Underwater construction 2025
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03 - Control of nonlinear offshore platforms using semi-active tuned mass damper inerter under combined wave and wind loads
Authors: Seyyed Ali Mousavi Gavgani, Seyed Hossein Hosseini Lavassani, Gebrail Bekdas This paper studies the Semi-Active Tuned Mass Damper Inerter (SATMDI) for reducing vibrations in offshore platforms responding to wind and wave loading. It uses an interval type-2 fuzzy logic controller (IT2FLC) optimized with an observer-teacher-learner-based optimization algorithm. Results show that SATMDI + IT2FLC can greatly reduce energy effects, preventing structural plasticity, with example reductions of 91% in inter-story drift and 83% in absolute acceleration for a 100-year loading scenario.
04 - A Comprehensive Study on Environmental Impacts of Offshore Platforms Abandonment and Decommissioning in Malaysia.
Authors: Nuraiesya Khanoon Thariq Khan, Nurfarah Farhana Nurisman, Asheeka Razali, Mohd Haris Abdul Rani PETRONAS plans to increase the abandonment and decommissioning of offshore platforms from 2024 to 2026. Malaysia's oil and gas sector, contributing about 20% to the GDP, requires eco-friendly methods to prevent environmental harm. The study reviews sustainable dismantling practices, balancing economic and ecological needs.
05 - Tether analysis and stability investigation of space rocket launch offshore compliant platform in regular seas.
Authors: Srinivasan Chandrasekaran, Ashish Unnikrishnan, and Adwait Panindre This study looks at the stability of a multi-utility offshore platform for rocket launches, focusing on tether dynamics and platform behavior. The platform, modeled in ANSYS AQWA, has buoyant legs and a topside linked by ball- and-socket joints, allowing motion while keeping rotations separate. The extended topside needs stability checks due to pitch moments. Free-decay tests show rigid heave and pitch motions (~3 s) and flexible surge motions (~150 s). Dynamic tether analysis in different sea states shows simultaneous tether failures significantly affect platform stability, causing major shifts in heave and pitch.
06 - Design of a Semi-Submersible floating platform for Floating Offshore Wind Turbine (FOWT) IEA 15-Megawatt
Authors: Zulqarnain Ali, Ahmad Hassan, Sascha Kosleck, Ghaith Esber This study proposes solutions for designing a semi- submersible platform for a 15-MW wind turbine, located 300 meters deep with a height of 165 meters above water. It uses structural steel and concrete for stability and examines the platform's dynamics while ignoring mooring effects. Structural analysis includes pitch and stability calculations. Advanced simulations assess heave responses and wave interactions, achieving a 20% reduction in dynamic response and 25% improvement in energy efficiency. The framework aids in marine engineering, and future work may include testing and machine learning for better design.
09 - Analysing the legal and regulatory framework for decommissioning offshore platforms: a comparison between brazil (br) and the united kingdom (uk).
Authors: Elesito Lelo-Mali Cairo de Deus, José Adolfo de Almeida Neto, Attawan Guerino Locatel Suela This article analyzes the legal aspects of the decommissioning process in the United Kingdom and Brazil through a systematic literature review. It examines norms related to offshore platform decommissioning in both countries, finding that they align their policies with international sustainability standards. However, implementation issues arise, especially in Brazil, due to conflicts of interest. The study suggests areas for future research to improve policy application and resolve these conflicts.
10 - The impact of platform motion on the aerodynamic characteristics of floating offshore wind turbine arrays.
Authors: Xiang Li, Qing Xiao, and Yang Huang Floating offshore wind turbines (FOWTs) are gaining attention. This paper examines how platform motion affects the aerodynamic features of a FOWT array using a high-fidelity numerical tool developed from OpenFOAM, a powerful, open-source software for computational fluid dynamics (CFD). Three turbine arrangements are simulated, showing significant wake interactions. The capacity factor varies by layout, while platform motion influences power fluctuations. A coupled model considering both pitch and surge motion is needed.
01 - Effects of Cover-Plate Geometry on the Mechanical Behavior of Steel Frame Joints with Middle-Flange and Wide-Flange H- Beams
Author: Osama Zaid Yahya Al-Ansi, Linfeng Lu, Saleem Mohammed Ali Ahmed AL-Saeedi and Bingyou Liu This study explores the mechanical behavior of cover-plate reinforced connections in steel frames, addressing gaps in current design standards. Results show that cover plates improve load-bearing capacity and ductility by relocating plastic hinges outward from joint regions. The study also recommends cover-plate thickness should be at least 0.3 times the beam height, ensuring the combined thickness does not exceed the column height. These findings provide practical guidelines for designing resilient steel frame connections in seismic regions.
