Underwater construction 2024 to now
Back to the menu BUTTON TEXT Previous page 02 - Additive Manufacturing in Underwater Applications
Authors: Kinga Korniejenko, Szymon G ˛adek, Piotr Dynowski, Doan Hung Tran, Magdalena Rudziewicz, Sebastian Pose, and Thomas Grab Additive manufacturing, or 3D printing, as it is more commonly known, is emerging as a game-changer in various fields, including automated construction in challenging environments such as underwater. However, it is not perfect, despite having been tested in these environments. This study explores the advancements of 3D printing for underwater applications and identifies areas for refinement and enhancement, including technology and materials.
03 - Damage Characteristics and Dynamic Response of RC Shells Subjected to Underwater Shock Wave
Authors: Fantong Lin, Xianxiang Zhou, Jian Zhao, Lan Xiao, Lubo Tang, Ziye Liu, and Jianshuai Wang The authors used 3D models to study how underwater explosions affect shell structures at the bottom of the ocean. They looked at different shapes of these structures, like half-spheres and half-cylinders made of reinforced concrete. Using special software, they tested various factors like the type of explosion, distance, and water pressure. They found that these structures are damaged more when hit by shock waves in water than in air.
04 - The Speed Prediction Research of Peak Particle Vibration Velocity in Underwater Blasting Based on GWO-SVR
Authors: untao Sun, Jingzhu Huang, Zhiwei He, Jiahe Wang, Dawei Zhan, Qingxiong Zhu The study addresses the issue of blasting vibration generated during underwater engineering, which can cause significant damage to the surrounding environment. It shows that predicting the blasting peak particle velocity (PPV), which represents the maximum velocity of ground vibration caused by the detonation of explosives during blasting, can be utilized to mitigate these adverse effects.
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14 - Exploring the Potential of Reinforcement Learning in Pipe Spool Scheduling in Industrial Projects
Authors: Mohamed ElMenshawy, Lingzi Wu, Brian Gue, and Simaan AbouRizk This research project aimed to automate the pipe spool fabrication scheduling process for industrial projects. It explains the challenges involved in the current manual scheduling process and proposes the development of a reinforcement learning model to handle these tasks more efficiently. The ultimate goal is to minimize manual intervention and improve fabrication shops' scheduling processes.
01 - Experimental Investigation of the Evolution Process of Suspended Pipelines through River Bottoms under Unsteady Flow Conditions
Authors: Changjing Fu, Yangming Xu, and Tianlong Zhao This document explains the risks and mechanisms associated with water-induced disasters affecting long- distance oil and gas pipelines, particularly those crossing river channels. It discusses the findings from a flume model test that investigates the impact of unsteady flow conditions on riverbed evolution and pipeline suspension during floods.
13 - Concept Design of a 15 MW TLP-Type Floating Wind Platform for Korean Offshore Installation
Authors: Sung Youn Boo, Yoon-Jin Ha, Steffen Allan Shelley, Ji- Yong Park, Chang-Hyuck Lim, and Kyong-Hwan Kim This document describes a study focused on developing and validating a new Tension Leg Platform (TLP) floating wind platform with a 15 MW turbine for offshore wind farms in Korea. The study aims to ensure the platform's feasibility and resilience under extreme typhoon conditions and to minimize pre-service costs and risks by designing a wet-towable platform. The study also outlines the design process, analysis, and validation against industry standards to confirm compliance with design requirements for the planned site.
15 - RAP-MAC: A Robust and Adaptive Pipeline MAC Protocol for Underwater Acoustic String Networks
Authors: Xiaohe Pan, Mengzhuo Liu, Jifeng Zhu, Lipeng Huo, Zheng Peng, Jun Liu, and Jun-Hong Cui This document discusses the development and evaluation of a new protocol, the Robust and Adaptive Pipeline Medium Access Control (RAP-MAC), for underwater acoustic networks. It highlights the protocol's features, such as its adaptability, efficiency, and robustness, and shares the results of simulations and sea trials that demonstrate its effectiveness in enhancing communication in underwater environments.
