{"results":[{"id":"doaj_10.3390/jmse14060529","title":"Influence of Station-to-Station Line Orientation on Sea Current Speed Observation Using Coastal Acoustic Tomography","authors":[{"name":"Wan-Gu Kim"},{"name":"Byoung-Nam Kim"},{"name":"Yohan Chweh"}],"abstract":"The influence of station-to-station line orientation on sea current speed observations using Coastal Acoustic Tomography (CAT) was quantitatively investigated. For this purpose, we conducted CAT experiments at five stations in Yeosu Bay, South Korea. Through these experiments, the sea current speeds were estimated along a total of six tomographic observation lines with different orientations, and the results were compared with current speeds measured simultaneously by an Acoustic Doppler Current Profiler (ADCP). The comparison showed that the concordance between tomography-estimated sea current speed and ADCP-measured sea current speed tended to decrease as the acute angle between the predominant tidal current direction in Yeosu Bay and a tomographic observation line increased. This tendency is interpreted as arising because the smaller the difference between the two one-way travel times obtained during tomographic observations, the greater the effect of the travel time measurement error whose magnitude is relatively direction-independent. This interpretation was supported by a simple numerical simulation. Furthermore, quantitative analysis of these simulation results indicated that a smaller acute angle between the predominant sea current direction in the survey area and a tomographic observation line enhances the robustness of sea current speed estimation against travel time measurement errors. The results show that the station-to-station line in CAT should be arranged considering the predominant sea current direction in the survey area, which can provide an important guideline for selecting station locations.","source":"DOAJ","year":2026,"language":"","subjects":["Naval architecture. Shipbuilding. Marine engineering","Oceanography"],"doi":"10.3390/jmse14060529","url":"https://www.mdpi.com/2077-1312/14/6/529","is_open_access":true,"published_at":"","score":70},{"id":"ss_5a5f38d6718041ecb5c245101204a2c8b321fb32","title":"Testing and Inspection of Offshore and Marine Lifting Appliances","authors":[{"name":"Richard Rossi Ciampolini"},{"name":"A. Olsen"}],"abstract":"","source":"Semantic Scholar","year":2025,"language":"en","subjects":null,"doi":"10.1007/978-3-031-72809-9","url":"https://www.semanticscholar.org/paper/5a5f38d6718041ecb5c245101204a2c8b321fb32","is_open_access":true,"citations":1,"published_at":"","score":69.03},{"id":"doaj_10.3390/jmse13040629","title":"Research on Parameter Influence of Offshore Wind Turbines Based on Measured Data Analysis","authors":[{"name":"Renfei Kuang"},{"name":"Jinhai Zhao"},{"name":"Tuo Zhang"},{"name":"Chengyang Li"}],"abstract":"Offshore wind turbines are prone to structural damage over time due to environmental factors, which increases operational costs and the risk of accidents. Early detection of structural damage through monitoring systems can help reduce maintenance costs. However, under complex external conditions and varying structural parameters, existing methods struggle to accurately and quickly detect damage. Understanding the factors that influence structural health is critical for effective long-term monitoring, as these factors directly affect the accuracy and timeliness of damage identification. This study comprehensively analyzed 5 MW offshore wind turbine measurement data, including constructing a digital twin model, establishing a surrogate model, and performing a sensitivity analysis. For monopile-based turbines, sensors in x and y directions were installed at four heights on the pile foundation and tower. Via Bayesian optimization, the finite element model’s structural parameters were updated to align its modal parameters with sensor data analysis results. The update efficiencies of different objective functions and the impacts of neural network hyperparameters on the surrogate model were examined. The sensitivity of the turbine’s structural parameters to modal parameters was studied. The results showed that the modal flexibility matrix is more effective in iteration. A 128-neuron, double-hidden-layer neural network balanced computational efficiency and accuracy well in the surrogate model for modal analysis. Flange damage and soil degradation