Journal of Marine Science and Technology最新文献

Statistical prediction for nonlinear failure function of linear loads: application to plate buckling in ship structure 线性载荷非线性失效函数的统计预测：在船舶结构板材屈曲中的应用

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2024-08-31 DOI: 10.1007/s00773-024-01021-3

Sadaoki Matsui

{"title":"Statistical prediction for nonlinear failure function of linear loads: application to plate buckling in ship structure","authors":"Sadaoki Matsui","doi":"10.1007/s00773-024-01021-3","DOIUrl":"https://doi.org/10.1007/s00773-024-01021-3","url":null,"abstract":"This study presents a practical method for calculating the probability of exceedance (PoE) of the nonlinear failure function of the linear loads randomly fluctuating in irregular waves. In general, obtaining the exact PoE of such nonlinear quantities requires sophisticated computational method that are not well-suited for practical design. In contrast, the author in a previous study proposed a practical formula of the PoE distribution for von Mises stresses by asymptotic approximation, which can be applied when the criterion surface is ellipsoid in the stochastic variable space. Following this, the present study shows a method for calculating the PoE for a more general function of which the isosurface is expressed as a combination of ellipsoids. As a specific example of its application, this paper takes the limit state of the plates in ship structures specified in the common structural rules (CSR) and presents the calculation procedure of direct numerical integration as well as asymptotic approximation approaches. Calculation of the 1/1000 maximum expected value of the evaluation function of plates in short-term sea states using 700 actual plates in a ship structure confirms that the proposed method, which does not require integration, is in good agreement with rigorous methods using numerical integration.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142217957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonlinear steering control law under input magnitude and rate constraints with exponential convergence 具有指数收敛性的输入幅度和速率约束下的非线性转向控制法

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2024-08-28 DOI: 10.1007/s00773-024-01020-4

Rin Suyama, Satoshi Satoh, Atsuo Maki

引用次数: 0

Practical method for evaluating wind influence on autonomous ship operations (2nd report) 评估风对船舶自主运行影响的实用方法（第二次报告）

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2024-08-28 DOI: 10.1007/s00773-024-01025-z

Atsuo Maki, Yuuki Maruyama, Leo Dostal, Kenji Sasa, Ryohei Sawada, Kouki Wakita

{"title":"Practical method for evaluating wind influence on autonomous ship operations (2nd report)","authors":"Atsuo Maki, Yuuki Maruyama, Leo Dostal, Kenji Sasa, Ryohei Sawada, Kouki Wakita","doi":"10.1007/s00773-024-01025-z","DOIUrl":"https://doi.org/10.1007/s00773-024-01025-z","url":null,"abstract":"Recently, a considerable number of research and development projects have focused on automatic vessels. A highly realistic simulator is needed to validate control algorithms for autonomous vessels. For instance, when considering the automatic berthing/unberthing of a vessel, the effect of wind in such low-speed operations cannot be ignored because of the low rudder performance during slow harbor maneuvers. Therefore, a simulator used to validate an automatic berthing/unberthing control algorithm should be able to reproduce the time histories of wind speed and wind direction realistically. Therefore, in our first report on this topic, to obtain the wind speed distribution, we proposed a simple algorithm to generate the time series and distribution of wind speed only from the mean wind speed. However, for wind direction, the spectral distribution could not be determined based on our literature surveys, and hence, a simple method for estimating the coefficients of the stochastic differential equation (SDE) could not be proposed. In this study, we propose a new methodology for generating the time history of wind direction based on the results of Kuwajima et al.’s work. They proposed a regression equation of the standard deviation of wind direction variation for the mean wind speed. In this study, we assumed that the wind direction distribution can be represented by a linear filter as in our previous paper, and its coefficients are derived from Kuwajima’s proposed equation. Then, as in the previous report, the time series of wind speed and wind direction can be calculated easily by analytically solving the one-dimensional SDE. The joint probability density functions of wind speed and wind direction obtained by computing them independently agree well with the measurement results.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142227126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Automatic docking with extended dynamic positioning 自动对接，扩展动态定位

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2024-08-24 DOI: 10.1007/s00773-024-01018-y

Stefan Larsen, Håkon Hagen Helgesen, Jens Emil Walmsness, Giorgio Kwame Minde Kufoalor, Tor Arne Johansen

{"title":"Automatic docking with extended dynamic positioning","authors":"Stefan Larsen, Håkon Hagen Helgesen, Jens Emil Walmsness, Giorgio Kwame Minde Kufoalor, Tor Arne Johansen","doi":"10.1007/s00773-024-01018-y","DOIUrl":"https://doi.org/10.1007/s00773-024-01018-y","url":null,"abstract":"This article presents an automatic docking method suitable for fully actuated surface vessels for the purposes of assisting operators of maritime vessels when docking in time-varying environmental conditions. Docking of ships is a particularly stressful task for human operators, with high demands for both speed and precision, especially under influence from environmental disturbances such as wind, waves and ocean currents. The need for automatic docking systems is increasing as unmanned maritime vessels become more advanced and integrated into global maritime transportation. To address this task, a comprehensive automatic docking algorithm was developed, with path following and velocity control using a modified dynamic positioning control system, which makes the method applicable in existing industrial control systems. In addition, the method includes capability analysis of the docking procedure and evaluates strategies for counteracting disturbances. Specifically, this method utilizes a modified dynamic positioning control system using position sensor data only, to control position, heading and velocity in different stages when docking automatically. The methods are proven in simulations and field experiments.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142217959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effectiveness assessment and simulation of a wearable guiding device for ship evacuation 用于船舶撤离的可穿戴引导装置的效果评估与模拟

