Volume 6B: Ocean Engineering最新文献_第3页

Comparison of Two Versions of the MNLS With the Full Water Wave Equations 两种具有完整水波方程的MNLS的比较

Volume 6B: Ocean Engineering Pub Date : 2020-08-03 DOI: 10.1115/omae2020-18919

Tianning Tang, Ye Li, H. Bingham, T. Adcock

引用次数: 1

Thruster Performance of an Azimuth Stern Drive Tug 方位船尾驱动拖船的推力器性能

Volume 6B: Ocean Engineering Pub Date : 2020-08-03 DOI: 10.1115/omae2020-19067

L. Yiew, Yuting Jin, Y. Zheng, A. Magee

{"title":"Thruster Performance of an Azimuth Stern Drive Tug","authors":"L. Yiew, Yuting Jin, Y. Zheng, A. Magee","doi":"10.1115/omae2020-19067","DOIUrl":"https://doi.org/10.1115/omae2020-19067","url":null,"abstract":"\u0000 The development of an accurate digital performance twin of a tug requires a complete understanding of its propulsive capacity and hull-thruster interactions. In this study, the propulsion characteristics of an Azimuth Stern Drive (ASD) tug is investigated using model-scale Reynolds-averaged Navier-Stokes (RANS) simulations. The propulsion plant consists of two counter-rotating thruster units, with each having a Ka4-70 series propeller and 19A duct profile. Comparisons in propulsive performances using the steady-state moving reference frame (MRF) approach and the transient rigid body motion (RBM) models are shown, and validated against data from openwater experiments. The MRF method gives sufficiently accurate predictions of thrust and torque in forward flow and moderate angles-of-attack, while the RBM method performs better at larger inflow angles. The effects of thruster-hull and thruster-thruster interactions on wake characteristics and propulsion performance are also investigated over a range of advance and inflow/azimuth angles. Convergence and mesh independence studies are conducted to determine the optimal spatial and temporal simulation parameters. Results from this study identify flow regimes where hull and thruster interactions are significant.","PeriodicalId":431910,"journal":{"name":"Volume 6B: Ocean Engineering","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126355057","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: 1

A 6-DOF Ship-Borne Antenna Platform With Large Orientation Workspace 具有大方位工作空间的六自由度舰载天线平台

Volume 6B: Ocean Engineering Pub Date : 2020-08-03 DOI: 10.1115/omae2020-18024

Yuhang He, Weijia Li, Yaozhong Wu, Jinbo Wu, Zhiyuan Cheng

{"title":"A 6-DOF Ship-Borne Antenna Platform With Large Orientation Workspace","authors":"Yuhang He, Weijia Li, Yaozhong Wu, Jinbo Wu, Zhiyuan Cheng","doi":"10.1115/omae2020-18024","DOIUrl":"https://doi.org/10.1115/omae2020-18024","url":null,"abstract":"\u0000 Compared with traditional antenna platform with two axes, Stewart platform can search airspace with no tracking blind district. And the advantages of high accuracy, high stiffness and high load-weight ratio also make it be a better solution for antenna platforms. This paper designed a 6-DOF ship-borne antenna platform based on the Stewart platform to overcome the difficulties that to realize a large orientation workspace (azimuth range is from 0° to 360°, pitch range is from 0° to 100°) under the compact dimensions of parallel mechanisms. A novel joint structure has been proposed which can provide a larger rotation angle than common Hooke joints to realize the large orientation workspace without the inter-mechanism interference. In addition, this paper defined the concept of working height and working radius then proposed a trajectory based on that to obtain the complete pose (translation and orientation) of antenna platform by azimuth and pitch angles. After that, the particle swarm optimization algorithm is employed to seek the optimal geometrical design parameters. A prototype of the 6-DOF ship-borne antenna platform adopted the particle swarm optimization results has been constructed. And the results show that it not noly meets the design requirements, but also provides a good performance.","PeriodicalId":431910,"journal":{"name":"Volume 6B: Ocean Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132274096","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

Nonlinear and Machine-Learning-Based Station-Keeping Control of an Unmanned Surface Vehicle 基于非线性和机器学习的无人水面车辆站控