near the pile mainly impacted the turbine’s health.","source":"DOAJ","year":2025,"language":"","subjects":["Naval architecture. Shipbuilding. Marine engineering","Oceanography"],"doi":"10.3390/jmse13040629","url":"https://www.mdpi.com/2077-1312/13/4/629","is_open_access":true,"published_at":"","score":69},{"id":"ss_10307c4037ab5cdbc0649177129397436f4c3330","title":"Hydrodynamics of Multi-purpose Coastal and Offshore Structures","authors":[{"name":"Xuanlie Zhao"}],"abstract":"","source":"Semantic Scholar","year":2025,"language":"en","subjects":null,"doi":"10.1007/978-3-031-95465-8","url":"https://www.semanticscholar.org/paper/10307c4037ab5cdbc0649177129397436f4c3330","is_open_access":true,"published_at":"","score":69},{"id":"ss_d2212a2cf8f334aedd12cb1dc25b51148628bf94","title":"Proceedings of the IV Iberoamerican Congress of Naval Engineering and 27th Pan-American Congress of Naval Engineering, Maritime Transportation and Port Engineering (COPINAVAL)","authors":null,"abstract":"","source":"Semantic Scholar","year":2024,"language":"en","subjects":null,"doi":"10.1007/978-3-031-49799-5","url":"https://www.semanticscholar.org/paper/d2212a2cf8f334aedd12cb1dc25b51148628bf94","is_open_access":true,"citations":1,"published_at":"","score":68.03},{"id":"ss_d112f9d3544979f82e7cfd170afb589a43746fbc","title":"Ship Operations in Extreme Low Temperature Environments","authors":[{"name":"A. Olsen"}],"abstract":"","source":"Semantic Scholar","year":2024,"language":"en","subjects":null,"doi":"10.1007/978-3-031-52513-1","url":"https://www.semanticscholar.org/paper/d112f9d3544979f82e7cfd170afb589a43746fbc","is_open_access":true,"citations":1,"published_at":"","score":68.03},{"id":"ss_a887cf49e62c6a0f0a9021575620beb4387bfa50","title":"Dynamic Positioning Systems","authors":[{"name":"Fidaa Karkori"}],"abstract":"","source":"Semantic Scholar","year":2024,"language":"en","subjects":null,"doi":"10.1007/978-3-031-59173-0","url":"https://www.semanticscholar.org/paper/a887cf49e62c6a0f0a9021575620beb4387bfa50","is_open_access":true,"citations":1,"published_at":"","score":68.03},{"id":"doaj_10.3390/jmse12101778","title":"A Risk Identification Method for Ensuring AI-Integrated System Safety for Remotely Controlled Ships with Onboard Seafarers","authors":[{"name":"Changui Lee"},{"name":"Seojeong Lee"}],"abstract":"The maritime sector is increasingly integrating Information and Communication Technology (ICT) and Artificial Intelligence (AI) technologies to enhance safety, environmental protection, and operational efficiency. With the introduction of the MASS Code by the International Maritime Organization (IMO), which regulates Maritime Autonomous Surface Ships (MASS), ensuring the safety of AI-integrated systems on these vessels has become critical. To achieve safe navigation, it is essential to identify potential risks during the system planning stage and design systems that can effectively address these risks. This paper proposes RA4MAIS (Risk Assessment for Maritime Artificial Intelligence Safety), a risk identification method specifically useful for developing AI-integrated maritime systems. RA4MAIS employs a systematic approach to uncover potential risks by considering internal system failures, human interactions, environmental conditions, AI-specific characteristics, and data quality issues. The method provides structured guidance to identify unknown risk situations and supports the development of safety requirements that guide system design and implementation. A case study on an Electronic Chart Display and Information System (ECDIS) with an AI-integrated collision avoidance function demonstrates the applicability of RA4MAIS, highlighting its effectiveness in identifying specific risks related to AI performance and reliability. The proposed method offers a foundational step towards enhancing the safety of software systems, contributing to the safe operation of autonomous ships.","source":"DOAJ","year":2024,"language":"","subjects":["Naval architecture. Shipbuilding. Marine engineering","Oceanography"],"doi":"10.3390/jmse12101778","url":"https://www.mdpi.com/2077-1312/12/10/1778","is_open_access":true,"published_at":"","score":68},{"id":"doaj_10.3390/jmse12122194","title":"Estimation and Characteristics of Low-Frequency Ambient Sea Noise from Far-Field Ships","authors":[{"name":"Xuegang Li"},{"name":"Yang Shi"},{"name":"Cheng Zhao"},{"name":"Guocang Sun"},{"name":"Zhiben Shen"},{"name":"Zihao