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2024-08-21 DOI: 10.1007/s00773-024-01024-0

Luca Braidotti, Serena Bertagna, Vittorio Bucci, Alberto Marino’

{"title":"Effectiveness assessment and simulation of a wearable guiding device for ship evacuation","authors":"Luca Braidotti, Serena Bertagna, Vittorio Bucci, Alberto Marino’","doi":"10.1007/s00773-024-01024-0","DOIUrl":"https://doi.org/10.1007/s00773-024-01024-0","url":null,"abstract":"The evacuation of a modern passenger ship is a challenging task which might be hindered by a complex ship’s internal layout and/or the blocking of escape routes due to fire/flooding. In this work, the application of mobile technology to reduce travel time is investigated. A pilot system has been developed and tested on the RoPax ship GNV Bridge. It is composed of a server and a mobile application running on wearable smartbands. The guidance and localisation of devices have been carried out through Bluetooth beacons. A test area has been identified on GNV Bridge including 2 cabins corridors on deck 6 and the main lounge on deck 5. The corridors and the lounge are connected by three staircases, defining three alternative escape routes starting from cabins and arriving at the muster station in the main lounge. In the trials, the escape routes have been randomly blocked to assess the reduction of travel time achieved providing guidance through wearable devices to a sample population. It resulted in a 16.9% reduction in travel time. Besides, a strategy to simulate with a certified tool the effect of a guiding system has been defined. This is essential to make trials’ results transferable in different environments (e.g., other RoPax or cruise ships). In particular, experimental data coming from the trials have been used to assess agents’ speed reduction rate due to mobile device consultation. Although available experimental data were limited by the pandemic, the 2.5% agent’s speed reduction applicable to simulations has been assessed as most probable.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142217960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The kinetic energy recovery of a buoyancy engine 浮力发动机的动能回收

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2024-08-13 DOI: 10.1007/s00773-024-01017-z

Francisco J. Arias

引用次数: 0

Reproducibility evaluation of detailed directional spectrum based on mean spreading angle for ship performance estimation in actual seas 基于平均展宽角的详细方向谱可重复性评估，用于实际海域中的船舶性能评估

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2024-08-06 DOI: 10.1007/s00773-024-01022-2

Takaaki Hanaki, Naoto Sogihara, Masaru Tsujimoto

{"title":"Reproducibility evaluation of detailed directional spectrum based on mean spreading angle for ship performance estimation in actual seas","authors":"Takaaki Hanaki, Naoto Sogihara, Masaru Tsujimoto","doi":"10.1007/s00773-024-01022-2","DOIUrl":"https://doi.org/10.1007/s00773-024-01022-2","url":null,"abstract":"Ship response in short-crested irregular waves is calculated as the product of the frequency response function of ship response in regular waves and the directional spectrum of waves. However, the commonly used IACS and JONSWAP spectra may not accurately reproduce detailed spectra by wave hindcasting data and wave radar measurements, leading to over- or underestimation of ship responses. This study focuses on the reproducibility of a detailed directional spectrum by standard directional spectrum based on physical considerations concerning the mean spreading angle. This approach facilitates discussion on the limitations of reproducing a detailed directional spectrum with a standard directional spectrum. Furthermore, a procedure is proposed for the use of a standard directional spectrum based on the mean spreading angle as an indicator. Analysis using 6 example ships demonstrates that employing the procedure enables the extraction of highly reproducible and valuable data for short-term prediction of the added resistance in short-crested irregular waves.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141949072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probability density function of roll amplitude for parametric rolling using moment equation 利用力矩方程计算参数滚动的滚动振幅概率密度函数

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2024-07-25 DOI: 10.1007/s00773-024-01006-2

Yuuki Maruyama, Atsuo Maki, Leo Dostal

{"title":"Probability density function of roll amplitude for parametric rolling using moment equation","authors":"Yuuki Maruyama, Atsuo Maki, Leo Dostal","doi":"10.1007/s00773-024-01006-2","DOIUrl":"https://doi.org/10.1007/s00773-024-01006-2","url":null,"abstract":"For the ship stability estimation and ship design, it is helpful to know the probability of the roll amplitude exceeding a certain threshold. Therefore, it is necessary to obtain the probability density function of the roll amplitude. In this study, first, we derive the moment values of roll amplitude by combining the moment equations and the linearity of expectation. With this, we propose a method to estimate the probability density function of the roll amplitude by using the obtained moment values. The results of our proposed method are compared to those obtained from Monte Carlo simulations. When the higher-order cumulant neglect closure method is used, the moment values resulting from the moment equations are close to the results of corresponding Monte Carlo simulations. In addition, our proposed method for deriving the probability density function of the roll amplitude is validated by comparison with Monte Carlo simulation results. In conclusion, we can state that the proposed methods for deriving the moments and the probability density function of the roll amplitude are available for practical use cases.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141771997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on hydrodynamic forces prediction of underwater vehicle based on Co-Kriging model 基于 Co-Kriging 模型的水下航行器流体动力预测研究

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2024-07-25 DOI: 10.1007/s00773-024-01007-1

Bo Qi, Xide Cheng, Kunyu Han

引用次数: 0

Robust control of unmanned sea surface vehicle using inertial delay control 利用惯性延迟控制对无人驾驶海面飞行器进行鲁棒控制

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2024-07-23 DOI: 10.1007/s00773-024-01012-4

Sudam D. Adlinge, Pramod D. Shendge, Dinesh D. Dhadekar

引用次数: 0