08 - Bolted Flange Connection Leakage: a Systematic Review of Monitoring Challenges and Technologies
Authors: Ben Cloostermans, Dick Pronk, Björn Bruckenburg, Sidney Goossens, Tigran Baghdasaryan, Francis Berghmans This article reviews various techniques to enhance the safety, reliability, and environmental compliance of bolted flange connections in industrial systems. It emphasizes the importance of proper installation processes to achieve optimal gasket surface pressure for leakage prevention and highlights the need for robust monitoring systems. The article explores both traditional and advanced monitoring strategies, weighing their effectiveness in leak detection and highlighting innovative approaches for enhancing long-term monitoring.
11 - Gas Pipeline Leakage Risk Analysis Based on Dynamic Bayesian Network
Author: Zhenping Wang, Xiaoyun Gui, Weifeng Wang, Xuanchong Zhao, and Xiaohan Ji A dynamic Bayesian network analysis is proposed to address high uncertainty and leakage risk in gas production pipelines in high-sulfur fields. The model uses Bow-tie model analysis to summarize risk sources and accidents, and a temporal dimension to construct a dynamic Bayesian network model. The study reveals that flow, valve, and pipeline status are key factors in gas leakage accidents, and six risk sources, including medium corrosion, are identified.
12 - Experimental Study on Pipeline–Soil Interaction in Translational Landslide
Authors: Tianjun Xue, Lingxin Liu, Jianlei Zhang, Mengjie Dai, Gengyuan Shi, and Xinze Li This study investigates the interaction between pipelines and soil in translational landslide zones using large-scale indoor model tests. Results show that failure in translational landslides is characterized by initial sliding at the slope crest, driving lower soil mass, and resulting in global slope instability. Pipelines traversing slopes laterally enhance slope stability by providing anti-sliding resistance. The study offers insights for improving pipeline safety and reliability.
13 - Study of the mechanical properties of double line pipelines under silty sandstone and pipeline coupling.
Authors: Cun-dong Xu, Wen-hao Han, Jin-xi Xia, Jun-kun Nie, Jun Cao, & Zhi-hang Wang This study examines the impact of filling thickness and internal water pressure on the stability of a water supply pipeline. It uses a numerical simulation method to study the influence of different filling thicknesses and internal water pressures on the pipeline's mechanical properties. Results show that soil filling and single-layer filling thickness increase vertical displacement and tensile and compressive stresses.
15 - Horizontal Directional Drilling: A Solution to Oil and Gas Pipeline Vandalism and Theft in Nigeria
Authors: Ogunweolu Oluseyi Emmanuel This study explores the use of horizontal directional drilling (HDD) as a potential solution to combat oil pipeline vandalism in Nigeria. The research aims to analyze the advantages, challenges, and economic feasibility of HDD in Nigeria's oil and gas sector. The study will examine case studies and literature to assess the economic feasibility of HDD and compare it with traditional methods. The findings will contribute to the existing knowledge on combating oil and gas pipeline vandalism in Nigeria and encourage policymakers and stakeholders to consider HDD as a viable solution.
16 - Influence of ground load on adjacent oil and natural gas pipelines
Authors: Zhengwei Guo, and Yinchun Gong Ground building causes significant stress on buried pipelines, potentially destroying them if the stress exceeds the pipeline's yield strength. Research uses theoretical and numerical methods to analyze stress and deformation of pipelines. The study investigates the impact of distance between pipeline and ground building on stress and deformation, providing valuable insights for pipeline construction.
17 - Mathematical And Experimental Investigation Of Vibration Isolation Characteristics Of Negative Stiffness System For Pipeline
Authors: Sharif Md Yousuf Bhuiyan, Adar Chowdhury, Md Shahadat Hossain This document analyzes the impact of vibration on pipelines and their equipment, focusing on the development of a negative stiffness system. The study aims to reduce frequency and vibration in pipeline systems by adding a negative stiffness system to the main structure. This will help maintain safe and secure operations, ensuring the safety and efficiency of pipelines.
18 - Mechanical Response of Pipeline Leakage to Existing Tunnel Structures: Insights from Numerical Modeling
Authors: Ruichuan Zhao, Linghui Li, Xiaofei Chen, and Sulei Zhang This study investigates the mechanical response of existing tunnel structures to pipeline leakage under different layout conditions using numerical modeling. Results show that horizontal pipeline-tunnel distance does not influence leakage zone development but significantly alters seepage path length and interface contact area. This information is crucial for optimizing urban underground design and construction guidelines.
20 - Analysis of the Causes of Excessive Noise and Vibrations of Live Steam Pipelines
Authors: Damian Pietrusiak, Jerzy Czmochowski, Artur Górski, Artur Iluk, Przemysław Moczko, and Michał Paduchowicz This article investigates noise and vibration issues in a live steam pipeline using a scanning laser vibrometer and acoustic camera. A discrete model and FEM analysis identify noise sources and propose methods for eliminating harmful noise.