Zhou"}],"abstract":"To study the rapid estimation method and characteristics of low-frequency ambient sea noise generated by far-field ships, firstly, based on the reciprocity principle of sound fields and the fact that the number of noise sources significantly exceeds the number of receiving array elements, the positions of noise sources and receiving array elements were swapped to effectively reduce the sound field estimates and the running time. Secondly, a vertical directionality analysis method for ambient noise generated by ship noise was derived. And lastly, the ambient sea noise generated by ship noise in the Philippine Sea was estimated and analyzed, and the validity of the estimation method was verified based on measured data in the region. The estimation method presented in this paper can be used to predict the level and directionality of ambient noise generated by ship noise in a large area of sea, and acts as technical support for the meaningful use of sonar arrays in the actual marine environment.","source":"DOAJ","year":2024,"language":"","subjects":["Naval architecture. Shipbuilding. Marine engineering","Oceanography"],"doi":"10.3390/jmse12122194","url":"https://www.mdpi.com/2077-1312/12/12/2194","is_open_access":true,"published_at":"","score":68},{"id":"doaj_10.3390/jmse12081452","title":"Continuous Field Determination and Ecological Risk Assessment of Pb in the Yellow Sea of China","authors":[{"name":"Zhiwei Zhang"},{"name":"Dawei Pan"},{"name":"Yan Liang"},{"name":"Md. Abdur Rahman"},{"name":"Xiaofeng Wang"}],"abstract":"Field determination and ecological risk assessment of dissolved lead (Pb) were performed at two Yellow Sea sites in China using a continuous automated electrochemical system (CAEDS). This CAEDS instrument includes an automatic triple filter sampler and an electrochemical detection water quality analyzer, which might be operated automatically four times daily. The dissolved Pb concentrations varied from 0.29 to 1.57 μg/L in the South Yellow Sea over 16 days and from 0.32 to 2.28 μg/L in the North Yellow Sea over 13 days. During the typhoon and algal bloom periods, the Pb concentration was as high as ten times greater than usual. According to the calculation of contamination factors (C\u003csub\u003ef\u003c/sub\u003e) and subsequent analysis, seawater quality was classified as Grade II. Through species sensitivity distribution (SSD) method experiments and ecological risk analysis, an average risk quotient (RQ) below 1 for both areas was obtained, indicating a low-to-moderate ecological risk. This system will be helpful for Pb monitoring and assessment in seawater and contribute to the biogeochemical cycling study of Pb.","source":"DOAJ","year":2024,"language":"","subjects":["Naval architecture. Shipbuilding. Marine engineering","Oceanography"],"doi":"10.3390/jmse12081452","url":"https://www.mdpi.com/2077-1312/12/8/1452","is_open_access":true,"published_at":"","score":68},{"id":"doaj_10.3390/jmse12060950","title":"Research on Two-Phase Flow and Wear of Inlet Pipe Induced by Fluid Prewhirl in a Centrifugal Pump","authors":[{"name":"Jilong Chen"},{"name":"Xing Chen"},{"name":"Wenjin Li"},{"name":"Yuhai Zheng"},{"name":"Yi Li"}],"abstract":"In deep-sea mining hydraulic lifting systems, centrifugal pumps are very important as power units. In the process of transportation, the fluid prewhirl phenomenon in the impeller inlet will lead to changes in the state of motion of the particles and fluid and cause the wear of the inlet pipe, which can lead to centrifugal pump failure in serious cases. In this paper, a numerical simulation of the centrifugal pump is carried out based on the CFD-DEM coupling method to analyze the influence of the prewhirl on the wear of the inlet pipe. The results show that the velocity streamline near the impeller inlet position changes significantly. The flow field velocity increases along the radial direction of the inlet pipe, and it has a maximum value at \u003ci\u003er/R\u003c/i\u003e = 0.98. The prewhirl flow pulls the particles to change their original motion direction, and the area where the particles are subjected to high fluid force is concentrated between 0.5 \u003ci\u003ed/D\u003c/i\u003e and 1 \u003ci\u003ed/D\u003c/i\u003e, about 0.015 to 0.018 N, resulting in the uneven distribution of particles. The high-wear area appears in the bottom-left area (specifically, L4, L9, and L13), and this is also the