aluminium alloys.
Article
Energy & Fuels
Kummara Venkata Guru Raghavendra, A. Lakshmi Prasanna, T. V. M. Sreekanth, Jonghoon Kim, Kisoo Yoo
Summary: Layered nanospheres of tungsten disulfide were synthesized for high-performance supercapacitors, showing excellent electrochemical properties and stability.
JOURNAL OF ENERGY STORAGE
(2021)
Review
Construction & Building Technology
Yanping Zhu, Husam Hussein, Aditya Kumar, Genda Chen
Summary: UHPC has higher strength and durability compared to NSC and HSC, but is prone to damage under high temperatures and fire conditions. Limited research and debates exist regarding the behavior of UHPC in such conditions, calling for exploration of new mechanisms to enhance its fire resistance.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Engineering, Marine
Sang Jin Kim, Jung Kwan Seo, Kuk Yeol Ma, Joo Shin Park
Summary: Collisions at sea can lead to serious injuries, property damage, and environmental harm, with offshore platforms at a higher risk due to their lack of avoidance capabilities. The increasing use of Wind-Turbine Installation Vessels (WTIVs) in response to green energy needs underscores the importance of considering their operational characteristics in collision risk assessments. This study develops a method for analysing WTIV collision frequency and compares it with existing methods, highlighting implications for ship-WTIV collision-frequency analysis.
SHIPS AND OFFSHORE STRUCTURES
(2021)
Article
Engineering, Marine
Sang Jin Kim, Mihkel Korgersaar, Nima Ahmadi, Ghalib Taimuri, Pentti Kujala, Spyros Hirdaris
Summary: This paper presents a procedure for simulating the influence of strongly coupled FSI effects on the dynamic response of ships in collision and grounding events, highlighting the importance of suitable FSI modeling in accident scenarios primarily due to the influence of hydrodynamic restoring forces. The method couples an explicit 6-DoF structural dynamic finite element scheme with a hydrodynamic method, accounting for various influencing factors.
Article
Engineering, Marine
Fabien Conti, Herve Le Sourne, Dracos Vassalos, Pentti Kujala, Daniel Lindroth, Sang Jin Kim, Spyros Hirdaris
Summary: The paper discusses a method to account for collision-based crashworthiness on ship damage distributions, showing that damage reduction can be quantified through statistical analysis and simulation of collision scenarios. It is demonstrated that adding a double hull or reinforcing the deck can reduce damage, with the conclusion that installing a double hull on vulnerable ship zones leads to increased A-index.
SHIPS AND OFFSHORE STRUCTURES
(2022)
Article
Engineering, Marine
Sang Jin Kim, Jung Min Sohn, Pentti Kujala, Spyros Hirdaris
Summary: The paper presents a unified FSI model for ship crashworthiness assessment following ship hard grounding, utilizing spring elements for hydrostatic restoring forces in 3 DoF and distributing added masses in 6 DoF at nodal points in way of contact. Comparison with a previous method shows excellent idealization of ship dynamics. The findings suggest that this method could be valuable for rapid evaluation of ship grounding scenarios and regulatory advancements.
JOURNAL OF MARINE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Marine
Sang Jin Kim, Ghalib Taimuri, Pentti Kujala, Fabien Conti, Herve Le Sourne, Jean-Philippe Pineau, Thibaut Looten, Hongseok Bae, M. P. Mujeeb-Ahmed, Dracos Vassalos, Levent Kaydihan, Spyros Hirdaris
Summary: The dynamic response of ships following grounding and collision accidents may be influenced by structural topology, operational and environmental conditions. Computational methods offer a useful alternative in accurately capturing crushing mechanisms with consideration of hydrodynamic influences. Simulations for typical accident scenarios confirm the importance of hydrodynamic restoring forces and the sensitivity of damaged area to the failure strain values in grounding scenarios.
