A Numerical Study on the Collision Avoidance of a Container Ship

View Statistics Email Alert RSS Feed

Information

Details

Project title

Code/計畫編號

MOST103-2221-E019-057

Translated Name/計畫中文名

貨櫃船操縱避碰數值研究

Project Coordinator/計畫主持人

Chih-Chung Fang

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Systems Engineering and Naval Architecture

Website

https://www.grb.gov.tw/search/planDetail?id=8351012

Year

2014

Start date/計畫起

01-08-2014

Expected Completion/計畫迄

01-07-2015

Bugetid/研究經費

634千元

ResearchField/研究領域

機械工程
資訊科學--軟體

本計畫研究重點在於建構一套簡化、快速與實用之操船避碰輔助系統。本研究使用國內自主發展之真時操船模擬機(UMS)，建構快速且有效的貨櫃船操縱運動模擬數值評估模式。船舶操縱數值模型採用日本 (MMG,Mathematical Modeling Group)理論，研究選用一艘貨櫃船進行操縱運動數值模擬，藉由實船海試報告來進行船舶數值模型參數之建立與驗證。本研究使用Nomoto所提出的船舶操縱一階線性近似式，探討線性模式中之迴旋性指數(K值)、延遲性指數(T值)與船舶迴旋角速度間之關係，建立K值與T值隨船速與舵角變化的迴歸模型。並以Nomoto一階線性近似式為基礎，建立能預測不同初始船速與不同舵角定迴旋運動下迴旋角速度之數值模型。最後將岩井聰所提出的新航向距離應用於船舶避碰上，配合已建立之K值與T值隨船速與舵角變化的迴歸模型，建立簡化船舶操縱運動數值模型，設計二種船舶避碰佈置實例，分別進行真時與快時數值模擬驗證，此簡化操船模式在船舶遭遇固定障礙物時，能夠很快的計算出最適避碰操舵角度建議值，提供操縱者在面臨操縱決策時能有確切之參考依據，使船舶在操航時更安全且有效率。 A real-time ship simulator, UMS, which is based on the 6-D MMG model will be used for the sea trial simulation of the large container ship to investigate the manoeuvring performance. In order to clarify the validity of the proposed manoeuvrability prediction system, sea trial measured results of the container ship have been compared with the simulation results by the present simulation system. Based on the numerical investigation of turning motion characteristics of the large container ship with varied forward speeds and rudder angles, the first-order linear equation proposed by Nomoto (1956) has been used to investigate the turning characteristics of the large container ship in this study. The effective time constant, T, and the rudder gain, K, can be obtained from the numerical simulations by using the regression technique with varied forward speeds and rudder angles. This simplified manoeuvring model based on the database of manoeuvring parameters is very effective to find the helm angle for ship collision avoidance at seas. Finally, two simulation cases have been used to find the optimal helm angle of the ship and the comparison results are shown with some discussions in this report.

Keyword(s)

操船模擬系統
MMG 理論
流體動力導數
船舶操縱避碰
Real-time ship simulator
MMG model
Hydrodynamic coefficient
ship collision avoidance

DSpace CRIS

A Numerical Study on the Collision Avoidance of a Container Ship

Details

Description