location of the largest cumulative force; the high-wear area shows a triangle. The collision energy loss of particles increases due to the influence of the prewhirl, which leads to an increase in wear.","source":"DOAJ","year":2024,"language":"","subjects":["Naval architecture. Shipbuilding. Marine engineering","Oceanography"],"doi":"10.3390/jmse12060950","url":"https://www.mdpi.com/2077-1312/12/6/950","is_open_access":true,"published_at":"","score":68},{"id":"ss_adc5f230a0ef43941fda34c496cfb716df393074","title":"Safety Culture and Leading Indicators for Safety in the Maritime and Offshore Environment","authors":[{"name":"A. Olsen"}],"abstract":"","source":"Semantic Scholar","year":2024,"language":"en","subjects":null,"doi":"10.1007/978-3-031-55943-3","url":"https://www.semanticscholar.org/paper/adc5f230a0ef43941fda34c496cfb716df393074","is_open_access":true,"published_at":"","score":68},{"id":"ss_f114fd6808cf278941f3481d52d8afa8298300ce","title":"Position and Nearshore Mooring","authors":[{"name":"A. Olsen"}],"abstract":"","source":"Semantic Scholar","year":2024,"language":"en","subjects":null,"doi":"10.1007/978-3-031-65675-0","url":"https://www.semanticscholar.org/paper/f114fd6808cf278941f3481d52d8afa8298300ce","is_open_access":true,"published_at":"","score":68},{"id":"ss_6a2e31797e05c42fb0e4ed786461c1fecce22fb5","title":"Introduction to Digital Navigation","authors":[{"name":"A. Olsen"}],"abstract":"","source":"Semantic Scholar","year":2024,"language":"en","subjects":null,"doi":"10.1007/978-3-031-47490-3","url":"https://www.semanticscholar.org/paper/6a2e31797e05c42fb0e4ed786461c1fecce22fb5","is_open_access":true,"published_at":"","score":68},{"id":"ss_cdce47f85ff8b0c7a5496a10933316d4fe406bd2","title":"Containerized Cargo Handling and Stowage","authors":[{"name":"A. Olsen"},{"name":"Fidaa Karkori"}],"abstract":"","source":"Semantic Scholar","year":2024,"language":"en","subjects":null,"doi":"10.1007/978-3-031-63329-4","url":"https://www.semanticscholar.org/paper/cdce47f85ff8b0c7a5496a10933316d4fe406bd2","is_open_access":true,"published_at":"","score":68},{"id":"ss_12c17d9417ef2a55c798c42aa380ed233dca8c65","title":"Path Planning for Automatic Berthing Using Ship-Maneuvering Simulation-Based Deep Reinforcement Learning","authors":[{"name":"A. Vo"},{"name":"Thi Loan Mai"},{"name":"Hyeong-Kyu Yoon"}],"abstract":"Despite receiving much attention from researchers in the field of naval architecture and marine engineering since the early stages of modern shipbuilding, the berthing phase is still one of the biggest challenges in ship maneuvering due to the potential risks involved. Many algorithms have been proposed to solve this problem. This paper proposes a new approach with a path-planning algorithm for automatic berthing tasks using deep reinforcement learning (RL) based on a maneuvering simulation. Unlike the conventional path-planning algorithm using the control theory or an advanced algorithm using deep learning, a state-of-the-art path-planning algorithm based on reinforcement learning automatically learns, explores, and optimizes the path for berthing performance through trial and error. The results of performing the twin delayed deep deterministic policy gradient (TD3) combined with the maneuvering simulation show that the approach can be used to propose a feasible and safe path for high-performing automatic berthing tasks.","source":"Semantic Scholar","year":2023,"language":"en","subjects":null,"doi":"10.3390/app132312731","url":"https://www.semanticscholar.org/paper/12c17d9417ef2a55c798c42aa380ed233dca8c65","pdf_url":"https://www.mdpi.com/2076-3417/13/23/12731/pdf?version=1701101419","is_open_access":true,"citations":13,"published_at":"","score":67.39},{"id":"ss_6acc9b857b042b8ea61b9f1b03c485c194041465","title":"Energy Management of Integrated Energy System in Large Ports","authors":[{"name":"Wentao Huang"},{"name":"Moduo Yu"},{"name":"Hao Li"},{"name":"Nengling Tai"}],"abstract":"","source":"Semantic Scholar","year":2023,"language":"en","subjects":null,"doi":"10.1007/978-981-99-8795-5","url":"https://www.semanticscholar.org/paper/6acc9b857b042b8ea61b9f1b03c485c194041465","is_open_access":true,"citations":8,"published_at":"","score":67.24000000000001},{"id":"ss_32f00d716f0b4d4bb8b523c67cb26e748addee7d","title":"Material and Production Optimization of the Ship Design Process by Introducing CADs from Early Design Stages","authors":[{"name":"Jaime Pérez-Martínez"},{"name":"R. Pérez