21 - Dynamic response behaviors of buried pipelines subjected to the impact of spherical falling objects in cold regions
Authors: Qiaozhen Li, Chao Wang, Peng Wang, Min Luo, Hao Wang, Ye Lu The study examines the dynamic response behavior of buried pipelines in cold regions, considering the nonlinearity of pipeline material, falling objects, and frozen soil. Results show that factors like diameter-to-thickness ratio, impact velocity, and soil water content significantly influence pipeline deformation and residual stress. Controlling these factors can improve pipeline resistance to external impact damage.
22 - Optimising ML Pipeline Execution via Smart Task Placement
Authors: Pedro Rodrigues, Julio Corona, Mário Antunes, and Rui L. Aguiar This paper introduces a modular and flexible placement system for Machine Learning Operations (MLOps) pipelines, which automatically allocates tasks to suitable machines, reducing execution and waiting times. The system outperforms baseline methods and the Kubernetes default scheduler, demonstrating potential for improved resource utilization and faster ML model development in heterogeneous environments.
23 - Vibration Control of Deepwater Offshore Platform Using Viscous Dampers Under Wind, Wave, and Earthquake
Authors: Kaien Jiang, Huiyang Li, Guoer Lv, Lizhong Wang, Lilin Wang, and Huafeng Yu This study explores the use of viscous dampers (VDs) to reduce the vibration of a deepwater offshore platform under wind, wave, and earthquake action. A finite element model was used, and the results showed that VDs diagonally placed at each structural level effectively suppress platform vibrations. Under seismic excitation, the system reduced maximum deck acceleration, velocity, displacement, and base shear force by 9.95%, 22.33%, 14%, and 31.08%, respectively.
24 - Research on High-Performance Underwater-Curing Polymer Composites for Offshore Oil Riser Pipes
Authors: Xuan Zhao, Jun Wan, Xuefeng Qv, Yajun Yu, and Huiyan Zhao This study developed an underwater-curing composite material for offshore oil and gas extraction riser pipes, addressing corrosion issues and poor adhesion. The material, based on a polyisobutylene and butyl rubber blend system, exhibits high peel strength, low water absorption, and stability across a wide temperature range. The innovative solvent-free two-component epoxy system achieves rapid surface drying and pull-off strength exceeding 3.5 MPa. The material's fundamental properties and operational performance were determined, extending the service life of the pipes.
25 - Symmetric and Asymmetric Semi-Metallic Gasket Cores and Their Effect on the Tightness Level of the Bolted Flange Joint
Authors: Przemysław Jaszak, and Rafał Grzejda This paper explores the impact of semi-metallic gasket core shapes on bolted hinge joints. Its authors found that asymmetric gaskets provide higher strain on the sealing graphite layer and have a more uniform strain distribution. Additionally, asymmetric gaskets reduce leakage rates by around 60% compared to symmetric ones. The main leakage path is through the porous graphite layer.
26 - Advanced resource operation of main natural gas pipeline using CFD modeling methods
Authors: G.G. Ismayilov, F.B. Ismayilova, A. Nagizadeh The oil and gas industry's future operation of pipelines is crucial, and periodic checks are necessary to diagnose their technical condition. This paper investigates residual operating resources and wall thickness using an OLYMPUS 27 MG Ultrasonic Thickness Gauge. The study calculates minimum allowable thicknesses based on internal pressure and operational loads, determining the possibility of safe operation. Both analytical methods and modern software were used for calculations, including a three-dimensional spatial model and strength and stability calculations.
27 - A Novel Quadrilateral-Shaped Vibration Isolation Platform and Its Application in the Offshore Floating Platform
Authors: Zhenbin Guo, Jing Bian, Liangyu Li, and Ning Su This study presents a quadrilateral-shaped vibration isolation platform (QVIP) for offshore wind platforms, combining negative stiffness elements and optimized damping for high-static-low-dynamic stiffness. The design offers improved stability and effective vibration control, overcoming traditional trade-offs between isolation and load-bearing capacity.
28 - Prediction of Failure Pressure of Sulfur-Corrosion-Defective Pipelines Based on GABP Neural Networks
Authors: Li Zhu, Yi Xia, Bin Jia, and Jingyang Ma This study explores the degradation and failure prediction of pipeline materials in sulfur-containing environments, focusing on X52 pipeline steel. Despite surface corrosion and reduced structural load-bearing capacity, X52 steel's intrinsic mechanical properties remained within standard ranges. A Johnson-Cook constitutive model and a genetic algorithm-optimized backpropagation neural network were developed to predict failure pressure and corrosion rate in acidic environments.