Volume 6B: Ocean Engineering Pub Date : 2020-08-03 DOI: 10.1115/omae2020-19276

Armando J. Sinisterra, A. Barker, S. Verma, M. Dhanak

引用次数: 0

Path Following Control of Autonomous Underwater Vehicle Using Nonlinear Model Predictive Control 基于非线性模型预测控制的自主水下航行器路径跟踪控制

Volume 6B: Ocean Engineering Pub Date : 2020-08-03 DOI: 10.1115/omae2020-18241

Tomoki Taniguchi, Jun Umeda, T. Fujiwara, Kangsoo Kim, Takumi Sato, Shogo Inaba

引用次数: 0

Numerical Prediction of Cavitation Performance of Controllable Pitch Propellers With Different Pitch Adjustment Velocities 不同螺距调节速度下可控螺距螺旋桨空化性能的数值预测

Volume 6B: Ocean Engineering Pub Date : 2020-08-03 DOI: 10.1115/omae2020-18548

Yingxian Xue, Xiaoqian Dong, Chen-Jun Yang

{"title":"Numerical Prediction of Cavitation Performance of Controllable Pitch Propellers With Different Pitch Adjustment Velocities","authors":"Yingxian Xue, Xiaoqian Dong, Chen-Jun Yang","doi":"10.1115/omae2020-18548","DOIUrl":"https://doi.org/10.1115/omae2020-18548","url":null,"abstract":"\u0000 The turbulent flow around a cavitating controllable pitch propeller (CPP) is simulated by solving the Reynolds-Averaged Navier-Stokes (RANS) equations, to investigate the dynamic effects on cavitation when the pitch of propeller blades is changed at different pitch adjustment velocities (PAVs). The process of changing the pitch at prescribed PAVs is controlled by a user-defined function (UDF) in the software FLUENT, and during the process, the time-dependent flow domain is re-discretized at each time step with dynamic meshes. The SST k-ω turbulence model and the cavitation model proposed by Schnerr and Sauer are employed in the simulation. The numerical simulation approach is first validated against model experiments for a fixed pitch propeller (FPP) working in the open water. A grid dependence study is carried out to determine a proper mesh resolution for the simulation of such cavitating flows; then the hydrodynamic performance as well as the extent and volume of the sheet cavities obtained from the RANS simulations are compared with experimental data. Then influences of the PAV on the hydrodynamic performance and cavity geometry are investigated. The CPP blades are rotated around the spindle axes to change the pitch, and the movement is controlled by a UDF. The PAV is prescribed and kept constant in the process of adjusting the pitch. At different PAVs, the unsteady thrust and torque, pressure distributions on blade surfaces and propeller disk, cavity geometry, as well as cavitation volume of the cavitating flow are compared with each other to assess the dynamic effects of the PAV.","PeriodicalId":431910,"journal":{"name":"Volume 6B: Ocean Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128728683","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

Design and Testing of AUV Docking Modules for a Renewably Powered Offshore AUV Servicing Platform 可再生动力水下航行器服务平台水下航行器对接模块设计与测试

Volume 6B: Ocean Engineering Pub Date : 2020-08-03 DOI: 10.1115/omae2020-18982

M. Haji, Jimmy Tran, J. Norheim, Olivier L. de Weck

{"title":"Design and Testing of AUV Docking Modules for a Renewably Powered Offshore AUV Servicing Platform","authors":"M. Haji, Jimmy Tran, J. Norheim, Olivier L. de Weck","doi":"10.1115/omae2020-18982","DOIUrl":"https://doi.org/10.1115/omae2020-18982","url":null,"abstract":"Autonomous Underwater Vehicle (AUV) missions are limited in range and duration by the vehicle’s battery capacity, and sensor payloads are limited by the processing power onboard which is also restricted by the vehicle’s battery capacity. Furthermore, the power consumption of a vehicle’s acoustic system limits the possibility of substantial data transmission, requiring the AUV be retrieved to download most data. The Platform for Expanding AUV exploRation to Longer ranges (PEARL), described in this paper, aims to extend the range and endurance of AUVs while reducing data latency and operating costs. PEARL is an integrated autonomous floating servicing station that utilizes renewable energy to simultaneously provide AUV battery recharging and data uplink via new generation high-bandwidth low-Earth orbit satellite constellations. This paper details the design and testing of two potential AUV docking modules of the PEARL system. The modules are uniquely located near the ocean surface, an energetic environment that presents a particular set of challenges for AUV docking. The results will be used to inform the design of a prototype system to be tested in an ocean setting.","PeriodicalId":431910,"journal":{"name":"Volume 6B: Ocean Engineering","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125328165","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: 1