Fernández"}],"abstract":"Since the introduction of scientific disciplines into the shipbuilding process, there has been a search for optimisation of human and material resources. The current environmental crisis is putting additional pressure on global resource management and special attention to materials sourcing and utilisation. This paper discusses the potential solution for the current lack of effectiveness at early design stages, which are still based on 2D drawings. The industry is demanding a new 3D approach, which implies, first, a change in the procedures, and second, having a suitable CAD/CAM tool for the early generation of a digital mock-up, from which the project is developed throughout all design and production phases, from conceptual design to operation. The proposed solution shown in this paper would improve the general arrangement definition, with the use of CAD for the 3D definition of the compartments and the main equipment positioning; improve the naval architecture calculation; and finally improve the basic/class design stage, with better reuse of data already developed in the general arrangement model and in the definition of a 3D model of structure, with the main equipment positioning, pipes, and electrical equipment already into the model. Intelligent P\u0026I diagrams and single-wire electric diagrams would be used at this stage and connected to the 3D model. Additionally, it will allow for early estimating of materials, weights, and associated processes. This will be further supported by the use of topology to consider design alternatives and produce early information on materials for procurement and production. The cost reduction associated with the definition of the early design stages in 3D has been estimated at around 15% of the overall design and production stages.","source":"Semantic Scholar","year":2023,"language":"en","subjects":null,"doi":"10.3390/jmse11010233","url":"https://www.semanticscholar.org/paper/32f00d716f0b4d4bb8b523c67cb26e748addee7d","pdf_url":"https://www.mdpi.com/2077-1312/11/1/233/pdf?version=1673949515","is_open_access":true,"citations":6,"published_at":"","score":67.18},{"id":"doaj_10.3390/jmse11030548","title":"Development and Control of an Innovative Underwater Vehicle Manipulator System","authors":[{"name":"Xinhui Zheng"},{"name":"Qiyan Tian"},{"name":"Qifeng Zhang"}],"abstract":"Recently, as humans have become increasingly interested in ocean resources, underwater vehicle-manipulator systems (UVMSs) have played an increasingly important role in ocean exploitation. To realize precise operation in underwater narrow spaces, the fly arm underwater vehicle manipulator system (FAUVMS) is proposed with manipulators as its core. However, this system suffers severe dynamic coupling effects due to the combination of small vehicle and big manipulators. To resolve this issue, we propose a robust adaptive controller that contains two parts. In the first part, the extended Kalman filter (EKF) is designed to estimate the system states and predicts external disturbances to achieve adaptive control. In the second part, a chattering-free sliding mode control (SMC) is designed to converge the tracking errors to zero, thus guaranteeing the robustness of the controller. We constructed the simulation platform based on the geometric model of FAUVMS, and various simulations are carried out under different situations. Compared to the traditional methods, the proposed method has a faster convergent speed, a better robustness and adaptiveness to external disturbances, and the tracking errors of positions of the vehicle and each end-effector are much smaller.","source":"DOAJ","year":2023,"language":"","subjects":["Naval architecture. Shipbuilding. Marine engineering","Oceanography"],"doi":"10.3390/jmse11030548","url":"https://www.mdpi.com/2077-1312/11/3/548","is_open_access":true,"published_at":"","score":67},{"id":"doaj_10.4274/jems.2023.89664","title":"Editorial","authors":[{"name":"Selçuk Nas"}],"abstract":"","source":"DOAJ","year":2023,"language":"","subjects":["Naval architecture. Shipbuilding. Marine engineering"],"doi":"10.4274/jems.2023.89664","url":"https://jemsjournal.org/jvi.aspx?un=JEMS-89664\u0026volume=11\u0026issue=1","is_open_access":true,"published_at":"","score":67}],"total":20749,"page":1,"page_size":20,"sources":["DOAJ","Semantic Scholar"],"query":"Naval architecture. Shipbuilding. Marine engineering"}