A Study to improve the computer program for ship maneuvering motion simulation

本研究以本實驗室(台灣大學工程科學及海洋工程學系 運動與控制實驗室)於1988年根據日本MMG數學模式所建立的深水域操縱運動模擬計算系統為基礎，為擴充流體動力係數估算之選擇，參考引用近期日本貴島勝郎發表的文獻資料(1990年、2006年及2009年)所示之經驗式，進行模擬計算程式系統的更新和擴充。 本文藉由聯合船舶設計發展中心和台灣國際造船公司分別提供的九艘和三艘實船實測數據，進行包含迴旋試驗和Z形試驗的模擬計算與比較，探討依據上述文獻資料更新後的操縱模擬計算程式系統的可用性，結果顯示貴島勝郎2006年所提出考慮艉部稜塊係數和艉部水線面積係數，所發展之線性和非線性阻尼力與阻尼力矩係數經驗式顯著的提升了操船模擬之精度。此外，由於尚未有符合貴島2009年文獻所定義的肥胖船型之實船測試結果，故本研究並未就此進行比較探討，但本研究已將對肥胖型之估算方式寫入程式以供未來研究探討之應用。此外，1996年森正彥所提出預估附加質量與質量慣性矩的回歸式，以及2005年藤原敏文所提出的風力係數預估經驗式都已納入更新後的程式系統，可供後續應用。A computer program to simulate ship maneuvering motions in deep water was developed at the Motion & Control Lab. of ESOE, NTU in 1988, basing on the MMG (Mathematical Modeling Group) model developed in Japan. In the present study, to update the ship maneuvering motion simulation program, recently developed empirical formula for estimating hydrodynamic coefficients by Kijima are adopted and included into the computer program. Sea trial data including turning tests and zig-zag maneuvers of 9 ships offered by USDDC and 3 ships offered by CSBC are used for comparing with the simulation results obtained by the updated computer program. It is confirmed that the empirical formula for estimating linear and nonlinear damping coefficients proposed by Kijima in 2006 improved significantly the accuracy of simulated maneuvering motions. In addition, the empirical formula for estimating the hydrodynamic coefficients of fat ships proposed by Kijima in 2009 are also included in the updated program, although the validation has not been conducted due to the lack of sea trial data of fat ships that meet the definition. Furthermore, the regression formula for estimating the added mass and added moment of inertia proposed by Mori in 1996, as well as the empirical formula for estimating wind force coefficients proposed by Fujihara in 2005, are also included in the updated computer program for ship maneuvering motions simulation