18 - Ultra-Narrow Gap Welding Process Experiment of Underwater Cast Steel Pipeline
Authors: Xiaotong Han, Liang Zhu, Xiaoxia Jiang, Wei Han Khor, Hooi Siang Kang This paper explains a new welding method, the flux band-constrained arc ultra-narrow gap welding (UNGW), for improving the quality of welded joints in underwater cast steel pipelines. It highlights the advantages of UNGW over traditional welding methods, describes the experimental study conducted to optimize welding parameters, and analyzes the microstructural and mechanical properties of the welds. It also suggests potential welding process improvements by manipulating the flux band composition.
25 - Exploring the effects of ambient conditions on the cryogenic cooling times of offshore structures: Towards optimising sustainability and the decommissioning timescale
Authors: Kenneth Bisgaard Christensen, Alireza Maheri, and M. Amir Saddiq This study investigates the effects of ambient conditions on cryogenic cooling times for medium-carbon steel pipes, focusing on factors such as air velocity, ambient temperature, and cooling medium for simulations. It aims to validate the viability of cryogenic conditions for low- energy fracturing in carbon steel and explores the efficiency of a proposed cryogenic cooling and cutting system. The research also highlights the importance of insulating effects and discusses the trade-offs between cooling efficiency, costs, and energy consumption.
19 - Practice and prospects for intelligent construction and smart operation of Lancang River Hydropower Projects
Authors: Hongqi Ma, Haibin Xiao This document provides an overview of the development and implementation of intelligent construction and smart operation technologies in the Lancang River Hydropower Project. It summarizes the research, development, and practical applications of these technologies, particularly in the context of high earth–rock and roller compacted concrete dams, and introduces specific technologies and functions related to dam safety, engineering control, disaster prevention, and environmental monitoring.
26 - UK-HSE List of research reports on offshore oil and gas activities
This internet link allows every person interested to access and download the UK HSE research reports. It must be emphasized that the UK HSE has been one of the 1st official bodies to emit guidelines and laws to improve the working conditions offshore and that its impact remains essential.
05 - Development and Application of Offshore Trade Authenticity Verification Platform Based on Blockchain
Authors: Hai-Feng Chen, Lv Zhang, Shuai Wang , Shan- Shan Shi Offshore trade is common in international trade, but its hidden capital flow poses risks. Authenticity verification is crucial for economic security. This paper presents a blockchain-based verification platform that meets user needs and shows good performance. It promotes regional trade, supports financial institutions, and empowers offshore trade development.
06 - A novel design of multifunctional offshore floating platform structure based on topology optimization.
Author: Nouman Saeed, Jingliang Gong, Yuejia Wan, Kai Long, Ayesha Saeed, Liu Mei, Chen Xiong, Wujian Long, Haijun Zhou, Lixiao Li Floating platforms are an affordable choice for gathering energy in deep seawater. Key design concerns are lightweight and structural stability, ensuring they can bear loads. This paper presents a new lightweight offshore platform design that uses density-based topology optimization for wind-solar-wave energy. The design addressed extreme sea conditions and passed strength checks under DNV code standards, achieving a total mass reduction of 40. 82% and improved stiffness and durability.
07 - A Corrosion and Repair-Based Reliability Framework for Offshore Platforms.
Authors: Mehdi Hajinezhadian, and Behrouz Behnam Offshore platforms are critical structures that often experience severe corrosion, which can weaken them over time. Although many anti-corrosion methods exist, a comprehensive management plan is necessary for their long-term operation. This work suggests a corrosion and repair reliability framework for these platforms. It shows that corrosion depth significantly impacts repair effectiveness. The study proposes a corrosion growth model based on various standards to aid platform owners in safety decisions.
08 - Effect of Doping Trace Rare Earth Elements on Corrosion Behavior of EH36 Offshore Platform Steel
Authors: Shujia Zheng, Na Liu, Yang Liu, Xiaoning Wang, Lina Qiu, and Aijun Gong EH36 offshore platform steel, La (0. 0031%), Ce (0. 0027%), and Pr (0. 0001%) steel were studied for corrosion. Immersion experiments showed that rare earth elements reduce corrosion rates. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyzed corrosion products. Electrochemical tests showed rare earths increased charge transfer resistance and decreased corrosion current density. The influence of Cl− concentration and temperature on corrosion rates followed similar trends. Rare earths improved corrosion resistance of EH36 steel.
