Journal of the Japan Society of Naval Architects and Ocean Engineers最新文献_第5页

A Study of Workload Estimation for Maritime EngineerUsing VACP Method and Heart Rate 基于VACP方法和心率的船舶工作负荷估算研究

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.32.269

Tatsuro Ishida, T. Miwa, Makoto Uchida

引用次数: 0

A Study on Viscous Wave Drift Force on Semi-submersible and Prediction of The Extreme Value of Mooring Force 半潜船粘性波漂移力研究及系泊力极值预测

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.30.59

K. Yukawa, S. Kato

{"title":"A Study on Viscous Wave Drift Force on Semi-submersible and Prediction of The Extreme Value of Mooring Force","authors":"K. Yukawa, S. Kato","doi":"10.2534/jjasnaoe.30.59","DOIUrl":"https://doi.org/10.2534/jjasnaoe.30.59","url":null,"abstract":"In 2012, a mooring line of the semi-submersible “ Deepsea Atlantic ” that had been operating at Gullfaks South Field in the North Sea was broken. A JIP team investigated causes of the accident in Norway and reported that the accident occurred due to the combination of viscous wave drift force and anomalous wave. Until now, potential wave drift force has been used in the mooring design for semi-submersible but viscous wave drift force has not been taken into consideration. Generally, in the frequency band where the wave length is long, the ratio of potential wave drift force is small among wave drift forces acting on the ﬂoating body, while viscous wave drift force becomes dominant. In a structure of which splash zone has a short diameter, such as a column of semi-submersible, the wave length is long compared to the column, and the viscous wave drift force acts remarkably. In this paper, we demonstrated a method for a moored semi-submersible to estimate the viscous wave drift force in irregular waves. Then, the validity of a simulation model was veriﬁed by comparing the result of numerical simulation and the result of model test. In addition, with regard to the safety evaluation of mooring force, we repeated Monte Carlo simulations using the same simulation model, and investigated the inﬂuence of number of samples and duration on the prediction of the extreme value of mooring force using diﬀerent methods for extreme value statistical analysis.","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121758664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Roll Response Model during Maneuvering 机动过程中的滚转响应模型

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.30.49

D. Terada, H. Yasukawa, Y. Yoshimura, M. Matsuda

引用次数: 1

Study on Maneuvering Motion Modeling of Small AUV 小型水下航行器机动运动建模研究

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.32.259

Shunka C. Hirao, T. Fujiwara, Akihiro Okamoto, H. Sekiguchi, Motonobu Imasato, M. Sasano

{"title":"Study on Maneuvering Motion Modeling of Small AUV","authors":"Shunka C. Hirao, T. Fujiwara, Akihiro Okamoto, H. Sekiguchi, Motonobu Imasato, M. Sasano","doi":"10.2534/jjasnaoe.32.259","DOIUrl":"https://doi.org/10.2534/jjasnaoe.32.259","url":null,"abstract":"The maneuvering motion equations of AUVs (Autonomous Underwater Vehicles) are mostly appropriated and constructed from the field measurement on maneuverability in marine engineering. The applicability of the equations of motions applied to the conventional AUVs was confirmed for the NMRI small cruising AUV “mini-AUV” with 1.8m length developed at National Maritime Research Institute (NMRI) in Japan. The motion model is redefined concerning the MMG model which is commonly used in the ship maneuvering modeling field. The model treats a main hull, rudders, and a thrust unit as components for obtaining hydrodynamics terms in the motion equation. Based on the modeled equations, towing tests, etc. were conducted in the test basin of our institute, and the parameters in the equations of motions were determined. Free-running tests of the mini-AUV were also carried out in the basin to confirm the maneuvering performance of the AUV. In this paper, the procedure of maneuvering modeling on the hydrodynamic forces and test results of the modeling forces are introduced. The results of the free-running tests and computational simulations are presented under the same conditions for comparisons. As a result, the simulated results correspond reasonably well with the tank test ones, and then it was shown that the equations of motions on the small AUV presented in this paper are useful for estimating the navigational performance.","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126446185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of Hull Structure and Noise Control Measures for Noise in Accommodation Space 船体结构优化与舱内噪声控制措施

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.30.177

Takumi Ozawa, M. Hirakata, Taiki Tsukada, Sho Suda, S. Abe, Toshiyuki Takahashi

引用次数: 0

Installation of Air Lubrication System for Ro-Pax Ferry and Verification of its Effect in Actual Seas Based on Onboard Measurement Data Ro-Pax轮渡空气润滑系统的安装及基于船上测量数据的实际海上效果验证

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.29.1

S. Mizokami, Ryota Kuroiwa

引用次数: 5

Influence of Grid Resolution and Reynolds Number on Flow around Ship Propeller in Large Scale LES Simulation 大尺度LES模拟中网格分辨率和雷诺数对船舶螺旋桨绕流的影响

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.30.15

Takeharu Fujisawa, M. Tsubokura, Hisao Tanaka

{"title":"Influence of Grid Resolution and Reynolds Number on Flow around Ship Propeller in Large Scale LES Simulation","authors":"Takeharu Fujisawa, M. Tsubokura, Hisao Tanaka","doi":"10.2534/jjasnaoe.30.15","DOIUrl":"https://doi.org/10.2534/jjasnaoe.30.15","url":null,"abstract":"Numerical methods based on CFD (Computational Fluid Dynamics) are rapidly expanding their application range, especially with recent remarkable developments in computer performance. Currently, the RANS (Reynolds average Navier-Stokes equation) model, which is a time-averaged model of turbulent flow, is generally used for ship performance estimation. The estimation accuracy of a turbulence model using numerical methods can be improved by adjusting the model with more accurate and detailed flow field data. However, it is still difficult to obtain detailed flow field data through experiments on actual ships and scale models. In a LES (Large Eddy Simulation) model, which is used to spatially filter turbulent flow, if the grid resolution (filter size) is fine, the limitations imposed by the model itself are reduced. LES simulations performed with a sufficiently grid resolution are known to achieve the same estimation accuracy as DNS (Direct Numerical Simulation) but with a lower computational load. Based on these considerations, as the first attempt at practical estimation of ship performance by numerical calculation considering turbulence, large-scale LES simulations were carried out using “K computer” for a marine propeller in open water. In this paper, the authors show how the grid resolution affects the estimation of propeller performance and flow around the propeller, and the influence of the Reynolds number on the calculation results.","PeriodicalId":192323,"journal":{"name":"Journal of the Japan Society of Naval Architects and Ocean Engineers","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134400639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Static Stability of Plane Side Ship 平面侧船的静稳定性研究

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.30.91

K. Yabushita, Go Okahata

引用次数: 0

Investigation of friction drag change by bubbles using double optic fiber probe 用双光纤探头研究气泡摩擦阻力变化

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.34.37

Takamichi Hiroi, T. Hamada, C. Kawakita

引用次数: 0

Numerical Analysis on Liquefaction of Iron Ore Fines under Rolling Motion of Ships Using Microscopic Fluid Coupling Scheme Devised in Discrete Element Method 用离散元法设计的微观流体耦合方案对船舶滚动运动下铁矿粉液化进行数值分析

Journal of the Japan Society of Naval Architects and Ocean Engineers Pub Date : 1900-01-01 DOI: 10.2534/jjasnaoe.35.87

Y. Shimizu, M. Sugihara, K. Takeda, Wakaba Tsuruta, Tsutomu Fukui

引用次数: 1