Article
Materials Science, Multidisciplinary
Jeong Hwan Kim, Dae Kyeom Park, Tae Jin Kim, Jung Kwan Seo
Summary: As the depletion of hydrocarbon supplies continues, finding alternative energy sources with low emissions of harmful pollutants has become a growing concern. Hydrogen has been proposed as a fuel source for ships due to its ability to reduce pollution, low density, high engine performance, and high caloric value. However, working with liquid hydrogen requires very low temperatures, which necessitates a different design approach compared to normal fluid pipelines.
Article
Engineering, Marine
Soung Woo Park, Jeong Hwan Kim, Jung Kwan Seo
Summary: This study experimentally investigated the effect of tunnel length on explosion overpressure and analyzed and compared experimental data of hydrogen gas with that of hydrocarbon-based combustible gases. The findings can be used for designing ventilation holes and piping systems in ships, as well as developing new safety guidelines for hydrogen carriers and hydrogen-fueled ships.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Jung Min Sohn, Spyros Hirdaris, Jani Romanoff, Sang Jin Kim
Summary: This paper investigates the collapse behavior of submarine hulls under hydrostatic pressure loads and proposes a computational modeling approach. The accuracy of the numerical model is validated by comparing with experimental data. The effects of different material models and ply sequence parameters on collapse strength are examined, and the applicability of existing design codes is evaluated.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Mechanical
Ghalib Taimuri, Sang Jin Kim, Tommi Mikkola, Spyros Hirdaris
Summary: The assessment of structural crashworthiness following ship grounding events should consider the influence of multi-physics on dynamic response. This paper presents a rapid six degree of freedom (6-DoF) two-way coupled fluid-structure interaction (FSI) model that could be used for the rapid evaluation of ship dynamic response and structural crashworthiness during hard grounding events. The model is numerically validated and shown to be effective.
JOURNAL OF FLUIDS AND STRUCTURES
(2022)
Article
Engineering, Marine
Jeong Hwan Kim, Seon Jin Kim, Dae Yu Baeg, Hyun Ho Lee, Jung Kwan Seo, Jeom Kee Paik
Summary: This paper presents a method for assessing and managing fire risks on the flight deck of aircraft carriers. Realistic fire scenarios are selected and taken into account operational and ocean environmental conditions to establish fire exceedance diagrams associated with fire-impacted areas.
SHIPS AND OFFSHORE STRUCTURES
(2023)
Article
Engineering, Marine
Myung Su Yi, Jun Seok Park, Jung Kwan Seo
Summary: The manufacturing process of ships and offshore structures involves multiple stages, with accuracy and quality control being crucial. A new FE analysis method has been developed to predict welding-induced thermal deformation of large blocks, increasing analysis accuracy and reducing pre-processing time.
Editorial Material
Engineering, Marine
Sang Jin Kim
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Mechanics
Haris Nubli, Jung Min Sohn, Sangjin Kim
Summary: This study optimizes the cryogenic spill protection in the bunkering process of LNG-fueled ships using finite element (FE) analysis combined with computational fluid dynamics (CFD) modeling. A machine learning method, particularly decision tree learning and random forest techniques, is employed to accurately determine the temperature load profile and provide an effective platform for transferring the load profile.
CURVED AND LAYERED STRUCTURES
(2023)
Article
Engineering, Marine
Yeon Ho Kim, Joo Shin Park, Dong Hun Lee, Jung Kwan Seo
Summary: Aluminum outfitting is widely used in offshore platforms due to its corrosion resistance and light weight. However, confusion arises for designers due to the existence of various standards for handrail design and differing criteria among suppliers. This study reviewed and analyzed all codes and standards, and proposed 50 handrail design load scenarios through deterministic and probabilistic approaches. The proposed new handrail design load selection scenario is expected to improve safety by clarifying the purpose of the handrails, with acceptance criteria suggesting consideration of handrail use frequency and offshore platform design life to prevent excessive design. Through applying loading scenarios suitable for the project environment, this study aims to prevent trial and error in handrail design while maintaining overall worker safety.