09 - Optimal design of offshore jacket platform using enhanced colliding bodies optimization algorithm
Authors: Naser Shabakhty, Alireza Asgari Motlagh, Ali Kaveh Jacket platforms use a lot of materials, making their structural optimization important. The design optimization process is complex and slow, so efficient algorithms are needed. This research explores the Enhanced Colliding Bodies Optimization (ECBO) for a jacket platform, SPD19A, comparing it to the Genetic Algorithm (GA). The ECBO method improves the jacket's design by 15%, while GA achieves 11%, showing that ECBO is more effective at avoiding local optima.
10 - A Comparative Study on Hydrodynamic Responses of Floating Offhore Wind Turbine Platforms in Regular Waves.
Authors: Mir Tareque Ali, Md. Shariar Badon Floating Offshore Wind Turbine (FOWT) platforms are crucial for deep-sea conditions. This paper analyzes semisubmersible FOWT platforms in regular waves using Hydrostar software. It calculates wave excitation forces and motion responses in six degrees of freedom. Three base shapescircular, square, and hexagonalare studied, showing minimal impact on hydrodynamic behavior. Results may assist in FOWT design.
11 - Exploring the effects of ambient conditions on the cryogenic cooling times of offshore structures: Towards optimising ustainability and the decommissioning timescale.
Authors: Kenneth Bisgaard Christensen, Alireza Maheri, and M. Amir Saddiq This study looks at how ambient conditions affect cooling times for medium-carbon steel pipes during cryogenic processing, focusing on air velocity, ambient temperature, and cooling medium. Results show increased cooling times with certain conditions, validating cryogenic methods for carbon steel. The research emphasizes the significance of surface area and discusses the balance between cooling efficiency and costs. It aims to support Sustainable Development Goals by promoting eco- friendly cryogenic technologies for offshore structure decommissioning.
12 - Virtual Inertial Control of Small- and Medium-Sized Wind Turbines on Mobile Offshore Platforms with DC Microgrids.
Authors: Ruifang Zhang, Guoling Wang, Zhenyu Li, Fuqiao He, Chenghan Luo, and Wensheng Cao The renewable energy mobile offshore platform uses a mix of renewable energy and energy storage to support marine resource development. Due to the unpredictable nature of renewable energy, a virtual inertia control method for small- and medium-sized wind turbines is proposed to enhance stability. The method uses the wind turbine's mechanical inertia and is verified through experiments on a DC microgrid platform.
16 - Event-Triggered Neural Adaptive Distributed Cooperative Control for the Multi-Tug Towing of Unactuated Offshore Platform with Uncertainties and Unknown Disturbances.
Author: Shaolong Geng, Yulong Tuo, Yuanhui Wang, Zhouhua Peng, and Shasha Wang An event-triggered neural adaptive cooperative control is proposed for a towing system with uncertainties. It uses a neural network to manage disturbances and ensures desired drag force. A mechanism reduces communication needs and thruster frequency. The system's stability is confirmed, and the effectiveness is shown through simulations.
17 - Hydrodynamic performance of a submersible net cage integrated with an offshore platform
Authors: Zhenglin Tian, Hui Yang, and Hongjie Wen The integrated development of offshore platforms and net cages is important in ocean engineering. A composite structure is proposed, combining a submersible net cage with the steel pipe piles of an offshore platform to improve cost-effectiveness and use ocean resources better. A numerical model using OpenFOAM software assesses its hydrodynamic performance. The model is validated and used to study velocity variations and forces on the steel piles at different submerged depths.
20 - Reliability Analysis of a Four-legged Jacket Offshore Platform: A Case Study.
Authors: Hastuti, RW Prastianto, D M rosyid, F Syalsabila, M R Syarifudin Offshore oil and gas exploration needs reliable infrastructure, focusing on structural reliability. Designs often use fixed values, but random factors can vary. This research uses the Monte Carlo method to assess the reliability of a jacket platform in Indonesia, yielding high reliability scores of K = 0. 9883 and K = 0. 9963 for operating and extreme loads, respectively, indicating safety under analyzed conditions.
