• Title, Summary, Keyword: Sailing

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Flow Interaction of Sailing Drone using Numerical Method

  • Ngoc, Pham Minh;Choi, Min-Seon;Yang, Changjo
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.230-232
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    • 2019
  • There is an accelerating need for ocean sensing where autonomous vehicles can play a key role in assisting engineers, researcher and scientists with environmental monitoring and collecting oceanographic data. This paper is performed to develops an autonomous sailing drone to be used as a sensor carrying platform for autonomous data acquisition at Sea. From a sailing drone design viewpoint, it is important to establish reliable prediction methods for sailing drone's resistance. The required power for the propulsion unit depends on the ship resistance and speed. There are three solutions for the prediction of ship resistance as follow analytical methods, model tests in tanks and Computational Fluid Dynamics (CFD). The present paper aims at simulating sailing drone friction resistance using numerical method. The dynamic mesh motion is used to describe the sailing drone movement.

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A Study on the Techniques for Sailing Yacht Model Tests with Sailing Condition (항주자세를 고러한 세일링 요트의 선형기법 시험연구)

  • Sim, Sang-Mog;Kim, Dong-Joon;Kang, Byung-Yoon
    • Journal of the Society of Naval Architects of Korea
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    • v.43 no.1
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    • pp.32-42
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    • 2006
  • This study aims at establishing a technique for sailing yachts model tests with sailing condition. It is very important to estimate a ship's potential speed performance before building a real ship. Several methods are used to estimate a ship's potential speed performance such as using parent ship data, standard vessel chart and model test. Model test is the most precise among these options. In korea. model testing is widely used with general vessels but not with sailing yachts. Because sailing yachts are propelled with heeling and leeway. using the wind. another method is needed to estimate their speed. The new model test. which is different from tests for upright general vessels, is in a great demand. In this paper. we describe a test method for the sailing yacht model test. based on Masuyama's equation of motion. And we describe choosing scale ratio. production process and materials of the model. Also. various ways of measuring instruments. attaching jigs and adjusting calibration are described so that they can be utilized as useful data for model testing.

Development of a Generic-YWBS for Engineering Integrated Management of Sailing Yacht (세일링 요트 엔지니어링 통합 관리를 위한 Generic-YWBS 개발)

  • Lee, Dong Kun;Nam, Seung Hoon;Jeong, Yong-Kuk;Shin, Jong-Gye
    • Journal of the Society of Naval Architects of Korea
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    • v.51 no.1
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    • pp.16-25
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    • 2014
  • To develop a sailing yacht successfully, systematic engineering information is required including technologies from various companies and know-how about sailing yacht. The engineering information about sailing yacht has a complex and extensive structure. Therefore, a robust and high-level of management system is needed to manage the information. In this paper, we design and propose Generic-YWBS (Generic-Yacht Work Breakdown Structure), a work breakdown structure for sailing yachts. The Generic-YWBS is aimed at constructing sailing yachts and contains contents about product- and process-oriented information of sailing yachts. In addition, the Generic-YWBS plays an important role in managing the engineering information as a basic schema of database and system architecture. The Generic-YWBS is derived from fundamental WBS design processes and various rules about sailing yachts, for example, ISAF (International Sailing Federation) equipment rule and IRC rating rule, and a generic structure concept is applied for flexibility. The Generic-YWBS is applicable for various purposes. We designed a detailed code system in order to apply the Generic-YWBS to contents management system. The series of activities are realized through a web-based RIA(Rich Internet Application) program. This program manages the YWBS structure in an XML schema, and the Generic-YWBS management application offers a customizing function to be adapted in the field.

Prediction of velocity and attitude of a yacht sailing upwind by computational fluid dynamics

  • Lee, Heebum;Park, Mi Yeon;Park, Sunho;Rhee, Shin Hyung
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.8 no.1
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    • pp.1-12
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    • 2016
  • One of the most important factors in sailing yacht design is accurate velocity prediction. Velocity prediction programs (VPP's) are widely used to predict velocity of sailing yachts. VPP's, which are primarily based on experimental data and experience of long years, however suffer limitations when applied in realistic conditions. Thus, in the present study, a high fidelity velocity prediction method using computational fluid dynamics (CFD) was proposed. Using the developed method, velocity and attitude of a 30 feet sloop yacht, which was developed by Korea Research Institute of Ship and Ocean (KRISO) and termed KORDY30, were predicted in upwind sailing condition.

A Study on the HANSUN Boat Type for Development of Sailing Boat (세일링보트 개발을 위한 한선선형 연구)

  • Park, Gen-Ong;Kim, Dong-Joon
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • pp.53-59
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    • 2003
  • The Study of Hansun(Traditional Fishing Boat of Korea) is based on Fishing Bost Investigation Report which began in 1921. The Report was completed in 1927 with the conclusion of Southern sea Region and Western sea Region studies which included the investigation of the entire region. Based on this report, this paper surveys Hansun's characteristics style of boat and performance. The First couple of chapters are possibility of combining type of Hansun and modern Sailing Boat. As a result we find out that the hull form of Hansun is very similar with that of modern sailing boats and is a good candidate for the mother ship to develop the modern sailing boats for Korean sea.