INTERNATIONAL JOURNAL OF NAVAL ARCHITECTURE AND OCEAN ENGINEERING
(2021)
Article
Engineering, Marine
Dae Kyeom Park, Jeong Hwan Kim, Jun Seok Park, Yeon Chul Ha, Jung Kwan Seo
Summary: This study investigated the use of mineral wool as a structural material in passive fire protection systems on offshore installations, confirming its contribution to the structural behavior. It emphasizes the importance of considering the structural strength of insulation material in PFP systems during the structural design phase for offshore installations.
INTERNATIONAL JOURNAL OF NAVAL ARCHITECTURE AND OCEAN ENGINEERING
(2021)
Article
Engineering, Marine
Alba Ricondo, Laura Cagigal, Beatriz Perez-Diaz, Fernando J. Mendez
Summary: This research presents a site-specific metamodel based on the SWASH numerical model simulations, which can predict coastal hydrodynamic variables in a fast and efficient manner. The metamodel uses downscaled and dimensionality reduced synthetic database to accurately reproduce wave setup, wave heights associated with different frequency bands, and wave runup. This method has great potential in coastal risk assessments, early warning systems, and climate change projections.
Article
Engineering, Marine
Xiao Yu, Wangjun Ren, Bukui Zhou, Li Chen, Xiangyun Xu, Genmao Ren
Summary: This study investigated and compared the compression responses and energy absorption capacities of coral sand and silica sand at a strain rate of approximately 1000 s-1. The results showed that coral sand had significantly higher energy absorption capacity than silica sand due to its higher compressibility. The study findings suggest that using poorly graded coral sand can improve its energy absorption capacity.
Article
Engineering, Marine
Jingxi Zhang, Junmin Mou, Linying Chen, Pengfei Chen, Mengxia Li
Summary: This paper proposes a cooperative control scheme for ship formation tracking based on Model Predictive Control. A predictive observer is designed to estimate the current motion states of the leader ship using delayed motion information. Comparative simulations demonstrate the effectiveness and robustness of the proposed controller.
Article
Engineering, Marine
Yu Yao, Danni Zhong, Qijia Shi, Ji Wu, Jiangxia Li
Summary: This study proposes a 2DH numerical model based on Boussinesq equations to investigate the impact of dredging reef-flat sand on wave characteristics and wave-driven current. The model is verified through wave flume experiments and wave basin experiments, and the influences of incident wave conditions and pit morphological features on wave characteristics are examined.
Article
Engineering, Marine
Jayanta Shounda, Krishnendu Barman, Koustuv Debnath
Summary: This study investigates the double-average turbulence characteristics of combined wave-current flow over a rough bed with different spacing arrangements. The results show that a spacing ratio of p/r=4 offers the highest resistance to the flow, and the double-average Reynolds stress decreases throughout the flow depth. The advection of momentum-flux of normal stress shows an increase at the outer layer and a decrease near the bed region after wave imposition. Maximum turbulence kinetic energy production and diffusion occur at different layers. The turbulence structure is strongly anisotropic at the bottom region and near the outer layer, with a decrease in anisotropy observed with an increase in roughness spacing.
Article
Engineering, Marine
Meng Zhang, Lianghui Sun, Yaoguo Xie
Summary: The research proposes a method for online identification of wave bending and torsional moment in hull structures. For structures without large openings, the method optimizes sensor positions and establishes a mathematical model to improve accuracy. For structures with large openings, a joint dual-section monitoring method is proposed to simultaneously identify bending and torsional moments in multiple key cross sections.
Article
Engineering, Marine
Longming Chen, Shutao Li, Yeqing Chen, Dong Guo, Wanli Wei, Qiushi Yan
Summary: This study investigated the dynamic response characteristics and damage modes of pile wharves subjected to underwater explosions. The results showed that the main damaged components of the pile wharf were the piles, and inclined piles had a higher probability of moderate or more significant damage compared to vertical piles. The study also suggested that replacing inclined piles with alternative optimized structures benefits the blast resistance of pile wharves.