CFD Investigation on the Hydrodynamic Characteristics of Blended Wing Unmanned Underwater Gliders With Emphasis on the Control Surfaces 以操纵面为重点的混流翼水下无人滑翔机水动力特性CFD研究

Volume 6B: Ocean Engineering Pub Date : 2020-08-03 DOI: 10.1115/omae2020-19280

M. Guggilla, V. Rajagopalan

{"title":"CFD Investigation on the Hydrodynamic Characteristics of Blended Wing Unmanned Underwater Gliders With Emphasis on the Control Surfaces","authors":"M. Guggilla, V. Rajagopalan","doi":"10.1115/omae2020-19280","DOIUrl":"https://doi.org/10.1115/omae2020-19280","url":null,"abstract":"\u0000 Underwater Gliders are unique buoyancy propelled oceanographic profiling vehicles. Their speed and endurance in longitudinal motion are affected by the symmetry, sweep dihedral angle and span of the control surfaces. In the low-velocity regime, these parameters can be varied to examine the flow around the glider. They also affect the lift-to-drag ratio (L/D) essential for the manoeuvring path in longitudinal and transverse motions. In this paper, the sweep angle of the main wing of a blended wing autonomous underwater glider configuration is varied as 10°, 15°, 30°, 45° and 60° and the resulting hull forms are numerically simulated in the commercial software, STARCCM+. The main wing is a tapered NACA0018 section (taken as per the general arrangement requirement) with 1.5m chord at the root and 0. 1m at the tip. The numerical model is validated using the CFD results of NACA0012 airfoil from Sun.C et al, 2015 [1]. The hydrodynamic forces are obtained by varying the angle of attack (α) of the body from −15° to 15°, for flow velocity of 0.4m/s. The hydrodynamic coefficients (lift-to-drag ratios) and flow physics around the wing are analyzed to arrive at an optimum Lift-to-drag ratio for increased endurance.","PeriodicalId":431910,"journal":{"name":"Volume 6B: Ocean Engineering","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121996065","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: 4

Monitoring-System Development of Gillnet Using Artificial Neural Network 利用人工神经网络开发刺网监测系统

Volume 6B: Ocean Engineering Pub Date : 2020-08-03 DOI: 10.1115/omae2020-19011

Chungkuk Jin, HanSung Kim, JeongYong Park, Moo-Hyun Kim, Kiseon Kim

引用次数: 0

Stationary Intervals for Random Waves by Functional Clustering of Spectral Densities 基于谱密度泛函聚类的随机波平稳区间

Volume 6B: Ocean Engineering Pub Date : 2020-08-03 DOI: 10.1115/omae2020-19171

D. Rivera-García, L. García-Escudero, A. Mayo-Íscar, J. Ortega

{"title":"Stationary Intervals for Random Waves by Functional Clustering of Spectral Densities","authors":"D. Rivera-García, L. García-Escudero, A. Mayo-Íscar, J. Ortega","doi":"10.1115/omae2020-19171","DOIUrl":"https://doi.org/10.1115/omae2020-19171","url":null,"abstract":"\u0000 A new time series clustering procedure, based on Functional Data Analysis techniques applied to spectral densities, is employed in this work for the detection of stationary intervals in random waves. Long records of wave data are divided into 30-minute or one-hour segments and the spectral density of each interval is estimated by one of the standard methods available. These spectra are regarded as the main characteristic of each 30-minute time series for clustering purposes. The spectra are considered as functional data and, after representation on a spline basis, they are clustered by a mixtures model method based on a truncated Karhunen-Loéve expansion as an approximation to the density function for functional data. The clustering method uses trimming techniques and restrictions on the scatter within groups to reduce the effect of outliers and to prevent the detection of spurious clusters. Simulation examples show that the procedure works well in the presence of noise and the restrictions on the scatter are effective in avoiding the detection of false clusters. Consecutive time intervals clustered together are considered as a single stationary segment of the time series. An application to real wave data is presented.","PeriodicalId":431910,"journal":{"name":"Volume 6B: Ocean Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124690116","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