21 - Benchmark Dataset for Offshore Platform Motion Prediction and Its Applications.
Authors: Wenyin Pan, Xiaoxian Guo, and Xin Li Accurate prediction of offshore platform and ship motion is important for compensation devices and crew decisions. Machine learning models are replacing traditional methods due to simplicity and lower costs, but limited data complicates model training. This paper presents a motion dataset from over 400 offshore platform tests at Shanghai Jiao Tong University, divided for various applications. A new Convolutional Attention- based Long Short-Term Memory model improves motion prediction accuracy by 5–10% compared to classical models, proving the dataset’s reliability and the model's effectiveness.
22 - Optimization Simulation of Mooring System of Floating Offshore Wind Turbine Platform Based on SPH Method
Authors: Weibo Du, Peigang Jiao, Kangning Li, Jiaming Ding This paper utilizes the Smoothed Particle Hydrodynamics method to simulate the dynamic behavior of a floating offshore wind turbine mooring system in a complex marine environment. It introduces single-cable and double-cable systems in the model, using both first-order irregular and second-order regular waves for different conditions. The platform's performance is analyzed, yielding data on velocity and six degrees of freedom changes. The findings show that the optimized double- cable mooring system enhances the platform's vibration reduction capability.
23 - Numerical investigation on hydrodynamic response of a SPAR platform for offshore wind energy.
Authors: Arya Thomas, V.K. Srineash, and Manasa Ranjan Behera COP28 has urged governments to shift from fossil fuels to renewable energy like wind and solar power. This study investigates a SPAR-type Floating Offshore Wind Turbine’s responses under various wave conditions and mooring line setups. It examines how freak waves impact the turbine and analyzes wave-structure interactions using numerical modeling. The findings highlight that taut mooring configurations effectively stabilize the turbine during freak waves, contributing to understanding mooring performance under varying conditions..
24 - Study on the Prediction of Motion Response of Offshore Platforms Based on ResCNN-LSTM.
Authors: Feng Diao, Tianyu Liu, Franck Aurel Likeufack Mdemaya, and Gang Xu In a random sea environment, offshore platforms are affected by wind, waves, and currents, making their motion responses complex. This paper uses STAR-CCM+ to simulate offshore platform motion under regular and irregular waves. A predictive model combining convolutional and long short-term memory neural networks is developed to forecast motion responses, showing high accuracy with R² values over 0. 99 for regular waves and above 0. 4 for irregular waves. The study aims to improve decision-making for offshore platform operations.
27 - Applying Neural Networks to Predict Offshore Platform Dynamics
Authors: Nikolas Martzikos, Carlo Ruzzo, Giovanni Malara, Vincenzo Fiamma, and Felice Arena Integrating renewable energy with aquaculture on floating platforms promotes sustainable offshore infrastructure. A prototype tested in Italy provided insights into structural behavior. The study uses Artificial Neural Networks to predict mooring load changes. Several models were analyzed, achieving a Normalized Root Mean Square Error of 1. 7–4. 7%. Results show machine learning's potential in ocean systems management.
28 - OC6 Phase IV: Validation of CFD Models for Stiesdal TetraSpar Floating Offshore Wind Platform
Authors: Hannah Darling, David P. Schmidt, Shengbai Xie, Jasim Sadique, Arjen Koop, Lu Wang, Will Wiley, Roger Bergua Archeli, Amy Robertson, Thanh Toan Tran Floating offshore wind turbine (FOWT) technology is new and relies on modeling tools for development. The OC6 project aims to verify these tools. The Stiesdal TetraSpar platform was simulated with CFD under OC6 conditions, showing good predictions of wave response but some damping issues due to uncertainties. The study provides insights into achieving reliable results.
29 - Study on Motion Response Prediction of Offshore Platform Based on Multi-Sea State Samples and EMD Algorithm.