Article
Engineering, Marine
I. -C Kim, G. Ducrozet, V. Leroy, F. Bonnefoy, Y. Perignon, S. Bourguignon
Summary: Previous research focused on the accuracy and efficiency of short-term wave fields in specific prediction zones, while we developed algorithms for continuous wave prediction based on the practical prediction zone and discussed important time factors and strategies to reduce computational costs.
Article
Engineering, Marine
Hang Xie, Xianglin Dai, Fang Liu, Xinyu Liu
Summary: This study investigates the load characteristics of a three-dimensional stern model with pitch angle through a drop test, and reveals complex characteristics of pressure distribution near the stern shaft. The study also shows that the vibration characteristics of the load are influenced by the drop height and pitch angle, with the drop height having a greater effect on the high-frequency components.
Article
Engineering, Marine
Hangyuan Zhang, Wanli Yang, Dewen Liu, Xiaokun Geng, Wangyu Dai, Yuzhi Zhang
Summary: The deep-water bridge is more vulnerable to earthquake damage than the bridge standing in air. The larger blocking ratio has a significant impact on the added mass coefficient, which requires further comprehensive study. The generation mechanism of block effect is analyzed using numerical simulation software ANSYS Fluent. The results show that the recirculation zone with focus reduces the pressure on the back surface of the cylinder, resulting in the peak value of in-line force not occurring synchronously with the peak value of acceleration. The change in position and intensity of the recirculation zone with focus, as well as the change in water flow around the cylinder surface, are identified as the generation mechanism of the block effect, which has a 10% influence on the hydrodynamic force. The changing rule of the added mass coefficient with blocking ratio is discussed in detail, and a modification approach to the current added mass coefficient calculation method is suggested. Physical experiments are conducted to validate the modification approach, and the results show that it is accurate and can be used in further study and real practice.
Article
Engineering, Marine
Golnesa Karimi-Zindashti, Ozgur Kurc
Summary: This study examines the performance of an in-house code utilizing a deterministic vortex method on the rotation of circular and square cylinders. The results show that rotational motion reduces drag forces, suppresses fluctuating forces, and increases lift forces. The code accurately predicts vortex shedding suppression and identifies the emergence of near-field wakes in the flow over rotating square cylinders.
Article
Engineering, Marine
George Dafermos, George Zaraphonitis
Summary: The survivability of damaged ships is of great importance and the regulatory framework is constantly updated. The introduction of the probabilistic damage stability framework has rationalized the assessment procedure. Flooding simulation tools can be used to investigate the dynamic response of damaged ships.
Article
Engineering, Marine
Xuyue Chen, Xu Du, Chengkai Weng, Jin Yang, Deli Gao, Dongyu Su, Gan Wang
Summary: This paper proposes a real-time drilling parameters optimization method for offshore large-scale cluster extended reach drilling based on intelligent optimization algorithm and machine learning. By establishing a ROP model with long short-term memory neurons, and combining genetic algorithm, differential evolution algorithm, and particle swarm algorithm, the method achieves real-time optimization of drilling parameters and significantly improves the ROP.
Article
Engineering, Marine
Sung-Jae Kim, Chungkuk Jin, MooHyun Kim
Summary: This study investigates the dynamic behavior of a moored submerged floating tunnel (SFT) under tsunami-like waves through numerical simulations and sensitivity tests. The results show that design parameters significantly affect the dynamics of the SFT system and mooring tensions, with shorter-duration and higher-elevation tsunamis having a greater impact.
Article
Engineering, Marine
G. Clarindo, C. Guedes Soares
Summary: Environmental contours are constructed using the Inverse-First Order Reliability Method based on return periods. The paper proposes the use of the Burr distribution to model the marginal distribution of long-term significant wave heights. The newly implemented scheme results in different environmental contours compared to the reference approach.