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A Study on Quantifying Sailing Safety Considering Maneuverability of a Vessel (선박의 조종특성을 고려한 운항안전성능의 수치화 방법에 관한 연구)

  • You, Youngjun;Kim, Sewon;Kim, Woojin
    • Journal of the Society of Naval Architects of Korea
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    • v.54 no.2
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    • pp.113-124
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    • 2017
  • Recently, ship owners are requiring an assessment of sailing safety of a ship from an analysis considering maneuverability and environmental loads etc. In this paper, we propose a new approach to assess sailing safety by considering the prescribed parameters. The concept of sailing safety is developed from DP capability analysis and is based on the maneuvering simulations. While the ship is continuously disturbed due to irregular environmental loads during the simulations, it is steered to keep its course along the way points assumed along a straight path. After relative distances between four edges of the ship and allowable safety boundaries are calculated for 3 hours, the minimum values are obtained. The minimum distances are marked on a polar chart and we call this a quantified safe operation judgment chart which indicates quantified sailing safety.

A Study on the Prediction of Sailing Performance for a LNGC based on the AIS Data (AIS 데이터에 기반한 LNGC의 운항 성능 추정 시뮬레이션 연구)

  • You, Youngjun;Kim, Jaehan;Seo, Min-Guk
    • Journal of the Society of Naval Architects of Korea
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    • v.54 no.4
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    • pp.275-285
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    • 2017
  • In order to predict the sailing performance of a LNGC during actual operation, it is necessary to consider not only the information about resistance, maneuverability etc. but also the information such as sea route and sailing scenario etc., comprehensively. In this paper, we propose a new approach to conduct the sailing simulation of a LNGC without full scale measurement data. Latitude, longitude, sea route, speed over ground, time in UTC obtained from AIS data are substituted for the measured data. By combining the model test results, design information, and AIS data, prediction of sailing performance is conducted from the coast of southern Taiwan to the coast of Madagascar. The simulation is verified by comparing the calculated time histories of RPM and power with those of measured RPM and power.

A Study on the Development of the Safe Navigation Route for a Sailing Yacht Focused on Geomundo (Port Hamilton) (거문도를 중심으로 하는 세일링요트 안전항로 개발에 관한 연구 - 전남 여수 거문도와 제주특별자치도 김녕항 루트를 중심으로 -)

  • Kim, In-Chul;Oh, Hyeon-Jun;Kim, Dong-Won
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.22 no.2
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    • pp.174-180
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    • 2016
  • This study suggests a navigation route for maritime tourism cruise sail yacht that sails off from Yeosu, and passes by Baekdo and Geomundo with their live island culture, to Kimnyeonghang of the Jeju islands. Recently, there are increasing number of accidents in proportion to vitalizing marine leisure. That's why it should be examined by region and sea when developing safe sea route considering characteristics of the sailing yacht. Thus, it is needed to introduce marine culture, hold international sailing yacht race and develop multi-functional sea port according to the case of Geomundo. Also additional analysis for navigation ruote patterns and density of the fairway is required. This information will improve safe sailing level of sailing yacht that will help the local tourism industry.

Performance Predictions for Sailing Yacht by Towing Tests and VPP Calculation (예인수조 시험 및 VPP 계산에 의한 세일링 요트의 성능 추정)

  • Yoo Jae-Hoon;Ahn Hae-Seong
    • Journal of Advanced Marine Engineering and Technology
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    • v.30 no.1
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    • pp.116-124
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    • 2006
  • A model test was carried out, in order to verify the hydrodynamic performances of public 30 feet class sailing yacht. In the initial design stage, the performances and the running attitude of sail yacht including the hull form and sail plan, appendages were estimated by VPP, from which made the representative test conditions. A new experiment system such as captive model device was composed because the running attitude could be changed by wind conditions. The test results show that the minimum resistance is generated in the heeling 20 degree. which was expected in the initial design stage. It is thought to be the useful informations that the keel has an effects on hydrodynamic forces and resistance differences between the upwind and the downwind condition. Also this paper is associated with the state-of-the-art of calculating sailing yacht performance as this is performed in velocity Prediction program (VPP) The VPP results shows a typical shape of a sailing yacht and the designed yacht has the best performance at 120 degree angle of true wind with 20 knots.

A Study on the Ship Resistance and Moment Prediction for Running Attitude of 30 Feet Catamaran Sailing Yacht (30ft급 쌍동형 세일링 요트의 항주자세에 따른 실선저항 및 모멘트 추정에 대한 연구)

  • Park, Chung-Hwan;Jang, Ho-Yun;Jeong, Jin-Wook;Lee, Byung-Sung;Chun, Ho-Hwan
    • Journal of the Society of Naval Architects of Korea
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    • v.47 no.3
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    • pp.321-327
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    • 2010
  • During sailing by wind-driven thrust on the sail, a catamaran sailing yacht generates leeway and heeling. For estimating resistance and moment prediction of a real ship by changing of running attitude, a model test of the ship has to be carried out. This study aims at establishing experimental techniques for a catamaran sailing yacht by changed attitude during running direction. Through the model test, drag and side force of the real ship are predicted. Also through experiment, rolling and yawing moments were considered.