Authors: Tianyu Liu, Feng Diao, Wen Yao, Franck Aurel Likeufack Mdemaya, and Gang Xu Offshore platforms must handle changing marine environments, requiring analysis of their motion under various conditions. This study uses STAR-CCM+ software to assess platform responses to different wave directions and heights. The method enhances forecasting of offshore structures' dynamic responses, supporting safer and more productive maritime operations.
30 - Design for additive manufacturing of topologically optimized air manifold
Author: Nikolaos Kladovasilakis Topology optimization is used in mechanical design for lightweight and cost-effective solutions. This study outlines a workflow for redesigning a low-pressure air manifold using advanced design. Iterative finite element analyses removed excess material and improved structural integrity, resulting in a design 76% lighter than the original, costing under €5 per item. This workflow can apply to various 3D-printed mechanical parts in different industries.
31 - Structural Effectiveness of Fixed Offshore Platforms with Respect to Uniform Corrosion.
Authors: Abubakar O. Salihu , Kolawole Abejide, Olugbenga S. Abejide, Jibrin M. Kaura, Ibrahim Aliyu, Kehinde Adeshina, Olugbenga S. Abejide This study evaluates the effectiveness of fixed offshore platforms under complex marine conditions. Using Finite Element Analysis and Monte Carlo’s reliability method, it assesses how corrosion and environmental loads affect structural performance. Results show high stress in beam and column connections. Choosing high-grade steel and larger cross-sections can enhance durability and safety. The findings underscore the need to consider material properties, connections, and loading in design to improve offshore platform reliability.
32 - Effectiveness of deck-isolation and viscous dampers supplement on enhancing seismic performance of offshore jacket platforms
Authors: S. Dashti, K. Tarbali, C. Zhou, J.G. Chase Offshore structures used for oil production are adapting for renewable energy. This study assesses the seismic performance of a typical offshore jacket platform and two modified versions with isolation systems. Ground motion ensembles are selected based on the site’s seismic hazard. Results show significant reductions in displacement, acceleration, and base shear with the application of a specific damper.
33 - Local Structure Optimization Design of Floating Offshore Wind Turbine Platform Based on Response Surface Analysis.
Authors: Yajun Ren, Mingxuan Huang, Jungang Hao, Jiazhi Wang, Shuai Li, Ling Zhu, Haisheng Zhao, and Wei Shi The floating platform is essential for the floating offshore wind turbine (FOWT), with its internal design being crucial for safe operation. The study parameterized the local model, created a response surface model through an orthogonal test, and optimized it using a gradient descent algorithm. Safety calibration confirmed the internal structure arrangement. The optimized model shows a 22. 12% reduction in maximum stress without changing mass and centroid, enhancing safety and offering useful insights for FOWT platform design and construction.
34 - Methodological proposal for satellite communication on offshore self-elevating platform.
Authors: Ricardo A. Barrera Cámara, José R. González - Reda, Alejandro Fuentes-Penna The use of information and communication technologies improves work and communication, but challenges exist in remote areas. The goal is to implement a satellite communication system for offshore platforms using VSAT technology, following a tested methodology.
35 - Multi-Antenna GNSS–Accelerometer Fusion Attitude Correction Algorithm for Offshore Floating Platform Displacement Monitoring.
Authors: Xingguo Gao, Junyi Jiang, Guoyu Xu, Zengliang Chang, and Jichao Yang A new attitude correction algorithm was proposed to improve GNSS displacement monitoring on offshore floating platforms by blending multi-antenna GNSS and an accelerometer using Kalman filtering. The method was tested successfully, enhancing accuracy and compensating for low sampling rates.
36 - Synergic sensing of light and heat emitted by offshore oil and gas platforms in the South China Sea.
Authors: Yujia Qiu, Xiao-Ming Li, Lin Yan, and Zhongzhong Chen The growing demand for oil and gas requires customized monitoring of platforms. Remote sensing is effective, but has limitations. The SDGSAT-1 offers high-resolution imaging and has been used to detect gas flaring at 113 active platforms in the South China Sea.
37 - 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 The 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.
38 - 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.
39 - 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.
40 - 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.
41 - 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.
42 - 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.