02 - Design and development of a low-cost, eco-friendly forklift for sustainable logistics management
Authors: Asif Jalal, Muhammad Farooq, Izza Anwer, Nasir Hayat, Adeel Munir, Imran Zahid, Noreen Sher Akbar, M. Hamza, M. Nouman, and Fahid Riaz This article discusses the development and evaluation of an automated robotic forklift prototype designed to reduce injuries and improve efficiency in material handling within warehouses. Current statistics highlight the significant number of injuries and fatalities associated with manual forklift operations, prompting the need for safer alternatives. The prototype features advanced mobility capabilities, a remote operating system, and robust structural integrity, demonstrating its potential as a cost-effective and eco-friendly solution for industrial applications.
07 - Sustainability assessment of different pipeline materials in freshwater supply systems
Authors: Imran Mir Chohan, Azlan Ahmad, Naraindas Bheel, Taoufik Najeh, and Abdulrazak H. Almaliki This article explores the environmental effects of different pipeline materials used in freshwater supply systems through a life cycle assessment (LCA) framework. Utilizing SimaPro software, the research evaluates four pipeline materials and identifies that steel has a notably higher environmental impact during the manufacturing phase compared to others. It also assesses the installation phase, revealing that plastic pipelines produce significant impacts during installation. A case study in Seri Iskandar demonstrates that using environmentally sustainable materials can substantially reduce various environmental impacts associated with pipeline manufacturing and materials.
14 - Calculation of steel corrosion rate of reinforced concrete slab based on rust expansion crack
Authors: Duo Wu, Ziyi Zou, Hao Wu, Weihong Wan, Shangchuan Zhao, Jian Cao This study develops a refined calculation model that enhances the understanding of how distributed reinforcement affects crack propagation in reinforced concrete. It aims to improve nondestructive corrosion assessment methods through both experimental and theoretical analyses. The research incorporates the relationship between crack width and corrosion rates, validated through comparisons with existing models, ultimately contributing to more reliable quantitative detection of reinforcement corrosion in concrete structures.
19 - Modeling of the dynamic response of a wearable composite for an underwater shock wave
Authors: Jiangrui Qian, Xuhua Yu, Wenwu Liu, Guoyang Huang, Xia Liu, Yukun Wen, Yiqun Fang, Jun Li, and Jiajun Xu The article discusses the destructive effects of underwater explosions and highlights the urgent need for research not just in engineering protective materials, but also in human protection materials. A new composite material, combining carbon fiber laminate, artificial cartilage foam (ACF), and Kevlar fabric, has been developed to reduce injuries from explosive impacts. A finite element model was created to analyze the composite’s effectiveness while considering various factors like plate thickness and core panel density, along with an equivalent human body representation.
29 - Fiber-Reinforced Polymer Laminates in Aviation and Structural Engineering: A Synthetic Comparison of Performance Requirements, Design Principles, and Defect Assessment Procedures
Authors: Joana Janeikaite, Ieva Misiunaite, and Viktor Gribniak The article explores the divergent approaches to fiber- reinforced polymer (FRP) laminates in aviation and structural engineering, highlighting the unique challenges of each domain. While aviation prioritizes certification and fatigue resistance, structural engineering focuses on durability and environmental impact. The review synthesizes information from 168 literature references to propose integrated modeling and inspection frameworks that aim to harmonize the precision found in aviation with the practical considerations of structural engineering for improved performance and reliability of FRP composites.
30 - Hydrodynamic Characteristic Around the Riprap Protection of Monopile Wind Power Foundation with Scour Pit During Scour
Authors: Tongshun Yu, Li Wang, Congbao Mei, and Xiaofeng Dong This article examines the role of riprap protection in offshore wind power foundations, particularly its impact on hydrodynamics during scour events. Through experimental data on the soil failure process and a numerical model simulating the interaction between currents, the study reveals that intact riprap increases flow velocity and horseshoe vortex range around the monopile while decreasing pressure. As riprap becomes scoured, water cross-section increases, leading to reduced velocities and altered vortex patterns, ultimately affecting the stability of the foundation.
31 - The Mechanism Underlying the Influence of Temperature on the Fracture Toughness of Dissimilar Steel Welded Joints in Nuclear Power Plants
Authors: Jiahua Liu, Aiquan Zheng, Lei Wang, Hongwu Xu, Feifei Ji, Liqun Guan, and Jiong Luo This study investigates the fracture toughness (JQ) of the isolation layer in dissimilar metal welded joints (DMWJs) of pressure vessels, specifically focusing on SA508-III- 309L/308L-316L joints. Using the J-integral method, the research evaluates the impact of temperature on unstable crack propagation by conducting tests at varying temperatures, revealing that the JQ decreases as temperature increases, with a maximum reduction of 31.8%. The study concludes that the structural characteristics of the isolation layer and the thermal expansion differences exacerbate crack initiation and propagation, ultimately compromising the toughness of the weld material.